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Agilent 71501D Jitter Analysis System User`s Guide

1. 100 10 2 2 B 1 a 5 3 04 0 01 4 1 1 02 1 03 1 04 1 05 1 06 1 07 Jitter Frequency Hz 83752A Capability 9953 Mb s 100 10 2 2 2 1 5 04 0 01 4 1 02 1 03 1 04 1 05 1 06 1 07 Jitter Frequency Hz Maximum Jitter Minimum Jitter OC 48 Mask STM 16 Mask Maximum Jitter Minimum Jitter OC 192 Mask STM 64 Mask 6 19 Specifications and Characteristics Jitter Modulation Capabilities of 71501D System Configurations 83752A N1015A Capability 2 4 3 2 Gb s 100 _ 10 2 Lr gt Lil Maximum Jitter 3 1 E Minimum Jitter 5 OC 48 Mask E STM 16 Mask 11 a 3 04 0 01 4 1 02 1 E 03 1 E 04 1 05 1 06 1 E 07 1 08 Jitter Frequency Hz 83752A N1015A Capability 9 8 13 Gb s 100 Maximum Jitter Minimum Jitter OC 192 Mask STM 64 Mask Jitter Amplitude UI pp
2. 0 01 4 1 E 02 1 03 1 E 04 1 05 1 06 1 E 07 1 08 Jitter Frequency Hz 6 20 Specifications and Characteristics Jitter Modulation Capabilities of 71501D System Configurations Agilent 70311 Option H08 Clock Source 70311 H 8 Capability 155 Mb s 1000 100 2 10 Maximum Jitter 3 Minimum Jitter ri OC 3 Mask STM 5 1 STM 1 Mask 0 1 0 01 1 01 1 E 02 1 03 1 E 04 1 05 1 E 06 1 07 Jitter Frequency Hz 70311 H 8 Capability 622 Mb s 1000 100 2 10 Maximum Jitter 3 Minimum Jitter OC 12 Mask E 1 STM 4 Mask 0 1 0 01 1 E 01 1 02 1 E 03 1 04 1 05 1 06 1 07 Jitter Frequency Hz 6 21 Specifications and Characteristics Jitter Modulation Capabilities of 71501D System Configurations Jitter Amplitude UI pp 1000 70311 H 8 Capability 2488 M
3. PAGE Setup JITTER TOLERANCE Errars UP TT Pri Freg Status PAGE Trnsfer 1 48 08 Hz 22 588 UI p p PASS DOWN 8 31 88 Hz 22 508 UI p p PASS Jitter 3 188 08 Hz 22 508 UI p p PASS Tolence 4 318 88 Hz 22 508 UI p p PASS 5 1 00 kHz 13 588 UI p p PASS E 3 16 kHz 4 272 UI PASS vier 7 4g gB kHz 2 258 UI p p PASS Generat 31 60 kHz 2 258 UI p p PASS 9 1 00 kHz 2 258 UI p p PASS Output MB 158 8B kHz 1 424 UI p p PASS Jitter di 251 08 kHz UI p p PASS 10 388 8B kHz 565 Ul p p PASS 13 amp 31 8B kHz 357 Ul p p PASS Diagnos 1 1 48 MHz 225 UI p p PASS E Nass prev Storage menu Example of Tabular Results of the Tolerance Test To return to the main tolerance menu press prev menu prev menu Saving the Data To save the calibration data the input template and modifications to the default test parameters so you can use them later insert a formatted RAM card into the card slot of the 70820A and save the data and press Templat Storage If you need to format a card refer to To Initialize format a Memory Card on page 4 42 After the catalog of files is displayed press typing aids Use the alphanumeric typing aids knob and the Select Char function or an external keyboard to enter a filename eight characters maximum and then press ENTER LINE SAVE TEMPLAT 3 30 Tutorials Tutorial 2 Jitter Tolerance M
4. Jitter Transfer Plot 5TH IE 18 m i H J i E 1 o a 5 a E a 8 Luly L Lili 7 lE Modulation Frequency Hz CONT 3 12 Example of a PLOT TRNSFER Function Setup Tolrnce Generat put Jitter Diagnos Nass Storage Tutorials Tutorial 1 Jitter Transfer Measurements Trnsf er Delta LUI Jitter Transfer Data Template 579 16 i mm 4 Aui B lapaa 1 6 Modulation Frequency Example of a PLOT DELTA Function PLOT TRANSFER PLOT DELTA LIST TRANSFER prev menu Several points exceed the transfer specification This is due to the change in both the allowable gain amplitude and the corner frequency 3 13 11 12 18 Tutorials Tutorial 1 Jitter Transfer Measurements PAGE Setup JITTER TRANSFER RESULTS UP res Pt Freg Neas dB Max db Delta dB Status PRGE Trnsfer 1 18 08 Hz H HEH PASS DOWN 8 31 68 Hz 41g BG 18 FAIL Jitter 3 1BB HB Hz 8 8BB B BHB PASS Tolrnce 316 88 Hz 4 008 PASS um 1 8B kHz 918 BG 18 FAIL E 3 16 kHz B18 B BHB 18 FAIL sitter 5 49 08 kHz APA APA FAIL Benerat 34 68 kHz d B
5. 10 2 2 Maximum Jitter E 1 Minimum Jitter OC 48 Mask STM 16 Mask 5 E 5 o 0 01 1 E 01 1 02 1 E 03 1 E 04 1 E 05 1 E 06 1 E 07 Jitter Frequency Hz 6 14 Jitter Amplitude UI pp Specifications and Characteristics Jitter Modulation Capabilities of 71501D System Configurations E4422B N1015A Capability 2 4 3 2 Gb s 100 10 Maximum Jitter 1 EH i Hil Minimum Jitter OC 48 Mask STM 16 Mask 0 1 0 01 4 m 1 E 01 1 E 02 1 E 03 1 04 1 05 1 06 1 E 07 1 08 Jitter Frequency Hz 6 15 Specifications and Characteristics Jitter Modulation Capabilities of 71501D System Configurations Agilent 70340 Clock Source 70340 Capability 2488 Mb s 100 10 a 2 Maximum Jitter 3 i Minimum Jitter 1 OC 48 Mask A STM 16 Mask 5 gt 04 0 01 1 E 01 1 E 02 1 6 03 1 E 04 1 6405 1 06 1 07 Jitter Frequency Hz 70340 Capability 9953 Mb s 100 10 Maximum Jitter Mini
6. Date Time 2002 02 04 11 01 53 DLRITY clk a p NORMINU dat i p LKEDGE clk i p POS NEG AT I P gating ELAY are more laf iof 2 Clk Data Aligned Eye Width 382 8 ps The Main Result Menu of the 70842A B To adjust the pattern generator settings press the left side Address Map softkey Use the front panel knob to scroll the box to the column where the 70841A B or 70843A B appears d Press ADJUST ROW and rotate the knob to move the box to the row where the 70841A B appears e Press ASSIGN BOTH f Use the displayed softkey menus or the MENU key to set the pattern gen erator to the desired settings 2 50 select pattern edit usr pat err add trg o p clk o p nisc patgen HP 78841B PATTERN GENERATOR Pattern Trigger Pattern 000000 Data Normal Status Installation Step 6 Select Template and Measurement Conditions PRBS 247 1 Trigger Mode CLOCK 32 Internal Clock Freq Data 800 0 aV Clock 500 0 aV Data Output ON HI Lv 6 008 V B 8B Status Screen of the 70841A B 2 u8B 320 000 Hz Atten Tern B A dB ay 8 8 dB ay s Optimize DATA REV B 5 POLRITY NORMINU DRTR ECL DRTR RMPLTD DATA HI LEVL DAT 0 P DELAY DAT 0 ON OFF fore 1 of 2 g The error detector and pattern generator displays can be displayed simulta neously by pressing DISPLAY and then the right side NEXT INSTR soft key
7. JITTE Setup Nett 2 97BHB us 997 4 mU ph pk 1 9972 SPECTRA itter Freg 18 Jitter T a AA JITTE Trnsfer WRUEFRH e AUTRES ERE a Tolrnce V V 1 V SPECTRR i Jitter 1 CLOCK Generat A A A LA If A ni WAVEF RM ut put L JITTER nae AA V WAYA v V JITTER Te 200 565 pszdiv WPL Tra Cha TrH Cht Mass mU div 200 mU div RUTDIRG Starage H V ref H V ref H OFF 1 7 Introduction Analysis with the Agilent 71501D 1 8 Installation Chapter Contents NOTE Installation Introduction Introduction In this chapter you ll install the hardware and software and begin to learn about the measurement process For more detailed procedures on the specific measurement applications refer to Chapter 3 Tutorials Introduction 2 2 Jitter System Configurations 2 2 Clock Source Considerations 2 3 Optional N1015A Modulation Test 2 3 Supported Instrument Cables and Accessories 2 7 Step 1 Inspect the Shipment 2 11 Step 2 Install N1015A Optional 2 12 Step 3 Set Up the Equipment with an N1015A 2 16 Step 3 Set Up the Equipment without an N1015A 2 30 Step 4 Set the MSIB and GPIB addresses 2 48 Step 5 Load the Personality 2 45 Step 6 Select Template and Measurement Conditions 2 49 To perform a system calibration 2 52 To use two MMS displays 2 54 To rack mount the 71501D 2 54 Returning the Instrument for Service 2 55
8. CAUTION CAUTION CAUTION Installation Step 3 Set Up the Equipment with an N1015A Step 3 Set Up the Equipment with an N1015A If you do not plan to use an N1015A modulation test set with your system skip this step and continue with Step 3 Set Up the Equipment without an N1015A on page 2 30 The N1015A modulation test set adds the range of 2 4 to 3 2 GHz with 20 MHz modulation 71501D options 300 305 or 9 8 to 13 GHz with 80 MHz modulation 71501D options 310 305 Connect the test equipment using the diagrams referred to in one of the follow ing four setups Jitter Transfer and Generation Measurements Modular clock source and error performance analyzer See Test Setup 2 1 on page 2 17 e Stand alone clock source and error performance analyzer See Test Setup 2 2 on page 2 20 Jitter Tolerance Measurements Modular clock source and error performance analyzer See Test Setup 2 3 on page 2 24 e Stand alone clock source and error performance analyzer See Test Setup 2 4 on page 2 27 To prevent damage to the 70820A microwave transition analyzer always have either a bandpass filter or a dc block connected to the analyzer input channels To avoid damage do not exceed 10 dBm input power or 2 V DC to any N1015A front panel RF inputs Do not apply DC voltage exceeding 10V to the N1015A Jitter Modulation Input The N1015A circuitry can be damaged by electrostatic discharge ESD Avoid
9. a ERROR is returned if Param is outside the listed value range a PROG N SS lt lt lt um SEE 5 5 Omoomomoooc m 20 lt 20 lt UMB Param 75 a PROG STR Command OUTSWEEPS a PROG WAIT A a PROG STR Response Response a PROG STAT CONT a PROG WAIT AS a PROG STAT CONT 5 23 Example Programming Programming PAUSE The PAUSE command enables or disables a jitter application pause just before each measurement of jitter transfer or jitter tolerance When the application pauses it has set up the clock source and sinusoidal jitter modulation Any clock source phase transients have already occurred Either the user or the remote program can ensure the device being tested has properly recovered from any phase transient To continue the jitter application to continue with the measurement press the CONT key or send the PROG STAT CONT command When PAUSE is ON the remote program can check the value of Response obtained after the first PROG WAIT command If the value is PAUSE send PRG STAT CONT when ready If the value is DONE read the measurement results from Rpts Values of Program Variables Variable Data Type Value Command string PAUSE Param string ON OFF Response string DONE or ERROR a ERROR is returned if Param is not ON or OFF IM Rpts 1 28 1 4 Status 10 R
10. MTA Mainframe MSIB OUT rear panel TO PG amp ED Mainframe MSIB IN rear panel PG amp ED Mainframe MSIB OUT rear panel TO MTA Mainframe MSIB IN rear panel Configuration with 3 MMS Mainframes MTA Mainframe MSIB OUT rear panel TO PG Mainframe MSIB IN rear panel PG Mainframe MSIB OUT rear panel TO ED or Clk Source Mainframe MSIB IN rear panel ED or Clk Source Mainframe MSIB OUT rear panel TO MTA Mainframe MSIB IN rear panel a For 83752A only connect a 50 ohm termination in paral b The GPIB connections can be made in any order The on el using a BNC tee to the rear panel FM INPUT y requirement is that all GPIB instruments are interconnected 2 36 Installation Step 3 Set Up the Equipment without an N1015A Test Setup 2 7 Jitter Tolerance Connections with Modular Error Per formance Analyzer and Clock Source MICROWAVE TRANSITION DISPLAY ANALYZER Rear Sync In BANDPASS Data In PATTERN GENERATOR DETECTOR Recovered Clock Out Data Out JITTER CLOCK MODULATION SOURCE Ba C0000 e m HE oco ggg oo 200000 manm 2 ooooo 5555 a Rear Sync Out FM Modulation Input tolmms 1 The 70841A B and 70842A B are the modular error performance analyzers compati
11. GPIB and MSIB If more than one clock source is present such as a modular clock source and an external clock source you can select the one to be used Press CONT to return to the Template Storage menu 4 37 Reference Memory Cards Disks and RAM Memory Cards Disks and RAM This section documents features available with the 70820A menus To access these menus press MENU If the eye diagram analyzer personality or jitter analyzer personality is loaded you can return to the eye diagram or jitter menus by pressing USER The 70820A menus provide the ability to store data as files on the following media Memory cards e GPIB disk drive e Internal random access memory RAM disk Learning how to manage this memory is essential to obtaining the most benefit from your system Memory cards are inserted into the front panel card slot RAM disks can be used as temporary storage for copying the contents of one memory card to another memory card The following list shows the types of data that can be saved as files traces measurement states histograms masks limit lines calibrations user corrections user menus downloadable programs DLPs jitter template and calibration files 4 38 RAM Disks Reference Memory Cards Disks and RAM Selecting and Formatting Memory When first turned on the microwave transition analyzer module automatically selects the memory card as the mass storage device Yo
12. TO GPIB INTERCONNECT rear panel Microwave Transition Analyzer 10 MHz RF OUT rear panel 0 Clock Source 10 MHz REF IN rear panel Microwave Transition Analyzer GPIB rear panel TO GPIB INTERCONNECT rear panel Pattern Generator DATA OUT TO DUT DATA IN Pattern Generator CLOCK OUT through BP filter TO Microwave Transition Analyzer CH 2 Pattern Generator Stand Alone GPIB rear panel TO GPIB INTERCONNECT rear panel DUT DATA OUT TO Error Detector DATA IN DUT CLOCK OUT TO Error Detector CLOCK IN Configuration with 2 MMS Mainframes MTA Mainframe MSIB OUT rear panel TO PG amp ED Mainframe MSIB IN rear panel PG amp ED Mainframe MSIB OUT rear panel TO MTA Mainframe MSIB IN rear panel Configuration with 3 MMS Mainframes MTA Mainframe MSIB OUT rear panel TO PG Mainframe MSIB IN rear panel PG Mainframe MSIB OUT rear panel TO ED or CIk Source Mainframe MSIB IN rear panel ED or CIk Source Mainframe MSIB OUT rear panel TO MTA Mainframe MSIB IN rear panel a For 83752A only connect a 50 ohm termination in paral b The GPIB connections can be made in any order The on el using a BNC tee to the rear panel FM INPUT y requirement is that all GPIB instruments are interconnected 2 42 Installation Step 4 Set the MSIB and GPIB addresses Ste
13. 70820A Input Channel Specifications 6 3 N1015A Specifications 6 4 Jitter Characteristics 6 6 Jitter Modulation Capabilities of 71501D System Configurations 6 9 Declaration of Conformity 6 23 e distinction between specifications characteristics typical performance and nominal values is described as follows Specifications describe warranted performance over the temperature range 0 C to 55 C unless otherwise noted All specifications apply after the in strument s temperature has been stabilized after 1 hour continuous opera tion and self calibration routines have been run Unless otherwise noted corrected limits are given when specifications are subject to minimization with error correction routines Characteristics provide useful but nonwarranted information about the functions and performance of the instrument Characteristics are printed in italics Typical Performance where listed is not warranted but indicates performance which most units will exhibit Nominal Value indicates the expected but not warranted value of the param eter 6 2 Specifications and Characteristics 70820A Input Channel Specifications 70820A Input Channel Specifications CAUTION Input channels RF INPUT 1 and RF INPUT 2 are dc coupled Operation input range lt 320 mV including dc offset Maximum safe input voltage 2 V without damage Number of input channels 2 nput connectors 2 4 mm male omina
14. WARNING WARNING Instrument Markings wo N Installation Step 2 Install N1015A Optional If this product is not used as specified the protection provided by the equipment could be impaired This product must be used in a normal condition in which all means for protection are intact only To prevent electrical shock disconnect the Agilent Technologies model N1015A from mains before cleaning Use a dry cloth or one slightly dampened with water to clean the external case parts Do not attempt to clean internally The instruction documentation symbol The product is marked with this A warning symbol when it is necessary for the user to refer to the instruc tions in the manual The AC symbol is used to indicate the required nature of the line mod ule input power ON OFF The ON STANDBY OFF Push Switch IN and Push Switch OUT symbols The ON and OFF symbols are used to mark the functions associated with the posi tions of an instrument LINE switch The On and STANDBY symbols are used to mark the functions associated with the positions os an instrument POWER switch The Push Switch IN and Push Switch OUT symbols are used in con junction with the ON and OFF or STANDBY symbols to mark the functions associated with the position of a two position push type LINE or POWER switch The CSA mark is a registered trademark of the Canadian Standards Association The C Tick mark is a registered trademark
15. a ERROR is returned if Param is outside the listed value range IPUT IPUT TER M TPUT TER M TPUT TPUT TER M TPUT a PROG NUMB Param 15 5 a PROG STR Command OUTFC1 a PROG WAIT AS a PROG STR Response Response a PROG STAT CONT a PROG WAIT AS a PROG STAT CONT gt OMODOMOMMlOdeO Ecce ECC 5 20 Programming Programming OUTFC2 The OUTFC2 command string sets the second measurement s high pass cor ner frequency for the jitter output measurement Values of Program Variables Variable Data Type Value Command string OUTFC2 Param floating point number 10 Hz to 4 5 MHz 10 to 4 5E6 Hz Response string DONE or ERROR a ERROR is returned if Param is outside the listed value range PUT Mta PROG NUMB Param 15 5 Mta PROG STR Command OUTFC2 PUT Mta PROG WAIT TER Mta A PUT Mta PROG STR Response TER Mta Response TPUT Mta PROG STAT CONT TPUT Mta PROG WAIT TER Mta A TPUT Mta PROG STAT CONT Example Ccrmoocmornccoc czcczczccc a 5 21 NOTE Programming Programming OUTPUT The OUTPUT command initiates an output jitter measurement consisting of two measurements of RMS and peak to peak jitter using the two high pass cutoff frequencies previously set by the OUTFC1 and OUTFC2 commands
16. Jitter System Configurations For specifications and installation cautions and warnings on all instruments in the system except for the N1015A refer to the individual instrument manuals The Agilent 71500A and Agilent 70820A products have been designed and tested in accordance with the standards listed on the Manufacturer s Declara tion of Conformity and has been supplied in a safe condition This documenta tion contains information and warnings that must be followed by the user to ensure safe operation and to maintain the product in a safe condition 2 2 WARNING CAUTION Installation Introduction If this product is not used as specified the protection provided by the equipment could be impaired This product must be used in a normal condition in which all means for protection are intact only Altitude up to 2000 Meters temperature 0 to 40 C Total input signal power to the 70820A module s front panel RF INPUT connectors must not exceed 16 dBm Because there is no RF input attenuator power in excess of 16 dBm may damage the instrument The largest measurable power level before signal compression is 4 dBm There must be only one of the following instruments modulation source microwave transition analyzer pattern generator optionally error detector optionally N1015A modulation test set optionally There must be at least one of the following instruments e display mainframe clock sou
17. Rpts floating point array of 28 see below rows and 4 columns a ERROR is returned if an input template has not been specified Refer to TEMPLATE and CUSTOM commands Result is Rpts array For each frequency in the template four values are sent jitter frequency in Hz jitter amplitude in unit intervals peak to peak modulation synthesizer output voltage peak to peak calibration result flag where 1 cal ok 1 failed value didn t converge in five iterations 99 measurement error algorithm failure such as divide by zero 512 z jitter amplitude was changed due to hardware limitations UI Adjust To clear an incorrect UI Adjust load a different template and then reload the desired template and calibrate the input 5 9 Programming Programming Example TPUT Mta PROG STR Command CALINP T Mta PROG WAIT TER Mta A TPUT Mta PROG STR Response TER Mta Response TPUT Mta PROG NUMB Rpts int 1 to 28 Must ENTER all 28 rows of 4 values ta USING K Jitfreq Jitampl Volts Flag ta PROG STAT CONT ta PROG WAIT ta A ta PROG STAT CONT In this example the values are converted from character string to floating point numbers as they are received A program might instead read every thing into one long string variable and then extract the individual values The values are sent 19 characters per value such as 1 27778184201E 002 sep
18. Step 5 Load the Personality 2 45 Step 6 Select Template and Measurement Conditions 2 49 To perform a system calibration 2 52 To rack mount the 71501D 2 54 To use two MMS displays 2 54 Returning the Instrument for Service 2 55 Tutorials Tutorial 1 Jitter Transfer Measurements 3 3 Tutorial 2 Jitter Tolerance Measurements 3 17 Tutorial 3 Jitter Generation and Output 3 32 Tutorial 4 Diagnostic Measurements 3 39 Troubleshooting the Jitter Analyzer System 3 49 Reference Menu Maps 4 3 Jitter Measurements 4 8 Analyzer System Configuration and Setup 4 17 Calibrating the Analyzer 4 27 Memory Cards Disks and RAM 4 38 Print or Plot Measurement Results 4 49 Programming Specifications and Characteristics 70820A Input Channel Specifications 6 3 N1015A Specifications 6 4 Contents 1 Contents Jitter Characteristics 6 6 Jitter Modulation Capabilities of 71501D System Configurations 6 9 Contents 2 Introduction Introduction Analysis with the Agilent 71501D Analysis with the Agilent 71501D The Agilent 71501D jitter analysis system provides advanced analysis of high speed digital communication waveforms and the components which generate them The jitter analyzer configuration performs automatic compliance and network equipment testing to SONET SDH and custom standards In addi tion it can perform diagnostic measurements of the jitter spectrum and wave form The Agilent 71501D consists of the foll
19. lt 1 MHz is Recommended Maximum Input Random Jitter Levels for Valid Measurement 50 kHz 0C 192 f Setting 040 Peak Peak for Components gt 1 MHz 400 kHz frequency UI Peak Peak for Components Below 1 MHz Maximum Valid Jitter Reading 10 UI Peak Peak 6 7 Specifications and Characteristics Jitter Characteristics Measurement Accuracy Total Error Limit R of Reading W R is Variable Error and W is Fixed Baseline Error valid for f setting lt 1 MHz Variable Error R 7 lt 1 MHz 10 1 MHz to 3 MHz 15 3 MHz to 10 MHz 20 gt 10 MHz Fixed Baseline Error W Bit Rate Fixed Error P P Fixed Error rms Sensitivity Mode 9953 Mb s 0 02 UI 0 002 UI High 9953 Mb s 0 06 UI 0 008 UI Normal 2488 Mb s 0 02 UI 0 002 UI Normal 622 Mb s 0 02 UI 0 002 UI Normal 155 Mb s 0 02 UI 0 002 UI Normal N1015 Modulation Capabilities 2 4 GHz 3 2 GHz 0 5 UI 9 8 GHz 13 GHz Characteristic Operating Range 1 3 GHz lt f 3 4 GHz revision 0 01 20 and above 9 5 GHz lt f lt 13 7 GHz revision 0 01 20 and above 2 0 GHz lt f 3 3 GHz 9 8 GHz lt lt 13 GHz 6 8 Specifications and Characteristics Jitter Modulation Capabilities of 71501D System Configurations Jitter Modulation Capabilities of 71501D System Configurations Agilent 83732B Clock Source 83732B Capability 155 Mb s Jitter Amplitude UI pp 1 01 1 E 02 1 03 1 04 1 0
20. pots ch std 1 3 i Hs 1H na div pane prev Bof P menu Example of Calibration Data Viewing the IF Calibration Data Traces The ability to view the IF calibration data is mainly intended for service pur poses Display the Traces menu by pressing MENU Traces Turn on both trace 1 and trace 2 Set the input to trace 1 as channel 1 Set the input to trace 2 as channel 2 Display the IF correction data for each channel by pressing page 1 of 2 Calib IF calib cal debug show SHOW COR FFT or SHOW COR FIR Scale the traces by pressing page 2 of 2 Scale 4 38 Reference Calibrating the Analyzer 5 Select trace 1 and press AUTOSCALE 6 Select trace 2 and press AUTOSCALE Channel 1 data Measure F Table E _________ __ E CHL CAL Analyze E INFO Jene cat Calib INFO States 1 1 1 Hz 883 25 kHz div 8 03254 MHz Tri zChi Tr2 Che page 4 dB div 1 3 dB div prev 2 af 2 11 0 dB ref dB ref menu Channel 2 data Example of IF Calibration Data Traces Hardware Response Traces 1 Display the traces menu by pressing MENU Traces 2 Turn on both trace 1 and trace 2 Set the input to trace 1 as channel 1 Set the input to trace 2 to channel 2 3 Display the 100 kHz filter response of stage 0 by pressing page 1 of 2 Calib IF cal b cal debug show SHOW CAL 4 Scale the trace
21. 5432 1 16 8 4 2 1 Figure 2 3 N1015A Rear Panel with GPIB address set to 9 2 5 Installation Introduction qg652d Figure 2 4 N1015A Power Line Module 2 6 Installation Introduction Supported Instrument Cables and Accessories Table 2 1 Jitter System Configurations 1 of 2 Microwave Transition Analyzer Frequency Range 70820A microwave transition analyzer module option UF3 expanded memory DC 40 GHz Display Mainframe 70004A color display and mainframe Jitter Personality Card Jitter Modulation Frequency Range 332504 function arb waveform generator 80 MHz 3325A B synthesizer function generator OBSOLETE 20 MHz 3324A synthesizer function generator OBSOLETE 20 MHz Modulation Test Set Frequency Range N1015A Option 300 20 MHz modulator 2 4 3 2 GHz Option 310 80 MHz modulator 9 8 13 GHz Option 305 20 MHz and 80 MHz modulators 2 4 3 2 and 9 8 13 GHz Clock Source Frequency Range E4422B RF signal generator 250 kHz 4 GHz 83752 synthesized microwave sweeper 10 MHz 20 GHz 83732B synthesized signal generator 10 MHz 20 GHz 70340A modular signal generator 1 GHz 20 GHz 83732A synthesized signal generator OBSOLETE 10 MHz 20 GHz 70311A Option H08 modular signal generator with modulation input OBSOLETE 16 MHz 3 1 GHz Error Performance Analyzer Data Rate 2 7 Installation Introduction Table 2 1 Jitter System Configurations 2 of 2 S
22. CONT Example of a Display Showing a New Gain Amplitude 9 Return to the trace display by pressing Cont 10 NOTE Tutorials Tutorial 1 Jitter Transfer Measurements View the Results of Jitter Transfer Display the results of the last transfer measurement and the results menu by pressing trnsfer results For each modulation frequency the pass fail decision is based either on the transfer specification value or the 71501D measurement floor 35 dB below 2 5 MHz modulation frequency 20 dB above 2 5 MHz whichever is greater The 20 dB measurement floor appears as a horizontal yellow line in the jitter transfer plot The templates in the PLOT DELTA and LIST TRNSFER displays also reflect the measurement floor The data can be viewed three ways PLOT TRNSFER displays the measured jitter transfer function and the selected transfer specification template in a graphical mode The plot created using the Plot Transfer function is the same as the plot created using the Mea sure Transfer function PLOT DELTA plots the deviation between the jitter transfer function and the current output template specification LIST TRNSFER displays a numeric list of the jitter transfer function values measured during the jitter transfer measurement including transfer function test limit values the margin between the transfer data and the transfer speci fication limit and the pass fail status
23. Jitter Measurements Jitter transfer measurement accuracy is enhanced if signal harmonic content is suppressed Therefore low pass or bandpass filters are typically used in the measurement paths Refer to Bandpass Filters on page 4 19 The results of the jitter transfer measurement can be displayed in one of three ways e Transfer plot Delta plot e Numerical listing The transfer plot mode shows the jitter transfer function is displayed on a 10 dB division scale usually against the SDH SONET specification line The delta plot mode shows the results as the difference between actual per formance and specified performance For example if the maximum allowable value of the jitter transfer is 0 1 dB and the actual performance is 0 dB the delta plot will show this as being a value of 0 1 dB as it is 0 1 dB below or within specification In the delta plot the vertical scale is 2 dB division pre senting a much higher resolution display than the transfer plot The numerical listing shows a listing of the jitter transfer measurement results The measured response the maximum allowed response the differ ence between actual and specified performance and a pass fail status are all listed The Agilent 71501D jitter analysis system has a two channel simultaneous measurement technique Therefore system drift is common to both channels and is not a significant factor in the measurement Jitter transfer measure ment uncertainty i
24. PROG STAT CONT a gs ggz gt eee 5 18 Programming Programming NOTE Example OUTCLOCKFREQ The OUTCLOCKFREQ command string sets the clock rate for the output of the device under test if it is different from the input clock rate of the device under test Values of Program Variables Variable Data Type Value Command string OUTCLOCKFREQ Param floating point number 100E5 to 40E9 Hz Response string DONE or ERROR a ERROR is returned if Param is outside the listed value range If the 71501D is not operating in the MUX DEMUX mode you must set the input clock and the o SS lt lt lt a PROG WA um EE LI ze Response a PROG WAIT Omoomomooo a 20 1 m n 1 Zoe a PROG STAT CONT AS a PROG STAT CONT utput clock to the same frequencies a PROG NUMB Param 2 48832E9 8 PROG STR Command OUTCLOCKFREQ IT AS a PROG STR Response 5 19 Example Programming Programming OUTFCI The OUTFC1 command string sets the first measurement s high pass corner frequency for the jitter output measurement Values of Program Variables Variable Data Type Value Command string OUTFC1 Param floating point number 10 Hz to 4 5 MHz 10 to 4 5E6 Hz Response string DONE or ERROR
25. Reference jitter_transfer What you will learn in this tutorial Configure the equipment and set up a measurement e Perform a calibration e Perform a jitter transfer measurement Combine measurement traces through averaging e Change the corner frequency of the test specification e Change the gain amplitude of the test specification e Plot the measurement results e Measure jitter transfer on regenerators that do not have clock signal out puts 3 3 NOTE NOTE CAUTION Tutorials Tutorial 1 Jitter Transfer Measurements Step 1 Configure the Equipment The equipment connections are the same for jitter transfer and jitter generation measurements Connect the front and rear panel cables in the configuration that matches the device test frequency and your system equipment Refer to Jitter System Configurations on page 2 2 for a list of 71501D system equipment Determine if the device test frequency is within the following ranges e 2 4 to 3 2 GHz with 20 MHz modulation 71501D options 300 305 e 9 8 to 13 GHz with 80 MHz modulation 71501D options 310 305 If the device test frequency is within the ranges listed above use a configura tion that includes the N1015A modulation test set For stand alone error performance analyzers 70843A B C and 86130A connect the test equipment as shown in Test Setup 2 2 on page 2 20 For modular error performance analyzers 70841A B an
26. Step 2 Set Up the Measurement Conditions on page 3 35 to see how you can set the gating time for the following situations Default gating value for all measurements e Specific gating value for a single measurement Gating time is calculated as follows Gating Time number of errors BER Data Rate If you want to measure at least 100 errored bits and the data rate is 2488 Mbits s and the BER threshold is 1 10 9 then number of errors _ 100 40 2 seconds BER Data Rate 1 10 9 2488 x 106 Gate Time The gating time is set on the error detector Use the tolerance options GATING TIME key to set the default gating time The value set will be used for all jitter tolerance measurements until the value is changed or until the program is restarted To change the gating time for a single measurement across a template without affecting the default use the procedure described below Change the Default Gating Time Each time a jitter tolerance measurement begins the error detector gating time is set to the default value which is initially one second Set the default gating time by pressing tolrnce options GATING TIME To change the gating time for the current measurement without changing the default use the refer to Perform Clock and Data Alignment and Set the Gat ing Time on page 3 23 4 18 Reference Jitter Measurements Jitter Generation and Output Jitter Jitter gener
27. Then press MENU more 1 of 2 Show modules SHOW PAT GEN select pattern select Page dat_o p err add trg op clk o p dat i p clk i p gating more laf HP ERROR DETECTOR Nain Results 8 17 Errar Count mE Delta Errar Count Errar Ratin esas Delta Errar Ratio B B3Be HB Clock Frequency 2 4893 GHz Power Loss Secands i Sunc Logs Seconds Prio aie Time 2002 02 4 11 13 B1 HP HBH1B PATTERN GENERATOR Status 1 181 lata Normal Error Add ie B Pattern PRBS p P3 1 Trigger Pattern Trigger PRTTERM Internal Clack Freg 2 IdB 32B HE Hz fing Hi Lyvl Atten Term Data mU H BHH A A dB HV Clock 500 0 mU 250 8 m A d8 Bu Data Dutput ON Delay HB s Optimize DATA LRITY MINY h Press DISPLAY and then NEXT INSTR to return control to the jitter ana lyzer i Press USER to return to the jitter analyzer personality menus 3 Perform a system calibration as shown in To perform a system calibration on page 2 52 2 51 CAUTION Installation To perform a system calibration To perform a system calibration System calibration should be performed before making jitter transfer and jitter tolerance tests or whenever a new standard or custom template is selected The calibration procedure sets the output voltage swing of the synthesized function sweep generator at given jitter rate
