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HP 4934A User's Manual

1. Contents 1 Getting Started Introduction 1 1 Switch On 1 1 Front Panel Features 1 2 Demonstrating the HP 4934A 1 5 Demonstration 1 1 5 Demonstration 2 1 6 Error Codes 1 7 Making Measurements Preliminary Setup 2 1 Connecting the HP 4934A to the Test Circuit 2 1 Dial and Hold 2 2 Dialing using the HP 4934A and a Butt in 2 3 Receiving an Incoming Call and Holding the Line 2 4 Level and Frequency 2 5 Principles 2 5 Instrument Operation 2 7 Message Circuit Noise 2 10 Principles 2 10 How itis Measured 2 11 Instrument Operation 2 12 Noise with Tone Notched Noise 2 13 Principles 2 13 How it is Measured 2 13 Instrument Operation 2 14 Signal to Noise 2 15 Principles 2 15 How itis Measured 2 15 ili Contents Instrument Operation 2 16 impulse Noise 2 17 Principles 2 17 Instrument Operation 2 18 P AR Peak to Average Ratio 2 21 Principles 2 21 How itis Measured 2 22 Instrument Operation 2 22 Noise to Ground 2 23 Principles 2 23 How itis Measured 2 23 Instrument Operation 2 24 3 General Information Introduction 3 1 About this Version 3 1 Specification 3 2 Safety Information 3 2 General 3 2 Safety Symbols 3 3 Statement of Compliance 3 5 Electromagnetic Compatibility EMC Information 3 5 Instruments Covered by Manual 3 7 Options Available 3 8 Accessories Supplied 3 9 Accessories Available 3 9 Specifications 3 10 Contents Installation Introduction 4 1 Initial Inspect
2. How it is Measured The measurement technique is similar to the message circuit noise measure ment but the input configuration is designed to respond to longitudinal sig nals The ground used as the signal reference is the sleeve of the test cord which is also connected to the instrument chassis and the power line ground Making Measurements 2 23 Instrument Operation A a Ga EEO E P PFT HTTP OFTEN WAP SAINI dim dB COMIN Edam LITHRESH Cents Ef Cik Oda pawn pa Ee EA EA E Ces Chroise NOISE Oh Tone SIE FO Those aie ete Oar Cenex DSO xetT During this measurement the transmitter is quiet terminated indicated by a decimal point in the left window when the display is in the TRMT mode RECEIVER 1 Use the MEAS key to select N T GND there will be a 10 second delay before the HP 4934A starts measuring Select the required filter using the FILTER key Display the received noise level using the DISPLAY key the RCV indicator will be lit The noise level in dBrn is in the left window If you select the C Message filter the result is in dBrnc 2 24 Making Measurements General Information Introduction This manual contains information which allows the user to operate and cali brate the Hewlett Packard Model 4934A Transmission Impairment Measur ing Set An HP 4934A and the accessories supplied are shown at the front of
3. 91 1 to 87 0 91 5 to 87 4 91 9 to 87 8 92 3 to 88 1 92 7 to 88 5 93 1 to 88 9 1 02329 to 97724 90 0 to 80 2 90 5 to 80 6 90 9 to 81 0 91 3 to 81 4 91 7 to 81 8 92 2 to 82 1 92 6 to 82 5 93 0 to 82 9 93 4 to 83 3 93 8 to 83 6 94 3 to 84 0 94 7 to 84 4 95 1 to 84 8 95 5 to 85 2 96 0 to 85 5 96 4 to 85 9 1 05925 to 94406 Performance Tests 5 29 CAUTION Receiver Frequency Range Accuracy SPECIFICATION Frequency Range 20 Hz to 110 kHz Frequency Accuracy 20 Hz to 9 999 kHz 0 5 Hz 10 kHz to 110 kHz 5 Hz DESCRIPTION An AC Calibrator and Frequency Counter are used to check the HP 4934A receiver range and accuracy EQUIPMENT AC Calibrator DATRON 4707A Frequency Counter HP 5315A PROCEDURE Ensure that the AC Calibrator OUTPUT is switched off or set to the minimum level before proceeding with the following procedure 1 Connect the equipment as shown in the following figure 2 Set the AC Calibrator output level to 0 7746 V then switch on the OUTPUT Set the AC Calibrator frequency to 20 Hz as observed on the Frequency Counter 5 30 Performance Tests Set the HP 4934A as follows Measurement LEVEL FREQ Receiver RCV Impedance 6009 Display Mode gt RCV Check the HP 4934A receiver frequency reading is between 19 Hz and 21 Hz Set the AC Calibrator frequency to each of the values given in the following table as observed on the Frequency Counter and check
4. Preparation for Use To avoid the possibility of injury or death the following precautions must be followed before the instrument is switched on A Note that the protection provided by grounding the instrument cabinet may be lost if any power cable other than the three pronged type supplied is used to couple the AC line voltage to the instrument B If this instrument is to be energized via an auto transformer to reduce or increase the line voltage make sure that the common terminal is connected to the neutral pole of the power source C The power cabie piug shali only be inserted into a socket outlet provided with a protective earth contact The protective action must not be negated by the use of an extension cord without a protective conductor grounding Power Requirements The instrument requires a power source of 90 to 126 V AC 48 to 66 Hz single phase If necessary the 4934A can be changed to 198 264 V AC 48 to 66 Hz using an internal switch Check instructions before doing so and ensure the correct fuse is used The power consumption is less than 20 VA Line Fuse The line fuse is located on the side panel For continued protection against fire hazard replace the line fuse only with the same type and line rating F 125mA 250V for 230V operation or F 250mA 250V for 15V operation The use of other fuses or materials is prohibited 4 2 installation Battery N CAUTION WARNING Power Cable This in
5. a RESPONSE OF 15 kHz FLAT FILTER 1000 2000 Okr ENCY Hg FPRERUENCY RESPONSE OF 50 kBIT FILTER TE a PHONE CIRCUIT aal 1 Atone end of the line the transmitter provides a quiet termination of the appropriate impedance 2 At the other end the receiver measures the noise via a weighting filter Noise levels are displayed in dBrn OdBrn 90dBm When the C Message filter is selected the noise is in units of dBrnC Making Measurements 2 11 Instrument Operation nical HEAS FILTER PSE jac Cidam ds IMN Chdte CTHRESH CMTS EJkhz Exe Clas Clentns m Bensa oM Heh 3 eit Cineise Gear osis Ge Nelse g k TONE gsis 70 NOISE WAN mpuise CIPRGM 1 CITIMER grue STOP wee aoe pgn sos E oe e PERIOD H e ATEND f f onir Cl erin CP HIGH EITRI r Ea Ea N SUT REVERSE co Ue Hoo TRME RCY ETBATTERY Boy TRT LOCKARGING JO ON ets amp o NG During this measurement the transmitter is quiet terminated indicated by a decimal point in the left window when the display is in TRMT mode RECEIVER Use MEAS to select NOISE Use FILTER to select the required filter Display the received noise level using the DISPLAY key the RCV indicator will be lit The noise level in dBrn is in the left window If the C Message filter is selected the resu
6. F21004 isplay Ha FA CORTE soker ES se sar Sg aes peso pispray poma HIED Eea ANRI HERES FILTER PULSE NOISE dam fea COMIN Cildim THRESH TICNTS Clete Clhe tiea ClentNe i Sun LQ pale FRE ie MSG jo 5 HIN on i A H EJNOISE a A Ip BMN D E i pprarse 5i i it 4 EEEN m Omar Cleon ChniGH f E A 4 Ronse i JePe ga sevens REVERSE 2 ee HOLD FRMF f 1 RC ONTO gen REY f J TRMT OLUME LEVEL STORE F3 2004 J lt STARE 56 JE ne d KEFF TOSIA A BRR PH eee ane cite te 2 4 3 1 5 1 Use the MEAS key to select NOISE W TONE TRANSMITTER 2 Display the transmitted level and frequency using the DISPLAY key TRMT indicator lit Level in dBm is in the left window The frequency fixed at 1004 Hz is in the right window 3 Set the level to 13 dBm using the OUTPUT LEVEL control RECEIVER Display the received noise level using the DISPLAY key RCV indicator lit Select the C MSG filter using the FILTER key Read the weighted noise in dBrnC in the left window The received frequency is in the right window 1 6 Getting Started Error Codes The error codes are described in the following table Err 1 to Err 6 Instrument faulty see Service Manual sign in right window Received holding tone level too high or too low check transmitted level or circuit under test I