28. Values of Program Variables Variable Data Type Value Command string OUTPUT Param There are no parameters for this command Response string DONE or ABORT Rnoise floating point array of see below seven values a ABORTed if user presses EXIT key during measurement Measurement time is dependent on the device under test and the sensitivity mode used The result is Rnoise a seven value one dimensional numeric array First high pass filter cutoff frequency peak to peak jitter unit intervals RMS jitter unit intervals high pass filter cutoff frequency Second high pass filter cutoff frequency peak to peak jitter unit intervals RMS jitter unit intervals high pass filter cutoff frequency sensitivity flag O normal 1 high 5 22 Example Example m m ES 20 22 S ER PUT Mta PROG N 1107 TER Mta USING DOSZezoeoe 20 EE a PROG STR Command OUTPUT a PROG WAIT PUT Mta PROG STR Response Response UMB Rnoise K Valuef l a PROG STAT CONT a PROG WAIT AS PUT Mta PROG STAT CONT Programming Programming OUTSWEEPS The OUTSWEEPS command string sets the number of output jitter sweeps Values of Program Variables Variable Data Type Value Command string OUTSWEEPS Param floating point number 1 to 1000 example 75 Response string DONE or ERROR
29. 1 18 ABA BA 22 5904 18 27 11 34 MRA 12 44 488 13 58 Ba 14 64 ba 15 79 588 15 98 1 434 942 211 312 211 302 211 312 211 394 295 384 285 Ecce noo ET 22225 Example Custom Template after Calibration 4 23 To Use Different Input Output Data Rates 1 NOTE Reference Analyzer System Configuration and Setup If requested jitter levels lie outside system capabilities either too high or too low the analyzer will force the jitter level template values to be within sys tem capabilities Refer to Specifications and Characteristics on page 6 1 for additional information After creating a template perform a calibration to ensure the desired levels are being achieved Save the template and calibration information Refer to To Save a File on page 4 46 If the device input data rate and output data rate are different you must set the analyzer in the MUX DEMUX mode by pressing Setup MUX DMX ON OFF ON OUTrate OUTclk FREQ data rate The OUTclk FREQ softkey allows you to enter any non standard clock rate for the output of the DUT The output data rate is not limited by the clock source instrument frequency range but may be an
30. 30 template creating and editing 4 21 different input output rates 4 24 load previously saved template 4 21 saving 4 22 selection 2 49 TEMPLATE command 5 29 template storage menu map 4 7 template clock capability 2 52 test set options 2 7 test set modulation 2 7 time domain measurement 3 45 time gating 4 13 tolerance devices without recovered clock output 3 31 jitter 1 6 margin test 3 25 measurement 3 23 measurement results 3 29 menu map 4 5 searching description 4 12 single point test 3 27 TOLERANCE command 5 30 TOLMODE command 5 32 TOLSEARCHFACTOR command 5 33 TOLSEARCHFLAG command 5 34 TRANSFER 5 36 transfer configure equipment 3 4 custom specification 4 26 description 4 9 measurement 3 8 measurement uncertainties 4 10 menu map 4 4 mode 1 5 plot description 4 10 results 3 12 tutorial 3 3 TRANSFER command 5 35 TRANSFER_FC command 5 36 troubleshooting checklist 3 49 turning off RF correction 4 30 tutorial jitter generation and output 3 32 tutorials diagnostic measurement 3 39 jitter 3 2 tolerance 3 17 transfer 3 3 U UI ADJUST 5 9 uncertainties 4 10 uncertainties and accuracies 4 13 USER key 1 3 4 3 V variables to pass commands and data 5 3 verifying clock spectra 3 52 clock wavefrm 3 52 jitter spectra 3 49 jitter wavefrm 3 51 jittered clock signals 3 49 version of program 4 37 viewing calibration data 4 32 clock spectrum 3 46 c
31. 4 output jitter 4 6 setup 4 8 template storage 4 7 messages 4 28 microwave transition analyzer 2 7 modulation jitter 2 7 modulation test set 2 7 modulator error detector 3 22 MUX DEMUX 3 16 N N1015A modulation test set 2 7 number of sweeps adjustment 3 38 numerical listing description 4 10 O options 300 2 7 305 2 7 310 2 7 test set 2 7 OUTCLOCKFREQ command 5 19 Index 4 OUTFC1 command 5 20 OUTFC2 command 5 21 output and generation tutorial 3 32 OUTPUT command 5 22 output jitter description 4 14 generation 4 14 sensitivity modes 4 15 output jitter menu map 4 6 output template adjustment 3 9 output mode 1 6 OUTSWEEPS command 5 23 P packaging for shipment 2 56 pass commands 5 3 passband characteristics 4 20 PAUSE command 5 24 performing a self test 4 35 personality jitter 2 7 personality loading 2 45 PLOT DELTA function 3 13 PLOT TRNSFER function 3 13 plotting measurement results 4 50 prefixes of files 4 45 previously saved template 4 21 print or plot measurement results 4 49 printing measurement results 4 49 PROG STR to read response 5 4 WAIT alternative 5 5 program version 4 37 programming commands 5 2 Q QUIT command 5 25 R RAM disks selecting and formatting 4 39 recalling a file 4 47 reconfiguring and rescanning equipment 4 19 reference 4 2 regenerators measured 3 15 Index REMOTEGATESEC command 5 26 rescan equipment
32. 4 19 response traces of hardware 4 34 results jitter generation 3 38 jitter transfer 3 12 printing and plotting 4 49 tolerance test 3 29 RF correction 4 30 S sales and service offices 2 55 SAVE_TEMPLATE command 5 27 saving a file 4 46 cataloging files 4 46 data 3 14 templates 4 22 the data 3 30 search factor 3 27 SEARCH key 3 26 select template 2 49 selecting and formatting memory 4 39 self test 4 35 Sending an GPIB general device clear 5 5 sensitivity measurement conditions 3 37 sensitivity modes 4 15 service 2 55 sales and service offices 2 55 setting data pattern 3 22 setup menu 4 3 shipping procedure 2 56 signal flow generation and output 3 32 jitter tolerance 3 17 jitter transfer 3 3 single point jitter tolerance test 3 27 single point testing description 4 12 SKIPPED calibration message 2 52 spectra jitter 3 43 spectrum clock 3 46 stand alone error performance analyzer 3 22 storage battery for memory card 4 42 Index 5 Index catalog files 4 46 changing file prefix 4 48 duplicating memory cards 4 43 erasing a file 4 47 file prefixes 4 45 file saving 4 46 GPIB disk drives 4 40 internal RAM 4 39 measurement setup and results 4 45 memory cards and disks and RAM 4 38 menu map 4 7 recalling a file 4 47 selecting and formatting memory 4 39 sweeps adjustment 3 38 system calibration 4 27 system instruments 2 2 2 7 T tabular results 3
33. 70820A press USER Templat Storage VERSION amp CONFIG The list of instruments in the current configuration is displayed on the screen Press RE CONFIG to rescan the GPIB and MSIB instruments Press CONT to return to the main menu Bandpass Filters Narrow bandpass filters are generally used at each of the microwave transition analyzer inputs The filters establish the upper frequency limit on the mea surement band for jitter generation and output jitter and attenuate noise har monics and other spurious signals which might interfere with sinusoidal jitter measurement Both jitter tolerance and jitter transfer measurement benefit from the presence of these filters Bandpass filters are available for 155 Mb s 622 Mb s 2488 Mb s 2666 Mb s 9953 Mb s 10 66423 Gb s 10 7092 Gb s and 12 4416 Gb s Low pass filters are available for 800 MHz 1 5 GHz 4 0 GHz and 12 4 GHz 4 19 Reference Analyzer System Configuration and Setup Filter Characteristics Pass bandwidth 0 8 of center frequency Passband ripple 0 1 dB max Passband flatness 0 5 dB max Passband return loss 20 dB min Insertion loss lt 3 dB typically 1 5 dB Stopband attenuation 20 dB farther than 1 696 of center frequency from center gt 30 dB farther than 2 4 of center frequency from center to DC on the low frequency side to at least 3 times center frequency on high frequency side If you use purchased filters when performing tests with sign
34. 83752A only connect a 50 ohm termination in paral y requirement is that all GPIB instruments are interconnected el using a BNC tee to the rear panel FM INPUT 2 29 CAUTION CAUTION Installation Step 3 Set Up the Equipment without an N1015A Step 3 Set Up the Equipment without an N1015A If you have an N1015A modulation test set skip this step and continue with Step 4 Set the MSIB and GPIB addresses on page 2 43 Connect the test equipment using the diagrams referred to in one of the follow ing four setups Jitter Transfer and Generation Measurements Modular clock source and error performance analyzer See Test Setup 2 5 on page 2 31 e Stand alone clock source and error performance analyzer See Test Setup 2 6 on page 2 34 Jitter Tolerance Measurements Modular clock source and error performance analyzer See Test Setup 2 7 on page 2 37 e Stand alone clock source and error performance analyzer See Test Setup 2 8 on page 2 40 To prevent damage to the 70820A microwave transition analyzer always have either a bandpass filter or a dc block connected to the analyzer input channels All GPIB and MSIB connections must be made prior to turning on the system Connect the GPIB cables in any arrangement as long as all of the instruments are interconnected Connect the MSIB cables to the instruments in a closed loop fashion You can install the MMS modules in multiple mainframe configuration
35. BBB 78 FAIL 9 1BB HB kHz 290 BG 498 FAIL Output 118 158 08 kHz ABA BG ABA FAIL Jitter 111 251 08 kHz ABA BG BG FAIL 12 388 8B kHz 090 98 FAIL 13 631 08 kHz A34 B BHB PASS Diagnos 14 1 AA MHz 154 0 88 154 PASS g Mass prev Starage menu Example of a LIST TRNSFER Function Saving the Data You can save the calibration data the input template and modifications to the default test parameters so you can reuse them later This calibration data is only valid for the specific signal generator and synthesizer function generator on which the calibration was performed To save the template and its associated calibration information insert a formatted RAM card into the card slot of the 70820A and press Templat Storage If you need to format a RAM card refer to To Initialize format a Memory Card on page 4 42 After the catalog of files is displayed press typing aids Use the alphanumeric typing aids knob and Select Char function or an external keyboard to enter a filename eight characters maximum and then press ENTER LINE gt SAVE TEMPLAT For a list of the parameters that are saved as part of the template refer to SAVE TEMPLATE on page 5 27 3 14 Tutorials Tutorial 1 Jitter Transfer Measurements Measure Jitter Transfer on Regenerators that Do Not Have Clock Signal Outputs The process of data regeneration typically requires clock recov
36. Card on page 4 41 to select the memory card for use 2 Insert the memory card with the files into the front panel card slot 3 Press USER If the eye diagram analyzer personality is loaded press USER twice Use a keyboard to enter the following Instrument BASIC commands These commands initialize a RAM disk and copy the files from the card to the RAM 4 43 Reference Memory Cards Disks and RAM disk If you don t have a keyboard Instrument BASIC has an editor for creating these commands INITIALIZE MEMORY 0 0 WILDCARDS DOS COPY TO 0 0 Remove the card from the card slot and insert a blank formatted card in the slot Issue the following Instrument BASIC command to copy the files from the RAM disk to the new card COPY 0 0 TO EXTERNAL 904 4 44 Reference Memory Cards Disks and RAM Measurement Setup and Results Storage Files are identified by a prefix and a name The eye diagram analyzer assigns a prefix according to the type of data as shown in the following table You enter the file name When cataloged the file listings show the file s data type and size in bytes File Prefixes File Type File Prefix Calibration data e Histograms h_ Instrument registers r Instrument state S Mask Limit line m Program d Trace t User corrections a User menu k_ Jitter template T Filenames You can create additional prefix text for your file names The tex
37. IN rear panel rear panel Microwave Transition Analyzer GPIB rear panel TO GPIB INTERCONNECT rear panel Pattern Generator DATA OUT TO DUT DATA IN Pattern Generator CLOCK OUT through BP filter TO Microwave Transition Analyzer CH 2 Pattern Generator Stand Alone GPIB rear panel TO GPIB INTERCONNECT rear panel DUT DATA OUT TO Error Detector DATA IN DUT CLOCK OUT TO Error Detector CLOCK IN Configuration with 2 MMS Mainframes MTA Mainframe MSIB OUT rear panel TO PG amp ED Mainframe MSIB IN rear panel PG amp ED Mainframe MSIB OUT rear panel TO MTA Mainframe MSIB IN rear panel Configuration with 3 MMS Mainframes MTA Mainframe MSIB OUT rear panel TO PG Mainframe MSIB IN rear panel PG Mainframe MSIB OUT rear panel TO ED or CIk Source Mainframe MSIB IN rear panel ED or CIk Source Mainframe MSIB OUT rear TO MTA Mainframe MSIB IN rear panel a For 83752A only connect a 50 ohm termination in paral b The GPIB connections can be made in any order The on el using a BNC tee to the rear panel FM INPUT y requirement is that all GPIB instruments are interconnected 2 39 Installation Step 3 Set Up the Equipment without an N1015A Test Setup 2 8 Jitter Tolerance Connections wth Stand Alone Error Performance Analyzer and Stand Alone Clock Source JITTER MODULATION MICROWAVE TRANSITION ANALYZER DISPLAY o 000000 BANDPASS FI
38. Mask STM 16 Mask 6 17 Specifications and Characteristics Jitter Modulation Capabilities of 71501D System Configurations Agilent 83752 Clock Source 83752A Capability 155 Mb s 100 10 S 2 I Maximum Jitter E nE TI 7 Minimum Jitter s x OC 3 Mask E STM 1 Mask 5 04 0 01 4 1 01 1 02 1 03 1 04 1 05 1 E 06 1 07 Jitter Frequency Hz 83752A Capability 622 Mb s 100 4 10 amp 2 Maximum Jitter E 1 Minimum Jitter OC 12 Mask STM 4 Mask E 5 0 1 0 01 1 1 E 01 1 02 1 03 1 044 1 05 1 06 1 E 07 Jitter Frequency Hz 6 18 Specifications and Characteristics Jitter Modulation Capabilities of 71501D System Configurations 83752A Capability 2488 Mb s
39. PERFORMANCE ANALYZER CLOCK SOURCE JITTER MODULATION combertr 2 35 Installation Step 3 Set Up the Equipment without an N1015A Table 2 12 Jitter Transfer and Generation Measurements with no Test Set Make This Instrument Connection TO This Instrument Jitter Modulation SYNC OUT TO Microwave Transition Analyzer SYNC IN rear panel Jitter Modulation SIGNAL OUTPUT TO Clock Source FM IN EXT 1 INPUT front panel for E4422B Jitter Modulation GPIB rear panel TO GPIB INTERCONNECT rear panel Clock Source Stand Alone RF OUTPUT Clock Source Modular CLOCK OUT 0 Pattern Generator CLOCK IN Clock Source 10 MHz REF OUT rear panel TO Jitter Modulation 10 MHz REF IN rear panel Clock Source Stand Alone GPIB rear panel TO GPIB INTERCONNECT rear panel Microwave Transition Analyzer 10 MHz RF OUT rear panel 0 Clock Source 10 MHz REF IN rear panel Microwave Transition Analyzer GPIB rear panel U TO GPIB INTERCONNECT rear panel Pattern Generator CLOCK OUT through BP filter TO Microwave Transition Analyzer CH 2 Pattern Generator DATA OUT TO DUT Data In DUT Clock Out TO Microwave Transition Analyzer CH 1 through filter Pattern Generator Stand Alone GPIB rear panel U TO GPIB INTERCONNECT rear panel Configuration with 2 MMS Mainframes
40. PG Mainframe MSIB IN rear panel PG Mainframe MSIB OUT rear panel TO ED or CIk Source Mainframe MSIB IN rear panel ED or CIk Source Mainframe MSIB OUT rear TO MTA Mainframe MSIB IN rear panel a For 83752A only connect a 50 ohm termination in paral b The GPIB connections can be made in any order The on el using a BNC tee to the rear panel FM INPUT y requirement is that all GPIB instruments are interconnected 2 38 Installation Step 3 Set Up the Equipment without an N1015A Test Setup 2 6 Jitter Transfer and Generation Connections with Stand Alone Error Performance Analyzer and Stand Alone Clock Source JITTER MODULATION BANDPASS MICROWAVE PIETERS TRANSITION BEC signal DISPLAY ANALYZER OBBEBBE 3 Sync Out Ch1 f Rear Sync In a ee Recovered Clock Out FES DUT Clock Out coo E c Data Out Se c eu seem ERROR uer PERFORMANCE CLOCK SOURCE ANALYZER fs nummum eeng Rear ooo oo 000000 FM In L1 oooooo Wann RF Out If you are using an 83752 clock source connect a BNC tee and a 50 ohm termination to the rear panel FM IN 1 The 70843A B C and 86130A stand alone error performance analyzers are compatible with the 71501D 2 34 Installation Step 3 Set Up the Equipment without an N1015A MICROWAVE 10 MHz Ref Output TRANSITION ANALYZER Rear Sync In
41. Program Variables Variable Data Type Value Command string GENSWEEPS Param floating point number 1 to 1000 Response string DONE or ERROR a ERROR is returned if Param is outside the listed value range TPUT TPUT TPUT TER M TPUT TER M TPUT TPUT TER M TPUT a PROG NUMB Param 10 a PROG STR Command GENSWEEPS a PROG WAIT AS a PROG STR Response Response a PROG STAT CONT a PROG WAIT AS a PROG STAT CONT gt 7z lt INCLOCKFREQ The INCLOCKFREQ command string sets the clock rate for the input of the device under test Standard clock rates are set when a standard input tem plate is selected Values of Program Variables Variable Data Type Value Command string INCLOCKFREO Param floating point number see below Response string DONE or ERROR 5 14 NOTE Example Programming Programming a The jitter application allows use of the 70841 70842 and 70843 down to 1 MHz to accommodate specially ordered instruments which can operate with some performance degradation below 100 MHz b ERROR is returned if Param is outside the acceptable value range If the 71501D is not operating in the MUX DEMUX mode you must set the input clock and the output clock to the same frequencies The lowest acceptable Param value is the highest
42. This Instrument Connection TO This Instrument Jitter Modulation SYNC OUT TO Microwave Transition Analyzer SYNC IN rear panel Jitter Modulation SIGNAL TO Test Set JITTER MODULATION IN Jitter Modulation GPIB rear panel TO GPIB INTERCONNECT rear panel Clock Source RF OUTPUT stand alone 0 Test Set IN 2 5 Gb s or 10 Gb s Clock Source CLOCK OUT modular Clock Source 10 MHz REF OUT rear panel TO Jitter Modulation 10 MHz REF IN rear panel Clock Source GPIB rear panel TO GPIB INTERCONNECT rear panel Microwave Transition Analyzer 10 MHz RF OUT 10 Clock Source 10 MHz REF IN rear panel rear panel Microwave Transition Analyzer GPIB rear panel TO GPIB INTERCONNECT rear panel 2 18 Installation Step 3 Set Up the Equipment with an N1015A Table 2 7 Jitter Transfer and Generation with the Modulation Test Set Make This Instrument Connection TO This Instrument Pattern Generator CLOCK OUT through BP filter TO Microwave Transition Analyzer CH 2 Pattern Generator DATA OUT TO DUT Data In DUT Clock Out TO Test Set DUT OUT Pattern Generator Stand Alone GPIB rear panel TO GPIB INTERCONNECT rear panel Test Set JITTER MODULATION OUT TO Clock Source FM IN EXT 1 INPUT front panel for E4422B Test Set CH1 MTA through filter TO Microwave Transition Analyzer 1 9 8 13 Gb s operation Test Set OUT 2 5 Gb s or 10 Gb s TO Patter Generator CLOC
43. a Template 1 2 3 To Create a Custom Template 1 Reference Analyzer System Configuration and Setup Use the front panel knob or step keys to highlight the desired file then press LOAD TEMPLAT The highlighted file and any associated calibration data and test parameters will be loaded Insert a formatted memory card into the card slot of the 70820A Refer to To Initialize format a Memory Card on page 4 42 Save the template and any associated calibration data by pressing USER Templat Storage typing aids Use the alpha numeric typing aids knob and SELECT CHAR function or an external keyboard to enter a filename eight characters maximum and then press ENTER LINE SAVE TEMPLAT To identify jitter analyzer files the prefix T is added to the eight character filename To modify a standard template select the template to be modified by pressing Setup INtmplt OC 192 OC 48 OC 12 OC 3 or sdh edit template The selected template values are displayed in two data columns The left column displays the frequency points to be tested The right column displays the jitter test levels for each frequency point To modify a value first select it by pressing Select Use the knob or step keys to highlight the value to be modified The numeric keypad can also be used to select a value to be modified The integer portion specifies the row number Afractional part less than 0 5 selects the jitter frequenc
44. application automatically sets the 70820A sampling rate for a useful display if possible When device input and output frequencies differ if the higher one is an integer multiple of the lower one Clock Waveform will show correspondingly more cycles of the higher frequency one The displayed modulation waveform may be distorted if the appropriate band pass filter is not used or if the jitter amplitude is excessive nt on 11 981 us 353 8E 3 JITTER Setup MP t P B8 BH8 us 997 4E 3 pk pk 1 9970 SET ALIA IAT A p Jitter JITTER Trasfer WAVEF RM MET i CLOCK Tolrnce 8 V Vt V SPECTRR o mox EI P JITTER Jitter It Diagnos T Vt V V JITTER Ts 5 155 us div MPL 1 0 47 TrHzT3 DCLT Mass 558E 3 div 55B8E 3 div RUTDIRG Starage ref H ref ON OFF View the Jitter Waveform 12 Measure the peak to peak amplitude of the jitter by pressing MENU 1 of 2 Measure Msr Tr Select TR4 for CHANNEL 1 and TR2 for CHANNEL 2 13 Perform the measurement by pressing 3 45 14 NOTE Tutorials Tutorial 4 Diagnostic Measurements More 3 3 PK PK View the Clock Spectrum To view the frequency spectrum of the jittered clock signal press CLOCK SPECTRA The displayed frequency scale is centered around the clock frequency In MUX DEMUX mode when input and
45. applying static discharge to the N1015A RF connectors and jitter modulation connectors All GPIB and MSIB connections must be made prior to turning on the system Connect the GPIB cables in any arrangement as long as all of the instruments are interconnected Connect the MSIB cables to the instruments in a closed loop fashion You can install the MMS modules in multiple mainframe configurations 2 16 Installation Step 3 Set Up the Equipment with an N1015A Test Setup 2 1 Jitter Transfer and Generation Connections with Mod ular Error Performance Analyzer and Modular Clock Source The 70841A B and 70842A B are the modular error performance analyzers compatible with the 71501D MICROWAVE TRANSITION BANDPASS DISPLAY ANALYZER FILTER Rear Sync In BANDPASS FILTER CLOCK SOURCE GENERATOR MODULATION TEST SEE Alternate Cid i oOoooo connection Pease ooooo trnsfrmms_ts 2 17 Installation Step 3 Set Up the Equipment with an N1015A MODULATION TEST SET Front JITTER Sync MODULATION Out ud 10 MHz Ref In c Rear Sync In 10 MHz Ref MICROWAVE TRANSITION ANALYZER MSIB Out CLOCK SOURCE a MODULAR 22222 commsr_ts Table 2 7 Jitter Transfer and Generation with the Modulation Test Set Make
46. dB attenuator to reduce voltage levels Set up the error performance instruments e Ifthe jitter system has a modular error detector or pattern generator refer to page 2 49 for a detailed procedure on how to set up the modular instru ments e Ifthe equipment setup has two displays or one display that you must switch between the 70820A and the error performance analyzer instruments refer to To use two MMS displays on page 2 54 3 6 Tutorials Tutorial 1 Jitter Transfer Measurements Step 3 Perform a Calibration NOTE If the template you are using was previously saved with calibration data the calibration data is automatically loaded with the template and no calibration is required CAUTION System calibration should be performed before making jitter transfer and jitter tolerance tests or whenever a new standard or custom template is selected 1 Press USER until the Setup key appears on the left menu Press Setup CAL INPUT 2 The calibration can take up to six minutes to execute When the calibration is finished the display will be similar to the following graphic 3 To return to the Main menu press CONT Input Template Calibration Plot 57 16 LII Firmplitude 18 UE 1 59 Modulation Frequency HZ CONT 3 7 NOTE Tutorials Tutorial 1 Jitter Transfer Measurements Step 4 Perform the JitterTransfer Measurement To perform a jitter tr
47. error performance in the presence of specified levels of jitter in Mode plot or list form PAGE Setup JITTER TOLERANCE Errors UP Pt Freq Status PAGE Trnsfer 1 18 HB Hz 22 508 UI p p PRSS OWN 2 31 60 Hz 22 580 UI p p PASS Jitter 3 80 08 Hz 22 598 UI p p PASS Tolrnce 316 88 Hz 22 588 UI p p PASS 5 1 00 kHz 13 50 UI p p PASS ji GE 2 16 kHz 4 272 UI p p PASS ter 7 gg kHz 2 258 UI p p PASS Benerat g 31 50 kHz 2 250 p p PASS ABB HB kHz 2 290 UI p p PASS Gutput 18 54 08 kHz 4 424 UI p p PASS Jitter 1 251 08 kHz B96 UI p p PASS i8 399 00 kHz 585 p p PASS 13 631 08 kHz 357 UT p p PASS Diagnos 1 1 8B MHz 225 p p PASS E Hass prev Starage menu Jitter Output and Displays results of peak to peak and RMS intrinsic jitter measurements Generation Mode pk pk 9 9992 J a ER GENERATION RESULTS Cutoff Frequency 12 488 kHz 45 413E 83 UI p p PH7E 83 UI rms CONT Diagnostic Displays the spectrum and waveform of the clock signal or of the demodulated Measurement jitter signal extracted from the jittered clock signal Use this mode as an aid to Mode solve jitter related problems 1 6 Introduction Analysis with the Agilent 71501D Mite 11 3BL us 333 0 nV
48. find information on the following programming com mands AVERAGE 5 7 AVERAGEFLAG 5 7 BERTHRS 5 8 CALINP 5 9 CUSTOM 5 10 GAIN 5 11 GENERATE 5 12 GENFC1 5 13 GENSWEEPS 5 14 INCLOCKFREQ 5 14 LOAD_TEMPLATE 5 15 MARGIN 5 18 OUTCLOCKFREQ 5 19 OUTFC1 5 20 OUTFC2 5 21 OUTPUT 5 22 OUTSWEEPS 5 23 PAUSE 5 24 QUIT 5 25 REMOTEGATESEC 5 26 SAVE TEMPLATE 5 27 TEMPLATE 5 29 TOLERANCE 5 30 TOLMODE 5 32 TOLSEARCHFACTOR 5 88 TOLSEARCHFLAG 5 34 TRANSFER 5 35 TRANSFER FC 5 86 5 2 Programming Programming Introduction Remote programming commands can be initiated after e the jitter analyzer program has been loaded e the instrument configuration has been determined e the menus and traces have been built e the instrument is waiting for the user to press a front panel key Before communicating with the jitter application the Instrument BASIC sys tem must be queried for the name of the program and told we wish to commu nicate with this program The following example shows how to do this OUTPUT Mta PROG CAT Request list of currently loaded programs ENTER Mta Name IThere can only be one OUTPUT Mta PROG NAME Name ISend program name Use variables to pass commands and data All commands and strings can be sent in upper lower or mixed case Every thing is converted to upper case Because the 70874C is an Instrument BASIC program normal instrument pro gramming techniques are not employed Instead program con
49. is at the front of this manual If the instrument is no longer under warranty or is not covered by an Agilent maintenance plan Agilent will notify you of the cost of the repair after examining the unit When an instrument is returned to a Agilent service office for servicing it must be adequately packaged and have a complete description of the failure symptoms attached When describing the failure please be as specific as possible about the nature of the problem Include copies of additional failure information such as the instrument failure settings data related to instrument failure and error mes sages along with the original cal data disks and the instrument being returned Please notify the service office before returning your instrument for service Any special arrangements for the instrument can be discussed at this time This will help the Agilent service office repair and return your instrument as quickly as possible Contacting Agilent Technologies For technical assistance you can contact your local Agilent Call Center In the Americas call 1 800 452 4844 In other regions visit http www agilent com and click Contact Us Before returning an instrument for service you must first call the Agilent Technologies Instrument Support Center In all regions call 800 403 0801 2 55 CAUTION CAUTION Installation Returning the Instrument for Service Preparing the instrument for shipping
50. keys on the error performance ana lyzer to set the gating time On the 70843 and 70004A press LCL gating GATE BY TIME GATING PERIOD 10 SECONDS On the 86130A press Local Then in the ED Setup menu click Accumulation Setup In the Period select Time and enter 10 seconds If you are using a modular error detector 70842A B follow these steps a Press DISPLAY NEXT INSTR Continue pressing NEXT INSTR until 70842 is displayed at the bottom of the screen b Press DISPLAY NEXT INSTR Continue pressing NEXT INSTR until 70842 is displayed Press MENU dat clk 1 gating GATING PERIOD 10 SEC d To return to the jitter menu press DISPLAY NEXT INSTR and continue pressing NEXT INSTR until 70820 is displayed Press the following keys on the 708204 to set the jitter frequency to 158 kHz USER USER Diagnos JITTER FREQ 158 kHz As the test frequency is changed a one point calibration is performed Set the jitter amplitude to 0 3 by pressing JITTER AMPL 0 8 ENTER Perform the test by pressing USER manual tolrnce MANUAL MEASURE The BER test is made using the set conditions When the BER test is com pleted the test results are displayed The magnitude of the jitter amplitude may be limited due to system limita tions If the level you entered exceeds the system capability the analyzer automatically sets it to the highest attainable level The jitter analyzer displays the results of the manual tolerance
51. mount the 71501D 1 Remove the instrument side strips Attach the hardware e Ifyou have the kit for cabinet flanges attach the flanges to the sides of the front panel Use the screws that are included in the kit e Ifyou have the kit for cabinet flanges and handles arrange the handles so that they are attached next to the front panel with the flange on the outside of the handle Use the screws that are included in the kit Remove the feet and the tilt stands before cabinet mounting the instrument To use two MMS displays When the system includes two 70004 display units the following procedure is recommended Dedicate one display to the 70820A and use the second display for other system instruments To assign the display to other instruments press DISPLAY Address Map Use the knob to highlight the desired instrument then press Assign Both Do not press the NEXT INST softkey to assign the second display to an instrument This is because the second display may take control of the 71501D 2 54 Call Center Service Center Installation Returning the Instrument for Service Returning the Instrument for Service The instructions in this section show you how to properly package the instru ment for return to a Agilent Technologies service office If the instrument is still under warranty or is covered by an Agilent maintenance contract it will be repaired under the terms of the warranty or contract the warranty
52. of the Australian Spectrum Management Agency mMiA This text denotes the instrument is an Industrial Scientific and Medical Group 1 Class A product y The CE mark is a registered trademark of the European Community Procedure Verify that the line power meets the requirements listed in Table 2 4 on page 2 14 Connect the line power cord to the N1015A s rear panel connector Connect the other end of the line power cord to the power receptacle 2 18 Installation Step 2 Install N1015A Optional Various power cables are available to connect the N1015A to ac power outlets unique to specific geographic areas The cable appropriate for the area to which the N1015A is originally shipped is included with the unit You can order additional ac power cables for use in different geographic areas Refer to Table 2 6 on page 2 15 Larry will get back to me on line power requirements and two fuses Table 2 4 N1015A Line Power Requirements Power 115 50VA MAX 230 70 VA MAX Voltage nominal 115 VAC 230 VAC range 115 VAC 90 132 V range 230 VAC 198 254 V Frequency nominals 50 Hz 60 Hz range 47 63 Hz Table 2 5 N1015A Environmental Specifications Use indoor Temperature Operating 0 C to 55 C Non operating 40 C to 70 C Maximum Relative Humidity 80 for temperatures up to 31 C decreasing linearly to 50 relative humidity at 40 C Altitude Operating Up to 5 600 me
53. of the lower frequency lim its of the clock source pattern generator and error detector The highest acceptable Param value is the lowest of the upper frequency lim its of the clock source pattern generator and error detector IPUT IPUT TER Mt TER M TPUT TPUT TER TPUT a PROG NUMB Param 2 48832E9 a PROG STR Command INCLOCKFREQ a PROG WAIT AS a PROG STR Response Response a PROG STAT CONT a PROG WAIT AS a PROG STAT CONT Ccrmoocornmornococc czcczczccc 5 gt LOAD_TEMPLATE The LOAD TEMPLATE command string loads an input jitter template from the current template storage device such as a memory card If a calibration was performed before saving the template the calibration will also be recalled All the parameters listed below are recalled from the template file Values of Program Variables Variable Data Type Value Command string LOAD TEMPLATE Param string filename 1 to 10 characters 5 15 Example Programming Programming Values of Program Variables Variable Data Type Value Response string DONE FILE NOT FOUND DISK NOT PRESENT NOT INITIALIZED DISK 1 0 ERROR xxx a Only filenames beginning with T_ will be displayed when using the Template Storage function from the front panel All filenames will be displayed when using the remote PROG CAT query b
54. or if a calibration is required Result is Rpts array For each frequency in the template four values are sent e jitter frequency in Hz e jitter amplitude in unit intervals peak to peak e error count or error ratio depending on setting of TOLMODE tolerance test flag result where 1 pass 1 fail 128 this point skipped if for example calibration failed at this frequency or error detector is not present 5 30 Example Programming Programming If TOLSEARCHFLAG is OFF the jitter amplitude values will be the template values modified by MARGIN and the error count or error ratio and the toler ance test flag result will correspond to tests made at the template jitter level adjusted by MARGIN If TOLSEARCHFLAG is ON the jitter amplitude values will be the highest jit ter amplitude at which the DUT met the error criterion and the error count or ratio and tolerance test flag result will reflect test results at this jitter ampli tude Mta PROG STR Command TOLERANCE Mta PROG WAIT ER Mta A PUT Mta PROG STR Response ER Mta Response PUT Mta PROG NUMB Rpts int 1 to 28 Must read all 28 rows of 4 values ER Mta USING K Jitfreq Jitampl Errorcount Flag XT Poin PUT Mta PROG STAT CONT PUT Mta PROG WAIT ER Mta A PUT Mta PROG STAT CONT J 45554 20 0 In this example the
55. output clock frequencies are different the Clock Spectrum of the higher frequency signal will be centered in the display while the lower frequency signal will be offset slightly from the center Marker frequencies will be correctly displayed for the lower frequency signal Markers placed on the higher frequency clock trace will have marker frequency values as if that clock signal has been frequency shifted to the lower clock frequency 70820A limitation Miis 2 48556 GHz 130 4 uU JITTER Setup Melt 102 603 kHz 281 8 mU pk pk 1 9978 caret pn Jitter JITTER Trnsf er WAVEF RH Jitter i CLOCK Tolrnce NI V i ji SPECTRA APR T Y T Jitter IH CLOCK Generat WRUEF RM Out put Lu JITTER Jitter FREQ A Wy NN TO 466558 GHz 891 85 kHzzdfv P yari Gh AMPL Trd Che r4 Chi Mass 15 dB div 15 dB div RUTDIRG Storage b dBm ref 3 dBm ref ON OFF Viewing the Clock Spectrum 15 Change the jitter rate and jitter amplitude by pressing JITTER FREQ gt new value ENTER JITTER AMPL gt new value ENTER As the jitter frequency is changed a one point jitter amplitude calibration is performed and the analyzer adjusts the frequency span for the optimum dis play To
56. panel card slot of the microwave transition analyzer facing the metal strip on the card downward and toward the instrument Make sure the card is fully inserted into the card slot Switch on the power to all of the equipment Switch on the power to the 70820A last The start up process takes about 6 minutes If you have reconfigured the equipment after the jitter personality has been loaded refer to Rescan the Equipment after Reconfiguring on page 4 19 Select a template by pressing Setup INtmplt then select one of the templates OC 192 OC 48 OC 12 OC 3 or sdh Ifyou want to review the test point frequencies and levels for a template that you selected press Setup Edit Template To adjust the measurement con ditions specified in the available templates refer to Creating and Editing Templates on page 4 21 e Ifthe data is at an FEC rate or is at a rate other than 155 Mb s 622 Mb s 2488 Mb s 9953 Mb s select the desired input data rate by pressing Nclock FREQ and entering the data rate for OC48FEC enter 2 66606 Gb s for OC192FEC enter 10 7092 Gb s e Ifthe device under test has different data rates between the input and out put the 71501D must be in the MUX DEMUX mode Refer to To Use Differ ent Input Output Data Rates on page 4 24 The clock source and error performance analyzer selected must be capable of operating at the input data rate you specify The signal level from the pattern generator clock ou
57. prev menu Turn the front panel knob to highlight the file AUTOST and then press LOAD FILE This process takes approximately 6 minutes 2 47 Installation Step 5 Load the Personality Pulsgen Measure Table Analyze Calib States page corte OVEN COLD re ix MSI HP HSIB H age 1 AUTOST ASCII JITTE ASCII ibhk tend af catalag Screen to Access the AUTOST file nsi MSIB EJ AGE NEXT AGE LOAD SVE more prey menu 2 48 NOTE Installation Step 6 Select Template and Measurement Conditions Step 6 Select Template and Measurement Conditions When the jitter personality begins running it presets all instruments to their default states You can select a template that sets the clock frequency and the modulation frequency and amplitude but leaves error detector and pattern generator settings unchanged When the main menu is displayed with Setup at the upper left you may adjust pattern generator or error detector parame ters as required by your device or system Select an existing template by pressing Setup INtmplt OC 192 OC 48 OC 12 3 or sdh e Ifyou select the sdh softkey the key choices will be standard rates STM 64 STM 16 STM 4 and STM 1 The initial selection will be the SDH standard at the same clock rate as the previously selected SONET standard e Ifyou s
58. the 71603 71841 70842 com bination of instruments only a band pass filter is required e Ifyou are performing 10 Gb s testing using the 71612 70843 combination of instruments the band pass filter guard band is adequate When using clock frequencies where bandpass filters are not available a low pass filter plus a DC block 11742A can be substituted for the bandpass filter The DC block protects the 70820 sampling input from the DC level of the pattern generator clock output e For 622 Mb s testing use an 800 MHz low pass filter Opt 412 e For 1 to 1 25 Gb s testing use a 1 5 GHz low pass filter Opt 417 e For 2 4 to 3 3 Gb s testing use a 4 0 GHz low pass filter Opt 435 For 9 to 11 5 Gb s testing use a 12 4 GHz low pass filter Opt 467 Set the GPIB and MSIB addresses for the system instruments 5 Refer to To use two MMS displays on page 2 54 if you have more than one 70004A display in your equipment configuration If the device under test has no recovered clock signal refer to Jitter Tolerance for Devices without a Recovered Clock Output on page 3 31 All GPIB and MSIB connections must be made prior to turning on the system 3 19 NOTE NOTE Tutorials Tutorial 2 Jitter Tolerance Measurements Step 2 Set Up the Measurement Conditions Insert the jitter personality card into the front panel card slot of the microwave transition analyzer facing the metal strip on the car
59. through filter TO Microwave Transition Analyzer CH2 Pattern Generator DATA OUT TO DUT DATA IN Test Set OUT 2 5 Gb s or 10 Gb s TO Pattern Generator CLOCK IN Test Set JITTER MODULATION OUT TO Clock Source FM IN EXT 1 INPUT front panel for E4422B DUT RECOVERED CLOCK OUT through splitter TO Error Detector CLOCK IN DUT DATA OUT TO Error Detector DATA IN Configuration with 2 MMS Mainframes MTA Mainframe MSIB OUT rear panel TO PG amp ED Mainframe MSIB IN rear panel PG amp ED Mainframe MSIB OUT rear panel TO MTA Mainframe MSIB IN rear panel Configuration with 3 MMS Mainframes MTA Mainframe MSIB OUT rear panel TO PG Mainframe MSIB IN rear panel PG Mainframe MSIB OUT rear panel TO ED or CIk Source Mainframe MSIB IN rear panel ED or CIk Source Mainframe MSIB OUT rear panel TO MTA Mainframe MSIB IN rear panel a The GPIB connections can be made in any order The on b For 83752A only connect a 50 ohm termination in paral y requirement is that all GPIB instruments are interconnected el using a BNC tee to the rear panel FM INPUT 2 26 Installation Step 3 Set Up the Equipment with an N1015A Test Setup 2 4 Jitter Tolerance Connections with Stand Alone Error Performance Analyzer and Stand Alone Clock Source JITTER MODULATION MICROWAVE TRANSITIO
60. values are converted from character string to floating point numbers as they are ENTERed A program might instead read every thing into one long string variable and then extract the individual values The values are sent 19 characters per value such as 1 27778184201E 002 separated by commas 5 31 Example Programming Programming TOLMODE The TOLMODE command string sets the criterion for passing the jitter toler ance test If TOLMODE is set to BER set the error threshold using BERTHRS Values of Program Variables Variable Data Type Value Command string TOLMODE Param string BER ERRORS Response string DONE or ERROR a ERROR is returned if Param is not BER or ERRORS Mta PROG STR Param BER PUT Mta PROG STR Command TOLMODE T Mta PROG WAIT AS PUT Mta PROG STR Response Response Mta PROG STAT CONT PUT Mta PROG WAIT AS PUT Mta PROG STAT CONT Omoomomooo 2 2 2592592322 20 z 5 32 Example Programming Programming TOLSEARCHFACTOR The TOLSEARCHFACTOR command string sets the value by which the jitter level is to be multiplied each time the jitter tolerance test is redone at a given jitter frequency if TOLSEARCHFLAG is ON Values of Program Variables Variable Data Type Value Command string TOLSEARCHFACTOR Param floating point number gt 0 1 lt 100 Response str
61. 01 1 E n 1008902 1406 03 1 0E O4 10605 41 0606 1 ESOT 10E 08 Jitter Frequency Hz Jitter Stimulus Level Accuracy 8 of setting 0 02 Ul 500 kHz Jitter Frequency 12 of setting 0 02 Ul 500 kHz 2 MHz Jitter Frequency 15 of setting 0 02 Ul 2 MHz 80 MHz Jitter Frequency Note This accuracy is valid for settings at or below amplitude levels that were used for the jitter calibration Jitter Transfer Measurement Measurement Accuracy 0 05 dB lt 500 kHz 3 to 1 dB transfer gain 0 1 dB 500 kHz to 4 MHz 0 2 dB 4 MHz to 80 MHz Measurement Floor 35 dB 2 5 MHz lt 20 dB gt 2 5 MHz 6 6 Specifications and Characteristics Jitter Characteristics Jitter Generation and Output Jitter Measurement The following tables indicate the characteristic jitter levels produced by the test system and indicate the smallest levels of jitter that can be measured The measured result is the integrated phase noise in the band between the software high pass filter corner frequency and the hardware filter bandwidth as shown in the following figure where f is the corner frequency of the software high pass filter selected using the front panel LOWFREQ CORNER function and f is the hardware band pass filter Measured Spectrum Hardware Filter f 80 M 20 M Hz 9953 Mb s Hz 2488 Mb s 5 MHz 622 Mb s 1 3 MHz 155 Mb s Software Filter f Settable from 10 Hz to 4 5 MHz
62. 13 GHz with 80 MHz modulation 71501D options 310 305 If the device test frequency is within the ranges listed above use a configura tion that includes the N1015A modulation test set e For stand alone error performance analyzers 70843A B C and 86130A re fer to Test Setup 2 2 on page 2 20 For modular error performance analyzers 70841A B and 70842A B refer to Test Setup 2 1 on page 2 17 If the device test frequency is outside the ranges listed above use a configura tion that does not include the modulation test set e For stand alone error performance analyzers 70843A B C and 86130A re fer to Test Setup 2 6 on page 2 34 For modular error performance analyzers 70841A B and 70842A B refer to Test Setup 2 5 on page 2 31 If you reconfigure the equipment after the jitter personality has been loaded refer to Rescan the Equipment after Reconfiguring on page 4 19 All GPIB and MSIB connections must be made prior to turning on the system To prevent damage to the 70820A microwave transition analyzer always have either a bandpass filter or a dc block connected to the analyzer input channels Make sure that the bandpass filter matches the frequency range that you will be measuring Connect filters to the 70820A inputs e Ifyou are performing SONET SDH testing with the 86130A or 71612 70843 3 40 Tutorials Tutorial 4 Diagnostic Measurements combination of instruments use these filters 2 488 Gb s band
63. 3250 Error Modulation Detection Source Recovered Clock Agilent Clock 71501D Source Modulation Jitter Test Set Analyzer jitter_tolerance What you will learn in this tutorial Configure the equipment and set up the measurement Perform a calibration Perform a jitter tolerance measurement Select the bit error rate threshold Select the gating time Perform a margin test Perform manual jitter tolerance measurements Plot the measurement results 3 17 NOTE CAUTION Tutorials Tutorial 2 Jitter Tolerance Measurements Step 1 Connect the Equipment Connect the front and rear panel cables in the configuration that matches the device test frequency and your system equipment Refer to Jitter System Configurations on page 2 2 for a list of 71501D system equipment Determine if the device test frequency is within the following ranges e 2 4 to 3 2 GHz with 20 MHz modulation 71501D options 300 305 e 9 8 to 13 GHz with 80 MHz modulation 71501D options 310 305 If the device test frequency is within the ranges listed above use a configura tion that includes the N1015A modulation test set For stand alone error performance analyzers 70843A B C and 86130A connect the test equipment as shown in Test Setup 2 4 on page 2 27 For modular error performance analyzers 70841A B and 70842A B con nect the test equipment as shown in Test Setup 2 3 on page 2 24 If the d
64. 4 12 Diagnos key 3 43 diagnostic description 4 16 measurements menu map 4 7 mode 1 6 different input output data rates 4 24 dimensions 2 14 disks GPIB 4 40 internal RAM 4 39 RAM selecting and formatting 4 39 DISPLAY key 1 3 display mainframe 2 7 duplicate a memory card 4 43 E E4422B signal generator 2 7 editing templates 4 21 ENTER key 1 4 entering a file name 4 47 equipment generation 2 33 2 36 tolerance measurement 3 18 equipment rescanning 4 19 erasing a file 4 47 error detector setting 3 22 error detector modular 3 22 error message memory cards 4 41 error message calibration 2 52 error message SKIPPED 2 52 error messages 4 28 error performance analyzer 2 7 error performance analyzer stand alone 3 22 error calibration 5 9 Index 2 errors threshold 3 22 F factory instrument preset restoration 3 49 4 26 fiber optics connectors covering 2 56 file erasing 4 47 names 4 45 prefix change 4 48 prefixes 4 45 recall 4 47 saving 4 46 filters 2 10 filters bandpass 4 19 formatting memory 4 39 formatting memory cards 4 42 frequency range instruments 2 7 front panel features 2 4 front panel overview 1 3 G gain amplitude 3 11 GAIN command 5 11 gating time 3 23 gating time description 4 13 general device clear 5 5 GENERATE command 5 12 generation and output tutorial 3 32 configuration 3 4 menu map 4 6 mode 1 6 GENFC1 command 5 13 GENSWEEPS comman
65. 4 Mask Jitter Amplitude UI pp 0 1 0 01 1 E 01 1 02 1 03 1 04 1 05 1 06 1 07 Jitter Frequency Hz 6 11 Specifications and Characteristics Jitter Modulation Capabilities of 71501D System Configurations Jitter Amplitude UI pp Jitter Amplitude UI pp 83732B N1015A Capability 2 4 3 2 Gb s 100 10 Maximum Jitter Minimum Jitter OC 48 Mask 1 STM 16 Mask Maximum Jitter Minimum Jitter 04 STM 16 Mask 0 01 4 ES 1 01 1 02 1 03 1 04 1 05 1 06 1 07 1 08 Jitter Frequency Hz 83732B N1015A Capability 9 8 13 Gb s 100 10 gt Maximum Jitter 1 Minimum Jitter OC 192 Mask STM 64 Mask 0 1 0 01 us 1 1 01 1 02 1 03 1 04 1 05 1 06 1 07 1 08 Jitter Frequency Hz 6 12 Specifications and Characteristics Jitter Modulation Capabilities of 71501D System Configurations Agilent E4422B Clock Source Jitter Amplitude UI pp Jitter Amplitude UI pp E4422B Capability 155 M
66. 4A 70820A instrument combination there are two GPIB con nectors The 70004A GPIB connector is used for remote programming The 70820A GPIB connector is a private GPIB used for the equipment setup to al low 70820A jitter personality to control the required instruments If the jitter personality does not load it may be because the display is assigned to an instrument other than the 70820A It may also be because the display mass storage is assigned to the GPIB device 3 50 Verify the Settings and Connections Jitter Spectra Jitter Waveform Tutorials Troubleshooting the Jitter Analyzer System In the Setup menu set the input clock frequency If the device output clock rate is different turn on MUX DMX mode and set the output clock frequency Enter the Diagnos menu The jitter application will perform a jitter magnitude calibration at the current jitter frequency and magnitude The default is 10 kHz and 0 15 UI If a jittered clock signal is present on channel 2 the calibration will finish in a few seconds If no jittered clock signal is present at channel 2 the calibration attempt will repeat up to eight times before the application stops and displays an error message You can cancel the calibration attempt by pressing EXIT Select each of the four displays in turn and verify the waveforms are as described below A signal peak at the current sinusoidal jitter frequency is displayed Normally AUTO DIAG mode is on so the peak
67. 5 1 E 06 1 07 Jitter Frequency Hz 6 9 Specifications and Characteristics Jitter Modulation Capabilities of 71501D System Configurations 83732B Capability 622 Mb s 100 E o Maximum Jitter Minimum Jitter OC 12 Mask STM 4 Mask Jitter Amplitude UI pp o un 0 01 1 E 01 1 02 1 E 03 1 E404 1 05 1 E 06 1 07 Jitter Frequency Hz 83732B Capability 2488 Mb s 100 E o Maximum Jitter Minimum Jitter OC 48 Mask STM 64 Mask Jitter Amplitude UI pp 0 01 1 E 01 1 E 02 1 E 03 1 E404 1 E 05 1 E 06 1 07 Jitter Frequency Hz 6 10 Specifications and Characteristics Jitter Modulation Capabilities of 71501D System Configurations Settings for the results in the following graph Clock of 12 5 GHz use N1015A 10 GHz Modulator Data from 71612C use 1 4 SubRate Output UI Setting use 4x desired 83732B N1015A 71612C Subrate Capability 3 125 Gb s 100 10 Jitter Amplitude UI pp 0 1 0 01 1 01 1 02 1 03 1 04 1 05 1 06 1 07 1 08 Jitter Frequency Hz 83732B Capability 9953 Mb s 100 Maximum Jitter Minimum Jitter OC 192 Mask STM 6
68. A Modulation Test Set Device Under Test Pattern Generator Agilent 71501D Jitter Analyzer Reference CH2 jitter_generation Clock BPF Bandpass Flter The jitter generation and output jitter measurements are performed using the same procedure The only difference is the output jitter measurements are performed at two different low frequency rejection bands The bandwidth s for the measurements are set with a user definable software filter for low fre quency rejection and a hardware bandpass filter for high frequency rejection What you will learn in this tutorial e Set the measurement frequency range e Select the number of noise traces to be averaged e Perform a jitter generation measurement 3 32 NOTE NOTE CAUTION Tutorials Tutorial 3 Jitter Generation and Output Step 1 Connect the Equipment The equipment connections are the same for the jitter generation and jitter transfer measurements Connect the front and rear panel cables in the configuration that matches the device test frequency and your system equipment Determine if the device test frequency is within the following ranges e 2 4 to 3 2 GHz with 20 MHz modulation 71501D options 300 305 e 9 8 to 13 GHz with 80 MHz modulation 71501D options 310 305 If the device test frequency is within the ranges listed above use a configura tion that includes the N1015A modulation test set e For stand
69. AGE UP LIST TOLRNCE PAGE DOWN prev menu prev menu select choice determines this row of menus SELECT L SONET SELECT 192 mat SDH oc 48 GATING TIME none GATING TIME 12 SEARCH onlOFF SEARCH onlOFF SEARCH onlOFF 3 SEARCH Factor SEARCH Factor SEARCH Factor PAUSE PAUSE prev menu prev menu prev menu prev menu SELECT 64 MANUAL MEASURE STM 16 JITTER FREQ GATING TIME 4 JITTER AMP SEARCH onlOFF 1 SEARCH Factor PAUSE prev menu prev menu prev menu jitmenu3 Jitter Tolerance Menu SELECT SEARCH onlOFF SEARCH Factor prey menu 4 5 Reference Menu Maps Main Menu Left Side Softkeys Setup Jitter Trnsfer Jitter Tolrnce Jitter Generat Output Jitter Diagnos Mass Storage Jitter Generation Menu Main Menu Left Side Softkeys Setup Jitter Trnsfer Jitter Tolrnce Jitter Generat Output Jitter Diagnos Mass Storage Output Jitter Menu MEASURE GENERAT LOWFREQ CORNER GENERAT SWEEPS HISENS ON OFF EXIT jitmenu4 MEASURE OUT JIT LOWFREQ CORNER1 LOWFREQ CORNER2 OUT JIT SWEEPS HISENS ON OFF EXIT 4 6 Main Menu Left Side Softkeys Setup Jitter Trnsfer Jitter Tolrnce Jitter Generat Output Jitter Diagnos JITTER JITTER CLOCK CLOCK JITTER JITTER Mass Storage Diagnostic Measurements Menu Main Menu Left Side Softkeys Setup Jitter Trnsfer Jitter Tolrnce Jitter Generat Output Jitter Diagnos SELECT typing aids PAGE UP PAGE DN
70. AT CONT OUTPUT Mta PROG WAIT ENTER Mta A OUTPUT Mta PROG STAT CONT GAIN The GAIN command string sets the transfer gain for the jitter transfer mea surement Values of Program Variables Variable Data Type Value Command string GAIN Param floating point number 30 to 15 dB Response string DONE or ERROR a ERROR is returned if Param is outside the listed value range Example Programming Programming IPUT TPUT TER M TPUT TER M TPUT TPUT TER M TPUT lt lt lt a PROG WAIT Fer I Response lt lt a PROG WAIT AS Crmuocdornmcornmcocococ 2 a PROG STAT CONT a PROG STAT CONT a PROG NUMB Param 10 0 a PROG STR Command GAIN AS a PROG STR Response NOTE GENERATE The GENERATE command string measures the jitter generation Values of Program Variables Variable Data Type Value Command string GENERATE Param There are no parameters for this command Response string DONE or ABORT Rnoise floating point array of 7 see below values a ABORTed if user presses EXIT key during measurement Measurement time is dependent on the device under test and the sensitivity mode used The result is a seven value one dimensional numeric array Rnoise e Peak to peak jitter unit intervals 0 0 e 0 RMS jitter unit in
71. Agilent 71501D Jitter Analysis System User s Guide Agilent Technologies Copyright Agilent Technologies 2002 2003 All Rights Reserved Repro duction adaptation or trans lation without prior written permission is prohibited except as allowed under copy right laws Agilent Part No 71501 90011 Printed in USA September 2003 Agilent Technologies Inc Digital Signal Analysis Opera tion 1400 Fountaingrove Parkway Santa Rosa CA 95408 USA Warranty The material contained in this document is provided as is and is subject to being changed without notice in future editions Further to the maximum extent permitted by applicable law Agilent dis claims all warranties either express or implied with regard to this manual and any information contained herein including but not limited to the implied warranties of mer chantability and fitness for a particular purpose Agilent shall not be liable for errors or for incidental or consequential damages in connection with the furnishing use or perfor mance of this document or of any information contained herein Should Agilent and the user have a separate written agreement with warranty terms covering the material in this document that conflict with these terms the war ranty terms in the separate agreement shall control Restricted Rights Legend Use duplication or disclo sure by the U S Government is subject to restrictions as set fort
72. Analyzer Reference CH2 jitter_generation Clock BPF Bandpass Filter 4 14 Jitter Generation Measurements with No Clock Output Signal Jitter Generation and Output Jitter Measurement Accuracy Jitter Generation and Output Jitter Sensitivity Modes Reference Jitter Measurements If only a data signal is available from the DUT it would first need to pass through a clock recovery scheme which would not add a significant amount of jitter while extracting a clock signal This clock recovery scheme would also need to have a jitter transfer function that was flat over the spectrum of inter est so as not to degrade the measurement results The factors which dominate jitter measurement accuracy are the jitter of the test system itself and its ability to accurately characterize jitter noise signals Test system jitter is dictated to a large extent by the clock source used to time the pattern generator This then sets a minimum or baseline level of jitter that can be measured The uncertainty in making intrinsic jitter measurements not accounting for the baseline jitter is 10 of the measured value There fore measurement uncertainty is 10 baseline The 71501D can measure jitter generation and output jitter in two sensitivity modes high sensitivity mode and normal mode The high sensitivity mode allows you to make measurements with a lower noise floor For example High sensitivity mode at 10 Gb s has 0 02 UI pea
73. B modular pattern generator 70842A B modular error detector 70340A modular synthesized signal generator 71603B error performance analyzer 70841A B modular pattern generator 70842A B modular error detector 70843A B C option UHF error performance analyzer component of 71612A B C pattern generator error detector Clock Source Compatible Jitter Modulation Instrument E4422B RF signal generator 33250A function arb waveform generator 2 9 Installation Introduction Table 2 3 Cables and Accessories for 71501D System Configurations Cables Options and Part numbers SMA to SMA 8120 4948 BNC cable 8120 2582 Reference BNC to SMB cables 8120 5048 GPIB cables 8120 3445 Miscellaneous 3 5 mm f to 2 4 mm f 2 1250 2277 6 dB attenuator 8493C Bandpass Filter 155 Mb s 2 71501D Option 400 0955 0969 Bandpass Filter 622 Mb s 2 71501D Option 410 0955 0732 Low Pass Filter 800 MHz 2 71501D Option 412 0955 1465 Low Pass Filter 1 5 GHz 2 71501D Option 417 0955 1464 Bandpass Filter 2488 Mb s 2 71501D Option 420 0955 0731 Bandpass Filter 2666 Mb s 2 71501D Option 430 0955 1468 Low Pass Filter 4 0 GHz 2 71501D Option 435 0955 1466 Bandpass Filter 9953 Mb s 2 71501D Option 440 0955 0970 Bandpass Filter 10 7092 Gb s 2 71501D Option 450 0955 1469 Bandpass Fil
74. Conditions Insert the jitter personality card into the front panel card slot of the microwave transition analyzer facing the metal strip on the card downward and toward the instrument Make sure the card is fully inserted into the card slot Switch on the power to all of the equipment Switch on the power to the 70820A last The start up process takes about 6 minutes If you have reconfigured the equipment after the jitter personality has been loaded refer to Rescan the Equipment after Reconfiguring on page 4 19 Select the clock frequency by pressing Setup INclock FREQ The clock frequency you selected must be compatible with any bandpass filters used in the signal paths The clock frequency can also be selected by choosing a standard template in the Setup menu as shown in the next step Select a template by pressing Setup INtmplt then select one of the templates OC 192 OC 48 OC 12 OC 3 or sdh Ifyou want to review the test point frequencies and levels for a template that you selected press Setup Edit Template To adjust the measurement con ditions specified in the available templates refer to Creating and Editing Templates on page 4 21 e Ifthe data is at an FEC rate or is at a rate other than 155 Mb s 622 Mb s 2488 Mb s 9953 Mb s select the desired input data rate by pressing Nclock FREQ and entering the data rate for OC48FEC enter 2 66606 Gb s for OC192FEC enter 10 7092 Gb s e Ifthe device under test
75. ER THRESHLD Use the knob step keys or keypad to adjust the threshold The default is 1x107 For example to enter a BER threshold of 1x1075 press BER THRESHLD 1 E 10 ENTER The error rate can be entered using the knob step keys or numeric keypad If the error rate is lower than the specified BER threshold during the gating time the test will pass at each frequency in the template The BER test is repeated at each frequency test point Set the error detector to the desired data pattern e Ifyou are using a stand alone error performance analyzer 70843A B C with 70004A display or 86130A press the following keys on the error perfor mance analyzer to set the data pattern On the 70843A B C and 70004A press Lel Pattern and choose a pattern On the 86130A press Local In the Pattern menu click Pattern Select and choose a pattern f you are using a modular error detector 70842A B press the following keys from the 700044 DISPLAY NEXT INSTR Continue pressing until 70842 is displayed USER pattern and then select the desired data pattern DISPLAY NEXT INSTR Continue pressing until 70820 is displayed Then press USER USER 3 22 NOTE Optional Step NOTE Tutorials Tutorial 2 Jitter Tolerance Measurements If the device under test is a multiplexer a pattern must be set up for either the pattern generator or the error detector so that all bits received by the error detector are specifi
76. FCI 5 20 OUTFC2 5 21 OUTPUT 5 22 OUTSWEEPS 5 23 PAUSE 5 24 programming 5 2 QUIT 5 25 REMOTEGATESEC 5 26 Index 1 Index SAVE_TEMPLATE 5 27 TEMPLATE 5 29 TOLERANCE 5 30 TOLMODE 5 32 TOLSEARCHFACTOR 5 33 TOLSEARCHFLAG 5 34 TRANSFER 5 35 TRANSFER FO 5 36 compatible instruments 2 3 configuration displayed 4 37 configurations jitter 2 2 2 7 configure equipment transfer 3 4 connections jitter tolerance 2 39 2 42 controlling calibrator signal 4 36 corner frequency 3 9 correction RF 4 30 correction traces viewing 4 33 creating a plot 4 50 a print 4 49 templates 4 21 4 22 CSA mark 2 13 custom template creation 4 22 transfer specification 4 26 CUSTOM command 5 10 D data and clock alignment 3 23 different input output rates 4 24 pattern setting 3 22 rates different input output 4 24 default gating time 4 13 degraded BER 3 26 DELAY key 1 4 delay matching between channels 4 31 deleting a file 4 47 delta plot description 4 10 demultiplex 3 16 description delta plot 4 10 diagnostic capabilities 4 16 gating time 4 13 generation with no clock output 4 15 jitter tolerance 4 11 jitter transfer 4 9 jitter transfer measurement uncertainties 4 10 margin testing 4 12 numerical listing 4 10 single point testing 4 12 tolerance measurement uncertainties 4 13 tolerance searching 4 12 transfer plot 4 10 device clear 5 5 devices with no clock output
77. In Bl Ch1 Ch 2 o e BANDPASS SS FILTER SEE Clock Out looo L1 Recovered Data Out Clock Out BANDPASS E o o7 DUT FILTER IS OO O00 o o o o amt ERROR Clock In Ke PERFORMANCE Alternate ANALYZER connection for 2 4 3 2 Gb s ti Alternate connections Out DUT Out 10Gb s MIA n2 96b s CLOCK SOURCE MODULATION Inf Jitter Jitter Out TEST SET In 90 0 000r 01651 BHHEHBE BHBEH O oooooo Huuud Rear RF FM In Out imsfibert is If you are using an 83752 clock source connect a BNC tee and a 50 ohm termi nation to the rear panel FM IN 1 The 70843A B C or 86130A error performance analyzer 2 20 Installation Step 3 Set Up the Equipment with an N1015A MICROWAVE 10 MHz Ref Output TRANSITION ANALYZER Rear Sync In PERFORMANCE ANALYZER Jitter Out Front CLOCK SOURCE JITTER MODULATION 19 MEE Ref Out combert ts 2 21 Installation Step 3 Set Up the Equipment with an N1015A Table 2 8 Jitter Transfer and Generation with the Modulation Test Set Make This Instrument Connection TO This Instrument Jitter Modulation SYNC OUT TO Microwave Transition Analyzer SYNC IN rear panel Jitter Modulation SIGNAL TO Test Set JITTER MODULATION IN Jitter Modulation GPIB rear panel TO GPIB INTERCONNECT rear panel Clock Source RF OUTPUT stand alone Cl
78. K IN Test Set GPIB rear panel TO GPIB INTERCONNECT rear panel Configuration with 2 MMS Mainframes MTA Mainframe MSIB OUT rear panel TO PG amp ED Mainframe MSIB IN rear panel PG amp ED Mainframe MSIB OUT rear panel TO MTA Mainframe MSIB IN rear panel Configuration with 3 MMS Mainframes MTA Mainframe MSIB OUT rear panel TO PG Mainframe MSIB IN rear panel PG Mainframe MSIB OUT rear panel TO ED or CIk Source Mainframe MSIB IN rear panel ED or CIk Source Mainframe MSIB OUT rear TO MTA Mainframe MSIB IN rear panel panel a The GPIB connections can be made in any order The only requirement is that all GPIB instruments are interconnected b For 83752A only connect a 50 ohm termination in parallel using a BNC tee to the rear panel FM INPUT c The test set DUT Out and CH1 MTA port connections are for 9 8 13 Gb s operation and act only as a thru for 2 4 3 2 Gb s operation If the test set does not have these ports connect the device under test recovered clock out directly to the channel 1 bandpass filter 2 19 Installation Step 3 Set Up the Equipment with an N1015A Test Setup 2 2 Jitter Transfer and Generation Connections with Stand Alone Error Performance Analyzer and Stand Alone Clock Source JITTER MODULATION MICROWAVE RO TRANSITION OBSBBBE S DISPLAY ANALYZER Sync Out Signal Rear Sync
79. LOAD TEMPLAT SAVE TEMPLAT VERSION amp CONFIG Templat Storage jitmenu7 Template Storage Menu Reference Menu Maps SPECTRA WAVEFRM SPECTRA WAVEFRM FREQ AMPL AUTODIAG ON OFF ENTER LINE SELECT CHAR INSERT REPLACE SPACE DELETE CHAR CLEAR TO END prev menu RE CONFIG CONT 4 7 Reference Jitter Measurements Jitter Measurements High speed digital transmission systems are often required to receive or regenerate data using a clock signal that is recovered or extracted from the data waveform Variation in the data rate commonly known as jitter can com plicate the clock recovery and data regeneration process To guarantee a high level of performance in the presence of jitter components and systems are typically required to adhere to a rigorous set of jitter performance standards The Agilent 71501D system allows you to do a thorough jitter characterization of your devices with the following measurement applications e Jitter transfer e Jitter tolerance e Jitter generation and output jitter e Jitter diagnostics 4 8 Agilent 33250A Modulation Source Reference Jitter Measurements Jitter Transfer The 71501D controls the clock source to produce a data waveform with the specific input jitter levels and frequency range required by SONET SDH or custom standards Jitter transfer is typically used to describe how a clock recovery module or repeater locks and tracks dat