7. 50 degrees centigrade The temperature for battery operation is 0 degrees centigrade to 50 degrees centigrade Humidity The instrument may be operated in environments with humidity up to 95 at 40 degrees centigrade However the instrument should also be protected from temperature extremes which may cause condensation within the instrument Altitude The instrument may be operated at altitudes up to 4 600m 15 000 ft Air Flow To provide adequate cooling an air gap of approximately 3 inches should be maintained around the instrument Cleaning To clean the module instrument Use a soft clean damp cloth to clean the front panel and clam shell covers This instrument is designed for use in Installation Category I and Pollution PERS 2 per IEC 61010 and 60644 respectively 4 4 Installation Noise Declaration LpA lt 70dB am Arbeitsplatz operator position normaler Betrieb normal position nach DIN 45635 pt 19 per ISO 7779 Storage and Shipment Environment The instrument may be stored or shipped in environments within the follow ing limits Temperature 40 degrees centigrade to 75 degrees centigrade without a battery and 20 degrees centigrade to 55 degrees centigrade with a battery Humidity 90 Altitude 15 300m 50 000 ft The instrument should also be protected from temperature extremes which may cause condensation within the instrument Packaging Tagging for
8. Gain Unity Filter 4 kHz L P 11 Set the AC Calibrator frequency to 100 Hz 12 Adjust the AC Calibrator output level until the reading on the AC Voltmeter is 0 7746 V NOTE Do not adjust the AC Calibrator output level for the remainder of the test 13 Set the AC Calibrator frequency to 10 kHz 14 Check that the reading on the AC Voltmeter is less than 0 2450 V Service Accessory 1 SA1 A 3 20 dB Ampilifier 4 kHz Filter St i ae a E aH i Le z LOW PASS 5 i a 26 Ri i i oe ouTeut A i AMPLIFIER 26 dR e on UNITY pees a GAIN t a 3 RS Gt k EE zh TE 3 Gus aS 12y Vv SAI Schematic Replaceable Parts Amplifier Filter Assembly 04935 60018 Capacitor 0 12uF 5 0160 3468 Capacitor 0 12uF 5 0160 3468 Capacitor 10k pF 1 0160 3548 Capacitor 1k pF 1 0160 2387 Diode 1901 0040 Diode 1901 0040 Resistor 600Q 40 1 2 0698 7408 Resistor 10 kQ 1 0757 0442 Resistor 10 KQ 1 0757 0442 Resistor 100 KQ 1 0757 0465 Resistor 10 kQ 42 0757 0442 A 4 Service Accessory 1 SA1 20 dB Amplifier 4 kHz Filter R6 R7 R8 R9 R10 Ril U1 S1 52 J J2 J3 J4 J5 Replaceable Parts Continued Resistor 100 KQ 1 Resistor 10 kQ 1 Resistor 42 2 KQ 1 Resistor 42 2 kQ 1 Resistor 2 87 KQ 1 Resistor 600Q 0 1 MC3400L Switch Switch Connector Binding Post Binding Post Binding Post BNC Connector 0757 0465 0757 0442 0698 3450 0698 3450 0698 3151 0698 740
9. IEC 61010 1 1990 A1 1992 A2 1994 CSA C22 2 No 1010 1 92 EN 60825 1 1994 IEC 825 1 1993 The product herewith complies with the requirements of the Low Voltage Directive 73 23 EEC and carries the CE marking accordingly South Queensferry Scotland 31 July 1998 bJ Ro Location Date W R Pearson Quality Manager Europe Contact Your Local Hewlett Packard Sales and Service Office or Hewlett Packard GmbH Department 2Q Standards Europe Herrenberger Strasse 130 D7030 Boblinger Fax 49 7031 143143 3 6 General information Instruments Covered by Manual Attached to the instrument is a serial number plate This serial number is in the form XXXXUXXXXX It is in two parts the first four digits and the let ter are the serial prefix and the last five are the suffix The prefix is the same for all identical instruments it changes only when a change is made to the instrument The suffix however is assigned sequentially and is different for each instrument The contents of this manual apply to instruments with the serial number prefix es listed under SERIAL NUMBERS on the title page An instrument manufactured after the printing of this manual may have a number prefix that is not listed on the title page The unlisted serial number prefix indicates the instrument is different from those described in this man ual The manual for this new instrument is accompanied by a Manual Changes supplement This supplement conta
10. Step 4 C Message Filter 300 Hz 600 Hz 1000 Hz 2500 Hz 5000 Hz 3 kHz Fiat Filter 400 Hz 1000 Hz 3000 Hz 6000 Hz 15 kHz Flat Filter 400 Hz 1000 Hz 15 000 Hz 30 000 Hz Program Filter 100 Hz 500 Hz 1000 Hz 2000 Hz 7000 Hz 10000 Hz Performance Tests 5 15 Table 1 5 8 5 9 5 42 5 43 5 10 Operation Verification Test Record Page Now TeDe Re 50 kBit Filter Step 12 50 Hz 1000 Hz 15000 Hz 25000 Hz 50000 Hz Impulse Noise Step 7 Low Count Step 8 Mid Count Step 9 High Count Noise to Ground Accuracy Step 4 65 17 V Step 5 8 2049 V 0 8205 V 82 049 mV 9 2061 mV Peak to Average Ratio Step 3 23 dBm Step 4 20 dBm 40 dBm Loss of Holding Tone Step 4 Err 7 displayed 5 16 Performance Tests Min 85 dBrn 89 dBrn 87 dBrn 86 dBrn 127 dBrn 109 dBrn 89 dBrn 69 dBrn 50 dBrn 90 dBrn 91 dBrn 91 dBrn 90 dBrn 69 dBrn 528 528 528 130 dBrn 112 dBm 92 dBrn 72 dBrn 53 dBm 102 102 102 Table 1 Operation Verification Test Record Min Actual Max 5 12 Hold Current Step 6 Current nominally 26 mA Performance Tests 5 17 Performance Tests The following procedures check the electrical performance of the HP 4934A to the specifications listed in Chapter 3 If any of the following tests fail carry out the adjustments described in Chapter 5 of the Service Manual If this fails to correct the problem refer t
11. 2600 Hz 150 Hz If SF SKIP is enabled the instrument automatically prevents the selection of frequencies in this range You can also change the SF SKIP center frequency see Page 2 9 14 STEP UP STEP DOWN and lt change the transmit frequency value in the LEVEL FREQ mode or the low threshold in the IMPULSE NOISE mode Use gt and lt to select the digit to change The selected digit is highlighted by a lit pointer Change the value of the selected digit using the STEP UP and STEP DOWN keys 15 PERIOD selects one of the four Impulse Noise measurement periods 16 DISPLAY displays the Impulse Noise measurement time or threshold count values Only the LOW SET threshoid value can be changed see Page 2 20 17 STOP allows the Impulse Noise measurement to be stopped without affecting the Impulse Noise counter Getting Started 1 3 18 START RESET sets the Impulse Noise counter to zero and starts the Impulse _ Noise measurement 19 FILTER selects one of the filters in the noise measurement modes C MSG 3 kHz FLAT 15 kHz FLAT PRGM 50 kBIT 20 MONITOR VOLUME controls the volume of the monitor speaker 21 In the LEVEL FREQ mode the blue keys F1 to F4 select preset frequencies At switch on these frequencies are F1 404 Hz F2 1004 Hz F3 2804 Hz F4 2713 Hz New frequencies can be assigned to F1 to F4 see Page 2 9 1 4 Getting Started fr Demonstrating the HP 4934A The fol
12. 40 5 dB DESCRIPTION An AC Voltmeter AC Calibrator and 20 dB Amplifier are used to check the HP 4934A transmitter flatness at 40 dBm over the frequency range 20 Hz to 85 kHz The 20 dB Amplifier is required to increase the 40 dBm level to within the specified range of the AC Voltmeter The amplifier provides a 600Q termina tion and is powered from a separate DC Power Supply If a high input impedance amplifier is used a 600Q termination is required Variations in the gain of the 20 dB Amplifier are compensated for at each of the test frequencies in the following procedure EQUIPMENT AC Voltmeter HP 3456A AC Calibrator DATRON 4707A 20 dB Amplifier SA1 see Appendix A Dual Output DC Power Supply HP 6234A PROCEDURE Ensure that the AC Calibrator OUTPUT is switched off or set to the minimum level before proceeding with the following procedure 5 24 Performance Tests 1 Connect the equipment as shown in the following figure AC CALIBRATOR A AL VOLTMETER CONNECT TO S44 Set the SA1 gain to 20 dB and filter to FLAT Set the AC Calibrator to 7 746 mV at 1000 Hz then switch on the OUTPUT Connect the AC Calibrator output to the input of SA1 and the SA1 output to the AC Voltmeter input Note the reading on the AC Voltmeter Set the HP 4934A as follows Measurement LEVEL FREQ Transmitter TRMT Impedance 600Q Display Mode TRMT Transmitter Frequency 1000 Hz Di