80. LTER Rear Syne In Clock Out CLOCK SOURCE Data Out Clock In KA LG m ERROR PERFORMANCE ANALYZER Recovered Clock Out Data Out tolbert If you are using an 83752 clock source connect a BNC tee and a 50 ohm termination to the rear panel FM IN 1 The 70843A B C and 86130A stand alone error performance analyzers are compatible with the 71501D 2 40 Installation Step 3 Set Up the Equipment without an N1015A MICROWAVE 10 MHz Ref Output TRANSITION ANALYZER Rear Sync In ERROR PERFORMANCE ANALYZER CLOCK SOURCE 10 MHz Ref In JITTER MODULATION eh las Ref Out combertr 2 41 Installation Step 3 Set Up the Equipment without an N1015A Table 2 14 Connections for Jitter Tolerance with No Modulation Test Set Make This Instrument Connection TO This Instrument Jitter Modulation SYNC OUT TO Microwave Transition Analyzer SYNC IN rear panel Jitter Modulation SIGNAL TO Clock Source FM IN EXT 1 INPUT front panel for E4422B Jitter Modulation GPIB rear panel TO GPIB INTERCONNECT rear panel Clock Source Stand Alone RF OUTPUT Clock Source Modular CLOCK OUT 0 Pattern Generator CLOCK IN Clock Source 10 MHz REF OUT rear panel TO Jitter Modulation 10 MHz REF IN rear panel Clock Source Stand Alone GPIB rear panel
81. MENU page 1 of 2 States more 1 of 2 mass storage The display should show a listing of the files on the memory card 4 17 Reference Analyzer System Configuration and Setup 3 11 24 43 APR 22 1996 Prefix MST HP MSIB Page 1 RUTOST ASCII 1533 1 001 HP HB UC 005 T RBUI BOAT cab T_BRAUT BOAT 8384 T HRISUI BDRT rab T BREUI BDRT 2344 T BOAT T HR5UI BDRT 2344 T 15UI BOAT T_AUI BDRT 2304 lend of catalog BOAT 2304 T_5UI BOAT 2344 T 1HUI BDRT 2344 T Paul BDRT 2304 Example Listing of Memory Card Files If the screen does not resemble the above figure press msi MSIB CARD DISPLAY Mass Storage msi MEMORY CARD MENU The list of files should now be displayed Turn the front panel knob to highlight the file AUTOST 5 Load the highlighted file by pressing LOAD FILE If you load the 70874B file by mistake instead of AUTOS the message 7386 memory overflow may be displayed This error message is a result of the manual loading process and in this instance does not indicate a prob lem The program should still be properly loaded 4 18 Reference Analyzer System Configuration and Setup Rescan the Equipment after Reconfiguring If you have changed the equipment in the system you can perform the follow ing procedure so that the analyzer rescans the GPIB and MSIB instruments On the
82. Mainframe MSIB OUT rear panel TO ED or CIk Source Mainframe MSIB IN rear panel ED or CIk Source Mainframe MSIB OUT rear panel TO MTA Mainframe MSIB IN rear panel a The GPIB connections can be made in any order The on b For 83752A only connect a 50 ohm termination in paral y requirement is that all GPIB instruments are interconnected el using a BNC tee to the rear panel FM INPUT 2 22 Installation Step 3 Set Up the Equipment with an N1015A c The test set DUT Out and CH1 MTA port connections are for 9 8 13 Gb s operation and act only as a thru for 2 4 3 2 Gb s operation If the test set does not have these ports connect the device under test recovered clock out directly to the channel 1 bandpass filter 2 23 BANDPASS FILTER MODULATION TEST SET ple e Installation Step 3 Set Up the Equipment with an N1015A Test Setup 2 3 Jitter Tolerance Connections with Modular Error Per formance Analyzer and Stand Alone Clock Source MICROWAVE TRANSITION DISPLAY ANALYZER Rear Sync In Luogo ooo co000 omg ERROR DETECTOR Recovered Clock Out connections Syne Out JITTER MODULATION oo 00 uuu OO ooooo BH BE 5586656 66 BHEBH 3 L1 000000 WANN nun oo Oooo um a FM Modulation
83. Margin Testing Tolerance Searching Single Point Testing Jitter Tolerance of Devices with No Clock Output Signal Reference Jitter Measurements The jitter tolerance measurement process is as follows a Perform a BER measurement of the DUT with jitter free data b Attenuate the signal power until the onset of errors or a specific BER is achieved c Reduce the attenuation 1 dB d Theresults of the BER test are monitored by the 71501D where the 71501D compares the actual BER performance to the desired level defined by you to determine the pass or fail status e This process is repeated for each test point as defined by the test template The above method is used to verify compliance to a given test standard If the DUT passes the test it is still unknown just what level of tolerance is achiev able You can perform a margin test by selecting a percentage margin by which to increase the jitter magnitude at each test point You could also use another technique where you perform a tolerance search In this mode the 71501D initially performs the BER test with the jitter level set to that of the template The jitter will then be systematically increased by a factor that you define and a BER test performed until the desired BER limit is exceeded or the test system generation capability is exceeded If the DUT is not capable of achieving basic compliance levels the search factor can be set to a negative level In this mode the ji
84. May be caused by illegal characters in the filename The characters in the filename are restricted to numbers letters and the underscore The first character of the filename must be a letter All characters in the filename are converted to uppercase When using the front panel Template Storage Load Template and Save Tem plate functions the prefix T_ is added to the eight character filename entered by the user When using the remote programming commands the prefix is not added and the user may enter all ten characters However only filenames beginning with _ will be displayed when using the Template Storage function from the front panel All filenames will be displayed when using the remote PROG CAT query TPUT Mta PROG STR Param filename TPUT Mta PROG STR Command LOAD_TEMPLATE TPUT Mta PROG WAIT ER Mta A TPUT Mta PROG STR Response ER Mta Response TPUT Mta PROG STAT CONT TPUT Mta PROG WAIT TER Mta A TPUT Mta PROG STAT CONT 5 Cermoormmorncoccc gt 5 16 Programming Programming The following parameters are saved and recalled INCLOCKFREQ OUTCLOCKFREQ TEMPLATE OC 3 OC 12 OC 48 OC 192 STM 1 STM 4 STM 16 STM 64 or custom Calibration valid flag Template the number of points in the template for each point jitter frequency jitter amplitude jitter modulation source output voltage from calibr
85. N DISPLAY ANALYZER Rear Sync In ooooooo T OI SE BANDPASS FILTERS ERROR PERFORMANCE Clock ANALYZER In Recovered Clock Out Alternate connections 10Gb s NeNSS E q CLOCK SOURCE In Jitter Out MODULATION TEST SET poo C0000 eno ooooo a 00000 O oooooo Hun tolbert ts If you are using an 83752 clock source connect a BNC tee and a 50 ohm termi nation to the rear panel FM IN 1 The 70843A B C or 86130A error performance analyzer 2 See Jitter System Configurations on page 2 2 for a list of clock sources 2 27 Installation Step 3 Set Up the Equipment with an N1015A MICROWAVE 10 MHz Ref Output TRANSITION ANALYZER Rear Sync In PERFORMANCE ANALYZER Jitter Out Front CLOCK SOURCE JITTER MODULATION 10 MHZ Ref Out combert_ts 2 28 Installation Step 3 Set Up the Equipment with an N1015A Table 2 10 Connections for Jitter Tolerance with a Modulation Test Set panel Make This Instrument Connection TO This Instrument Jitter Modulation SYNC OUT TO Microwave Transition Analyzer SYNC IN rear panel Jitter Modulation SIGNAL TO Test Set JITTER MODULATI
86. OFF Adds delay Jaken Automatic a IF qe calibration lspLF routines Tera Tes ES cal test TrizChi Page 25 m div 8 af B AY ref The Calibration Menu t 1B ns div signal Manual calibrator control 4 29 To Calibrate the IF To Turn Off RF Correction Reference Calibrating the Analyzer Calibrating the IF The microwave transition analyzer module provides separate automatic IF cal ibration routines for channel 1 and channel 2 Each requires approximately 30 minutes to run For optimum performance you should perform the calibra tions when at least one of the following is true e The temperature has changed 5 Centigrade since the last calibration was performed More than one week has passed since the last calibration Before any critical measurement Warm up time Allow the microwave transition analyzer module to warm up for at least one hour before performing a calibration Connect a low loss cable between the front panel CALIBRATOR OUTPUT and channel 1 connector To calibrate the IF press MENU 1 of 2 Calib IF calib CAL CAL The calibration routine takes about 30 minutes to complete Disconnect the cable from channel 1 and connect it to the channel 2 connector Repeat the previous steps for channel 2 Turning Off RF Correction The microwave transition analyzer module applies RF correction factors to all measurements These correction factors ar
87. ON IN Jitter Modulation GPIB rear panel TO GPIB INTERCONNECT rear panel Clock Source Stand Alone RF OUTPUT TO Test Set IN 2 5 Gb s or 10 Gb s Clock Source Modular CLOCK OUT Clock Source 10 MHz REF OUT rear panel TO Jitter Modulation 10 MHz REF IN rear panel Clock Source Stand Alone GPIB rear panel TO GPIB INTERCONNECT rear panel Microwave Transition Analyzer 10 MHz RF OUT TO Clock Source 10 MHz REF IN rear panel rear panel Microwave Transition Analyzer GPIB rear panel TO GPIB INTERCONNECT rear panel Pattern Generator CLOCK OUT through filter TO Microwave Transition Analyzer CH2 Pattern Generator DATA OUT TO DUT DATA IN Test Set OUT 2 5 Gb s or 10 Gb s TO Pattern Generator CLOCK IN Test Set JITTER MODULATION OUT TO Clock Source FM IN EXT 1 INPUT front panel for E4422B DUT RECOVERED CLOCK OUT through splitter TO Error Detector CLOCK IN DUT DATA OUT TO Error Detector DATA IN Configuration with 2 MMS Mainframes MTA Mainframe MSIB OUT rear panel TO PG amp ED Mainframe MSIB IN rear panel PG amp ED Mainframe MSIB OUT rear panel TO MTA Mainframe MSIB IN rear panel Configuration with 3 MMS Mainframes MTA Mainframe MSIB OUT rear panel TO PG Mainframe MSIB IN rear panel PG Mainframe MSIB OUT rear panel TO ED or CIk Source Mainframe MSIB IN rear panel ED or CIk Source Mainframe MSIB OUT rear TO MTA Mainframe MSIB IN rear panel a The GPIB connections can be made in any order The on b For
88. QUIT The QUIT command string causes the Jitter Analyzer Personality to terminate This command does not pause upon completion program execution stops immediately To restart it press USER gt Control gt RUN Values of Program Variables Variable Data Type Value Command Param There are no parameters for this command Response There is no response from this command Example OUTPUT Mta PROG STR Command QUIT 5 25 Example Programming Programming REMOTEGATESEC The REMOTEGATESEC command string causes the error detector gating time in seconds to be used for a jitter tolerance measurement It may be anywhere from 1 to 8 639999 6 99 days 23 hours 59 minutes and 59 sec onds If this command is not used a value of one second is used Values of Program Variables Variable Data Type Value Command string REMOTEGATESEC Param floating point number 1 to 8 639999E6 Response string DONE or ERROR a ERROR is returned if Param is outside the listed value range a PROG NUMB Param 15 a PROG STR Command REMOTEGATESEC a PROG WAIT AS a PROG STR Response Response a PROG STAT CONT a PROG WAIT AS a PROG STAT CONT SS lt lt lt rm 20 zz zz Omoomomoooc m 20 lt 5 20 ca 5 26 Programming Programming SAVE_TEMPLATE The SAVE_TEMPLATE c
89. R Response Response Mta PROG STAT CONT T Mta PROG WAIT ER Mta A PUT Mta PROG STAT CONT 20 E amp C rmuoocornmcornmcocococ iz is j 20 co The following parameters are saved and recalled INCLOCKFREQ OUTCLOCKFREQ TEMPLATE OC 3 OC 12 OC 48 OC 192 STM 1 STM 4 STM 16 STM 64 or custom Calibration valid flag Template the number of points in the template for each point jitter frequency jitter amplitude jitter modulation source output voltage from calibration jitter amplitude adjusted flag from calibration Jitter transfer AVERAGEFLAG AVERAGE number of sweeps GAIN TRANSFER FC limit line type OC 3 OC 12 OC 48 OC 192 STM 1 STM 4 STM 16 STM 64 or OFF Jitter tolerance TOLMODE BERTHRS MARGIN margin limits based on calibration Jitter generation GENFCI GENSWEEPS Output jitter OUTFCI OUTFC2 OUTSWEEPS 5 28 Example The following parameters are NOT saved e SEARCH ONIOFF e Search Factor e Sensitivity mode for generation and output measurements Programming Programming TEMPLATE The TEMPLATE command string selects one of the standard templates requires approximately 10 seconds Values of Program Variables Variable Command Data Type string Value TEMPLATE Param string OC 192 C 48 C 12 C 3 M 64 M 16 M 4 M 1 222222 Response string DONE or ERROR a ERROR i
90. R and select the desired jitter measurement Jitter Trnsfer Jitter Tolrnce Jitter Generat Output Jitter and press the measurement key MEASURE TRNSFER TOLRNCE GENERAT OUT JIT to generate new re sults The measurement will be done with the previously set of jitter measure ment conditions Pressing the 70820A INSTR PRESET is not recommended It is also not recommended to customize and use the instrument preset func tion If you did customize the instrument preset follow the instruction below to restore the factory instrument preset To Restore the Factory Instrument Preset Press MENU gt page 1 of 2 gt States gt more 1 of 2 gt preset FACIUSR FAC 3 49 Tutorials Troubleshooting the Jitter Analyzer System Have you repeatedly pushed the front panel ON OFF power switch on the N1015A modulation test set If you have check the modulation test set fuse Disconnect the power cord and remove the fuse from the test set power mod ule on the rear panel See the graphic below Use a continuity light or an ohm meter to check the fuse An ohmmeter should read very close to zero ohms if the fuse is good If the fuse is bad replace it with the spare fuse 2110 1124 qg652d If there has been a low supply voltage due to brown out conditions check the modulation test set fuse Refer to the above item for directions and fuse part number Ensure that the GPIB connections are to the correct connector On the rear panel of the 7000
91. ROG WAIT Example zzz D gt AS a PROG STR Response Response a PROG STAT CONT a PROG WAIT AS a PROG STAT CONT zzgE C rmuoornmcornmocococ BERTHRS The BERTHRS command string sets the error ratio threshold for the jitter tol erance test Values of Program Variables Variable Data Type Value Command string BERTHRS Param floating point number 1 to 1E 20 Response string DONE or ERROR a ERROR is returned if the Param is outside the listed value range TPUT TPUT TPUT TER M TPUT TER M TPUT TPUT TER M TPUT a PROG NUMB Param 1E 9 a PROG STR Command BERTHRS a PROG WAIT AS a PROG STR Response Response a PROG STAT CONT a PROG WAIT AS a PROG STAT CONT Example zEZgEBgEEE Cermoornmorncoccc gt 5 8 NOTE Programming Programming CALINP The CALINP command string calibrates the previously specified input tem plate refer to the CUSTOM or TEMPLATE commands A 28 point calibration takes about 3 5 minutes A bandpass filter designed for jitter measurement at the current INCLOCK FREQ should be in place on the 70820 input 2 Values of Program Variables Variable Data Type Value Command string CALINP Param There are no parameters for this command Response string DONE or ERROR
92. SERT or softkey determines the action of the SELECT CHAR soft key Choices are INSERT a character REPLACE an existing character or DELETE a character e Press the and U keys beneath the front panel knob to move the com mand entry cursor Use the CLEAR TO END softkey to remove characters from the command entry cursor to the end of the command To erase a custom prefix press MENU page 1 of 2 States more 1 of 2 mass storage more CHANGE PREFIX Repeatedly press the U step key until the cursor is located at the start of the custom text Clear the text by pressing CLEAR TO END ENTER LINE 4 48 To Create a Print 1 Reference Print or Plot Measurement Results Print or Plot Measurement Results Often it is important to get hard copies of the display for reports or records The display can be printed on any PCL language printer These printers sup port the Hewlett Packard PCL printer language and include the following e ThinkJet e PaintJet e LaserJet The printer must have a GPIB interface Connect the printer to the display via a GPIB cable Be sure to connect the GPIB to the display s connector not to the connector on the 70820A microwave transition analyzer module The first time the printer is used enter the printer type and address by pressing DISPLAY Hard Copy printer address GPIB TLK LSN to configure the printer in talk listen mode on the GPIB or GPIB L ONLY to confi
93. ST softkey to assign the second display to an instrument The second display may take control of the 71501D 3 Set the GPIB addresses on the individual instruments e When using more than one GPIB clock source you can set the GPIB address es from 1 through 30 provided that the instruments are at different address 2 43 Installation Step 4 Set the MSIB and GPIB addresses es e When you first switch on the power to the 70820A the instrument polls the connected equipment for GPIB addresses The 70820A occupies two con secutive GPIB addresses 2 44 Installation Step 5 Load the Personality Step 5 Load the Personality Insert the jitter personality card into the front panel card slot of the 70004A display facing the metal strip on the card downward and toward the instrument Make sure the card is fully inserted into the card slot If the 70004A display was previously assigned to the 70820A module continue with this procedure If not refer to If the Program Does Not Load on page 2 46 Switch on the power to all of the instruments switching on the 70820A last Wait for the system to complete its start up routines and load the program e After a brief period of time the display shows the message at the bottom of the screen Loading 70874D Please wait e Wait for the program to finish loading which takes approximately 6 minutes A small orange LED next to the card slot will flash on and off while the p
94. Signal Input tolmms_ts 1 The 70841A B and 70842A B are the modular error performance analyzers compatible with the 71501D 2 24 Installation Step 3 Set Up the Equipment with an N1015A 10 MHz Ref Rear Syne In Out MICROWAVE TRANSITION ANALYZER re MODULATION TEST SET ERROR DETECTOR Front Jitter Out JITTER Front MODULATION Sync Ref Out rmmstol ts 2 25 Installation Step 3 Set Up the Equipment with an N1015A Table 2 9 Connections for Jitter Tolerance with a Modulation Test Set Make This Instrument Connection TO This Instrument Jitter Modulation SYNC OUT TO Microwave Transition Analyzer SYNC IN rear panel Jitter Modulation SIGNAL TO Test Set JITTER MODULATION IN Jitter Modulation GPIB rear panel TO GPIB INTERCONNECT rear panel Clock Source Stand Alone RF OUTPUT Clock Source Modular CLOCK OUT 0 Test Set IN 2 5 Gb s or 10 Gb s Clock Source 10 MHz REF OUT rear panel TO Jitter Modulation 10 MHz REF IN rear panel Clock Source Stand Alone GPIB rear panel TO GPIB INTERCONNECT rear panel Microwave Transition Analyzer 10 MHz RF OUT rear panel 0 Clock Source 10 MHz REF IN rear panel Microwave Transition Analyzer GPIB rear panel TO GPIB INTERCONNECT rear panel Pattern Generator CLOCK OUT
95. Write a complete description of the failure and attach it to the instrument Include any specific performance details related to the problem The following information should be returned with the instrument e Type of service required e Date instrument was returned for repair Description of the problem Whether problem is constant or intermittent Whether instrument is temperature sensitive Whether instrument is vibration sensitive Instrument settings required to reproduce the problem Performance data Company name and return address Name and phone number of technical contact person Model number of returned instrument Full serial number of returned instrument List of any accessories returned with instrument The original cal data disks Cover all front or rear panel connectors that were originally covered when you first received the instrument Cover electrical connectors to protect sensitive components from electrostatic damage Cover optical connectors to protect them from damage due to physical contact or dust Instrument damage can result from using packaging materials other than the original materials Never use styrene pellets as packaging material They do not adequately cushion the instrument or prevent it from shifting in the carton They may also cause instrument damage by generating static electricity Pack the instrument Use original packaging or comparable Original materials are available through any Agil
96. a as the data has jitter placed upon it In this measurement the jitter modulation at a specific modulation rate or frequency is impressed upon the data To determine the jitter transfer the analyzer measures the jitter on the clock output of the pattern generator pro portional to the jitter on the pattern generator data output and the jitter of the recovered clock signal from the device under test The jitter at the input to the device under test DUT as well as the jitter at the output of the DUT are measured simultaneously The jitter transfer at this jitter rate is then com puted The jitter frequency is incremented and the measurement is repeated This process continues until the device has been characterized over the full bandwidth of interest The measurement results in a ratio of the jitter on the output of the device or system compared to the jitter on the data going into the device Because the measurement is a ratio the results are unitless and expressed in decibels The magnitude of the jitter is typically set at levels specified for a jitter tolerance test discussed later The signal flow diagram for a jitter transfer measurement is shown below BPF Bandpass FIlter Recovered Clock Agilent 71501D Jitter Analyzer Pattern Modulation Generator Test Set Clock Reference jitter_transfer 4 9 Transfer Plot Delta Plot Numerical Listing Jitter Transfer Measurement Uncertainties Reference
97. ader signals some of the sidebands may be viewed and measured us ing Clock Spectrum Jitter Waveform and Jitter Spectrum may be used for modulating frequen cies below about 300 kHz and jitter levels below about 6 UI e Additionally Jitter Spectrum may be used for low jitter signals up to a few MHz Jitter Waveform may be used for lower frequency jitter at magnitudes up to about 63 UI For higher frequencies the number of cycles displayed increases If too many cycles are shown use Jitter Spectrum With the Jitter Spectrum display as the jitter level and signal bandwidth increases a higher sampling frequency must be used which pushes the modulation peak left into the DC term For higher jitter level shift to Jitter Waveform 8 To view the frequency spectrum of the demodulated jitter signal press JITTER SPECTRA 3 43 Tutorials Tutorial 4 Diagnostic Measurements 9 Change the jitter rate and jitter amplitude by pressing JITTER FREQ gt new value ENTER JITTER AMPL gt new value ENTER As the jitter frequency is changed the analyzer adjusts the frequency span for the optimum display To disable this feature and maintain a constant span press AUTODIAG ON OFF OFF If the AUTODIAG function is on the sweep rate is automatically set so the selected jitter frequency lies within the leftmost tenth of the screen unless the jitter frequency is above 300 kHz If the jitter frequency is above 300 kHz the jitter
98. alone error performance analyzers 70843A B C and 86130A connect the test equipment as shown in Test Setup 2 2 on page 2 20 For modular error performance analyzers 70841A B and 70842A B con nect the test equipment as shown in Test Setup 2 1 on page 2 17 If the device test frequency is outside the ranges listed above use a configura tion that does not include the modulation test set For stand alone error performance analyzers 70843A B C and 86130A connect the test equipment as shown in Test Setup 2 6 on page 2 34 For modular error performance analyzers 70841A B and 70842A B con nect the test equipment as shown in Test Setup 2 5 on page 2 31 If you reconfigure the equipment after the jitter personality has been loaded refer to Rescan the Equipment after Reconfiguring on page 4 19 All GPIB connections must be made prior to turning on the system To prevent damage to the 70820A microwave transition analyzer always have either a bandpass filter or a dc block connected to the analyzer input channels Make sure that the bandpass filter matches the frequency range that you will be measuring 3 Connect filters to the 70820A inputs e Ifyou are performing SONET SDH testing with the 86130A or 71612 70843 3 33 NOTE NOTE Tutorials Tutorial 3 Jitter Generation and Output combination of instruments use these filters 2 488 Gb s bandpass Opt 420 plus 4 GHz low pass Opt 435 2 66 Gb s band
99. als at rates other than those for which filters are supplied ensure the filters have characteris tics similar to those described above The RLC corporation is one possible source for custom filter designs Their address is RLC Electronic 83 Radio Circle Mt Kisco NY 10549 Phone 914 241 1334 Fax 914 241 1753 NOTE It may be necessary to cascade a low pass filter 3 or 4 GHz with the bandpass filter if the bandpass filter has spurious passbands at frequencies where the clock signal has significant harmonic content For jitter transfer measurements best results will be obtained when filters are used on both 70820A microwave transition analyzer input channels and when the filters are closely matched When jittered clock signal bandwidths exceed about 10 MHz the application measures the power in the first pair of side bands If the two filters differ in attenuation at the jitter frequency measure ment error is increased For narrower jittered clock signals it is group delay mismatch between the two filters which increases the measurement error 4 20 Reference Analyzer System Configuration and Setup NOTE To Load a Previously Saved Template Creating and Editing Templates There may be times when you need to measure a device with a different fre quency range or jitter level than is available through a standard template For example if to accurately characterize the jitter transfer function you m
100. ansfer measurement press Jitter Trnsfer MEASURE TRNSFER You could press PAUSE ON before you press MEASURE TRNSFER so the 70820A pauses between setting the jitter frequency and taking the measurement data This pause allows you to change conditions on the test device before each measurement For example you may need to ensure that the device stays phase locked Pressing PAUSE OFF returns the 70820A to automatically setting the jitter frequency and immediately taking measurement data While the measurement is being performed the display will look similar to the following graphic nti g B1Bi Hz 2 5Bi dB 118 81 deg p helt 1 1 Hz 581 dB 11 deg i 4 NI LL 1 _ Measuring Hz 22 85 Hz div 228 5 Hz 1 0 47 TrHzT3 DCILT 3B dB div 3B dB div EXIT 3 dB ref 3 dB ref When the measurement is complete the display will look similar to the follow ing graphic 3 8 NOTE Tutorials Tutorial 1 Jitter Transfer Measurements Jitter Transfer Plot STH Lh 18 m i H Bl E 1 4 a E a Ci Lulu Laluu l 7 lE Modulation Frequency Hz CONT Colored boxes are displayed on the measured data points Green box data passed within transfer specification template e R
101. ansfer measurement uncertainties 4 10 transfer menu map 4 4 transfer mode 1 5 transfer results 3 12 transfer tutorial 3 3 transfer tutorial measure 3 8 transfer tutorial measurement conditions 3 6 waveform verifying 3 51 K keyboard 4 47 L line cords 2 15 line power requirements 2 13 LIST TRNSFER function 3 14 load the personality 2 45 LOAD_TEMPLATE commands 5 15 low pass filters 2 10 M mainframe display 2 7 manually loading personality 4 17 MARGIN command 5 18 margin test 3 25 margin testing description 4 12 markers 3 44 match delay between channels 4 31 measure devices without recovered clock output 3 31 measure margin 3 25 measurement accuracy jitter generation 4 15 conditions high sensitivity 3 37 diagnostic 3 39 3 43 generation and output 3 37 jitter in time domain 3 45 jitter tolerance 3 17 3 22 jitter transfer 3 3 3 8 regenerators 3 15 results jitter generation 3 38 results printing and plotting 4 49 results tolerance 3 29 setup and results storage 4 45 uncertainties 4 10 uncertainties jitter tolerance 4 13 measurement conditions transfer 3 6 memory card 4 38 4 41 memory card battery 4 42 duplicating 4 43 files listing 4 18 initializing or formatting 4 42 menu and softkey overview 1 3 MENU key 1 3 menu maps 4 3 menus calibration 4 29 diagnostic measurements 4 7 jitter generation 4 6 jitter tolerance 4 5 jitter transfer 4
102. arated by commas m o nez jc m i e iO 5 29 5 mgeuomoo sm lt CUSTOM The CUSTOM command string defines the custom template Values of Program Variables Variable Data Type Value Command string CUSTOM Rpts floating point array of 28 see below rows and 4 columns Response string DONE or ERROR a ERROR is returned if any positive jitter frequency is outside the clock source FM frequency range or if any jitter amplitude is lt 0 025 or gt 100 5 10 Example Programming Programming Although Param is not used for this command an array of values Rpts must be sent before sending the command For each of the 28 points in the template send e jitter frequency 5 to 20E6 Hz If the frequency is zero or negative the point is skipped without an error e Jitter amplitude unit intervals peak to peak zero zero template consists of 28 points If the points are sent with non decreasing frequency the template editor can be used to modify them OUTPUT Mta PROG NUMB Rpts FOR Point 1 28 Must send all 28 rows OUTPUT Mta Jitfreq Point Jitampl Point 0 0 EXT Poin OUTPUT Mta OUTPUT Mta PROG STR Command CUSTOM OUTPUT Mta PROG WAIT ENTER Mta A OUTPUT Mta PROG STR Response ENTER Mta Response OUTPUT Mta PROG ST
103. ation jitter amplitude adjusted flag from calibration Jitter transfer AVERAGEFLAG AVERAGE number of sweeps GAIN TRANSFER_FC limit line type OC 3 OC 12 OC 48 OC 192 STM 1 STM 4 STM 16 STM 64 or OFF Jitter tolerance TOLMODE BERTHRS MARGIN margin limits based on calibration Jitter generation GENFC1 GENSWEEPS Output jitter OUTFCI OUTFC2 OUTSWEEPS The following parameters are NOT saved SEARCH ONIOFF Search Factor Sensitivity mode for jitter generation and output measurements 5 17 Example Programming Programming MARGIN The MARGIN command string sets the jitter amplitude used in jitter tolerance testing relative to the current template For example a margin of 25 sets the jitter amplitude 25 higher than the value specified by the template A margin of 10 sets it 10 lower than the value specified by the template Values of Program Variables Variable Data Type Value Command string MARGIN Param floating point number 99 9 to 50096 Response string DONE or ERROR a The calibration determines the actual margin range performed the range is 99 9 to 500 If no calibration has been b ERROR is returned if Param is outside the allowed rang TPUT TPUT TPUT ER M TPUT TER M TPUT TPUT TER M TPUT a PROG NUMB Param 25 6 a PROG STR Command MARGIN a PROG WAIT AS a PROG STR Response Response a PROG STAT CONT a PROG WAIT AS a
104. ation and output jitter are measurements which determine the amount of jitter a component or system adds to an input data signal Output jitter measurements are almost identical to jitter generation measure ments The only difference is that the frequency position of the software high pass filter is set for two values The measurement process is as follows The jitter modulation source is disabled keeping the data jitter free The jitter free data coming from the error performance analyzer is routed to the DUT The DUT output clock signal is received and measured by the 71501D Because this is essentially a noise measurement it is defined over a specific bandwidth The bandwidth limiting process is achieved in two stages a The signal is sent through a hardware bandpass filter centered at the data rate frequency By passing the signal through the hardware filter the high end of the jitter spectrum is determined b The signal is then demodulated to extract the jitter modulation The baseband jitter is passed through a user defined software filter to reject the low frequency spectrum d Several traces of the intrinsic jitter are recorded The peak to peak ex tremes of the signal are monitored to yield the required measurement of peak to peak and RMS jitter Recovered Recovered Clock Clock 5 Agilent Clock Pattern Device N1015A Source Generator pid Modulation est Test Set Agilent 71501D Jitter