13. 50 dBm 53 dBrn P AR Accuracy Step 3 23 dBm Step 4 20 dBm 40 dBm 5 48 Performance Tests Software Downloading Introduction This chapter describes how to use a PC to download new operating software to the 4934A TIMS The basic procedure for downloading software is as follows Check the distribution diskette for readme files Connect a PC to the 4934A using a serial cable Put the 4934A into Download mode and set the baud rate Execute the download command on the PC The following section describes the procedure in detail Software Downloading 6 1 NOTE For 4934A pinout information see 4934A TIMS Serial Port Pinout in Chapter 7 For cable information see Cable Pinout in Chapter 7 Make sure your PC COM port is correctly set up to communicate with the 4934A NOTE Quick Download Procedure Be sure to check the distribution diskette for any readme files which may contain additional information and instructions about the download procedure SN Switch off the 4934A and connect the unit to the PC from which you will down load the software For a direct connection use a straight through RS 232 serial cable to connect the 4934A s serial port to a COM port on the PC For a dial up connection using modems use a null modem cable or adapter to connect the 4934A s serial port to the modem Set up the far end PC and modem as appropriate for your system
14. AC Calibrator output to the HP 4934A RCV port 2 Set the HP 4934A as follows Measurement IMPULSE NOISE Transmitter TRMT Impedance 6000 Receiver RCV Impedance 6000 Display Mode RCV Filter 15 kHz FLAT Period NON STOP Impulse Noise Display LOW SET 3 Set the AC Calibrator output level to 0 7746 V at 2 000 Hz then switch on the OUTPUT Set the LOW SET threshold to 75 dBrn Press START RESET to start the measurement Wait 60 seconds then press STOP Check the reading on the HP 4934A display is 480 48 counts Select the MID threshold Check the reading on the display is 480 48 counts oo N QO Select the HIGH threshold Check the reading on the display is 480 48 counts Performance Tests 5 9 Loss of Holding Tone 1 Connect the HP 4934A TRMT port to the RCV port 2 Set the HP 4934A as follows Measurement Filter Transmitter TRMT Impedance Receiver RCV Impedance Display Mode Transmitter Level NOISE W TONE C MSG 600Q 6009 TRMT 0 dBm 3 Set the Display Mode to RCV and remove the cable from the RCV port 4 Err 7 should be displayed in the right window 5 10 Performance Tests WARNING Hold Circuit Hazardous voltages are present during this procedure only service trained personnel aware of the hazards involved should perform the test EQUIPMENT DC Voltmeter HP 3456A DC Power Supply HP 6234A 1009 1 Res
15. Compatibility EMC Information This product has been designed to meet the protection requirements of the European Communities Electromagnetic Compatibility EMC directive 89 336 EEC In order to preserve the EMC performance of the product any cable which becomes worn or damaged must be replaced with the same type and specification General Information 3 5 Manufacturer s Name Hewlett Packard Ltd Manufacturer s Address Telecommunications Networks Test Division South Queensferry West Lothian EH30 9TG Scotland United Kingdom Declares that the product Product Name Transmission Impairment Test Set Model Numbers HP 4934A Product Options All This declaration covers all options of the above products as detailed in TCF A 59519852 02 Conforms with the protection requirements of European Council Directive 89 336 EEC on the approximation of the laws of the member states relating to electromagnetic compatibility Against EMC test specifications EN 55011 1991 Group 1 Class A and EN 50082 1 1992 As Detailed in Electromagnetic Compatibility EMC Technical Construction File TCF No A 59519852 02 Assessed by Dti Appointed Competent Body EMC Test Centre GEC Marconi Avionics Ltd Maxwell Building Donibristle Industrial Park KY11 5LB Scotland United Kingdom Technical Report Number 6893 2200 CBR dated 21 August 1997 Supplementary Information The product conforms to the following safety standards EN 61010 1 1993
16. STORE key Requires subsequent F4 F2 F3 or F4 command to complete action Does not work with SF SKIP Same as pressing the F1 404 key Same as pressing the F2 1004 key Same as pressing the F3 2804 key and START command Same as pressing the F4 2713 key and STOP command Remote Control 7 7 Query Commands Query commands retrieve measurements or other data from the 4934A HP 49344 TIMS Remote Query Commands Command Description UCS Returns unit configuration DISP Returns current results see below VERS Returns software version number SN Returns unit serial number ERR Returns last range error message see next page ID Returns HP 4934A Results Display DISP Format The DISP command returns results in one of two format depending on the current MEAS measurement mode For LEVEL FREQ NOISE NOISE W TONE SIG TO NOISE IMPULSE NOISE TRMT P AR and N T GND measurement modes the DISP command returns valuel value2 where valuel is the value displayed on the left display and value2 is the measurement displayed on the right display All levels and signal to noise ratio values include the tenths digit For IMPULSE NOISE RCV measurements the DISP command returns LL MM HH TT where LL is the count of impulse noise low threshold crossing MM is the count of middle threshold crossings HH is the count of high threshold crossings and TT is the timer value in m
17. and Frequency instrument Operation 2 7 2 9 Principles 2 5 2 6 Line Fuse 4 2 Loss 1004 Hz 2 5 Loss of Holding Tone Operational Verifi cation 5 10 M Mating Connectors 4 4 Measurements Impulse Noise 2 17 2 20 Level and Frequency 2 5 2 9 Message Circuit Noise 2 10 2 12 Noise to Ground 2 23 2 24 Noise with Tone 2 13 2 14 Notched Noise 2 13 2 14 P AR Peak to Average Ratio 2 21 2 22 Signal to Noise 2 15 2 16 Message Circuit Noise Accuracy Performance Test 5 34 Instrument Operation 2 11 Principles 2 10 2 11 Monitor Control 1 4 N Noise te Ground Accuracy Performance Test 5 41 Instrument Operation 2 24 Principles 2 23 Noise with Tone Instrument Operation 2 14 Principles 2 13 Notch Filter Rejection Performance Test 5 36 Notched Noise Instrument Operation 2 14 Principles 2 13 Q Operational Verification 5 3 5 13 Options Available 3 8 Output Level Control 1 3 P P AR Accuracy Performance Test 5 43 Instrument Operation 2 22 Principles 2 21 2 22 Performance Tests 5 18 5 44 Power Cable 4 3 Power Requirements 4 2 Preparation for Use 4 2 Preset Frequencies 2 7 PRGM Program Filter 2 10 Index Atte err er R Receiver Frequency Operational Verification 5 4 Frequency Range Accuracy Perfor mance Test 5 30 Level Operational Verification 5 5 Level Accuracy Performance Test 5 2 Receiver RCV Impedance 2 1 Receiving an Incomi