105. ay need to perform an analysis over a frequency range that is narrower than that provided by the default test setup You can achieve this characterization by generating a custom template to define the test over the region of interest For instance if the jitter transfer function exhibits some peaking you can alter the test to zoom in on the region of peaking This section includes information on e Loading a template e Saving a template e Creating a custom template e Using data rates other than 155 Mb s 622 Mb s 2488 Mb s or 9953 Mb s Creating custom jitter transfer specifications If you save a template after performing the Calibration Input the calibration data is stored with the template The calibration data consists of the jitter source output level needed to produce the template jitter level at each jitter frequency The calibration will be valid as long as the clock and jitter sources and interconnections remain the same Saving and reloading a calibrated template can save test time Insert the memory card containing the desired template and possible calibration files into the 70820A card slot Retrieve and load a previously saved custom template by pressing USER Templat Storage After the analyzer reads the card a catalog of the jitter analyzer measurement files on the card will be shown The prefix T_ identifies jitter analyzer mea surement files 3 Select a file by pressing Select 4 21 4 To Save
106. b the units are entered automatically by the analyzer When you are finished entering the value press the softkey again to highlight the on and off functions Pressing the HOLD key deactivates the active function Pressing the HOLD key a second time blanks the right side softkeys Use the lt backspace key to backspace over numbers entered using the data entry keypad Active function area Sebi diagram Trg Cal 5 ns Traces CLE OUT BIT INTUL Function selected pud change DELAY eyet ltr Markers E Masks Bs JB ps div Tri Chi Mass 50 mU div CLERR Storage 1BA mU ref DISPLAY Analyzer s Setup Menu 1 4 NOTE Jitter Transfer Mode Introduction Analysis with the Agilent 71501D Jitter Analysis with the 71501D The jitter personality must first be loaded as described in Chapter 2 Installation The jitter analyzer can be operated in the following modes Displays a jitter transfer plot or list of the measured output jitter of the device under test divided by the input jitter versus the jitter frequency Jitter Transfer Plot 5TH E c E X Transfer LI up rara rii prius i ci dE S LE d Modulation Frequency He CONT 1 5 Introduction Analysis with the Agilent 71501D Jitter Tolerance Displays the
107. b s 100 10 1 o 0 01 cr 1 01 1 02 1 03 1 04 1 05 1 E 06 1 07 Jitter Frequency Hz E4422B Capability 622 Mb s 0 1 0 01 4 1 E 01 1 02 1 E 03 1 E 04 1 05 1 E 06 1 E 07 Jitter Frequency Hz Maximum Jitter Minimum Jitter OC 3 Mask STM 1 Mask Maximum Jitter Minimum Jitter OC 12 Mask STM 4 Mask 6 18 Specifications and Characteristics Jitter Modulation Capabilities of 71501D System Configurations 4422 Capability 1 1 99 Gb s 100 o laximum Jitter Minimum Jitter Jitter Amplitude UI pp o 0 01 4 1 01 1 02 1 03 1 04 1 05 1 06 1 07 1 08 Jitter Frequency Hz E4422B Capability 2488 Mb s 100
108. b s 100 Maximum Jitter Minimum Jitter OC 48 Mask STM 16 Mask 0 1 0 01 1 01 1 02 1 03 1 04 1 05 1 06 1 07 1 08 Jitter Frequency Hz 6 22 Specifications and Characteristics Jitter Modulation Capabilities of 71501D System Configurations Declaration of Conformity DECLARATION OF CONFORMITY according to ISO IEC Guide 22 and EN 45014 Manufacturer s Name Hewlett Packard Co Manufacturer s Address Microwave Instruments Division 1400 Fountaingrove Parkway Santa Rosa CA 95403 1799 USA declares that the product Product Name Microwave Transition Analyzer Model Number HP 71500A HP 70820A Product Options This declaration covers all options of the above products conforms to the following Product specifications Safety 348 1978 HD 401 51 1981 CAN CSA C22 2 No 231 Series M 89 EMC CISPR 11 1990 EN 55011 1991 Group 1 Class A IEC 801 2 1984 EN 50082 1 1992 4 kV CD 8 kV AD IEC 801 3 1984 EN 50082 1 1992 3 V m 27 500 MHz IEC 801 4 1988 EN 50082 1 1992 0 5 kV Sig Lines 1 kV Power Lines IEC 555 2 1982 A1 1985 EN 60555 2 1987 IEC 555 3 1982 A1 1990 EN 60555 3 1987 A1 1991 Supplementary Information The product herewith complies with the r
109. ber 0955 0969 5 MHz noise high frequency corner at 622 Mb s part number 0955 0732 20 MHz noise high frequency corner at 2488 Mb s part number 0955 0731 80 MHz noise high frequency corner at 9923 Mb s part number 0955 0970 3 36 NOTE Tutorials Tutorial 3 Jitter Generation and Output 5 Set the measurement sensitivity to high or normal If your 71501D system meets the following conditions the high sensitivity mode is automatically selected N1015A test set with a 10 GHz modulator is in the equipment configuration Clock source frequency is set in the range of 9 8 to 18 GHz Input and output clock rates are the same MUX DEMUX is set to OFF e f your 71501D system does not meet all of the conditions listed above you will not be able to select the high sensitivity mode The normal sensitivity mode will be automatically selected You can select and de select the sensitivity mode manually by pressing Jitter Generat HISENS ON OFF for jitter generation or pressing Output Jitter HISENS ON OFF for output jitter The high sensitivity mode allows measurements with a lower noise floor See the following examples of typical performance High sensitivity mode at 10 Gb s has 0 02 UI peak to peak noise floor Normal sensitivity mode at 10 Gb s has 0 06 UI peak to peak noise floor Step 3 Perform Jitter Generation or Output Jitter Measurement Perform the jitter measurement e Ifyou are making a jitter generation m
110. bility It can be used to check the rejection of the bandpass fil ters used on the 70820A inputs If the filter stopbands provide adequate attenuation of the clock signal harmonics a sinusoid is displayed Significant distortions can indicate inadequate harmonic rejection which decreases the precision of the jitter measurements Good jitter transfer measurements require the harmonics be suppressed to at least 30 dBc Filter stopband rejection can usually be improved by cascading the bandpass filters with lowpass filters whose cutoff frequency is below that at which the bandpass filters exhibit spurious passbands 3 52 Check for Error when Loading the Personality Tutorials Troubleshooting the Jitter Analyzer System The Diagnos menu provides four ways of viewing jittered clock signals You can use these views to verify the connections signals and settings are correct before you begin to make jitter measurements such as those described in the following tutorials If clock signals are connected to both inputs of the 70820 the descriptions apply to both traces The top trace corresponds to input 1 the bottom trace to input 2 The following table shows the minimum required connections to the inputs of the 70820A Table 3 1 Required Connections to the Inputs of the 70820A 70820A Measurement Channel 1 top input Channel 2 bottom input Setup CAL INPUT None required Pattern generator clock out or clo
111. ble with the 71501D 2 37 Installation Step 3 Set Up the Equipment without an N1015A JITTER 10 MHz Ref In Front Output Front MODULATION Sync Out 10 MHz Ref Rear Sync In Out MICROWAVE TRANSITION ANALYZER 91 MSIB Out MSIB In ig em PATTERN GENERATOR ERROR DETECTOR MSIB Out o e ec 8 MSIB In i 10 MHz Ref In GPIB CLOCK SOURCE FM In 10 MHz Ref Out rmmstol 2 38 Installation Step 3 Set Up the Equipment without an N1015A Table 2 13 Connections for Jitter Tolerance with No Modulation Test Set panel Make This Instrument Connection TO This Instrument Jitter Modulation SYNC OUT TO Microwave Transition Analyzer SYNC IN rear panel Jitter Modulation SIGNAL TO Clock Source FM IN EXT 1 INPUT front panel for E4422B Jitter Modulation GPIB rear panel TO GPIB INTERCONNECT rear panel Clock Source Stand Alone RF OUTPUT TO Pattern Generator CLOCK IN Clock Source Modular CLOCK OUT Clock Source 10 MHz REF OUT rear panel TO Jitter Modulation 10 MHz REF IN rear panel Clock Source Stand Alone GPIB rear panel TO GPIB INTERCONNECT rear panel Microwave Transition Analyzer 10 MHz RF OUT TO Clock Source 10 MHz REF
112. cations Tutorial 1 Jitter Transfer Measurements 3 3 Tutorial 2 Jitter Tolerance Measurements 3 17 Tutorial 3 Jitter Generation and Output 3 32 Tutorial 4 Diagnostic Measurements 3 39 Troubleshooting the Jitter Analyzer System 3 49 The tutorials are based on the sequential steps shown below Connect the equipment Configure measurement conditions a Select the template b Make any necessary changes to the template c Set up the error performance instrument s Perform a calibration Save the template and calibration information Measure the device response Change measurement conditions if necessary Print the displayed measurement results There are two menus connected to the USER key When you press the key multiple times the displayed menu toggles between the jitter analyzer and the Instrument BASIC menu 3 2 Agilent 33250A Modulation Source Tutorials Tutorial 1 Jitter Transfer Measurements Tutorial 1 Jitter Transfer Measurements Jitter transfer is typically used to describe how a clock recovery module or repeater locks and tracks data as the data has jitter placed upon it The mea surement is the ratio of the jitter on the output of the device or system com pared to the jitter on the data going into the device The following diagram shows signal flow for the test process BPF Bandpass Fllter Recovered Clock Agilent 71501D Jitter Analyzer Pattern Modulation Generator Test Set Clock
113. ck out Jitter Trnsfer Recovered clock of test Pattern generator clock out or device clock out Jitter Generat or Output Jitter Recovered clock of test None required for normal device sensitivity mode Pattern generator clock for high sensitivity mode Jitter Tolrnce None required None required The four views of the clock signal have limitations especially at high jitter fre quencies and high jitter levels Refer to Specifications and Characteristics on page 6 1 for more information Check to see if the 71501D shows the following error message during the pro cess of loading the jitter personality Select code in use by RF source Error 151 interface in use If the message does appear press MENU Config RF Source None and then reload the personality 3 53 Tutorials Troubleshooting the Jitter Analyzer System 3 54 Reference Reference Reference Reference In this chapter you will find information that is helpful for understanding the jitter measurement system Besides showing the jitter menus this chapter also explains the jitter applications some components of system configuration and measurement conditions and describes the calibrations file storage and hardcopy possibilities You will find information on the following topics Menu Maps 4 3 Jitter Measurements 4 8 Analyzer System Configuration and Setup 4 17 Calibrating the Analyzer 4 27 Memory Cards Disks and RAM 4 38 Print or P
114. clock rate as the previously selected SONET standard Follow the procedure described in To Create a Custom Jitter Transfer Specification on page 4 26 3 Calibrate the system Save the template using the procedure To Save a File on page 4 46 4 25 To Create a Custom Jitter Transfer Specification To Restore the Factory Instrument Preset Reference Analyzer System Configuration and Setup For margin testing or to create a custom specification you can set the magni tude and the location of the corner frequency of the specification limit The 71501D enables you to customize the jitter transfer specification by adjusting the corner roll off frequency and the magnitude of the jitter gain the height of the mask before the corner frequency Change the corner roll off frequency of the specification by pressing Jitter Trnsfer CORNER FREQ Use the knob step keys or keypad to adjust the roll off Values between 5 0 Hz and 20 0 MHz are allowed Change the magnitude height of the transfer specification by pressing Jitter Trnsfer Gain Amplitude Use the knob step keys or keypad to adjust the roll off Values between 15 dB and 30 dB are allowed The default is 0 1 dB Restore the factory instrument preset by pressing MENU gt page 1 of 2 gt States gt more 1 of 2 gt preset FACIUSR FAC 4 26 System Calibration Reference Calibrating the Analyzer Calibrating the Analyzer This section ex
115. command CLEAR 7 the 70841B pattern generator must be on row zero The remote program must send a specific device clear such as CLEAR 718 to the pattern generator before sending the general device clear com mand Sending the specific device clear before sending a general device clear keeps the bus from locking up Instead of sending the specific device clear almost any pattern generator SCPI command such as source2 voltage 0 5 be sent to the pattern genera tor These commands execute as expected and prevent the bus from hanging when the remote computer sends a general device clear 5 5 Interaction between the Jitter Application and the Remote Computer Programming Programming Remote Computer Set values of Param string or numeric and Rpts as required by command to be issued Set Command Wait for command completion by using PROG WAIT or PROG STAT When jitter application has paused read results from Response Rnoise and Rpts as appropriate for the command Allow jitter application to resume operation by sending PROG STAT CONT Wait for completion of variable clearing by using PROG WAIT or PROG STAT Allow jitter application to resume operation by sending PROG STAT CONT Jitter Application While waiting for a menu key press frequently checks to see if Command has become non NULL Parse command fetch parameter values execute command PAUSE Clear variables in order Rnoise R
116. d 5 14 getting started 2 2 GPIB disk drives 4 40 GPIB general device clear 5 5 H hardware configuration 4 37 hardware response traces 4 34 HOLD key 1 4 Index I IF calibration 4 30 IF calibration data traces viewing 4 33 INCLOCKFREQ command 5 14 initialize or format a memory card 4 42 instrument returning for service 2 55 instrument calibration 4 29 instrument connections transfer and generation 2 33 2 36 instrument preset restore to factory settings 3 49 4 26 internal RAM 4 39 ISM1 A 2 18 J jitter analysis diagnostic measurement 3 39 analyzer reference 4 2 analyzer tutorials 3 2 configurations 2 2 2 7 generation and output measurement 3 37 generation and output tutorial 3 32 generation configuration 2 33 2 36 generation description 4 14 generation measurement results 3 38 generation menu map 4 6 generation sensitivity modes 4 15 generation with no clock output 4 15 measurements reference 4 8 menu maps 4 3 modulation 2 7 output and generation mode 1 6 personality card 2 7 personality loading 2 45 4 17 spectra 3 43 spectrum viewing 3 44 tolerance description 4 11 tolerance devices with no clock output 4 12 tolerance equipment 3 18 tolerance gating time 4 13 tolerance measurement uncertainties 4 13 tolerance menu map 4 5 tolerance mode 1 6 tolerance tutorial 3 17 tolerance measurement conditions 3 20 Index 3 Index transfer description 4 9 tr
117. d 70842A B con nect the test equipment as shown in Test Setup 2 1 on page 2 17 If the device test frequency is outside the ranges listed above use a configura tion that does not include the modulation test set For stand alone error performance analyzers 70843A B C and 86130A connect the test equipment as shown in Test Setup 2 6 on page 2 34 For modular error performance analyzers 70841A B and 70842A B con nect the test equipment as shown in Test Setup 2 5 on page 2 31 If you reconfigure the equipment after the jitter personality has been loaded refer to Rescan the Equipment after Reconfiguring on page 4 19 To prevent damage to the 70820A microwave transition analyzer always have either a bandpass filter or a dc block connected to the analyzer input channels Make sure that the bandpass filter matches the frequency range that you will be measuring Connect filters to the 70820A inputs e Ifyou are performing SONET SDH testing with the 86130A or 71612 70843 3 4 NOTE NOTE CAUTION Tutorials Tutorial 1 Jitter Transfer Measurements combination of instruments use these filters 2 488 Gb s bandpass Opt 420 plus 4 GHz low pass Opt 435 2 66 Gb s bandpass Opt 480 plus 4 GHz low pass Opt 435 622 Mb s bandpass Opt 410 plus 800 MHz low pass Opt 412 In the testing conditions mentioned the lowpass filter is required to prevent the higher clock harmonics emanating from the
118. d downward and toward the instrument Make sure the card is fully inserted into the card slot Switch on the power to all of the equipment Switch on the power to the 70820A last The start up process takes about 6 minutes If you have reconfigured the equipment after the jitter personality has been loaded refer to Rescan the Equipment after Reconfiguring on page 4 19 Select a template by pressing Setup INtmplt then select one of the templates OC 192 OC 48 OC 12 OC 3 or sdh Ifyou want to review the test point frequencies and levels for a template that you selected press Setup Edit Template To adjust the measurement con ditions specified in the available templates refer to Creating and Editing Templates on page 4 21 e Ifthe data is at an FEC rate or is at a rate other than 155 Mb s 622 Mb s 2488 Mb s 9953 Mb s select the desired input data rate by pressing Nclock FREQ and entering the data rate for OC48FEC enter 2 66606 Gb s for OC192FEC enter 10 7092 Gb s e Ifthe device under test has different data rates between the input and out put the 71501D must be in the MUX DEMUX mode Refer to To Use Differ ent Input Output Data Rates on page 4 24 The clock source and error performance analyzer selected must be capable of operating at the input data rate you specify The signal level from the pattern generator clock out to channel 2 of the 70820A must be 0 5 to 1 0 V peak to peak The signal level from th
119. d to the frequency reference in the 70820 Verify the clock source and the 70820 frequency reference are phase locked via their rear panel 10 MHz reference connectors Also verify the frequency entered on the Setup menu Inclk FREQ function is exact If MUX DMX is on the Setup menu OUTclk FREQ function must also be set precisely Use the 70820 menus to measure the magnitude of the jitter displayed in the time domain by pressing MENU Measure update CONT PK PK The jitter in Ul is will be displayed The frequency spectrum of the clock signal the carrier and jitter sidebands is displayed At low jitter levels the carrier is the highest peak in the spectrum with a single sideband in each side As the jitter level is increased the magni tude of the first pair of sidebands increases and additional sidebands appear At high jitter levels there are so many sidebands it s difficult to see the carrier The amplitude of the carrier and its sidebands increase and decrease accord ing to Bessel functions with modulation index that is jitter level as argu ment The waveform of the phase modulated clock is displayed Disconnect the cable between the synthesized function sweep generator output and the clock source FM input to view the clock waveform undistorted by phase mod ulation At high modulation levels the waveform may appear very distorted When no filters are present at the 70820A inputs this view provides an oscillo scope like capa
120. disable this feature and maintain a constant span press 3 46 Tutorials Tutorial 4 Diagnostic Measurements AUTODIAG ON OFF OFF 16 To display a single channel press MENU gt TRACES 17 Normally CHANNEL 1 is displayed as trace 4 and CHANNEL 2 is displayed as trace 2 TR2 To turn off CHANNEL 2 press Select gt TR2 gt display on off off gt USER gt USER View the Clock Waveform 18 To view the jittered clock waveform in the time domain press CLOCK WAVEFRM Notice how the clock period varies during the measurement Hiiti 11 9B1 us 333 8 nV m Setup Heiti P 57HH83 us 997 9 mU pk pk 1 9972 SPECTRA vie PRL TETUR f Ns s LU EDAD es Tolrnce Y V V V V SPECTRR 4 Jitter CLOCK Generat D A AJA A A WAWEF RM Qut put I JITTER mex TU CU V gU Ev V V V YYY v JITTER D Bs 200 565 pardi FL Trd Che Tr4 Cht Mass mU div mU div RUTDIRG Starage B ref HV ref ON OFF Viewing the Clock Waveform 19 Change the jitter rate and jitter amplitude by pressing JITTER FREQ gt new value ENTER JITTER AMPL gt new value ENTER 3 47 20 Tutorials Tutorial 4 Diagnostic Measurements As the jitter frequency is changed the analyzer adjusts the time span for the optimum display Low jitter rates and or amplitudes provide the most mean ingful measure
121. e device under test output to either the N1015A or channel 1 of the 70820A must be 2 to 4 dBm 0 5 to 1V peak to peak If signals exceed this level use the 6 dB attenuator to reduce voltage levels 3 20 Tutorials Tutorial 2 Jitter Tolerance Measurements Step 3 Perform a Calibration Calibration should be performed before making jitter transfer and jitter tolerance tests If the template you are using was previously saved with calibration data the calibration data is automatically loaded with the template and no calibration is required 1 Press USER Setup CAL INPUT 2 The calibration can take up to six minutes to execute When the calibration is finished the display will be similar to the following graphic 3 To return to the Main menu press CONT LII Fimplitucde 18 UNS 1 25 Modulation Frequency HZ Input Temp late Calibration Plot OC 4B LE Example Jitter Tolerance Calibration Plot CONT 3 21 Stand Alone Error Performance Analyzer Modular Error Detector Tutorials Tutorial 2 Jitter Tolerance Measurements Step 4 Perform the Jitter Tolerance Measurement To set the error criteria for a jitter tolerance measurement a Check for the existence of any errored bits by pressing Jitter Tolerance Errors BER Errors this is the default setting b Measure the bit error rate by pressing Errors BER BER Select the BER threshold by pressing B
122. e loaded into nonvolatile memory at the factory You can prevent the use of RF correction factors during mea surements Turn off RF correction by pressing MENU 1 of 2 RF corr ONIOFF OFF 4 30 To Delay a Channel Reference Calibrating the Analyzer Match Delay Between Channels Significant delays can occur between the signals on channel 1 and channel 2 when the electrical lengths of external cabling varies This results in a phase Offset between the two channels The microwave transition analyzer module offers the capability to add delay to either channel 1 or channel 2 The following figure shows added delay on channel 2 RF carr Pulsgen ON OFF Tuser Measure Table Analyze Calib States Trt Cht Bos Tre Che Jeorr chan sken IF jJcalib ser TEST ial UB psrdlv signal Page mU div m div caf B QW ref Trace 2 delayed relative to trace 1 Use the AUTO SKEW softkey to automatically compensate the delay on chan nel 2 Automatic skewing assumes two equal phase signals input to channels 1 and 2 If measurements are to be performed at multiple frequencies it is rec ommended that the AUTO SKEW function be performed first at a low fre quency and then at higher frequencies to ensure better resolution Delay can be manually compensated using the CHAN2 SKEW softkey For convenience the SEC DIV softkey is provided so that
123. e power to the 70820A last The start up process takes about 6 minutes If you reconfigure the equipment after the jitter personality has been loaded refer to Rescan the Equipment after Reconfiguring on page 4 19 Select a template by pressing Setup INtmplt then select one of the templates OC 192 OC 48 OC 12 OC 3 or sdh Ifyou want to review the test point frequencies and levels for a template that you selected press Setup Edit Template To adjust the measurement con ditions specified in the available templates refer to Creating and Editing Templates on page 4 21 e Ifthe data is at an FEC rate or is at a rate other than 155 Mb s 622 Mb s 2488 Mb s 9953 Mb s select the desired input data rate by pressing Nclock FREQ and entering the data rate for OC48FEC enter 2 66606 Gb s for OC192FEC enter 10 7092 Gb s e Ifthe device under test has different data rates between the input and out put the 71501D must be in the MUX DEMUX mode Refer to To Use Differ ent Input Output Data Rates on page 4 24 The clock source and error performance analyzer selected must be capable of operating at the input data rate you specify The signal level from the pattern generator clock out to channel 2 of the 70820A must be 0 5 to 1 0 V peak to peak The signal level from the device under test output to either the N1015A or channel 1 of the 70820A must be 2 to 4 dBm 0 5 to 1V peak to peak If signals exceed this level use the 6
124. e product in a safe condition This is a Safety Class 1 Product provided with a protective earthing ground incorporated in the power cord The mains plug shall only be inserted in a socket outlet provided with a protective earth contact Any interruption of the protective conductor inside or outside of the instrument is likely to make the instrument dangerous Intentional interruption is prohibited No operator serviceable parts inside Refer servicing to qualified service personnel To prevent electrical shock do not remove covers For continued protection against fire hazard replace line fuse only with same type and ratings FUSE METRIC 3 15A 250V TD FE UL REC Agilent part number 2110 1124 The use of other fuses or materials is prohibited Always use the three prong AC power cord supplied with this product Failure to ensure adequate earth grounding by not using this cord may cause product damage This product is designed for use in INSTALLATION CATEGORY II and POLLUTION DEGREE 2 per IEC 61010 1 and 664 respectively Ventilation Requirements When installing the product in a cabinet the convection into and out of the product must not be restricted The ambient temperature outside the cabinet must be less than the maximum operating temperature of the product by 4 C for every 100 watts dissipated in the cabinet If the total power dissipated in the cabinet is greater than 800 watts then forced convection must be used 2 12
125. easurement press MEASURE GENERAT If you are making an output jitter measurement press MEASURE OUT JIT The measured result is the integrated phase noise in the band between the software high pass filter corner frequency and the hardware filter bandwidth 3 37 Tutorials Tutorial 3 Jitter Generation and Output pk pk 5 9992 TTER GENERATION RESULTS E Cutoff Frequency 18 HBH kHz 35 H3E BH3 UI p p 4 2076 03 UI CONT Ed Example Tabular Results of the Jitter Generation Measurement NOTE Occasionally the high sensitivity mode may fail If this happens the measurement will default to the normal sensitivity mode The measurement results screen will show the mode used during the measurement Change the Number of Sweeps 2 Change the number of traces used in the measurement e Ifyou are making a jitter generation measurement press GENERAT SWEEPS tt of sweeps ENTER e f you are making an output jitter measurement press OUT JIT SWEEPS of sweeps ENTER The number of sweeps to be averaged can be entered using the knob step keys or numeric keypad A larger value gives more accuracy but increases the data acquisition time 3 Measure the jitter using the new sweep value Ifyou are making a jitter generation measurement press MEASURE GEN ERAT e f you are making an output jitter measur
126. easurements NOTE Gating time changes to the error detector are not saved The calibration data is only valid for the specific signal generator and synthesizer function generator used in the measurement For a list of the parameters that are saved as part of the template refer to SAVE_TEMPLATE on page 5 27 Jitter Tolerance for Devices without a Recovered Clock Output If the device being tested has no clock output perform the jitter tolerance measurement by connecting the device under test as if a bit error rate test were being performed independent of jitter For example bit error rate tests are often performed on devices with only a data output In these cases the clock signal from the pattern generator can be connected directly to the clock input of the error detector 3 31 Tutorials Tutorial 3 Jitter Generation and Output Tutorial 3 Jitter Generation and Output Jitter generation and output jitter are measurements which determine the amount of jitter a component or system adds to an input data signal In this measurement the jitter source is disabled so no jitter modulation is applied to the data The jitter free data from the error performance anlayzer is routed to the device under test DUT and the DUT output clock signal is received and measured by the 71501D The following diagram shows the signal flow for the measurement process Clock Source Recovered Recovered Clock Clock Agilent N1015
127. ed by its pattern Set a Reference Line Select a test reference line by pressing tolrnce options OC 48 The displayed reference line does not affect the pass fail status of the test The actual jitter test levels are determined by the input template Perform a Tolerance Measurement Perform a jitter tolerance measurement by pressing MEASURE TOLRNCE You could press PAUSE ON before you press MEASURE TOLRNCE so the 70820A pauses between setting the jitter frequency and taking the measurement data This pause allows you to change conditions on the test device before each measurement For example you may need to ensure that the device stays phase locked Pressing PAUSE OFF returns the 70820A to automatically setting the jitter frequency and immediately taking measurement data Perform Clock and Data Alignment and Set the Gating Time The analyzer prompts you to perform a clock and data alignment and to set the gating time Perform a clock and data alignment and set the gating time to measure at least 100 errored bits For example with the data rate at 2488 Mb s and the BER threshold at 1x10 set the gating time to 41 seconds Refer to Gating Time for Jitter Tolerance Measurements on page 4 13 for information on calculating the gating time for other conditions 3 23 Tutorials Tutorial 2 Jitter Tolerance Measurements Stand Alone Error Performance Analyzer Modular Error Detector NOTE d e f If you a
128. ed x data failed exceeds transfer specification Press Cont to return to the trace display Change the Number of Sweeps To change the number of measurements made at each frequency press AVERAGE SWEEPS then enter the number of sweeps and press ENTER The number of sweeps to be averaged can be entered using the knob step keys or numeric keypad A larger value increases measurement repeatability and reduces measurement uncertainty but increases the data acquisition time For measurements at jitter frequencies above 1 MHz an averaging factor of 10 is automatically implemented To activate the Average function so the displayed data is the average of data measured during a number of sweeps press average ON Change the Corner Frequency The jitter transfer acceptance specification or output template may be adjusted by changing the corner frequency and the gain amplitude 3 9 Tutorials Tutorial 1 Jitter Transfer Measurements The corner frequency is the point at which the transfer specification 20 dB decade rolloff begins Standard input templates select the corner frequency specified in the standard The minimum and maximum values for transfer cor ner frequency are limited by the clock source selected 5 Set the corner frequency to 1 3 MHz by pressing CORNER FREQ gt 1 3 MHz The value can be entered using the knob step keys or numeric keypad It is not necessary to remeasure jitter transfer when the corner frequenc
129. elect the OC X or STM X softkey clock frequency jitter transfer and output jitter parameters are set The jitter magnitude versus jitter frequency template is preset To edit a template or create a custom template refer to Creating and Editing Templates on page 4 21 The clock source and error performance analyzer selected must be capable of operating at the input data rate you specify Adjust the error performance analyzer to the settings for the specific measurement application e Ifthe error detector and pattern generator are part of a stand alone instru ment adjust the values from the front panel of the error performance ana lyzer e Ifthe error detector and pattern generator are modular instruments follow the remaining steps in this chapter a On the 70004A press DISPLAY and then the right side NEXT INSTR soft key 2 49 Installation Step 6 Select Template and Measurement Conditions If several instruments are in the system you may have to press NEXT INSTR several times to display the 70842A B or 70843A B C error detector b Adjust the error detector settings through the 70004A softkeys select HP 7 B42B ERROR DETECTOR Main Results 8 17 B 1 THR pattern UTOn RN Errar Count select Delta Errar Count art page Errar Ratio HRSHLD Delta Errar Ratio B B3Be a9 dat a p Clock Frequency 2 4883 GHz CLK DAT Power Loss Secands apes LIGN Sync Loss Secands
130. ement press MEASURE OUT JIT 3 38 Tutorials Tutorial 4 Diagnostic Measurements Tutorial 4 Diagnostic Measurements For diagnostic purposes the Agilent 71510D has the ability to display the demodulatd or base band jitter spectrum and waveform of a phase modu lated clock signal Also similar to using a high frequency spectrum analyzer and high speed oscilloscope the clock spectrum and waveform can be dis played This measurement useful in understanding and solving jitter related problems What you will learn in this tutorial Configure the system for diagnostic measurements Measure and analyze the demodulated jitter signal in the frequency domain Measure and analyze the demodulated jitter in the time domain Measure and analyze the jittered clock signal in the frequency domain Measure and analyze the jittered clock signal in the time domain e Set arbitrary values for jitter amplitude and jitter frequency 3 39 NOTE NOTE CAUTION Tutorials Tutorial 4 Diagnostic Measurements Step 1 Connect the Equipment The connections for jitter transfer jitter generation and jitter diagnostic are the same Connect the front and rear panel cables in the configuration that matches the device test frequency and your system equipment Determine if the device test frequency is within the following ranges e 2 4 to 3 2 GHz with 20 MHz modulation 71501D options 300 305 e 9 8 to
131. ent Conditions on page 2 49 or Load a Previously Saved Template on page 4 21 2 Calibrate the system by pressing Setup CAL 4 27 CAUTION Error Messages Reference Calibrating the Analyzer The system determines the exact settings for the 33250A so the jitter levels required by the selected template can be generated If the template was saved with calibration data it is automatically loaded with the template and no cali bration is required If the clock frequency the template values or the clock source are changed a new calibration must be performed e Ifthe clock signal is not connected to input 2 of the 70820A or if the modu lation signal is not connected to the clock source errors will occur when a calibration is attempted e During calibration several types of error or warning messages can appear on the display If either of the following two messages appear the input signal to the indicated channel of the 70820A is too large To correct the condition reduce the signal and restart the calibration Error 6211 channel 1 hardware overrange Error 6212 channel 2 hardware overrange Error messages 480 and 490 can also appear These errors normally indicate a condition that does not need to be corrected The calibration routine automatically corrects these conditions as they occur Error 480 Vco fll ool transient error Error 490 Nf pll ool transient error e Some modulation frequencies for
132. ent office Or use the following guidelines e Wrap the instrument in antistatic plastic to reduce the possibility of damage caused by electrostatic discharge Forinstruments weighing less than 54 kg 120 Ib use a double walled cor rugated cardboard carton of 159 kg 350 Ib test strength The carton must be large enough to allow approximately 7 cm 3 inches on all sides of the instrument for packing material and strong enough to accom 2 56 Installation Returning the Instrument for Service modate the weight of the instrument e Surround the equipment with approximately 7 cm 3 inches of packing ma terial to protect the instrument and prevent it from moving in the carton If packing foam is not available the best alternative is S D 240 Air Cap from Sealed Air Corporation Commerce California 90001 Air Cap looks like a plastic sheet filled with air bubbles Use the pink antistatic Air Cap to reduce static electricity Wrapping the instrument several times in this ma terial will protect the instrument and prevent it from moving in the carton 4 Seal the carton with strong nylon adhesive tape 5 Mark the carton FRAGILE HANDLE WITH CARE 6 Retain copies of all shipping papers 2 57 Installation Returning the Instrument for Service 2 58 Tutorials NY fo OQ RO NOTE Tutorials Tutorials Tutorials This chapter contains tutorials for the following jitter system appli
133. equirements of the Low Voltage Directive 73 23 EEC and the EMC Directive 89 336 EEC The HP 70820A Microwave Transition Analyzer was tested in HP 70004A Color Displays Safety qualification tests for these products were performed prior to 1 December 1993 Santa Rosa California USA 28 Dec 1995 Dixofi Browder Quality Manager European Contact Your local Hewlett Packard Sales and Service Office or Hewlett Packard GmbH Departrnent HQ TRE Herrenberger Strasse 130 D 71034 B blingen Germany FAX 49 7031 14 3143 6 23 Specifications and Characteristics Jitter Modulation Capabilities of 71501D System Configurations This is to declare that this system is in conformance with the German Regula tion on Noise Declaration for Machines Laermangabe nach der Maschinen laermrerordnung 3 GSGV Deutschland Notice for Germany Noise Declaration Acoustic Noise Emission Geraeuschemission LpA lt 70 dB LpA 70 dB Operator position am Arbeitsplatz Normal position normaler Betrieb per ISO 7779 nach DIN 45635 t 19 COMPLIANCE This ISM device complies with Canadian ICES 001 C CANADIAN Cet appareil ISM est conforme a la norme NMB du Canada REQUIREMENTS 6 24 Numerics 33250A function generator 2 7 3325A B function generator 2 7 70004A display mainframe 2 7 70311A option H08 2 7 70340A signal generator 2 7 70820A instrument calibration 4 29 70820A microwave transition analyzer 2 7 70843 error performance a
134. ery and a sub sequent concern with jitter transfer Some regenerators have clock recovery but do not have external access to the recovered clock signal Jitter transfer measurements with the 71501D system are made only on clock signals In this scenario the data signal must simulate a clock signal to allow a jitter transfer measurement For example a 10101010 type data signal can simulate a clock signal The jitter transfer measurement results may not be the same as what would occur with a true data pattern This would be true for a device where clock recovery performance is pattern dependent A square wave clock signal goes through one complete cycle over a data bit period Therefore a 10101010 data signal replicates a clock signal at a fre quency equivalent to one half the data rate This procedure requires the 71501D to be in the DMUX or demultiplex mode The procedure is as follows Create a custom or user pattern in the pattern generator e Ifyou are using a stand alone error performance analyzer 86130A enter a pattern 1 0 1 0 1 0 1 0 from the analyzer front panel Ifyou are using a 71603B press the following on the 70004A Menu more 1 2 edit usr pat internal pattern 1 more 1 3 set pat length to 8 Enter 1 0 1 0 1 0 1 0 more 2 3 more 3 3 save pattern internal pattern 1 Ifyou are using a 71612A 70843A press the following on the 70004A Pattern Edit ram internal pattern 1 set pat length to 8 Ente
135. escribed in Chapter 2 Installation MENU press to view menus for the 70820A microwave transition analyzer module Refer to Menu Maps on page 4 3 to learn how to view the pattern generator s menus DISPLAY press to view the menus for the 70004A display 1 3 Introduction Analysis with the Agilent 71501D A softkey with ON and OFF in its label can be used to turn the softkey s func tion on or off To turn the function on press the softkey so ON is underlined To turn the function off press the softkey so OFF is underlined For example an ON or OFF softkey function for MUX DMUXwill be indicated in this manual as MUX DMUX ON A softkey such as ERRORS BER offers you a choice of functions In this case you could choose to count the number of errors by pressing the softkey until ERRORS is underlined or determine the bit error rate by pressing the softkey until BER is under lined For example ERRORS BER BER When some softkeys such as DELAY are pressed the first time only the function will be highlighted as shown in the graphic below The display s active function area shows the value of any activated function To change the value of the func tion use the numeric keys step keys or knob When entering a value using the nu meric keys the entry must be terminated by pressing either one of the units keys such as MHz or if no units are required the ENTER key When adjusting the value using the step keys or kno
136. esponse 10 A 10 TPUT Mta PROG STR Param ON TPUT Mta PROG STR Command PAUSE TPUT Mta PROG WAIT TER Mta A TPUT Mta PROG STR Response ER Mta Response TPUT Mta PROG STAT CONT TPUT Mta PROG WAIT TER Mta A TPUT Mta PROG STAT CONT TPUT Mta PROG STR Command TRANSFER end TRANSFER command TPUT Mta PROG STAT Check IBASIC status ENTER Mta Status IF Status PAUS THEN OUTPUT Mta PROG STAT CONT if PAUSED send CONTINUE ceo 5 OoO oomoomomooocgdc EC 5 24 LOOP Programming Programming Need LOOP if PAUSE ON OUTPUT Mta PROG WAIT Wait fo Fetch Re will ge ENTER M Wait for N GPIB han U a OUTPUT M CONTINUE measurement at this frequency END LOOP OUTPUT Mta PROG NUMB Rpts Fetch numeric result array jitter app pause ENTER Mta A GPIB hangs until done returns 1 OUTPUT Mta PROG STR Response sponse ENTER Mta Response EXIT IF Response PAUSE DONE at end of measurement nsients are past ensure DUT PLL s are ok then a PROG STAT CONT a USING UTPUT Mta PROG STAT CONT Acknowledge result receipt UTPUT Mta PROG WAIT second jitter app pause TER Mta A a gs until done returns 1 TPUT Mta PROG STAT CONT CONTINUE jitter app operation
137. evice test frequency is outside the ranges listed above use a configura tion that does not include the modulation test set e For stand alone error performance analyzers 70843A B C and 86130A connect the test equipment as shown in Test Setup 2 8 on page 2 40 For modular error performance analyzers 70841A B and 70842A B con nect the test equipment as shown in Test Setup 2 7 on page 2 37 If you reconfigure the equipment after the jitter personality has been loaded refer to Rescan the Equipment after Reconfiguring on page 4 19 To prevent damage to the 70820A microwave transition analyzer always have either a bandpass filter or a dc block connected to the analyzer input channels Make sure that the bandpass filter matches the frequency range that you will be measuring Connect filters to the 70820A inputs e Ifyou are performing SONET SDH testing with the 86130A or 71612 70843 combination of instruments use these filters 2 488 Gb s bandpass Opt 420 plus 4 GHz low pass Opt 435 2 66 Gb s bandpass Opt 430 plus 4 GHz low pass Opt 435 622 Mb s bandpass Opt 410 plus 800 MHz low pass Opt 412 3 18 NOTE NOTE NOTE CAUTION Tutorials Tutorial 2 Jitter Tolerance Measurements In the testing conditions mentioned the lowpass filter is required to prevent the higher clock harmonics emanating from the pattern generator clock output e Ifyou are performing SONET SDH testing with
138. example jitter produce spurious side bands on the output signal from some clock sources These sidebands may cause measurement or calibration errors 70311A Option H08 modulation frequencies within 40 kHz of an integer multiple of 200 kHz 83752 Modulation frequency near 3 98 MHz e When the 33250A output voltage and frequency are changed a switching transient can cause the clock source frequency synthesizer to momentarily unlock The jitter application ensures that phase lock is re established be fore proceeding with a measurement It also clears the error condition re ported by the clock source However sometimes an error message is displayed such as on the 70340A 712 slave at 0 23 Frequency loop went out of lock Or the ERR LED on the 70311A Option H08 may light 4 28 Calibration Menu Calibr Reference Calibrating the Analyzer Agilent 70820A Instrument Calibration You should perform a weekly calibration on the 70820A To access features available in the 70820A menus press MENU Use the Calibration menu to perform the following tasks e Calibrate the IF Match delay between channels e Initiate an instrument self test routine e Turn off RF correction e Verify the calibrator signal Pulsgen RF correction drier Xaeror Heasure Table Analyzef ation menu States Tuser Rae to a channel chan Jemen nnn rne eren feeder here Mene rrr Me Reiner ON
139. gure the printer in listen only mode on the GPIB To configure the printer via the MSIB use the MSIB COLUMN and MSIB ROW softkeys to enter the printer address To select the type of printer used press lt printer config Use the softkeys along the right side of the display to select the printer type 4 Select the print option by pressing 5 lt copy options COPY IS PRT PLT PRT Create the print by pressing USER PRINT 4 49 To Create a Plot Reference Print or Plot Measurement Results Connect the plotter to the display via a GPIB cable Be sure to connect the GPIB to the display s connector not to the connector on the 70820A microwave transition analyzer module The first time the plotter is used enter the plotter type and address by pressing DISPLAY Hard Copy plotter address GPIB TLK LSN to configure the plotter in talk listen mode on the GPIB or GPIB L ONLY to configure the plotter in listen only mode on the GPIB To configure the plotter via the MSIB use the MSIB COLUMN and MSIB ROW softkeys to enter the plotter address To select the type of plotter used press lt plotter config Use the softkeys along the right side of the display to select the plotter type 4 Select the plot option by pressing lt copy options COPY IS PRT PLT PRT 5 Create the plot by pressing USER PLOT 4 50 Programming Programming Programming Programming In this chapter you will
140. h in subparagraph c 1 Gi of the Rights in Technical Data and Computer Software clause at DFARS 252 227 7013 for DOD agencies and sub paragraphs 1 and 2 of the Commercial Computer Software Restricted Rights clause at FAR 52 227 19 for other agencies Exclusive Remedies The remedies provided herein are buyer s sole and exclusive remedies Agilent Technolo gies shall not be liable for any direct indirect special inci dental or consequential dam ages whether based on contract tort or any other legal theory Safety Symbols CAUTION The caution sign denotes a hazard It calls attention to a procedure which if not cor rectly performed or adhered to could result in damage to or destruction of the product Do not proceed beyond a cau tion sign until the indicated conditions are fully under stood and met WARNING The warning sign denotes a hazard It calls attention to a procedure which if not cor rectly performed or adhered to could result in injury or loss of life Do not proceed beyond a warning sign until the indicated conditions are fully understood and met ii Contents Introduction Analysis with the Agilent 71501D 1 2 Installation Introduction 2 2 Step 1 Inspect the Shipment 2 11 Step 2 Install N1015A Optional 2 12 Step 3 Set Up the Equipment with an N1015A 2 16 Step 3 Set Up the Equipment without an N1015A 2 30 Step 4 Set the MSIB and GPIB addresses 2 43
141. has different data rates between the input and out put the 71501D must be in the MUX DEMUX mode Refer to To Use Differ ent Input Output Data Rates on page 4 24 The clock source and error performance analyzer selected must be capable of operating at the input data rate you specify The signal level from the pattern generator clock out to channel 2 of the 70820A must be 0 5 to 1 0 V peak to peak The signal level from the device under test output to either the N1015A or channel 1 of the 70820A must be 2 to 4 dBm 0 5 to 1V peak to peak If signals exceed this level use the 6 dB attenuator to reduce voltage levels 3 42 Tutorials Tutorial 4 Diagnostic Measurements Step 3 Perform a Diagnostic Measurement 5 Select diagnostic measurement by pressing Diagnos A single point calibration is performed 6 Set the jitter rate to be applied to the clock signal to 100 kHz by pressing JITTER FREQ 100 kHz A single point initial calibration is performed 7 Set the amplitude of the jitter applied to the clock signal to two unit intervals peak to peak by pressing JITTER AMPL 2 ENTER In the following measurements waveforms to both Channel 1 and Channel 2 are displayed Jitter Waveform and Jitter Spectrum are useful only for signals whose total bandwidth is less than 10 MHz since the maximum sampling frequency of the 70820A is 20 MHz Signal bandwidth is approximately 2 x modulation frequency x 1 p x UL For bro
142. ing DONE or ERROR a ERROR is returned if Param is outside the listed range Ec lt lt lt a PROG WA um EE 5 Response a PROG WAIT Omoomomooo 2 20 1 2 1 1 E cc 8 PROG STAT CONT A a PROG STAT CONT a PROG NUMB Param 1 2 a PROG STR Command TOLSEARCHFACTOR IT AS a PROG STR Response 5 33 Example Programming Programming TOLSEARCHFLAG The TOLSEARCHFLAG command string enables or disables the jitter toler ance search feature Values of Program Variables Variable Data Type Value Command string TOLSEARCHFLAG Param string ON OFF Response string DONE or ERROR a ERROR is returned if Param is not ON or OFF OUTPUT Mta PROG STR Param ON OUTPUT Mta PROG STR Command TOLSEARCHFLAG OUTPUT Mta PROG WAIT ENTER Mta A OUTPUT Mta PROG STR Response ENTER Mta Response OUTPUT Mta PROG STAT CONT OUTPUT Mta PROG WAIT ENTER Mta A OUTPUT Mta PROG STAT CONT 5 34 Programming Programming TRANSFER The TRANSFER command string performs the jitter transfer measurement Before performing a TRANSFER measurement specify a jitter template using TEMPLATE or CUSTOM set the input and output clock frequencies using INCLOCKFREQ and OUTCLOCKFREQ and perform a jitter calibration usi
143. instrument state user correction or histogram press the appropriate softkey Ifyou are saving a trace press save trace Select the trace and then use the VECIFMT softkey to determine if the trace data is saved as complex data VEC or scalar data FMT Press save e Ifyou are saving a channel calibration mask limit line user defined key all recall registers press save misc and then the appropriate softkey 3 Enter the desired file name 4 To save the file press ENTER LINE 4 46 To Recall a File To Erase a File Reference Memory Cards Disks and RAM Agilent recommends using a keyboard An keyboard is recommended to simplify the task of entering alphanumeric information This keyboard plugs into the jack provided on the display s front panel Order the keyboard using the following part numbers Keyboard Agilent 46021A cable pn 46020 60001 Entering a file name without a keyboard e Turn the front panel knob to move the character select cursor e Press SELECT CHAR to enter a character at the character select cursor e Press the numeric keypad to enter numbers or a minus sign e The INSERT or softkey determines the action of the SELECT CHAR softkey Choices are INSERT a character REPLACE an existing character or DE LETE a character e Press the and U keys beneath the front panel knob to move the com mand entry cursor Use the CLEAR TO END softkey to remove characters from the command entry cu
144. ion Measurements with no Test Set panel Make This Instrument Connection TO This Instrument Jitter Modulation SYNC OUT TO Microwave Transition Analyzer SYNC IN rear panel Jitter Modulation SIGNAL OUTPUT TO Clock Source FM IN EXT 1 INPUT front panel for E4422B Jitter Modulation GPIB rear panel TO GPIB INTERCONNECT rear panel Clock Source Stand Alone RF OUTPUT 0 Pattern Generator CLOCK IN Clock Source Modular CLOCK OUT Clock Source 10 MHz REF OUT rear panel TO Jitter Modulation 10 MHz REF IN rear panel Clock Source Stand Alone GPIB rear panel TO GPIB INTERCONNECT rear panel Microwave Transition Analyzer 10 MHz RF OUT 0 Clock Source 10 MHz REF IN rear panel rear panel Microwave Transition Analyzer GPIB rear panel TO GPIB INTERCONNECT rear panel Pattern Generator CLOCK OUT through BP filter TO Microwave Transition Analyzer CH 2 Pattern Generator DATA OUT TO DUT Data In DUT Clock Out TO Microwave Transition Analyzer CH 1 through filter Pattern Generator Stand Alone GPIB rear panel TO GPIB INTERCONNECT rear panel Configuration with 2 MMS Mainframes MTA Mainframe MSIB OUT rear panel TO PG amp ED Mainframe MSIB IN rear panel PG amp ED Mainframe MSIB OUT rear panel TO MTA Mainframe MSIB IN rear panel Configuration with 3 MMS Mainframes MTA Mainframe MSIB OUT rear panel TO
145. is positioned one half division from the left Measure the jitter magnitude using the marker function on the 70820 by pressing MENU Markers HIGHEST PEAK The marker is placed on the signal peak and the marker readout shows the jit ter frequency and peak magnitude Multiply peak magnitude by two the get UL s Press USER to return to the jitter measurement application menus The demodulated phase of the clock signal is displayed as four or five cycles of a sinusoidal waveform More cycles will be shown for jitter frequencies above a few hundred kilohertz fewer for high amplitude or low frequency jitter At low jitter levels you may see a significant amount of noise accompanying the sinu soidal jitter Increase the signal to noise ratio to clean up the display of the signal by pressing JITTER AMPL 2 ENTER The jitter magnitude is increased to 2 UI pk pk At a jitter frequency of 10 KHz most 71501D compatible clock sources can produce at least 10 Ul ask At this high jitter level the displayed jitter wave form should be nearly a pure sinusoid 3 51 Clock Spectra Clock Waveform Tutorials Troubleshooting the Jitter Analyzer System If the displayed waveform is tilted either a sloping sinusoid or a sloping line you re seeing a continuous phase advance or retard This indicates either the frequency of the clock does not match the frequency entered in the Setup menu or the clock source is not phase locke
146. it Press prev menu MEASURE TOLRNCE The tolerance measurement is made repeatedly In the first measurement the jitter amplitude specified in the template modified by Margin and brought into the system s jitter amplitude range is used The subsequent measure ments are repeated at the same jitter frequency after the jitter amplitude is multiplied by the search factor default value is 1 2 e Ifthe search factor is gt 1 the test is repeated at increasing jitter amplitudes until the DUT fails e Ifthe search factor is between 0 and 1 the test is repeated with decreasing jitter amplitudes until the DUT passes STM 4 Jitter Tolerance Search Results LUI Ampe 1 190 7 Mo LER Modulation Frequency Hz E Example of the Search Factor Feature Perform a Single Point Jitter Tolerance Test 12 To perform a jitter tolerance test at 158 kHz with a jitter amplitude of 0 3 UI a bit error rate of 1 x 10 and a gating time of 10 seconds press Jitter Tolrnce Errors BER BER BER THRESHLD 1 E 8 ENTER Manual Tolrnce Wait for the initial calibration to be completed 3 27 13 Stand Alone Error Performance Analyzer Modular Error Detector 14 15 16 Tutorials Tutorial 2 Jitter Tolerance Measurements Set the gating time to 10 seconds on the error detector e Ifyou are using a stand alone error performance analyzer 70843A B C with 70004A or 86130A press the following
147. ized and is measuring a bit error ratio BER of 0 before proceeding Otherwise the jitter test results will be incorrect 3 24 Tutorials Tutorial 2 Jitter Tolerance Measurements Jitter Tolerance Input Template O0 44 J 0 z J p TE E IHE LEG Modulation Frequency Hz Done amp CONT Display of a Jitter Tolerance Measurement using BER Detection Colored boxes are displayed on the measured data points Green box indicates data passed bit error rate conditions were met e Red x indicates data failed bit error rate conditions were not met Use the ERROR Function To determine if any errors occur at any of the jitter test frequencies press ERRORS BER ERRORS CONT Perform a jitter tolerance measurement by pressing MEASURE TOLRNCE CONT Although the testing criteria changed the display is the same as shown previously when using the ERRORS BER BER function Measure to a Margin The two techniques for performing a jitter tolerance margin test are ncreasing or decreasing the level of the standard tolerance template by a fixed percentage e Using the jitter tolerance search routine 3 25 Tutorials Tutorial 2 Jitter Tolerance Measurements 8 Increase the jitter level of a jitter tolerance template 50 by pressing Jitter Tolrnce Margin 50 ENTER The jitter level of each test point is increased by 50 For example a jitter level of 15 UI wou
148. k to peak Normal sensitivity mode at 10 Gb s has 0 08 UI peak to peak The high sensitivity mode is automatically selected when the following condi tions exist N1015A test set with a 10 GHz modulator is in the equipment configuration Clock source frequency is set in the range of 9 8 to 18 GHz Input and output clock rates are the same MUX DEMUX is set to OFF If any of the above conditions is not met the normal sensitivity mode is selected When the 71501D is in the high sensitivity mode the measurement algorithm measures the difference in phase between the clock source 70820A channel 2 and the DUT clock output 70820A channel 1 When you start the mea surement a search algorithm first attempts to line up the clock phase between the two channels then the jitter measurement is made This search might fail if the jitter is too large or the DUT clock phase is drifting In this case the ana lyzer will automatically revert to the normal sensitivity measurement mode When the 71501D is in the normal sensitivity mode the DUT jitter is mea sured with the 70820A channel 1 The 70820A channel 2 is not used In the normal mode the measurement is insensitive to slow phase drifts and can tol erate larger amounts of total jitter 4 15 Reference Jitter Measurements Jitter Diagnostic Capabilities For diagnostic purposes the Agilent 71501D has the ability to display the demodulated or base band jitter spectrum and wavefor
149. l input impedance 50 a Includes two 2 4 mm f to 3 5 mm f adapters 6 3 Specifications and Characteristics N1015A Specifications N1015A Specifications Input Values Clock Input Maximum DC Offset Voltage 42 Vink Maximum RF Input Power 10 dBm Recommended Input Power 2 dBm to 4 dBm Jitter Modulation Input Maximum Instantaneous Voltage 10 V Recommended Jitter Source Impedance 50 Ohms DC coupled a This maximum DC voltage is derived from the 70820A RF Input 1 and RF Input 2 limits In some cases the N1015A routes the input signal directly to an output These limits are set to avoid potential damage to the 70820A RF input or pattern generator clock input The N1015A can withstand 5V DC offset Dimensions and Weight Cabinet Dimensions Height 88 mm Width 425 mm Deep 498 mm Instrument Weight 22 Ibs 10 kgm COMPLIANCE This ISM device complies with Canadian ICES 001 CT CANADIAN Cet appareil ISM est conforme a la norme NMB du Canada REQUIREMENTS 6 4 Specifications and Characteristics N1015A Specifications DECLARATION OF CONFORMITY According to ISO IEC Guide 22 and CEN CENELEC EN 45014 Manufacturer s Name Agilent Technologies Inc Manufacturer s Address 1400 Fountaingrove Parkway Santa Rosa CA 95403 1799 USA Declares that the products Product Name Modulation Test Set Model Number N1015A Product Options This declaration covers all options of the ab
150. ld increase to 22 5 UI Jitter margin levels can be increased by 100 or decreased to 1 enter 9996 of the current template levels Depending on the data rate clock frequency and level of jitter defined by the template jitter margin levels of 100 may not be possible due to system hard ware limitations In this case the system automatically defaults to the highest attainable jitter level Titer Tolerance Input Template OC 4H LUI Amp 1 18 7 HEE ETH EE LEH LE Modulation Frequency Hz CONT Example of the Template and Margin Test The tolerance search feature may be used to automatically modify the jitter level at each frequency in a template Determine Specific Jitter Levels at Which BER is Degraded e tolerance search e single point manual tolerance testing 9 To enable searching press Jitter Tolerance tolrnce options SEARCH ON OFF ON e Ifthe search is on the tolerance result plot and list will show the highest jit ter level at which the DUT error criterion is met at each jitter frequency in the template e Ifthe search is off the plot and list show performance at the template level modified by Margin 3 26 Tutorials Tutorial 2 Jitter Tolerance Measurements 10 Set the search factor for example to 1 5 by pressing SEARCH Factor 1 5 NOTE 11 ENTER If you use the knob to set the search factor the value is automatically entered as you set
151. lent Sales Office will arrange for repair or replacement at Agilent s option without waiting for claim settlement Review the individual manuals for your equipment to ensure that your operating or storage environment is suitable for the instruments If you ordered an N1015A Modulation Test Set refer to Step 2 Install N1015A Optional on page 2 12 Install the instruments so that the detachable power cords are readily identifi able and is easily reached by the operator The detachable power cord is the instrument disconnecting device It disconnects the mains circuits from the mains supply before other parts of the instrument The front panel switch is only a standby switch and is not a LINE switch Alternatively an externally installed switch or circuit breaker which is readily identifiable and is easily reached by the operator may be used as a disconnecting device WARNING WARNING WARNING CAUTION CAUTION CAUTION Installation Step 2 Install N1015A Optional Step 2 Install N1015A Optional Observe the following notes cautions and warnings that apply to the N1015A This product has been designed and tested in accordance with the standards listed in the Manufacturer s Declaration of Conformity and has been supplied in a safe condition The documentation contains information and warnings which must be followed by the user to ensure safe operation and to maintain th
152. lock waveform 3 47 IF calibration data traces 4 33 jitter spectrum 3 44 jitter waveform 3 45 Index 6 Index viewing program version and hardware config uration 4 37 volatile memory 4 39 weight 2 14 Index 7 Index Index 8
153. lot Measurement Results 4 49 4 2 Reference Menu Maps Menu Maps The menu maps in this section graphically represent the softkey menus asso ciated with the jitter measurement application presented when USER is pressed Main Menu Left Side Softkeys Setup Jitter Trnsfer Jitter Tolrnce Jitter Generat Output Jitter Diagnos Templat Storage These 2 keys are available only when MUX DMX is on Setup Menu INtmplt nn nn INclk FREQ MUX DMX ON OFF OUTrate nn nn OUTclk FREQ SELECT edit templat EDIT CAL INPUT ADD DELETE DELETE ALL prev menu EXIT 0C 192 0C 48 0C 12 0 3 sdh CUSTOM prev menu or STM 64 STM 16 STM 4 STM 1 sonet CUSTOM prev menu jitmenu1 4 3 Reference Menu Maps Main Menu Left Side Softkeys Setup Jitter Trnsfer MEASURE TRNSFER tmsfer results average ON OFF AVERAGE SWEEPS CORNER FREQ GAIN AMPLTD PAUSE ON OFF CONT EXIT Jitter Tolrnce Jitter Generat Output Jitter Diagnos Mass Storage PLOT TRNSFER PLOT DELTA LIST TRNSFER PAGE UP PAGE DOWN prev menu prev menu jitmenu2 Jitter Transfer Menu 4 4 Reference Menu Maps Main Menu Left Side Softkeys Setup MEASURE TOLRNCE Jitter Trnsfer tolrnce results Jitter Tolrnce tolrnce options Jitter Generat ERRORS BER Output Jitter BER THRSHLD CONT EXIT Diagnos MARGIN Mass Storage manual tolrnce PLOT TOLRNCE P
154. m of a phase modu lated clock signal Also similar to using a high frequency spectrum analyzer and high speed oscilloscope the clock spectrum and waveform can be dis played For troubleshooting purposes the system can provide data signals with arbi trary jitter magnitudes and frequencies For example if a data stream with 2UI of jitter at 15 kHz is desired enter in these values and the system will auto matically produce the desired signal 4 16 NOTE Reference Analyzer System Configuration and Setup Analyzer System Configuration and Setup This section has information on some aspects of configuring the jitter system and setting up the measurement conditions Loading the Jitter Personality Automatically Loading the Personality Set up the system equipment Insert the jitter personality card into the front panel card slot of the microwave transition analyzer facing the metal strip on the card downward and toward the instrument Make sure the card is fully inserted into the card slot Switch on the power to all of the equipment Switch on the power to the 70820A last The start up process takes about 6 minutes If you reconfigure the equipment after the jitter personality has been loaded refer to Rescan the Equipment after Reconfiguring on page 4 19 Manually Loading the Personality Assign the display to the 70820A Verify the jitter program card is fully inserted into the card slot and then press