18. the OUTPUT Low Threshold Check 3 Set the HP 4934A as follows Measurement IMPULSE NOISE Receiver RCV Impedance 600Q Display Mode RCV Filter 15 kHz FLAT Period gt NON STOP Performance Tests 5 39 Set the Impulse Noise LOW SET threshold to 43 dBrn 5 Start the measurement by pressing START RESET the displayed count should remain at zero 6 Slowly increase the AC Calibrator output level until the HP 4934A starts counting the AC Calibrator level should be less than 3 456 mV 7 Press STOP to stop the low threshold check Mid Threshold Check 8 Set the AC Calibrator output level to 2 745 mV 9 Select the Mid threshold using the HP 4934A Impulse Noise DISPLAY key 10 Press START RESET to start the measurement the displayed count should remain at zero 11 Slowly increase the AC Calibrator output level until the HP 4934A starts counting the AC Calibrator level should be less than 5 477 mV 12 Press STOP to stop the Mid threshold check High Threshold Check 13 Set the AC Calibrator output level to 5 477 mV 14 Select the HIGH threshold using the HP 4934A Impulse Noise DISPLAY key 15 Press the START RESET key the displayed count should remain at zero 16 Slowly increase the AC Calibrator output level until the HP 4934A starts counting the AC Calibrator level should be less than 6 895 mV 17 Press STOP to stop the high threshold check 18 Repeat the above procedure for each of the LOW SET threshold set
19. the HP 4934A receiver frequency reading AC Calibrator Frequency HP 4934A Receiver Reading 1 000 Hz 999 to 1001 Hz 10 000 Hz 9 995 to 10 005 Hz 50 000 Hz 49 99 to 50 01 kHz 100 000 Hz 99 99 to 100 01 kHz 110 000 H 109 99 to 110 01 kHz ecirmrensnsren recessed ROSETTA PNAS SORES SSCS NHS AU Performance Tests 5 31 CAUTION Receiver Level Accuracy SPECIFICATION Input Level 40 dBm to 13 dBm Frequency Range 20 Hz to 50 Hz 1 dB 50 Hz to 200 Hz 40 5 dB 200 Hz to 15k Hz 02dB 15 kHz to 85 kHz 05 dB Level Accuracy at 1004 Hz 20 to 10 dBm 0 1 dB DESCRIPTION An AC Calibrator is used to check the HP 4934A receiver level accuracy EQUIPMENT AC Calibrator DATRON 4707A PROCEDURE Ensure that the AC Calibrator OUTPUT is switched off or set to the minimum level before proceeding with the following procedure 1 Connect the AC Calibrator output to the HP 4934A RCV port 2 Set the HP 4934A as follows Measurement LEVEL FREQ Receiver RCV Impedance 600Q Display Mode gt RCV 3 Set the AC Calibrator output level to 2 4495 V at 1000 Hz then switch on the OUTPUT Check the HP 4934A receiver level reading is between 9 9 and 10 1 dBm Set the AC Calibrator output level to 77 46 mV 5 32 Performance Tests Check the HP 4934A receiver level reading is between 20 1 and 19 9 dBm Set the AC Calibrator output level to 2 748 V at 20 Hz Check the HP 4934A receiver level reading i
20. the following procedure 1 Connect the equipment as shown in the following figure MER 5 34 Performance Tests 2 Set the HP 4934A as follows Measurement NOISE hes Filter C MSG Display Mode RCV Receiver RCV Impedance 600Q 3 Set the AC Calibrator output level to 2 1831 V at 1000 Hz then switch on the OUTPUT 4 Set the Decade Transformer to 1 0060000 Check the message circuit noise reading on the HP 4934A is between 98 and 100 dBm Set the AC Calibrator output level to 0 7746 V Check the reading on the HP 49344A is between 89 and 91 dBrn Set the Decade Transformer to each of the settings listed in the following table and check the HP 4934A noise reading Decade Transformer Settings dB HP 4934A Noise Reading 0 3162278 79 to 81 dBrn 0 1000000 69 to 71 dBrn 0 0316228 59 to 61 dBrn 0 0100000 49 to 51 dBrn 0 003 1623 39 to 41 dBrn 0 0010000 29 to 31 dBrn 0 0003 162 19 to 21 dBrn 0 000 1000 9 to 11 dBrn 0 0000562 2 to 8 dBrn Performance Tests 5 35 CAUTION Notch Filter Rejection SPECIFICATION Rejection 995 to 1025 Hz gt 50 dB DESCRIPTION An AC Calibrator is used to check the HP 4934A Notch Filter rejection EQUIPMENT AC Calibrator DATRON 4707A PROCEDURE Ensure that the AC Calibrator OUTPUT is switched off or set to the minimum level before proceeding with the following procedure 1 Connect the AC Calibrator output to the HP 4934A RCV port 2 Set the HP 4
21. you receive a call the butt in will ring Go off hook to receive the call To connect the HP 4934A transmitter to the line select TRMT HOLD then DIAL You can now transmit test signals along the line To re establish the speech path press DIAL To drop the line press TRMT HOLD 2 4 Making Measurements NOTE 10 Alternatively to connect the HP 4934A receiver to the line press RCV HOLD then REVERSE You can now receive test signals from the line To re establish the speech path press REVERSE To drop the line press RCV HOLD Level and Frequency Principles LEVEL FREQUENCY encompasses 4 related measurements loss attenua tion distortion gain slope and frequency All use the same measurement configuration 1004 Hz Loss This measurement is used to determine the point to point loss or gain of a channel at 1004 Hz 1004 Hz is transmitted instead of 1000 Hz to avoid mea surement errors caused by signals which are submultiples of the 8 kHz PCM sample rate 1 The transmitter sends 1004 Hz at the nominal data level usually 13 dBm0 2 The receiver measures the level and frequency of the received signal The loss is the difference between the transmitted and received levels If the channel is already terminated the receiver can measure the level via a high impedance input bridging mode Making Measurements 2 5 NOTE Attenuation Distortion Attenuation distortion defines the flatness
22. 01 kHz 100 01 kHz 110 01 kHz 10 1 dBm 19 9 dBm 12 dBm 5 45 Table 2 Performance Test Record Min Max Receiver Level Accuracy cntd Step 9 Step 11 Step 12 50 Hz 200 Hz 15 000 Hz 85 000 Hz 20 Hz 50 Hz 200 Hz 15 000 Hz 85 000 Hz Message Circuit Noise Accuracy Step 5 Step 7 Step 8 5 46 Performance Tests 10 5 dBm 10 8 dBm 10 8 dBm 10 5 dBm 41 dBm 40 5 dBm 40 2 dBm 40 2 dBm 40 5 dBm 98 dBrn 89 dBrn 79 dBrn 69 dBrn 59 dBrn 49 dBrn 39 dBrn 29 dBrn 19 dBrn 9 dBrn 2 dBrn 11 5 dBm 11 2 dBm 11 2 dBm 11 5 dBm 39 dBm 39 5 dBm 39 8 dBm 39 8 dBm 39 5 dBm Table 2 Performance Test Record Actual Notch Filter Rejection Step 4 995 Hz Step 5 1004 Hz 1015 Hz 1025 Hz Signal to Noise Ratio Accuracy Step 4 Step 5 Impulse Noise Threshold Accuracy Step 6 Count starts at 3 456mV Step 11 Count starts at 5 477mV Step 16 Count starts at 6 895mV Step 18 60 dBrn Low 15 455 mV 19 457mV Mid 24 495 mV 30 837mV High 38 822mV 48 874mV 80 dBrn Low 0 1546 V 0 1946V Mid 0 2449 V 0 3084V High 0 3882 V 0 4887V Performance Tests 5 47 Table 2 Performance Test Record j Actual Impulse Noise Threshold Accuracy cntd 100 dBrn Low 1 5455 V 1 9457V Mid 2 4495 V 3 0837V High 3 8822 V 4 8874V Noise to Ground Accuracy Step 4 65 17 V 127 dBrn 130 dBrn Step 5 8 2049 V 109dBm 112 dBm 0 8205 V 89 dBrn 92 dBrn 82 049 mV 69 dBm 72 dBrn 9 2061 mV
23. 10 to 45 dB Ratio Resolution 1 dB Accuracy signal 30 to 10 dBm S N 10 to 40 dB 1 dB S N 40 to 45 dB 2 dB Detector Types noise Quasi RMS tone Average 3 Level Impulse Noise Receiver Transmitter C Message or 3 kHz Flat receive filter selected 1004 Hz tone Any other receive filter off and terminated Level Range 40 to 10 dBm Notch Filter gt 50 dB rejection of levels lt 5 dBm gt 40 dB rejection of levels gt 5 dBm Frequency range 995 to 1025 Hz Threshold Ranges at 600 ohm Low 30 to 109 dBm Mid and High 4 and 8 dB higher respectively up to 109 dBrn Threshold Accuracy 40 dBrn 3 dB gt 50 dBrn 1 dB General Information 3 13 Loss of Holding Tone sign in right display latching Count Timer Nominaily 5 15 60 minutes or nonstop Count Range 0 to 9999 Max Count Rate Nominally 8 per second Noise to Ground Receiver Transmitter off and terminated Range 600 900 and 1200 ohm 50 to 130 dBrn Resolution 1 dB Accuracy 1 5 dB 60 130 dBrn 2 5 dB 50 60 dBrn Filters and Detector See message circuit noise P AR Transmitter Signal 16 frequencies in range 140 to 3890 Hz Level range 40 to 0 dBm Resolution 1 dB Receiver P AR Range 0 to 120 units Resolution 1 unit Accuracy 30 to 110 units 2 units Level Range 40 to 3 dBm RMS 135 and 150 ohm 30 to 8 dBm RMS Resolution 1 dB General Maximum DC Blec
24. 13 dBm Resolution 0 1 dB Detector Type Average Accuracy dB Frequency Hz Level nr dBm 20 50 50 200 200 15k 15k 60k 60k 85k 85k 110k 110k 200k f 13to 40 14 0 0 5 0 2 05 0 5 2 0 42 0 40to 60 1 3 0 6 0 4 0 8 1 0 2 0 2 0 At 1004 Hz 20 to 13 dBm 0 1dB Receiver accuracy is specified from 500 Hz when using the 135 or 150 ohm terminations Receiver accuracy specified when Transmitter frequency is lt 110 kHz t Frequency range 110k 200k applicable when Wideband option 021 is installed Message Circuit Noise Receiver Transmitter off and terminated Range 0 to 100 dbrn 135 amp 150 ohm 10 to 100 dBrn Resolution 1 dB Detector Type Quasi RMS Accuracy For 135 and 150 ohms 3 dB from 10 to 15 dBrn 1 dB from 15 to 100 dBrn For 600 900 1200 ohms 1 dB from 10 to 100 dBrn 3 dB from 0 to 10 dBrn Filters C Message 3 kHz Flat 15 kHz Flat Program 50 kbit 3 12 General Information Noise with Tone Receiver Transmitter 1004 Hz tone Notch Filter gt 50 dB rejection from 995 to 1025 Hz Range at 600 900 and 1200 ohm 10 to 100 dBrn Resolution 1 dB Accuracy 1 5 dB from 20 to 100 dBm 3 dB from 10 to 20 dBrn Detector Types noise Quasi RMS tone Average Filters C Message 3 kHz Flat 15 kHz Flat Program 50 kbit Signal To Noise Ratio Receiver Transmitter 1004 Hz tone Signal Level Range 600 900 and 1200 ohm 40 to 10 dBm Ratio Range
25. 3 to 61 7 73 8 to 58 6 67 3 to 64 3 69 7 to 62 1 74 3 to 59 0 67 7 to 64 7 70 1 to 62 5 74 7 to 59 4 68 2 to 65 1 70 5 to 62 9 75 2 to 59 7 68 6 to 65 5 71 0 to 63 3 75 6 to 60 1 69 0 to 65 9 71 4 to 63 6 76 1 to 60 4 69 4 to 66 3 71 8 to 64 0 76 5 to 60 8 69 8 to 66 6 72 2 to 64 4 77 0 to 61 1 70 2 to 67 0 72 7 to 64 8 77 4 to 61 5 70 6 to 67 4 73 1 to 65 1 77 9 to 61 9 71 0 to 67 8 73 5 to 65 5 78 3 to 62 2 71 4 to 68 2 73 9 to 65 9 78 8 to 62 6 71 8 to 68 6 74 4 to 66 3 79 2 to 62 9 72 2 to 69 0 74 8 to 66 7 79 7 to 63 3 72 7 to 69 4 75 2 to 67 0 80 1 to 63 6 73 1 to 69 8 75 6 to 67 4 80 6 to 64 0 73 5 to 70 2 76 1 to 67 8 81 0 to 64 3 73 9 to 70 6 76 5 to 68 2 81 5 to 64 7 74 3 to 70 9 76 9 to 68 5 81 9 to 65 1 74 7 to 71 3 77 3 to 68 9 82 4 to 65 4 75 1 to 71 7 77 7 to 69 3 82 8 to 65 8 75 5 to 72 1 78 2 to 69 7 83 3 to 66 1 75 9 to 72 5 78 6 to 70 0 83 7 to 66 5 76 3 to 72 9 79 0 to 70 4 Performance Tests 5 27 1dB 0 2 dB 40 5 dB Vout Gin mV at 20 Hz and 50 Hz at 200 Hz and 15 kHz at 60 kHz and 85 kHz 75 0 75 4 75 8 76 2 76 6 77 0 77 4 77 8 78 2 78 6 79 0 79 4 79 8 80 2 80 6 81 0 81 4 81 8 82 2 82 6 83 0 83 4 83 8 84 2 84 6 84 2 to 66 8 84 6 to 67 2 85 0 to 67 6 85 5 to 67 9 85 9 to 68 3 86 4 to 68 6 86 8 to 69 0 87 3 to 69 3 87 7 to 69 7 88 2 to 70 1 88 6 to
26. 70 4 89 1 to 70 8 89 5 to 71 1 90 0 to 71 5 90 4 to 71 8 90 9 to 72 2 91 3 to 72 5 91 8 to 72 9 92 2 to 73 3 92 7 to 73 6 93 1 to 74 0 93 6 to 74 3 94 0 to 74 7 94 5 to 75 0 94 9 to 75 4 5 28 Performance Tests 76 7 to 73 3 77 2 to 73 7 77 6 to 74 1 78 0 to 74 5 78 4 to 74 9 78 8 to 75 2 79 2 to 75 6 79 6 to 76 0 80 0 to 76 4 80 4 to 76 8 80 8 to 77 2 81 2 to 77 6 81 7 to 78 0 82 1 to 78 4 82 5 to 78 8 82 9 to 79 2 83 3 to 79 5 83 7 to 79 9 84 1 to 80 3 84 5 to 80 7 84 9 to 81 1 85 3 to 81 5 85 8 to 81 9 86 2 to 82 3 86 6 to 82 7 79 4 to 70 8 79 9 to 71 2 80 3 to 71 6 80 7 to 71 9 81 1 to 72 3 81 6 to 72 7 82 0 to 73 1 82 4 to 73 4 82 8 to 73 8 83 3 to 74 2 83 7 to 74 6 84 1 to 75 0 84 5 to 75 3 85 0 to 75 7 85 4 to 76 1 85 8 to 76 5 86 2 to 76 8 86 6 to 77 2 87 1 to 77 6 87 5 to 78 0 87 9 to 78 4 88 3 to 78 7 88 8 to 79 1 89 2 to 79 5 89 6 to 79 9 85 0 85 4 85 8 86 2 86 6 87 0 87 4 87 8 88 2 88 6 89 0 89 4 89 8 90 2 90 6 FACTOR 95 4 to 75 8 95 8 to 76 1 96 3 to 76 5 96 7 to 76 8 97 2 to 77 2 97 6 to 77 5 98 1 to 77 9 98 5 to 78 3 99 0 to 78 6 99 4 to 79 0 99 9 to 79 3 100 3 to 79 7 100 8 to 80 0 101 2 to 80 4 101 7 to 80 7 102 1 to 81 1 1 12202 to 89125 87 0 to 83 1 87 4 to 83 5 87 8 to 83 8 88 2 to 84 2 88 6 to 84 6 89 0 to 85 0 89 4 to 85 4 89 8 to 85 8 90 3 to 86 2 90 7 to 86 6
27. 8 1826 0712 3101 0973 3101 0973 1251 3677 1510 0076 1510 0076 1510 0076 1250 1780 Service Accessory 1 SA1 20 dB Ampilifier 4 kHz Filter A 5 A 6 Service Accessory 1 SA1 20 dB Ampilifier 4 kHz Filter _ NOTE Service Accessory 2 SA2 Power Splitter Adder Performance Test SPECIFICATION Characteristic Impedance 600Q Attenuation between any two ports 6 02 dB 0 05 dB at 40 Hz to 40 kHz EQUIPMENT AC Voltmeter HP 3456A Synthesizer HP 3336B Resistor 6002 0 01 HP 0811 3502 Do not uses an AC Calibrator in place of a Synthesizer with a 600Q balanced output or errors will occur PROCEDURE 1 Connect the equipment as shown in the following figure Service Accessory 2 SA2 B 1 Power Splitter Adder NO 1 Set the Synthesizer output level to 0 dBm at 200 Hz Adjust the Synthesizer output level until the reading on the AC Voltmeter is between 1 5420 V and 1 5491 V Connect the 600Q resistor across J2 and the AC Voltmeter across J3 Check the AC Voltmeter reading is between 0 7702 V and 0 7791 V Connect the AC Voltmeter across J2 and the resistor across J3 then repeat step 5 Repeat steps 2 to 6 with the Synthesizer frequency at 40 kHz HP Part No 0698 6323 1251 2533 1251 0600 03779 20045 RI to R6 Resistor Fxd 100Q 0 1 1 8 W J1 to J3 MSC MSC Connector 3 pin Connector single pin Blank Printed Circuit Board
28. 934A as follows Measurement NOISE W TONE Filter C MSG Receiver RCV Impedance 6000 Display Mode RCV 3 Set the AC Calibrator output level to 0 7746 V at 995 Hz then switch on the OUTPUT Check the reading on the HP 4934A is less than 40 dBrn Set the AC Calibrator to each of the frequencies in the following table and check the HP 4934A noise readings AC Calibrator Frequency HP 4934A Noise Reading 1004 Hz lt 40 dBrn 1015 Hz 1025 Hz 5 36 Performance Tests NOTE Signal to Noise Ratio Accuracy SPECIFICATION TRANSMITTER Holding Tone Frequency 1004 Hz fixed tone Other Specifications See LEVEL FREQ in the Specifications in Chapter 3 RECEIVER Filters C Message 3 kHz Flat 15 kHz Flat Program and 50 kBit all Notch Filter Signal Level Range 600 900 and 1200Q 40 to 10 dBm Signal to Noise Ratio Range Signal Level gt 30dBm 10to 45 dB Signal to Noise Ratio Accuracy 10 to 40 dB dB 40 to 45 dB 2 dB DESCRIPTION A Synthesizer and Power Adder SA2 are used to check the Signal to Noise Ratio accuracy Signal to Noise Ratio is the amplitude ratio of the holding tone to the background noise An 1800 Hz tone is used to simulate the noise and is added to the HP 4934A 1004 Hz holding tone using the Power Adder EQUIPMENT Synthesizer HP 3336B Power Adder SA2 see Appendix B Do not use an AC Calibrator in place of a Synthesizer with a 600Q balanced output or errors will occu
29. A accepts a command it returns OK to the controller Unknown commands cause the unit to return ERR Inappropriate commands are ignored HP 4934A TIMS Remote Control Commands Command Description RESET Resets unit to power on condition RMT Puts unit into remote mode disable front panel LCL Returns unit to front panel local control TRMT Same as pressing the TRMT key RCV Same as pressing the RCV key NORM Sets input jacks to TRMT RCV configuration as with REVERSE key REV Sets input jacks to RCV TRMT configuration as with REVERSE key T135 Sets Tx Impedance to 135 ohms as with the TRMT key T150 Sets Tx Impedance to 150 ohms T600 Sets Tx Impedance to 600 ohms T900 Sets Tx Impedance to 900 ohms T1200 Sets Tx Impedance to 1200 ohms R135 Sets Rx Impedance to 135 ohms as with the RCV key R150 Sets Rx Impedance to 150 ohms R600 Sets Rx Impedance to 600 ohms R900 Sets Rx Impedance to 900 ohms R1200 Sets Rx Impedance to 1200 ohms Remote Control 7 5 HP 4934A TIMS Remote Control Commands continued PEE a A nt A Command Description DIALON Sets DIAL key on DIALOFF Sets DIAL key off TERM Sets BRDG key off BRIDGE Sets BRDG key on THOLDON Sets the Tx HOLD key on THOLDOFF Sets the Tx HOLD key off RHOLDON Sets the Rx HOLD key on RHOLDOFF Sets the Rx HOLD key off Le Sets MEAS to LEVEL FREQ selection as with the MEAS key NOISE Sets MEAS to NOISE selection NWT Sets ME