155. mandates that the 70820A and clock source instru ments have their 10 MHz frequency references locked together Making measurements with bandpass filters provides the greatest accuracy If a template has previously been selected this template will be used at the new rate Perform a calibration before making measurements To perform a system calibration on page 2 52 The first time jitter transfer is performed with OUTcIk gt INclk at some jitter frequency points the UI level may be adjusted downward to limit channel 1 jitter levels This guarantees an accurate jitter transfers measurement However the lower adjusted UI vlaues will be used in subsequent jitter TOLERance measurements The adjusted values can be examined by the instructions in To Create a Custom Template on page 4 22 To perform MUX TRANSfer and TOLerance tests repeatedly without the UI adjusted values affecting TOLerance use the instructions in To Create a Custom Template on page 4 22 to store the calibrated template desired for the TOLerance test The template can be reloaded and used each time before a TOLerance test without recalibrating for several hours Select the template closest to your desired clock frequency by pressing Setup INtmplt OC 192 OC 48 OC 12 OC 3 or sdh CLOCK FREQ When the sdh softkey is selected the key choices will be standard rates STM 64 STM 16 STM 4 and STM 1 The initial selection will be the SDH stan dard at the same
156. measurements at a given jitter frequency in a table A new table is created when the jitter fre quency is changed 3 28 Tutorials Tutorial 2 Jitter Tolerance Measurements Mits 115 817 us 3 002 MANUAL Setup Meit 34 6192 us 2 997 pk pk 3 9982 MEASURE Jitter f Y IA T X A JITTER Trasfer i i Toy i ILA i i FREQ H i j j j Jitter i JITTER Tolrnce Ni wi i v X Af JITTER TOLERANCE Errars Jitter Generat Freq ul Errars Status Qut put 1 8BB kHz 15 006 Ul PASS Jitter 1 kHz 5 646 Ul FASS 10 88 kHz B BGB Ul PASS Diagnos Nass prey Storage Done Example Results of the Manual Tolerance Test Display the Last Measurement 17 To display the measurement results in either a graphical or list form press tolrnce results The data collected during the last measurement is displayed NOTE If tolerance search is activated the data plotted or listed is the last success That is the highest jitter level at which the test criterion ERRORS or BER was met If tolerance search is off the data plotted or listed is at the template level modified by margin 18 To display the results in list form press LIST TOLRNCE 3 29 19 20 21 22 Tutorials Tutorial 2 Jitter Tolerance Measurements
157. ments of the jittered clock waveform At high jitter amplitudes the clock waveform will appear quite distorted Use the AUTODIAG function When the AUTODIAG function is on the analyzer calibrates the signal and adjusts the frequency or time span to optimize the display of the signals To maintain a fixed span turn the AUTODIAG function off To disable this feature and maintain a constant span press AUTODIAG ON OFF OFF 3 48 Troubleshooting Checklist Tutorials Troubleshooting the Jitter Analyzer System Troubleshooting the Jitter Analyzer System Do the bandpass or lowpass filters match the selected template clock frequen cy If the frequency ranges do not match the 70820A will not find a signal Do all of the system instruments have AC power supplied Are all of the system instruments switched on Does each system instrument have a unique address Are the GPIB instruments on the private bus Are the remotely controlled instruments on the private GPIB bus Have you pushed a number of buttons in a rapid succession If you have done this it can sometimes cause the 70820A to operate incorrectly Restart the 70820A by switching the power off and then on If the 70820A is not responding to the menu keys switch the power off and then on to restart the instrument Have you pushed the 70820A INSTR PRESET button If you have the 70820A displays a Microwave Transition Analyzer menu and signal display Press USE
158. mmand mooo 2 2 m 20 2 gt 5 4 Sending a GPIB general device clear Programming Programming When the first PROG STAT CONT is sent the program sets the string variables Command Response and Param to the null string The program also sets the numeric variables Param Rpts and Rnoise to zero It then PAUSEs again The second PROG STAT CONT allows the program to continue To help maintain syn chronization between the external program and the Instrument BASIC pro gram make sure the program is not paused immediately after sending each command OUTPUT Mta PROG STAT ENTER Mta Status IF Status PAUS THEN OUTPUT Mta PROG STAT CONT Alternative to PROG WAIT The PROG WAIT query freezes the GPIB until the command has completed If the external program needs to use the GPIB to control other instruments on the bus while the command is in progress it may periodically check for com mand completion by using PROG STAT WHILE Curstate lt gt PAUS WAIT 10 OUTPUT Mta PROG STAT ENTER Mta Curstate END WHILE If this query is made frequently the execution of the command will be signifi cantly slowed Wait between sucessive polls This method may be useful for programming languages other than Basic Executing a general GPIB device clear to an 70841B pattern generator can cause the GPIB to lock up If a remote program needs to clear the bus using an GPIB general device clear
159. mum Jitter OC 192 Mask STM 64 Mask Jitter Amplitude UI pp 2 0 01 1 01 1 E 02 1 03 1 E 04 1 05 1 06 1 07 Jitter Frequency Hz 6 16 Specifications and Characteristics Jitter Modulation Capabilities of 71501D System Configurations 70340 N1015A Capability 9 8 13 Gb s 100 I TT m 10 a Y 2 4 1 tT E iL Co 0 1 0 01 t 1 01 1 02 1 03 1 E 04 1 05 06 1 07 1E 08 Jitter Frequency Hz 70340 N1015A Capability 2 4 3 2 Gb s 100 i 10 E E 2 3 FEE a E n 8 5 4 01 001 t 1 01 1 02 1 03 1 04 1 05 1 06 1 07 1 08 Jitter Frequency Hz Maximum Jitter Minimum Jitter OC 192 Mask STM 64 Mask Maximum Jitter Minimum Jitter OC 48
160. nalyzer 2 8 71501D instruments 2 2 2 7 71501D system 1 2 83732A signal generator 2 7 83752A signal generator 2 7 86130A Bitalyzer 2 7 A ac power cables 2 14 acceptance specification 3 9 accessories and cables 2 10 accuracy jitter generation 4 15 Agilent offices 2 55 amplitude adjustment 3 11 analyze jitter 3 39 analyzer calibration 4 27 analyzer setup menu 1 4 AUTODIAG key 3 44 automatically loading personality 4 17 AUTOST 4 18 AUTOST file 2 48 AVERAGE command 5 7 AVERAGEFLAG command 5 7 B bandpass filters 2 10 4 19 battery for memory card 4 42 BER detection 3 25 BER THRESHLD 3 22 BERT 2 7 BERTHRS command 5 8 bit error rate 3 22 Bitalyzer 2 7 Index C cables and accessories 2 10 calibrating IF 4 30 calibrating the analyzer 4 27 calibration menu 4 29 messages 2 52 procedure 2 52 calibration error messages 2 52 calibrator signal control 4 36 CALINP command 5 9 cards memory 4 38 catalog files 4 46 CE mark 2 13 channel delay matching 4 31 cleaning 2 13 clock and data alignment 3 23 devices with no clock output 4 12 source 2 7 source considerations 2 3 spectra verifying 3 52 spectrum 3 46 spectrum viewing 3 46 waveform viewing 3 47 commands AVERAGE 5 7 AVERAGEFLAG 5 7 BERTHRS 5 8 CALINP 5 9 CUSTOM 5 10 GAIN 5 11 GENERATE 5 12 GENFC1 5 18 GENSWEEPS 5 14 INCLOCKFREQ 5 14 LOAD_TEMPLATE 5 15 MARGIN 5 18 OUTCLOCKFREQ 5 19 OUT
161. nd TRANSFER TPUT Mta PROG WAIT Response TPUT Mta PROG NUMB Rpts ust ENTER all 28 rows of 4 values K Jitfreg Jitampl Transfer dB Flag AT CONT T Mta PROG WAIT AT CONT In this example the values are converted from character string to floating point numbers as they are received A program might instead read every thing into one long string variable and then extract the individual values The values are se nt 19 characters per value such as 1 27778184201E 002 separated by commas TRANSFER FC The TRANSFER FC command string sets the jitter transfer corner frequency Values of Program Variables Variable Data Type Value Command string TRANSFER FC Param floating point number 5 Hz to 80 MHz 5 to 20E6 Hz Response string DONE or ERROR a ERROR is returned if value is outside the listed range OUTPUT Mta PROG NUMB Param 1E6 OUTPUT Mta PROG STR Command TRANSFER FC OUTPUT Mta PROG WAIT ENTER Mta A OUTPUT Mta PROG STR Response ENTER Mta Response OUTPUT Mta PROG STAT CONT OUTPUT Mta PROG WAIT ENTER Mta A OUTPUT Mta PROG STAT CONT 5 36 Specifications and Characteristics Definitions of Terms Specifications and Characteristics Specifications and Characteristics Specifications and Characteristics Th Th is chapter contains the following topics
162. ng CALINP The commands TRANSFER_FC GAIN AVERAGE and AVER AGEFLAG may also be used to set up the jitter transfer measurement Band pass filters designed for jitter measurement at the clock frequencies being used should be placed on 70820 inputs 1 and 2 Values of Program Variables Variable Data Type Value Command string TRANSFER Param There are no parameters for this command Response string DONE or ERROR Rpts floating point array of 28 see below rows and 4 columns a ERROR is returned if a template has not been selected or if a calibration is required Result is Rpts array For each frequency in the template four values are sent jitter frequency in Hz jitter amplitude in unit intervals peak to peak measured jitter transfer value dB e jitter transfer test result flag where 1 pass jitter transfer is below the specification line determined by TRANSFER FC and GAIN fail Gitter transfer value is above the specification line 99 measurement algorithm failure 128 this point skipped for example calibration failed at this frequency 5 35 Example Example Programming Programming TPUT Mta PROG S1 TER Mta A TPUT Mta PROG ST TER Mta Response D n 9 1t028 M mgeuomoo czccmz Ea c T Poin TPUT Mta PROG S1 TER Mta A TPUT Mta PROG ST ER Mta USING 96 R Comma
163. ock Source CLOCK OUT modular 0 Test Set IN 2 5 Gb s or 10 Gb s Clock Source 10 MHz REF OUT rear panel TO Jitter Modulation 10 MHz REF IN rear panel Clock Source GPIB rear panel TO GPIB INTERCONNECT rear panel Microwave Transition Analyzer 10 MHz RF OUT rear panel TO Clock Source 10 MHz REF IN rear panel Microwave Transition Analyzer GPIB rear panel TO GPIB INTERCONNECT rear panel Pattern Generator CLOCK OUT through BP filter TO Microwave Transition Analyzer CH 2 Pattern Generator DATA OUT TO DUT Data In DUT Clock Out TO Test Set DUT OUT Pattern Generator Stand Alone GPIB rear panel TO GPIB INTERCONNECT rear panel U Test Set JITTER MODULATION OUT TO Clock Source FM IN EXT 1 INPUT front panel for E4422B Test Set CH1 MTA through filter TO Microwave Transition Analyzer CH 1 9 8 13 Gb s operation Test Set OUT 2 5 Gb s or 10 Gb s TO Patter Generator CLOCK IN Test Set GPIB rear panel TO GPIB INTERCONNECT rear panel Configuration with 2 MMS Mainframes MTA Mainframe MSIB OUT rear panel TO PG amp ED Mainframe MSIB IN rear panel PG amp ED Mainframe MSIB OUT rear panel TO MTA Mainframe MSIB IN rear panel Configuration with 3 MMS Mainframes MTA Mainframe MSIB OUT rear panel TO PG Mainframe MSIB IN rear panel PG
164. of 2 mass storage msi MEMORY 4 39 GPIB Disk Drives Reference Memory Cards Disks and RAM The RAM disk number is shown on the screen Use the front panel knob to change the RAM disk number Measurement data and files can be saved on an external GPIB disk drive The disk drive must be a 3 5 inch CS80 compatible such as an 9122 To use the drive you must connect it and enter its GPIB address using DISPLAY menu softkeys The procedure in this section shows you how to do this You will need to know the disk drive s GPIB address unit number and volume number The GPIB address is represented by a digit from 1 through 7 The unit number indicates an individual slot in the disk drive Although unit numbers can range from 0 through 9 they are typically 0 or 1 The volume number is used for hard disk drives For reading diskettes the volume number should be 0 To Use an GPIB Disk Drive Connect the GPIB disk drive to the 70004A color display using an GPIB cable Determine or set the GPIB address of the disk drive Refer to the disk drive s user s manual for information on determining the disk drive s address Set the GPIB address of the disk drive by pressing DISPLAY Mass Storage msi GPIB disk GPIB ADDRESS enter the address of the disk drive This value is between 1 and 7 Enter the disk drive s unit number by pressing UNIT NUMBER This number is typically a 0 or 1 Zero usually indicates the disk drive s lef
165. ommand string saves the current input jitter tem plate on the current template storage device such as a memory card Ifa file of the same name already exists it will be overwritten If valid the calibration data is saved as well as all the parameters listed on the following pages Values of Program Variables Variable Data Type Value Command string SAVE_TEMPLATE Param floating point number filename 1 to 8 characters Response string DONE DISK FULL WRITE PROTECT DISK NOT PRESENT NOT INITIALIZED DISK 1 1 0 ERROR oe a May be caused by illegal characters in the filename The characters in the filename are restricted to numbers letters and the underscore The first character of the filename must be a letter All characters in the filename are converted to uppercase When using the front panel Template Storage Load Template and Save Tem plate functions the prefix T is added to the eight character filename entered by the user When using the remote programming commands the pre fix is not added and the user may enter all ten characters However only file names beginning with T will be displayed when using the Template Storage function from the front panel AII filenames will be displayed when using the remote PROG CAT query 5 27 Example Programming Programming Mta PROG STR Param filename PUT Mta PROG STR Command SAVE TEMPLATE Mta PROG WAIT AS PUT Mta PROG ST
166. ove product Is in conformity with Safety IEC 61010 1 1990 A1 1992 A2 1995 EN 61010 1 1994 A2 1995 CAN CSA C22 2 No 1010 1 92 EMC CISPR 11 1990 EN 55011 1991 Group 1 Class A IEC 61000 4 2 1995 A1 1998 EN 61000 4 2 1995 4 kV CD 8 kV AD IEC 61000 4 3 1995 EN 61000 4 3 1995 3 V m 80 1000 MHz IEC 61000 4 4 1995 EN 61000 4 4 1995 0 5 kV sig lines 1 kV pow lines IEC 61000 4 5 1995 EN 61000 4 5 1995 0 5 kV l l 1 kV l e IEC 61000 4 6 1996 EN 61000 4 6 1996 3V 80 AM power line IEC 61000 4 11 1994 EN 61000 4 11 1994 100 20 ms Supplementary Information The products herewith comply with the requirements of the Low Voltage Directive 73 23 EEC and the EMC Directive 89 336 EEC and carrv the CE markina accordingly pe Santa Rosa CA USA 30 April 2002 Greg Pfeiffer Quality Engineering Manager For further information please contact your local Agilent Technologies sales office agent or distributor 6 5 Specifications and Characteristics Jitter Characteristics Jitter Characteristics Sinusoidal Jitter Stimulus used in Transfer Tolerance and Diagnostic Measurements Maximum and Minimum Values Refer to Jitter Modulation Capabilities of 71501D System Configurations on page 6 9 for the values specific to a combination of generator data rate and test set Maximum Calibration Levels Maximum Jitter Levels that can be measured with an HP 71501C 100 Jitter Amplitude Ul
167. owing Jitter analyzer personality Microwave transition analyzer module jitter receiver controller Color display mainframe Jitter modulation source Clock source Modulation test set User s guide You will also need a pattern generator for all of the jitter applications and an error detector for the jitter tolerance application The 71501D jitter analysis system can share the 70004A color display with a compatible modular pattern generator and an error detector The compatible sources have different fre quency ranges and FM characteristics Refer to Jitter System Configurations on page 2 2 for a list of possible system equipment Also refer to Chapter 6 Specifications and Characteristics for detailed information 1 2 Introduction Analysis with the Agilent 71501D Menu and Softkey Overview Most front panel controls are accessed through softkey menus Softkeys are the seven buttons located on each side of the 70004A screen The functions of softkeys change according to the menus displayed on the screen Use the left side softkeys to access the major menus Softkeys Channel1 Channel 2 Display User Data Entry lt pob2a Use the following three front panel keys on the 70004A display to select the available softkey menus USER press to select between the jitter measurement personality and Instrument BASIC menus The 71501D jitter analysis personality must first be loaded as d
168. p 4 Set the MSIB and GPIB addresses 1 Set the MSIB instrument addresses following the MSIB rules Refer to the documentation of the individual MSIB instruments for informa tion on MSIB connection strategy and rules e On the rear panel of the 70004A 70820A instrument combination there are two GPIB connectors The 70004A GPIB connector is used for remote pro gramming The 70820A GPIB connector is a private GPIB used for the equip ment setup to allow 70820A jitter personality to control the required instruments Ensure that the GPIB connections are to the correct connec tor e The standard MSIB address for the 70820A is row 0 column 11 It uses a val ue one higher than its column address as its address on the private GPIB e The jitter system uses one clock source at a time yet you can connect more than one clock source to the GPIB and MSIB if each clock source has a unique address You can select a clock source when the jitter personality is first loading or from the template storage VERSION CONFIG menu 2 Whenthe system includes two 70004 display units dedicate one display to the 70820A and use the other display for other system instruments a To assign the display to other instruments press DISPLAY Address Map b Use the knob to highlight the desired instrument then press Assign Both Use the previous two steps to assign the second display to system instru ments other than the 71501D 70820A Do not press the NEXT IN
169. pass Opt 420 plus 4 GHz low pass Opt 435 2 66 Gb s bandpass Opt 480 plus 4 GHz low pass Opt 435 622 Mb s bandpass Opt 410 plus 800 MHz low pass Opt 412 NOTE In the testing conditions mentioned the lowpass filter is required to prevent the higher clock harmonics emanating from the pattern generator clock output e Ifyou are performing SONET SDH testing with the 71603 71841 70842 com bination of instruments only a band pass filter is required e Ifyou are performing 10 Gb s testing using the 71612 70843 combination of instruments the band pass filter guard band is adequate NOTE When using clock frequencies where bandpass filters are not available a low pass filter plus a DC block 11742A can be substituted for the bandpass filter The DC block protects the 70820 sampling input from the DC level of the pattern generator clock output For 622 Mb s testing use an 800 MHz low pass filter Opt 412 For 1 to 1 25 Gb s testing use a 1 5 GHz low pass filter Opt 417 For 2 4 to 3 3 Gb s testing use a 4 0 GHz low pass filter Opt 435 For 9 to 11 5 Gb s testing use a 12 4 GHz low pass filter Opt 467 4 Set the GPIB and MSIB addresses for the system instruments 5 Refer to To use two MMS displays on page 2 54 if you have more than one 70004A display in your equipment configuration 3 41 NOTE Tutorials Tutorial 4 Diagnostic Measurements Step 2 Set Up the Measurement
170. pass Opt 480 plus 4 GHz low pass Opt 435 622 Mb s bandpass Opt 410 plus 800 MHz low pass Opt 412 In the testing conditions mentioned the lowpass filter is required to prevent the higher clock harmonics emanating from the pattern generator clock output e Ifyou are performing SONET SDH testing with the 71603 71841 70842 com bination of instruments only a band pass filter is required e Ifyou are performing 10 Gb s testing using the 71612 70843 combination of instruments the band pass filter guard band is adequate When using clock frequencies where bandpass filters are not available a low pass filter plus a DC block 11742A can be substituted for the bandpass filter The DC block protects the 70820 sampling input from the DC level of the pattern generator clock output For 622 Mb s testing use an 800 MHz low pass filter Opt 412 e For 1 to 1 25 Gb s testing use a 1 5 GHz low pass filter Opt 417 For 2 4 to 3 3 Gb s testing use a 4 0 GHz low pass filter Opt 435 For 9 to 11 5 Gb s testing use a 12 4 GHz low pass filter Opt 467 Set the GPIB and MSIB addresses for the system instruments 5 Refer to To use two MMS displays on page 2 54 if you have more than one 70004A display in your equipment configuration 3 34 Tutorials Tutorial 3 Jitter Generation and Output NOTE NOTE Step 2 Set Up the Measurement Conditions 1 Insert the jitter personality card into the front
171. pattern generator clock output e Ifyou are performing SONET SDH testing with the 71603 71841 70842 com bination of instruments only a band pass filter is required e Ifyou are performing 10 Gb s testing using the 71612 70843 combination of instruments the band pass filter guard band is adequate When using clock frequencies where bandpass filters are not available a low pass filter plus a DC block 11742A can be substituted for the bandpass filter The DC block protects the 70820 sampling input from the DC level of the pattern generator clock output For 622 Mb s testing use an 800 MHz low pass filter Opt 412 For 1 to 1 25 Gb s testing use a 1 5 GHz low pass filter Opt 417 For 2 4 to 3 3 Gb s testing use a 4 0 GHz low pass filter Opt 435 For 9 to 11 5 Gb s testing use a 12 4 GHz low pass filter Opt 467 Set the GPIB and MSIB addresses for the system instruments 5 Refer to To use two MMS displays on page 2 54 if you have more than one 70004A display in your equipment configuration All GPIB and MSIB connections must be made prior to turning on the system 3 5 NOTE NOTE Tutorials Tutorial 1 Jitter Transfer Measurements Step 2 Set Up the Measurement Conditions Insert the jitter personality card into the front panel card slot of the 70004A facing the metal strip on the card downward and toward the instrument Switch on the power to all of the equipment Switch on th
172. plains the calibration for the 71501D system setup that you should perform before making jitter transfer and tolerance measurements The 70820A instrument calibrations and corrections are also explained Agilent 71501D System Calibration for Jitter Transfer or Tolerance Measurements If you choose a template that exceeds the modulation capabilities of the clock source the system will adjust the template to modulation levels that are com patible with the source For example the minimum modulation rate of the 83752A is about 300 Hz The templates for 155 Mb s and 622 Mb s start below 300 Hz The 71501D will not attempt to operate the 83752A below 300 Hz In this case the starting point of the template will be adjusted to 316 Hz Ifa template is loaded containing points at jitter frequencies outside the capability of the clock source these points will be skipped during calibration When viewed in the template editor these points will show the status as SKIPPED Rather than editing the values on these lines delete them and add new lines at frequencies within the clock source modulation frequency range Refer to Specifications and Characteristics on page 6 1 The magnitude of the jitter amplitude may be limited due to the data rate If the level you entered exceeds system capability the analyzer automatically sets it to the highest attainable level Load a standard or custom template as described in Step 6 Select Template and Measurem
173. positions 0 through 4 Zero represents the smallest available amplitude Four represents the largest amplitude These settings do not correlate to any specific amplitude and may vary between instruments 1 To turn the calibrator signal on press MENU page 1 of 2 Calib cal signal cal sig ONIOFF ON 2 To change the calibrator frequency and amplitude press MENU Calib cal signal FREQ 156 Hz 5 MHz AMPL 0 4 ta cal sig Pulisgen f f ON OFF cal signal freq 1 Measure Table p HAMPL Analyze Calib States Hs nas div Trt Cht Page 25 mlU div prev d gf P HU ref menu 4 36 To Display the Program Version and Hardware Configuration Reference Calibrating the Analyzer To display the jitter analyzer personality code version date and hardware con figuration press USER Template Storage VERSION amp CONFIG 3 11 45 55 JUN 21 1996 h m H T f Li R Bt gB MTA Clock FuncGen Pat Gen Err Det Configuration 1811 7 11 APWE Tt Jitter Analyzer Copyright Hewlett Packard 19 June 1996 903 7HJUBR Signal 813 2905 Synthesizer Function Generator ersanality Co 1995 1996 2 1 19 0 1 919 B849R 18 2 1 919 B949R ErrPerfAni 18 2 1 Pressing RE CONFIG initiates search for system instruments
174. pts Response Param numeric and string Command PAUSE It takes about 1 second for all the variables to be cleared after the remote computer sends the first PROG STAT 5 6 Example Programming Programming AVERAGE The AVERAGE command string sets the number of sweeps to be averaged ina jitter transfer measurement Values of Program Variables Variable Data Type Value Command string AVERAGE Param floating point number 1 TO 1000 Response string DONE or ERROR a ERROR is returned if the Param is outside the listed value range IPUT IPUT IPUT TER Mt TER M IPUT IPUT TER TPUT lt lt lt a PROG WAIT A 5 Response a PROG WAIT OMmMoOoOMoOoMMOdO eeccececce 5 gt a PROG STAT CONT A a PROG STAT CONT a PROG NUMB Param 25 a PROG STR Command AVERAGE a PROG STR Response AVERAGEFLAG The AVERAGEFLAG command string turns the Average function on or off in a jitter transfer measurement Values of Program Variables Variable Data Type Value Command string AVERAGEFLAG Param string ON OFF Response string DONE or ERROR a ERROR is returned if the Param is not ON or OFF 5 7 Programming Programming TPUT TPUT TPUT TER M TPUT TER M TPUT TPUT TER M TPUT a PROG STR Param ON a PROG STR Command AVERAGEFLAG a P
175. r 1 0 1 0 1 0 1 0 Save pattern Internal pattern 1 To return to the Jitter menu on the 70820 press Display next instr Continue pressing next instr until the 70820 appears at the bottom of the dis play 3 15 Tutorials Tutorial 1 Jitter Transfer Measurements To display the Jitter Analysis menu press User Continue pressing the User key until the Jitter Analysis menu appears To select the Demultiplex mode press Setup MUX DEMUX ON Set the output rate to one half the actual data rate For example if the DUT operates at 2488 32 Mb s set the output rate to 1244 16 Mb s Do not round off significant digits OUTclk freq 1244 16 Mb s The jitter transfer measurement can now be performed using the procedures described earlier 3 16 Tutorials Tutorial 2 Jitter Tolerance Measurements Tutorial 2 Jitter Tolerance Measurements A jitter tolerance measurement is used to describe the ability of a device or system to maintain communication quality in the presence of jitter The test can be viewed in two ways A standards based compliance test that requires the equipment to maintain a specific bit error ratio BER level at pre defined jitter levels and jitter fre quencies e A test that determines the actual jitter levels where the device under test no longer maintain a desired BER The following diagram shows the signal flow in the jitter tolerance test pro cess Agilent 3
176. rce The 71501D jitter analysis system may consist of the equipment shown in Table 2 1 Jitter System Configurations on page 2 7 Clock Source Considerations You can use either a modular or stand alone clock source and error perfor mance analyzer Refer to Table 2 2 Clock Source and Compatible Equip ment on page 2 9 Optional N1015A Modulation Test The N1015A modulation test set adds the range of 2 4 to 3 2 GHz with 20 MHz modulation 71501D options 300 305 or 9 8 to 18 GHz with 80 MHz modula tion 71501D options 310 305 2 3 Front Panel Installation Introduction Figure 2 1 on page 2 4 shows the front panel connectors and POWER ON switch 10 Gb s and 2 5 Gb s In 3 5 mm input connectors for output RF signal from the clock source Use the provided 3 5 mm adapters on these connectors as connector savers 10 Gb s and 2 5 Gb s Out 3 5 mm output connectors for signal to CLOCK IN on the pattern generator Use the provided 3 5 mm adapters on these connec tors as connector savers Dut Out 3 5 mm input connector for output signal of device under test Use a provided 3 5 mm adapter on this connector as connector savers Ch 1 MJA 3 5 mm output connector to channel 1 on the microwave transi tion analyzer module Use a provided 3 5 mm adapter on this connector as connector savers Jitter Modulation In BNC input connector for signal input from jitter mod ulation source Jitter Modulation Out BNC o
177. re using a stand alone error performance analyzer 70843A B C with 70004A display or 86130A press the following keys on the error perfor mance analyzer to align the data and set the gating time On the 70843A B C and 70004A press LCL USER input amp eye CLK DAT ALIGN Then press gating GATE BY TIME GATING PERIOD 41 SECONDS On the 86130A press Local In the ED Setup menu click Clock Data Center Then in the ED Setup menu click Accumulation Setup Activation Mode Single In the Period select Time and enter 41 seconds If you are using a modular error detector 70842A B follow these steps Press DISPLAY NEXT INSTR Continue pressing NEXT INSTR until 70842 is displayed at the bottom of the screen Press MENU dat clk p 0 1 THR AUTO MAN AUTO CLK DAT ALIGN The error detector performs a clock and data alignment for the BER test The data polarity and clock edge slope may need to be changed in order to synchronize the clock and data Wait for the alignment procedure to finish before proceeding to the next step Press gating GATING PERIOD 41 SEC To return to the jitter menu press DISPLAY NEXT INSTR Press NEXT INSTR until 70820 is displayed at the bottom of the screen Press USER USER CONT After you have performed a clock and data alignment and set the gating time the display should be similar to the following figure as the measurements are performed Ensure that the error detector has synchron
178. ro gram is loading This indicates the program is being read from the card Do not press any instrument keys until the program is loaded Pressing keys can cause the automatic program loading to abort When you first run the application it scans both instrument communication busses MSIB and GPIB to detect the instruments in the system This allows the system to adapt to different clock sources pattern generators and error detectors After the system has loaded the software a screen similiar to the following screen is displayed 2 45 Installation Step 5 Load the Personality Control HP7HB740 Jitter Analyzer Personality RESET Copyright Agilent Technologies 1995 1995 2002 2 15 May 2002 Utility PAUSE Configure instruments found HP IB 813 HP3325B Synthesizer Function Generator Miscel warp RUN J04 PRGBYADISPLAY N H 2 1 966 BBBHR DISPLRY M HO 2 1 Disk 311 PRAGA MTA M 11 2 L CONT 318 70443A ErrPerfAnl M 18 2 1 903 7H3 IBR Signal Gen N 13 2 1 Print STEP LRST Help ERROR E ENTER Example Screen Displayed after the Software Loads After the jitter application is loaded the following screen is displayed Milref 4 9234 kHz 4 366 dB INtmplt Setup Hal2 1 B He 14 59 dE 10 Jitter INclk Trnsfer FREQ Jitter T HUX DHX Tolrnce ON OFF Jitter m L 1 Generat Y Qut put f Jitter ak 2 T edi
179. rotect switch on the end which is not inserted into the display s card slot If this switch is slid toward the edge of the card marked SAFE no changes may be made to the content If you wish to write a new file to a card or remove a file slide its write protect switch toward the center of the card 1 Locate the arrow printed on one end of the card 2 Insert the card with the arrow facing up into the front panel card slot The card s arrow should match the arrow printed above the card slot 3 Select the memory card as the mass storage device by pressing DISPLAY Mass Storage msi MEMORY CARD 4 To display a catalog of the files on the memory card press MENU page 1 of 2 States more 1 of 2 mass storage msi MSIB CARD 4 41 To Initialize format a Memory Card CAUTION NOTE To Change a Memory Card Battery CAUTION Reference Memory Cards Disks and RAM If a memory card has never been formatted the 70820A will not recognize it and can not format it Start the format process with the 708774 personality ROM card in the card slot After you press FORMAT as shown in step 1 below remove the ROM card and insert the new RAM card and continue with step 2 of this procedure The following steps erase any files stored on the card If the memory card is new and needs to be formatted press MENU page 1 of 2 States more 1 of 2 mass storage more FORMAT To use the LIF format pres
180. rsor to the end of the command Use this procedure to recall a file from the default memory To select default memory refer to Selecting and Formatting Memory on page 4 39 To recall a file press MENU page 1 of 2 States more 1 of 2 mass storage Rotate the front panel knob to select highlight the desired file Load the file by pressing LOAD FILE Use this procedure to erase a file in the default memory To select default memory refer to Selecting and Formatting Memory on page 4 39 To erase a file press MENU page 1 of 2 States more 1 of 2 mass storage Rotate the front panel knob to select highlight the desired file 4 47 To Erase all Files CAUTION To Change the Prefix 1 2 To Erase a Custom Prefix 1 2 Reference Memory Cards Disks and RAM To erase the file press more PURGE FILE ENTER LINE This procedure erases all files stored in default memory To erase all files in default memory press MENU page 1 of 2 States more 1 of 2 mass storage more FORMAT To modify the prefix press MENU page 1 of 2 States more 1 of 2 mass storage more CHANGE PREFIX Enter the desired text To enter the prefix press ENTER LINE Entering the prefix without a keyboard Turn the front panel knob to move the character select cursor Press SELECT CHAR to enter a character at the character select cursor Press the numeric keypad to enter numbers or a minus sign The IN