30. AS to NOISE W TONE selection STN Sets MEAS to SIG TO NOISE selection IMN Sets MEAS to IMPULSE NOISE selection PAR Sets MEAS to P AR selection NTG Seis MEAS to N T GND selection CMES Sets FILTER to C MSG selection as with the FILTER key 3K Seis FILTER to 3 kHz FLAT selection 15K Sets FILTER to 15 kHz FLAT selection PROG Sets FILTER to PRGM selection 50KB Sets FILTER to 50 kBIT selection ae tet eae sige a a L 5M Sets Impulse Noise PERIOD to 5 MIN as with PERIOD key 15M Sets impulse Noise PERIOD to 15 MIN selection 60M Sets impulse Noise PERIOD to 60 MIN selection CONT Sets Impulse Noise PERIOD to NON STOP selection 7 6 Remote Control HP 4934A TIMS Remote Control Commands continued Command LOW MID HIGH TIMER START STOP LEV nnn FREQ nnnnnn THRESH nn ZERON ZEROFF SKIPON SKIPOFF STORE F1 F2 F3 F4 Description Sets Impulse Noise DISPLAY to LOW SET selection Sets impulse Noise DISPLAY to MID selection Sets Impulse Noise DISPLAY to HIGH selection Sets impulse Noise DISPLAY to TIMER selection Same as pressing the START RESET key Same as pressing the STOP key Acts as the OUTPUT LEVEL knob sets level to nn n dBm range 36 to 13 dBm Acts as frequency selection buttons sets frequency to nnnnnn Hz Acts as Impulse Noise LOW Threshold SET selection Sets LEVEL ZERO on Sets LEVEL ZERO off Sets SF SKIP on Sets SF SKIP off Same as pressing the
31. B 2 Service Accessory 2 SA2 Power Splitter Adder Index Numerics 15 kHz Flat Filter 2 10 3 kHz Flat Filter 2 10 50 kBit Filter 2 10 A Accessories Available 3 9 Accessories Supplied 3 9 Attenuation Distortion 2 6 2 9 B Battery 4 3 Battery led 1 2 Bridged Mode 2 1 C Charging led 1 2 C Message Filter 2 10 p Dial and Hold 2 2 Dialing Using a Butt In 2 3 E Error Codes 1 7 E Filters 15 kHz Flat 2 10 3 kHz Flat 2 10 50 kBit 2 10 C Message 2 10 Operational Verification 5 6 PRGM Program 2 10 Frequency Shift 2 6 Front Panel Features 1 2 1 4 Fuse 4 2 G Gain Slope 2 6 H Hoid Circuit Operational Verification 5 11 5 13 Hoiding a Line With a Butt in 2 4 Without a Butt In 2 4 I Impulse Noise Count Operational Verification 5 9 Instrument Operation 2 18 2 20 Principles 2 17 2 18 Setting Thresholds 2 19 Starting Stopping the Measurement 2 19 Threshold Accuracy Test 5 39 Timed Measurement 2 19 With a Holding Tone 2 18 Without a Holding Tone 2 18 Initial Inspection 4 1 Instruments Covered by Manual 3 7 Performance K Keys BRDG 1 2 DIAL 1 2 DISPLAY Impulse Noise 1 3 DISPLAY RCV TRMT 1 3 FILTER 1 4 HOLD RCV 1 2 HOLD TRMT 1 2 LEVEL ZERO 1 3 MEAS 1 3 ON STBY 1 2 PERIOD 1 3 RCV 1 2 REVERSE 1 3 SF SKIP 1 3 START RESET 1 4 STEP DOWN 1 3 STEP UP 1 3 STOP 1 3 TRMT 1 3 L Level
32. BIT TRUS NOISE LOW CIsHiN Lise OMNO gme Clsorin CHG Oi CL HMER B APER 1 2 Display the transmitted level and frequency using the DISPLAY key the TRMT indicator will be lit The level in dBm is in the left window The frequency in the right window is fixed at 1004 Hz 3 Set the transmitted level to the nominal data level using the OUTPUT LEVEL control RECEIVER 4 Display the received noise level using the DISPLAY key the RCV indicator will be lit Select the required filter using the FILTER key Read the weighted noise in dBrn in the left window If the C Message filter is selected the result is in dBrnC The received frequency is displayed in the right window 2 14 Making Measurements Signal to Noise Principles The signal to noise measurement determines the ratio of received signal plus noise power to noise power and gives a measure of the margin between the data signal and the background noise TER NOISE FOOTE 2 COMPARE froog Hz iy Derd NOTCH NORE ONLY POWER How it is Measured 1 The transmitter sends a 1004 Hz holding tone at the nominal data level 2 The receiver notches out the 1004 Hz holding tone and what is left is measured via a filter C Message 3 kHz Flat 15 kHz Flat Program or 50 kBit then compared with the original signal plus noise The computed ratio is displayed in dB Making
33. Carry out the procedure on Page 5 6 Message Circuit Noise Carry out the Performance Test on Page 5 34 Impulse Noise Carry out steps 1 to 17 in the Performance Test on Page 5 39 Impulse Noise Count Carry out the procedure on Page 5 9 Peak to Average Ratio P AR Carry out the Performance Test on Page 5 43 Loss of Holding Tone Carry out the procedure on Page 5 10 Hold Circuits Carry out the procedure on Page 5 11 Dynamic Hold Circuits Carry out the Performance Test on Page 5 13 Performance Tests 5 3 Receiver Frequency 1 Connect the HP 4934A TRMT port to the RCV port 2 Set the HP 4934A as follows Measurement __ LEVEL FREQ Transmitter TRMT Impedance 600Q Receiver RCV Impedance 6009 Display Mode TRMT Transmitter Level Frequency 0 dBm 20 Hz 3 Set the Display Mode to RCV Check the displayed frequency is between 19 and 21 Hz 4 Set the transmitter frequency Display Mode TRMT to each of the values in the following table and check that the displayed receiver frequency Display Mode RCV is within limits Transmitter Frequency Receiver Frequency 1 000 Hz 998 to 1002 Hz 50 000 Hz 49 99 to 50 01 kHz 110 000 Hz 109 99 to 110 01 kHz 5 4 Performance Tests Receiver Level 1 Connect the HP 4934A TRMT port to the RCV port 2 Set the HP 4934A as follows Measurement LEVEL FREQ Transmitter TRMT Impedance 600Q Receiver RCV Impedan
34. HP 4934A Transmission Impairment Measuring Set Operating and Calibration Manual SERIAL NUMBERS I pas This manual applies directly to instruments ae es with serial numbers prefixed 3648U l For additional important information about serial numbers see INSTRUMENTS COVERED BY MANUAL in Chapter 3 HEWLETT LA Packar HP Part No 04934 90054 Printed in U K November 1998 Copyright Hewlett Packard Ltd 1998 HP 4934A Transmission impairment Measuring Set and Accessories Supplied Instrument Description The HP 4934A is a wideband 20 Hz to 110 kHz 20 Hz to 200 kHz option 021 Transmission Impairment Measuring Set TIMS The transmission impairment measurements which can be made are listed below Level Frequency Noise Noise with Tone Signal to Noise Impulse Noise P AR Peak to Average Ratio Noise to Ground The HP 4934A can make measurements directly on leased lines or on dial up lines It has loop holding capability a monitor speaker and butt in connection useful for talking to the far end of the test line There are four permanently stored frequencies 404 Hz 1004 Hz 2804 Hz and 2713 Hz Any other four frequencies may be temporarily assigned or stored by the user The HP 4934A can test circuits using single frequency SF signaling use the SF SKIP feature SF SKIP prevents the HP 4934A from transmitting signaling frequencies in the range 2600 Hz 150 Hz
35. IENTS Elez Ethe Elda COCNTNG B sen Low 6 m mane z SED nose i JET e one ISHN FS Enie NEEE 516 Te CISOMIN DGH i A ay A A A A Onoise i ee EITANT TEP IMPULSE cohen Citines jos 5 on as Te a gt HD HOLD TRHF REY B Spo RCY j TENT LIBATTERY Pam A CcHaRemG oN Sa S stay i 316 310 21004 EF seoe CFT i START sre Reser jf S70 SS en Use MEAS to select P AR there will be a 10 second delay before the HP 4934A starts measuring TRANSMITTER 3 Display the transmitted P AR signal level in dBm in the left window using the DISPLAY key the TRMT indicator will be lit Set the transmitted level to the nominal data level using the OUTPUT LEVEL control RECEIVER 4 Display the received signal level in the left window and the P AR reading in the right window using the DISPLAY key the RCV indicator will be lit 2 22 Making Measurements Noise to Ground Principles This measurement determines the longitudinal common mode noise present on a circuit with reference to ground and is a measure of the sus ceptibility of the circuit to electrical coupling from external interference Often this interference is power line related and so is best measured using the 3 kHz Flat filter Common mode noise can be converted to transverse noise in the circuit by line imbalance Gee zo on w vs