181. s 2 30 Installation Step 3 Set Up the Equipment without an N1015A Test Setup 2 5 Jitter Transfer and Generation Connections with Mod ular Error Performance Analyzer and Clock Source BANDPASS FILTERS Ch 1 Ch2 Recovered Clock DUT Clock Out Data Out PATTERN GENERATOR trnsfrmms DISPLAY MICROWAVE TRANSITION ANALYZER Ho 100509 OBSS ood CoO Rear Syne In ry CoOoOoOo pacour poe oo ome CLOCK SOURCE o Clock Clock FM In In Out JITTER MODULATION Sync Out Ca Cde uoo OOF ooooo uH 0000 ooo pp 220000 nn d un um ooooo Signal 1 The 70841A B and 70842A B are the modular error performance analyzers compatible with the 71501D 2 31 Installation Step 3 Set Up the Equipment without an N1015A Rear Syne In 10 MHz Ref Out GPIB MICROWAVE TRANSITION e e MSIB Out ANALYZER lc Front i5 Sync JITTER TOME AMSIB In Outy__ MODULATION 10 MHz ATTERN P 5 GENERATOR x GPIB CLOCK 1 1 1 lr 1 10 i LL SOURCE m 8 ofp ooo MODULAR op MSIB Out commsr 2 32 Installation Step 3 Set Up the Equipment without an N1015A Table 2 11 Jitter Transfer and Generat
182. s FORMAT as LIF Another way to format LIF is to use the Instrument BASIC command INITIALIZE 904 To format as DOS press FORMAT as DOS The memory card battery is a lithium commercial CMOS type part number CR 2016 The memory card should be installed when the battery is removed If the battery is removed while the card is not installed all data in the card will be lost Store memory card files on another device before changing the battery when extra care is appropriate 4 42 To Duplicate a Memory Card Nme Reference Memory Cards Disks and RAM Write Protect Battery Groove Battery Switch Slot Clip pkb amp Install the memory card into the 70004A display On the front edge of the card locate the groove of the battery clip Gently pry the battery clip out of the card The battery fits inside the clip Replace the battery making sure the plus sign on the battery is on the same side as the plus sign on the clip Insert the battery clip into the memory card holding the clip as oriented in the figure Face the open edge of the clip toward the memory card s write protect switch Write the date the battery was replaced on the card Instrument BASIC provides the ability to mass copy all the files from one memory card to another memory card This allows you to easily reproduce copies without having to copy the files one at a time Use the following steps Refer to To Use a Memory
183. s 0 5 dB dependent on the jitter frequency Refer to Jit ter Characteristics on page 6 6 This assumes that both measurement channels are filtered to reject harmonic signal content 4 10 Reference Jitter Measurements Jitter Tolerance Jitter tolerance is the ability of a device or system to maintain communication quality in the presence of jitter The test can be done in two ways e Astandards based compliance test that requires the equipment to maintain a specific bit error ratio BER level at predefined jitter levels and jitter fre quencies Atest that determines the actual jitter levels where the DUT can no longer maintain a desired BER Similar to a jitter transfer test a jitter tolerance test is performed at several jit ter frequencies The jitter magnitudes are normally defined by the standard against which the test is being performed The signal flow diagram for a jitter tolerance measurement is shown below Error Detection Agilent Clock Pattern 71501D Source Modulation Generator Jitter Test Set Analyzer Agilent XX pata Device Modulation adel Test Source Recovered Clock jitter tolerance Both SDH and SONET test templates are available in the 71501D If jitter lev els and frequencies other than those defined by the standard based tests are desired you can develop custom templates Refer to Creating and Editing Templates on page 4 21
184. s by pressing page 2 of 2 Scale 4 34 Reference Calibrating the Analyzer 5 Select trace 1 and press AUTOSCALE 6 Select trace 2 and press AUTOSCALE 7 To display the various hardware responses press page 1 of 2 SHOW CAL Use the front panel step keys to scroll through the various hardware responses Channel 1 data Pulsgen SHOW 3 FFT stage 7 Measure f shou JCR FIR Table SICAL Anal ate Jent CAL iris INFO Jene ca Calib Tineo States 1 1 Hz 15 kHz div 158 kHz Tri Cht Page dB div 8 dB div prev caf 1 6 dB ref 1 6 dB ref menu Channel 2 data Example of Hardware Response Traces Performing a Self Test You can initiate an automatic self test routine that checks the internal condi tion of all major circuits The self test takes approximately 30 seconds to run This routine automatically runs whenever the microwave transition analyzer is turned on Perform the self test by pressing MENU page 1 of 2 Calib SELF TEST 4 35 Reference Calibrating the Analyzer Controlling the Calibrator Signal For verification purposes the Calibrator Output signal can be manually con trolled This includes changing its amplitude and frequency The signal has the following characteristics Shape square wave Frequency 153 Hz to 5 MHz Amplitude 5 positions The signal s amplitude can be set to one of five
185. s returned if Param is not one of the eight listed IPUT IPUT IPUT TER Mt TER M IPUT IPUT TER Mt lt lt lt a PROG WAIT A 5 a Response zz a PROG WAIT A omoonmnmomoogoo CZ GS SZ 8 PROG STAT CONT PUT Mta PROG STAT CONT a PROG STR Param STM 16 a PROG STR Command TEMPLATE a PROG STR Response The TEMPLATE command sets both input and output clock frequencies the jitter amplitude versus jitter frequency template and default values for all parameters listed under SAVE TEMPLATE 5 29 Programming Programming TOLERANCE The TOLERANCE command string performs the jitter tolerance measure ment Before performing a TOLERANCE measurement e Specify a template using TEMPLATE or CUSTOM e Set the clock frequency using INCLOCKFREQ e Perform a clock data align e Perform a calibration using CALINP The commands MARGIN REMOTEGATESEC TOLMODE BERTHRS TOLSEARCHFACTOR and TOLSEARCHFLAG may also be used to set up the TOLERANCE measurement Values of Program Variables Variable Data Type Value Command string TOLERANCE Param There are no parameters for this command Response string DONE ABORT ERROR Rpts floating point array of 28 see below rows and 4 columns a ABORTed if user presses EXIT key during measurement b ERROR is returned if a template has not been selected
186. s to produce the appropriate amount of phase modulation on the clock output of the clock source signal generator and therefore to the input data of the device under test Messages that may Occur during a Calibration During calibration several types of error or warning messages can appear on the display If either of the following two messages appear the input signal to the indi cated channel of the 708204 is too large To correct the condition reduce the signal and restart the calibration Error 6211 channel 1 hardware overrange Error 6212 channel 2 hardware overrange If error messages 480 and 490 appear this indicates a condition that does not need to be corrected The calibration routine automatically corrects these con ditions as they occur Error 480 Vco fll ool transient error Error 490 Nf pll ool transient error If SKIPPED appears in the template editor a template is loaded containing points at jitter frequencies outside the capability of the clock source these points will be skipped during calibration Rather than editing the values on these lines delete them and add new lines at frequencies within the clock source modulation frequency range Refer to Specifications and Character istics on page 6 1 If UI ADJUST appears in the template editor the Unit Intervals UI were automatically increased to meet the minimum level for a valid measurement If CAL FAILED appears the calibration routine could not achieve
187. spectrum displayed extends to 5 MHz the center of the screen The highest jitter frequency measurable in the Diagnostics menu is 5 MHz nt en 102 603 kHz 996 5 3 JITTER Setup Letti 142 683 kHz 3B7 3E 3 pk pk 2 426 ASPECTRA Jitter JITTER Trasfer T WAVEF RM Jitter CLOCK ee tant x SPECTRA Jitter CLOCK Generat A WRUEF RI Output JITTER Jitter l FREQ Diagnos ee Hz 881 05 kHz div 0 919 MHz Y re DG C2 5 Trh DGtCL 5 Mass dB div 3B dB div RUTDIRG Storage dB ref ref ON OFF Viewing the Jitter Spectrum 10 To determine the amplitude of a signal in this display format press MENU Markers select a marker Use the knob to adjust the position of the selected marker Marker values are displayed in The peak to peak value sometimes displayed in the top right area of the screen refers to previous measurements 3 44 11 Tutorials Tutorial 4 Diagnostic Measurements View the Jitter Waveform in Time Domain To view the demodulated waveform in the time domain press JITTER WAVEFRM If the AUTODIAG function is on the sweep rate is set so a few cycles of the modulation are displayed unless the jitter frequency is above 300 kHz When the jitter frequency exceeds 300 kHz more cycles will be displayed At high jitter levels fewer cycles are displayed When the AUTODIAG is on the jitter
188. t Diagnos is Hr 15 755 kHzzdiv 157 5 kHz Tr TA DC T Templat 35 dB div 35 dB div CAL Storage 3 5 dB ref 4 5 dB ref INPUT NOTE Each time the power is switched on to the 71501D the analyzer personality must be reloaded into memory This occurs automatically if the 70874D memory card is inserted in the front panel card slot before the instrument is switched on If the Program Does Not Load The program has failed to load if one of the following situations occurs The following message is never displayed Please wait Loading 2 46 Installation Step 5 Load the Personality Jitter Application Loading 70874D from EXTERNAL 904 Please wait The display is assigned to an instrument other than the 70820A The display mass storage is assigned to the GPIB device The left side softkeys match those shown in the following figure Nain Trigger Traces Markers a 1B8BE 3 div Page 70820A Module Main Menu To remedy this situation press DISPLAY Mass Storage msi MEMORY CARD MENU page 1 of 2 States more 1 of 2 mass storage msi MSIB CARD The active function will show MSIB column 4 The number should match the column number of the 70004A display whose card reader slot contains the jit ter analyzer personality card which is also 4 If the column number is incor rect key in the correct value and press ENTER
189. t appended to the standard prefixes allows you to indicate files that have similar data For example you may want to only see a catalog of mask files Each filename has the additional prefix of Shape The prefix appears regardless of the type of file you are saving The total length of your filename cannot exceed 10 characters for LIF and 8 characters for DOS This includes prefix and filename 4 45 Reference Memory Cards Disks and RAM To Catalog all Use this procedure to catalog default memory To select default memory refer Files to Selecting and Formatting Memory on page 4 39 1 Ifyou plan to catalog the files on a memory card insert the card in the front panel card slot 2 Display a catalog of the files by pressing MENU page 1 of 2 States more 1 of 2 mass storage Remember to insert the card before cataloging a memory card If the message 6218 catalog open failed is displayed the card is missing The MSIB address for the card is the same address as the display s GPIB address and is normally set to 4 If the address is not correct enter the correct address using the numeric keypad To Save a File Use this procedure to save a file in the default memory To select default mem ory refer to Selecting and Formatting Memory on page 4 39 1 Display the Mass Storage menu by pressing MENU page 1 of 2 States more 1 of 2 mass storage save 2 Perform one of the following e If you are saving an
190. t side slot Enter the disk drive s volume number by pressing VOLUME NUMBER The volume number should be left at the default value of zero for floppy disk drives Continue by pressing MENU page 1 of 2 States more 1 of 2 mass storage msi MSIB CARD Although CARD is selected the display s GPIB disk softkey pressed in Step 3 redirected communications to the GPIB disk drive 4 40 Memory Cards To Use a Memory Card Reference Memory Cards Disks and RAM Memory cards must be formatted before use Formatting erases any previ ously stored files and initializes memory for storing data Refer to To Initialize format a Memory Card on page 4 42 RAM memory cards have a built in battery to retain memory data Data stored in the card remain as long as the card s battery has sufficient power You should change the battery every two years using the procedure in this section Refer to To Change a Memory Card Battery on page 4 42 Error Message catalog open failed If no card is inserted in the front panel card slot and you attempt to catalog a memory card the display shows the message catalog open failed Place a card in the card slot and retry the operation The MSIB address for the card is the same address as the display s GPIB address and is normally set to 4 If the address is not correct enter the correct address using the numeric keypad Memory Card Write Protect Switch Memory cards have a write p
191. t to channel 2 of the 70820A must be 0 5 to 1 0 V peak to peak The signal level from the device under test output to either the N1015A or channel 1 of the 70820A must be 2 to 4 dBm 0 5 to 1V peak to peak If signals exceed this level use the 6 dB attenuator to reduce voltage levels 3 35 Optional Step NOTE Tutorials Tutorial 3 Jitter Generation and Output Set the low frequency rejection corner frequency Ifyou are making a jitter generation measurement press Jitter Generat LOWFREQ CORNER enter a value other than the default value then press ENTER 50 kHz for OC192 12 kHz for OC48 OC12 OC3 Acceptable values are 10 Hz 1 MHz e f you are making jitter output measurement press Output Jitter LOWFREQ CORNER enter a value other than the default value then press ENTER LOWFREQ CORNERZ enter a value other than the default value then press ENTER The output jitter measurement is measured in two bands with different high pass filter corner frequencies For example the default frequencies are 500 Hz and 65 kHz for 155 Mbits s 1 kHz and 250 kHz for 622 Mbits s 20 kHz and 1 MHz for 995 Mbits s 5 kHz and 1 MHz for 2488 Mbits s Limit the low frequency filter setting to 1 MHz Otherwise the jitter sensitivity will change when measuring higher frequencies High frequency rejection is provided by a hardware filter producing 1 25 MHz noise high frequency corner at 155 Mb s part num
192. tand alone models N4901A Serial BERT 50 MHz to 13 5 GHz N4902A Serial BERT 50 MHz to 7 GHz N4906A Smart BERT 3 6 Gb s 50 Mb s 3 6 Gb s 86130A BitAlyzer error analyzer Modular models 70843C option UHF error performance analyzer PART OF 71612C pattern generator and error detector 70843A B option UHF error performance analyzer OBSOLETE PART OF 71612A B pattern generator and error detector 71603A B error performance analyzer OBSOLETE 70841A B modular pattern generator OBSOLETE 70842A B modular error detector OBSOLETE 50 Mb s 3 6 Gb s 100 Mb s 12 5 Gb s 100 Mb s 12 Gb s 100 Mb s 3 Gb s a Standard instrument for the 71501D jitter analysis system b Recommended clock source for 3 Gb s applications c Instrument is not bundled with the 705010 jitter analysis system 2 8 Installation Introduction Table 2 2 Clock Source and Compatible Equipment Clock Source Compatible Error Performance Instruments E4422B RF signal generator 83752A microwave signal generator 83732A B synthesized signal generator N4906A Smart BERT 3 6 Gb s 86130A BitAlyzer error performance analyzer 70843A B C option UHF error performance analyzer component of 71612A B C pattern generator error detector 71603B error performance analyzer 70841A B modular pattern generator 70842A B modular error detector 70311A Option H08 signal generator 71603B error performance analyzer 70841A
193. ter 12 4416 Gb s 2 71501D Option 460 0955 1467 Low Pass Filter 12 4 GHz 2 71501D Option 467 0955 1394 Bandpass Filter 10 66423 Gb s 2 71501D Option 480 0955 1470 2 10 WARNING NOTE Installation Step 1 Inspect the Shipment Step 1 Inspect the Shipment Observe the notes cautions warnings and installation procedures in the documentation that was supplied with the individual instruments in the 71501D Inspect the shipping containers for damage Inspect the instruments Verify that you received the options and accessories you ordered In your 71501D system shipment there is a packing list that lists all of the items included in the shipment The accessory package contains many items that you will need to configure the equipment Pay particular attention to the 3 5mm female to 3 5 mm female connectors that you should put on the optional N1015A modulation test set ports as connector savers Keep the shipping container and cushioning material until you have inspected the contents of the shipment for completeness and have checked the instrument mechanically and electrically If anything is missing or defective contact your nearest Agilent Technologies Sales Office Refer to Returning the Instrument for Service on page 2 55 If the shipment was damaged contact the carrier then contact the nearest Agilent Sales Office Keep the shipping materials for the carrier s inspection The Agi
194. ters 15 000 ft Non operating Up to 5 600 meters 15 000 ft Weight 22 Ibs 10 kgm Dimensions Height 88 mm Width 425 mm Depth 498 mm 2 14 Table 2 6 Available Line Cords Installation Step 2 Install N1015A Optional Plug Type Cable Part No Plug Description ree Color Country 250V 8120 1351 Straight BS1363A 90 228 Gray United Kingdom Cyprus 8120 1703 90 90 228 Mint Gray NUM LE 250V 8120 1369 Straight NZSS198 ASC 79 200 Gray Australia New Zealand 90 8120 0696 87 221 Mint Gray 250V 8120 1689 Straight CEE7 Y11 79 200 Mint Gray East and West Europe f NM A 8120 1692 90 79 200 Mint Gray mo 8120 2857 Straight Shielded 79 200 Coco Brown nations 125V 8120 1378 Straight NEMA5 15P 90 228 Jade Gray United States Canada 8120 1521 90 90 228 Jade Gray PA Philippines 8120 1992 Straight Medical UL544 96 244 Blac 250V 8120 2104 Straight SEV1011 79 200 Mint Gray Switzerland 8120 2296 1959 24507 79 200 Mint Gray Type 12 90 220V 8120 2956 Straight DHCK107 79 200 Mint Gray Denmark 8120 2957 90 79 200 Mint Gray 250V 8120 4211 Straight SABS164 79 200 Jade Gray Republic of South Africa 8120 4600 90 79 200 India 100V 8120 4753 Straight MITI 90 230 Dark Gray Japan 8120 4754 90 90 230 Part number shown for plug is the industry identifier for the plug only Number shown for cable is the Agilent Technologies part number for the complete cable including the plug 2 15 CAUTION
195. tervals High pass filter cutoff frequency e 0 low sensitivity I high sensitivity 5 12 Example Example TER Mta A Lui DOBgSroelroo 20 T ct cC ccm 1 0 a PROG STR a PROG WAIT PUT Mta PROG STR Response ER Mta Response PUT Mta PROG NUMB Rnoise 1 to 7 Must read all 7 values TER Mta USING 96K Value l a PROG STAT CONT a PROG WAIT AS TPUT Mta PROG STAT CONT Programming Programming GENFC1 The GENFC1 command string sets the corner frequency Values of Program Variables Variable Command Data Type string Value GENFC1 Param floating point number 10 Hz to 4 5 MHz 10 to 4 5E6 Hz Response string DONE or ERROR a ERROR is returned if Param is outside the listed value range IPUT IPUT IPUT Mt TER M IPUT IPUT IPUT a PROG ST lt lt lt a PROG S1 Bg EB a PROG ST Omoomomooo 2 5 gt AS a PROG ST Response a PROG NUMB Param 1000 R Command GENFC1 a PROG WAIT Response CONT a PROG WAIT CONT 5 13 Example Programming Programming GENSWEEPS The GENSWEEPS command string sets the number of generation sweeps Values of
196. the Unit Intervals UI that were specified in the template 2 52 NOTE NOTE Installation To perform a system calibration Some modulation frequencies produce spurious sidebands on the output sig nal from some clock sources These sidebands may cause measurement or cal ibration errors 70311A Modulation frequencies within 40 kHz of an integer multiple of 200 kHz 83752A Modulation frequency near 3 98 MHz Press USER Setup CAL INPUT The calibration can take up to six minutes to execute When the calibration is finished the display will be similar to the following graphic Input Template Calibration Plot 57 16 LII 1 1 18 UE Modulation Frequency HZ CONT If you choose a template that exceeds the modulation capabilities of the clock source the system will adjust the template to modulation levels that are compatible with the source For example the minimum modulation rate of the 83752A is about 300 Hz The templates for 155 Mb s and 622 Mb s start below 300 Hz The 71501D will not attempt to operate the 83752A below 300 Hz In this case the starting point of the template will be adjusted to 316 Hz If the clock signal is not connected to input 2 of the 70820A or if the modulation signal is not connected to the clock source errors will occur when a calibration is attempted 2 58 NOTE Installation To rack mount the 71501D To rack
197. the time scale can be changed Automatically compensate channel 2 by pressing MENU page 1 of 2 Calib chan skew AUTO SKEW 4 31 Reference Calibrating the Analyzer Added delay Pulsgen Measure Tahle finaluze Calih States i 1 1 Trt Cht Page 3H mU div 8 af B V ref Tre Che 5B m div ref Example of Trace 2 Delay Compensated View the Calibration Data 1 Display the Traces menu by pressing MENU Traces BED ps div AUTO SKEW Tsecvory prey menu 2 To make viewing the calibration date easier turn all displayed traces off by pressing select display ON OFF OFF 3 Continue by pressing MENU 1 of 2 Calib IF calib cal debug show e f you want to view channel 1 data press CH1 CAL INFO f yo want to view channel 2 data press CH2 CAL INFO 4 To view additional pages of information continue pressing CHI CAL INFO or CH2 CAL INFO 4 32 IF Correction Data Traces Reference Calibrating the Analyzer RISE JEA SROH r COR FFT SHOW COR FIR Table tae Histagmy CHL cal stats pg 1 B press key again for more meia t Last cal 91 83 13 Palih LMiscel rev 4CH2 CAL T8710 gains std dev 12097 0 A12431 0 012342 INFO L H HHEBS1 BH 79 4 439467 4 L H H7HB13 H 852569 48 859926 States delay retrigsz
198. trace averaging Notice how the Param variable is loaded before the Command variable OUTPUT Mta PROG STR Param ON OUTPUT Mta PROG STR Command AVERAGEFLAG Use PROG STR to read response The 70874C pauses execution twice after completion of each command This provides a mechanism for synchronization between the issuance of a com mand and the retrieval of a response In your controlling program use the PROG WAIT query to determine when the 70874C has paused Then retrieve the response using the PROG STR query Use PROG STATe CONT to continue pro gram execution Notice the lower case letter e in PROG STATe This indicates the letter is optional Before sending the next command or its parameters wait until the jitter appli cation has cleared the remote programming variables by sending PROG WAIT a second time and by sending PROG STATe CONT when the wait ing is over The following example shows how to return response after a tolerance mea surement Notice that the TOLERANCE command does not use the Param vari able TPUT Mta PROG STR Command TOLERANCE TPUT Mta PROG WAIT AS TPUT Mta PROG STR Response ER Mta Response fter reading Response also read Rpts or Rnoise s appropriate for the command used UTPUT Mta PROG STAT CONT Acknowledge receipt of all results UTPUT Mta PROG WAIT Wait for variables to be cleared ENTER Mta A OUTPUT Mta PROG STAT CONT Now ready for the next co
199. trol is achieved by manipulating five 70874C program variables Variable Name Type Param numeric or string Command string Response string Rpts two dimensional numeric array 28 rows of 4 columns Rnoise one dimensional numeric array 7 values Each value returned consists of 19 characters Values are separated by com mas These variables may be set using the PROG STRing or PROG NUMber commands Their values may be obtained by using the query form PROG STRing or PROG NUMBer The Command string variable directs the 70874C to perform an action In some programming languages it is possible to read in the entire Rpts array and pause it later rather than enter each value separately 5 3 Programming Programming The jitter application checks for the arrival of a command only at the top level in the menu tree Therefore it will not see a command if the left side menus are not visible Load the Param variable with a parameter for the selected Command variable string Because execution begins immediately after Command is loaded load values into Param and Rpts before setting Command Param is actually two variables with the same name one is a string variable the other is a numeric variable Therefore the name Param can be used with both PROG STRing and PROG NUMber commands After execution of a command the Response string variable contains DONE ERROR or another indication of failure The following program shows how to turn on
200. tter level will be decreased until a level is reached where the DUT can maintain the desired BER For single point testing the jitter frequency and magnitude can be arbitrarily selected and a BER test performed All of these jitter tolerance tests may also be performed on multiplexing and de multiplexing devices If the DUT has no recovered clock output the source of the clock signal for the error performance analysis would be the same as what would be used for a conventional BER test as if no jitter were applied to the data For example the clock output of the pattern generator might be used as an input to the error detector 4 12 Jitter Tolerance Measurement Uncertainties and Accuracies Gating Time for Jitter Tolerance Measurements Reference Jitter Measurements The key measurement in a jitter tolerance test is BER The uncertainty of a BER measurement is dictated by the error performance analyzer and how it is configured Accuracy of the 71501D jitter analysis system involves precision in setting a specific jitter level The 71501D will typically set jitter to within 2 of the desired level Gating time is the time window during which the BER or the errored bits are monitored at each test point in a jitter tolerance test In a BER test the higher the number of errors the more accurate the test If the BER is very low a long gating time will be required Refer to Change the Default Gating Time on page 4 18 and
201. u can format memory and save recall erase and list catalog files using the mass storage menu located in the States menu RAM disks offer a convenient method of duplicating memory cards Refer to To duplicate a memory card in this section Up to 16 internal RAM disks can be created These are numbered 0 through 15 The default size of each RAM disk is 32 kilobytes Use Instrument BASIC s INITIALIZE statement to create each disk The fol lowing example creates RAM disk zero INITIALIZE MEMORY 0 0 128 The second integer 0 determines the RAM disk number The value 128 repre sents the size of the RAM disk in sectors Each sector consists of 256 bytes So a value of 128 sectors creates a RAM disk of 32 kilobytes A value of 512 sectors creates a RAM disk of 128 kilobytes Use the following command to create RAM disk 1 with a size of 128 kilobytes INITIALIZE MEMORY 0 1 512 RAM is volatile Because internal RAM is volatile all RAM disks are deleted when the power is turned off When this happens all files are lost and each RAM disk must be recreated To Use an Internal RAM Disk To invoke Instrument BASIC press USER If the eye diagram personality is loaded press USER again Enter an INITIALIZE statement to create a RAM disk For example enter the following BASIC statement INITIALIZE MEMORY 0 0 128 3 Select the internal RAM disk by pressing MENU page 1 of 2 States more 1
202. utput connector for FM input on a clock source The front panel LEDs indicate the status of the N1015A If the ERROR LED lights at any time other than during self test an error condition exists The other LEDs RMT remote LSN listen TLK talk and SWITCHING indi cate the normal functioning and do not indicate an error condition 10 Gb s 10 Gb s Dut Out Ch 1 MJA In Out Jitter Jitter POWER 2 5 Gb s 2 5 Gb s Modulation Modulation In Out In Out Figure 2 1 N1015A Front Panel 2 4 Rear Panel Installation Introduction Figure 2 2 on page 2 5 shows the N1015A rear panel The only rear panel con nector provided for the user is the GPIB port The factory default setting of the GPIB switch is 9 as shown in Figure 2 3 on page 2 5 The N1015A rear panel power line module contains the line fuse as shown in Figure 2 4 on page 2 6 If the fuse is bad replace it with the spare fuse Agilent part number 2110 1124 Service Connectors GPIB not used GPIB Address Switch CPU OUTPUT ELECTRONIC INSTRUMENT FOR LABORATORY USE BY QUALIFIED PERSONNEL CAUTION METRIC WARNING NO E SERVICEABLE PARIS DRIVER OUT Saee REFER SERVICING QUALFED PERSONNEL WARNING FOR CONTINUED ANE PROTECTION AGARET ERE IH SANE FPE AND RATING 22308 SHE TOW Power Line Module Figure 2 2 N1015A Rear Panel ADDRESS 1 HH SELLER
203. y column Afractional part equal to or greater than 0 5 selects the jitter amplitude UI p column 4 22 Reference Analyzer System Configuration and Setup 5 Change the selected value by pressing Edit Use the numeric keypad step keys or knob to alter the value For example to change the seventh jitter value row 7 column 2 to 4 UI press Select 7 5 ENTER Edit 4 ENTER You can edit other values by following the same procedure Be sure to press Select prior to editing another value otherwise the last value edited will still be selected and may be unintentionally modified 6 A template can contain a maximum of 28 test points If the template already has 28 test points you will have to delete a test point before adding a new one Highlight the test point to be deleted by pressing Select row ENTER Delete If you delete the last line on the current page select the previous line before pressing Delete again 7 Adda new jitter test point by selecting the frequency test point closest but less than or equal to the value to be added by pressing Add A new test point identical to the one selected will be added beneath it The new point can be edited using the procedure described earlier in Step 3 Jitter frequencies cannot be entered in decreasing order E 12 50 48 APR 22 1996 Pet Freq UI p p Status 1 50 d 1 5808 4 7 358 1 5BH ABA 1 5808 5 14 488 1 50 B 12 2RH 1 5BH 7 15 488 1 50 1
204. y or gain amplitude is changed 6 To re plot or list the same data with the new acceptance specification press trnsfer results gt PLOT TRNSFER or PLOT DELTA or LIST TRNSFER Notice that changing the corner frequency has changed the point at which the output specification rolls off as shown in the example below Jitter Transfer Plot STH 1h 18 m H J 14 i 1 o a a E Mi mit Laluu 7 UE 1 Modulation Frequency Hz CONT Display Showing New Corner Frequency 7 Return to the trace display by pressing Cont 3 10 Tutorials Tutorial 1 Jitter Transfer Measurements Change the Gain Amplitude Gain amplitude is the maximum allowable value of the jitter transfer function The default is 0 1 dB 8 Set the gain amplitude to 0 dB by pressing GAIN AMPLTD gt 0 The value can be entered using the knob step keys or numeric keypad Notice that changing the gain amplitude changed the specification against which the transfer function is plotted as shown in the example below This may be difficult to see in the jitter transfer plot but will be more apparent in the following data analysis Jitter Transfer Plot STH 1h 18 m H J 1 L 1 gH D a E A Luly L Lili l 7 UE Modulation Frequency Hz
205. y value up to 40 GHz less the max imum modulation frequency In the MUX DEMUX mode jitter generation and output jitter are measured on Input 1 of the 70820A at the output clock frequency Jitter transfer measurements are scaled by the ratio of the input clock fre quency to the output clock frequency This ensures the reported jitter transfer value is 0 dB for a perfect frequency multiplier or divider Input and output rates do not need to be harmonically related The jitter analyzer assumes the device under test input clock signal at input 2 of the 70820A is the same as the clock source frequency That is at the same frequency as the Inclk FREQ value The path between the clock source and input 2 of the 70820A cannot include any frequency dividers multipliers or translators The signal at input 1 of the 70820A should be the same as the OUTrate value Use appropriate bandpass filters on both inputs of the 70820A When measurements are made at low jitter modulation frequencies and when the measurements are made in the time domain the specified clock rate must be accurate 4 24 NOTE NOTE To Create Templates for Data Rates Other than 155 Mb s 622 Mb s 2488 Mb s or 9953 Mb s Reference Analyzer System Configuration and Setup For example if 2 UI is to be measured to within 0 1 UI at 10 Hz the clock fre quency must be entered accurately to within 2 x 0 1 x 10 2 Hz This required frequency accuracy also

Agilent 71501D Jitter Analysis System User`s Guide

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