36. Measurements 2 15 Instrument Operation ebm d3 COMIN dam CITHRESH COCNTS Cos 2 he ea COcNTNG osm cma EISOMN GHG TEL FLER N EPSE NOSE iG Loh FREQ mensh jo 5 MIN Agen in 3 kHz H A A NON Fa Ocjpp ates Cen at aji f F T EJ G e SF SKi ry FA psruar MONITOR Brae STOREN FS fear or 713 ETBATTERY TOE LEYE I TICHARGING i BE stor CO CA S mart 1 Use MEAS to select SIG TO NOISE TRANSMITTER 2 Display the transmitted level and frequency using the DISPLAY key the TRMT indicator will be lit Level in dBm is in the left window The frequency fixed at 1004 Hz is in the right window 3 Set the transmitted level to the nominal data level using the OUTPUT LEVEL control RECEIVER 4 Display the received signal to noise ratio using the DISPLAY key the RCV indicator will be lit Select the required filter using the FILTER key Read the signal to noise ratio in dB in the right window and the level of the received tone in dBm in the left window 2 16 Making Measurements Impulse Noise Principles Impulse noise includes noise spikes like the clicks and pops often heard on a telephone line The spikes are much higher in level than the background noise and generally last less than one millisecond The impulse noise measurement counts the number of noise spikes against 3 threshold levels simultaneously The low level threshold
37. Peak to Average Ratio Principles P AR is a good quick measure of the combined effect of impairments which produce intersymbol interference on a data signal for example phase delay distortion attenuation distortion intermodulation distortion and noise P AR cannot determine which impairment is causing the problem its value is primarily as a benchmark measurement to show up degradations with time in the transmission quality of a line A deviation of more than 4 P AR units from the benchmark value usually indicates that some characteristic of the channel has changed significantly 3130 825 1 390 828 3640 625 690 828 i i iu KE A Sf B 390 625 G 840 626 D 580 625 140 925 F 1390 625 1 G 1640625 H 880 825 10i BO a TIME m area eT eT te oo cm PIAR WAVEFORM HItJKLELM 2000 3000 FREQUENCY Hz ME bev P R SPECTRUM Making Measurements 2 21 How it is Measured 1 The transmitter sends a complex signal which approximates a modem signal 16 frequencies with a known envelope shape 2 From the received signal envelope the receiver calculates the peak to average ratio This is compared with the known peak to average ratio of the transmitted signal A scaling factor ensures that a P AR of 100 indicates no signal degradation Instrument Operation errs sant en ER sa 5 3 fee MRSE NOISE Eidam 63 PINN Fsm CITHRESH C
38. Service If the instrument is being returned to Hewlett Packard for service please complete one of the blue repair tags located at the front of the service manual if you have one or give details on a label then attach the tag or label to the instrument Original Packaging Containers and material identical to those used in the factory packaging are available through Hewlett Packard offices If the Installation 4 5 instrument is being returned to Hewlett Packard for servicing attach a tag indicating the type of service required return address model number and full serial number Also mark the container FRAGILE to ensure careful handling Other Packaging The following general instructions should be used for repacking with commercially available materials a Wrap instrument in heavy paper or plastic If shipping to Hewlett Packard office or service center attach a tag indicat ing type of service required return address model number and full serial number b Use strong shipping container A double walled carton of 35 pound test material is adequate e Use a layer of shock absorbing material 70 to 100 mm 3 to 4 inch thick around all sides of the instrument to provide firm cushioning and prevent movement inside the container Pro tect the control panel with the front cover provided or with cardboard d Seal shipping container securely e Mark the shipping container clearly f In any correspondence refer to instrume
39. Switch on the 4934A and promptly press the START RESET key during the star tup routine while the serial number is being displayed When the unit is in Download mode the left display shows dl and the right dis play shows the installed software revision Use the RCV key to set the 4934A s baud rate for the download procedure Each time you press RCV the right display shows the currently selected baud rate The baud rate for software download can be set to 1200 2400 9600 19200 or 38400 defaults to 9600 at power up At the PC insert the distribution diskette into the A or B floppy drive From a DOS prompt select the drive by typing A or B and then press return Next type DOWNLOAD and then press return Press a key to begin the download or press Esc to cancel If you interrupt the download program the 4934A will be inoperable until a successful download is performed 8 When the download is complete the 4934 reboots The software revision is dis played on the right display at start up 6 2 Software Downloading You can type DOWNLOAD to get help with this command Each software OUT file is keyed to individual 4934A serial numbers A particular copy of a OUT file may be valid for only one or several test sets depending on your requirements About the DOWNLOAD Program The DOWNLOAD EXE executable file is included on the distribution diskette when you receive your op
40. and usable bandwidth of the cir cuit i The transmitter usually sends 1004 Hz at the nominal data level The level received at this frequency is set as the reference level 2 The transmitter is stepped through a range of spot frequencies over the channel bandwidth At each frequency the receiver displays the difference between the level at the reference frequency and the level received Gain Slope This is a quick method for assessing the flatness of a channel using only three frequencies two of which are close to the edges of the channel band width The level measured at 1004 Hz is the reference level then the attenu ation is measured at 404 Hz and 2804 Hz relative to the reference level Frequency Frequency shift can occur over facilities such as FDM carrier systems and is measured by comparing the frequency sent into the channel with the fre quency received at the far end of the channel The calculation of frequency shift may not be valid when measured on looped around carrier facilities since the frequency shift in one direction may be canceled by frequency shift in the return direction 2 6 Making Measurements Instrument Operation 5600 isoo i a0 oo HOLS fra TRF im BEY REY fom TRIE Pyearieny ae 7 TESE ki E r o SMN Olsen CHSMN Clm alee a Hens NOISE Sha tone H SEG TO Od oise cae p PULSE uP NOISE i Ss ce sa Wai NEGUS t ae ear
41. ating Remote Mode 7 4 Control Commands 7 5 Query Commands 7 8 Results Display DISP Format 7 8 Range Error Messages 7 9 A Service Accessory 1 SA1 20 dB Amplifier 4 kHz Filter Performance Test A I B Service Accessory 2 SA2 Power Splitter Adder Performance Test B 1 vii te E AA a t mann a AAE nn nn A nea Contents vili CAUTION Getting Started Introduction This chapter aims to get you ready to make measurements It takes you through switch on introduces operating features and provides simple proce dures to demonstrate how easy the HP 4934A is to use Switch On Before switching on this instrument make sure that the line voltage selector switch is set to the voltage of the power supply and the correct fuse installed Assure the power supply voltage is in the specified range Switch on the HP 4934A by pressing the ON STBY key The instrument automatically does a self test check at power on takes approximately 10 seconds During this time all front panel indicators and displays will light except for the CHARGING and BATTERY indicators When the self test is complete the instrument starts measuring LEVEL FREQ Both display windows momentarily blank then a minus sign and period appear in the left window followed by the transmitter level in dBm The right window displays 1004 Hz If any of the self tests fail at power on an error code see Page 1 7 is dis played brie
42. ce 6009 Display Mode TRMT Transmitter Level Frequency 0 dBm 1004 Hz 3 Set the Display Mode to RCV Check the displayed level is between 0 2 and 0 2 dBm Set the transmitter level to 19 dBm Display Mode TRMT Check that the received level Display Mode RCV reading is between 19 2 and 18 8 dBm Performance Tests 5 5 rt tt ttt Weighting Filters EQUIPMENT AC Calibrator DATRON 4707A CAUTION Ensure that the AC Calibrator OUTPUT is switched off or set to the minimum level before proceeding with the following procedure 1 Connect the AC Calibrator output to the HP 4934A RCV port C Message Filter 2 Set the HP 4934A as follows Measurement NOISE Transmitter TRMT Impedance 600Q Receiver RCV Impedance 600Q Display Mode RCV Filter gt C M5G 3 Set the AC Calibrator output level to 0 7746 V then switch on the OUTPUT NOTE Do not adjust the AC Calibrator output level during the remainder of this test 4 Set the AC Calibrator to each of the frequencies listed in the following table and check the HP 4934A noise readings AC Calibrator Frequency HP 4934A Noise Reading 300 Hz 71 to 77 dBrn 600 Hz 83 to 87 dBm 1 000 Hz 89 to 91 dBm 2 500 Hz 87 to 91 dBrn 5 000 Hz 57 to 65 dBrn a a T o a a E a a 5 6 Performance Tests 3 kHz Flat Filter 5 Select the 3 kHz FLAT filter 6 Set the AC Calibrator to each of the frequencies in the following table and check the HP 4934A
43. connected To test a dial up line or talk over the test line connect a butt in to the T and R DIAL binding posts 1 2 Getting Started TRMT selects the transmitter source impedance RCV selects the receiver terminating impedance or in bridged mode selects the impedance of the circuit under test 8 REVERSE interchanges the TRMT and RCV function of the two 310 ports The indicators above the ports show the current function 9 DISPLAY selects either the received or transmitted parameters for display The TRMT and RCV indicators above the DISPLAY key show which parameters are being displayed 10 MEAS selects the following measurements LEVEL FREQ level frequency measurements NOISE noise measurements NOISE W TONE noise with tone measurements SIG TO NOISE signal to noise measurements IMPULSE NOISE impulse noise measurements P AR peak to average ratio measurements N T GND noise to ground measurements 11 OUTPUT LEVEL sets the transmitter output level 12 LEVEL ZERO allows relative level measurements in the LEVEL FREQ mode The displayed received signal becomes the 0 dB reference when you press LEVEL ZERO All subsequent results are relative to this reference The displayed results are a measure of loss that is a higher level than the reference is indicated by a sign This is standard in the telephone industry 13 SF SKIP prevents the instrument from transmitting signaling frequencies in the range
44. d Annn Specifies the COM port s base address in hexadecimal notation where each digit of nnn can be 0 through F For example A3F8 sets the base address for 3F 8h If no base address is specified the base addresses 3F8 2F8 3E8 and 2E8 are used for COM 1 through COM4 respectively Software Downloading 6 3 6 4 Software Downloading Remote Control Introduction The 4934A TIMS can be controlled remotely through its RS 232 serial port When connected to a controller for example a PC running a terminal emulation program the unit can be operated just as if the front panel controls were being used The TIMS is operated using a set of control commands to set parameters execute tests and so forth A set of query commands is used to retrieve measurements for display on the controller device Remote Control 7 1 The Serial Port The serial port is on the 4934A s right side above the AC connector Your unit will have a serial port if a 200 kHz option is installed This port is used for remote control see page 7 1 and for downloading software see Software Downloading page 6 1 Serial Port Type The serial port is a DB 9S 9 pin socket connector The 4934A acts a DTE device if you are connecting to a DCE device you can use a straight through cable see Cable Pinout page 7 3 To connect another DTE device a null modem must be used The pinout of the serial port is as follows 4934A TIMS Serial Por
45. e of the transmitted frequency in the right window using the lt STEP UP and STEP DOWN keys Single Frequency SF Signaling 7 Press SF SKIP to prevent the instrument from transmitting signaling frequencies in the range 2600 Hz 150 Hz Changing the SF Skip Center Frequency 8 Disconnect the transmit side of the line from the test set first to avoid dropping the circuit 9 Set the new frequency in the right window 10 Press STORE followed by SF SKIP The SF SKIP center frequency 2600 Hz is re established at power on or when the measurement mode is switched between P AR and N T GND 2 8 Making Measurements RECEIVER 11 Display the received level and frequency using the DISPLAY key RCV indicator will be lit Receiver Reference 12 If attenuation relative to a reference is required press LEVEL ZERO when the reference signal is present and stable for attenuation distortion measurements this is normally at 1004 Hz This changes the level reading from an absolute value in dBm in the left window to a relative attenuation value in dB All subsequent received level readings will be relative to this value A negative reading indicates a level higher than the reference level Pressing LEVEL ZERO a second time changes the level reading back to absolute units in dBm To change the transmitted frequency return to step 2 NOTE Error Codes will be displayed if the input level to the receiver is too h
46. eneral Information 3 3 Safety Symbols WARNING Warning denotes a hazard It calls attention to a procedure which if not correctly performed or adhered to could result in injury or loss of life Do not proceed beyond a warning note until the indi cated conditions are fully understood and met CAUTION Caution denotes a hazard It calls attention to a procedure which if not correctly performed or adhered to could result in damage to or destruction of the instrument Do not proceed beyond a warn ing note until the indicated conditions are fully understood and The CE mark shows that the product complies with all relevant European legal Directives accompanied by a year it s when the This is a symbol of an Industriai Scientific and Medical Group 1 Class A product The CSA mark is a registered trademark of the Canadian Stan dards Association Indicates a functional earth terminal The recycling symbol The dispose of properly symbol 3 4 General information Li i I a e Nd Statement of Compliance This instrument has been designed and tested in accordance with IEC Publication 1010 1 A1 1992 A2 1995 Safety requirements for Electrical Equipment for Measurement Control and Laboratory Use and has been supplied in a safe condition The instruction documentation contains information and warnings which must be followed by the user to ensure safe operation and to maintain the instrument in a safe condition Electromagnetic
47. erating software upgrade While simply typing DOWNLOAD to execute the program is adequate for most applications the DOWNLOAD program accepts several variables that modify its operation for special cases The full format for the download command is as follows DOWNLOAD filename ext Pn In Bnnnn Annn The parts of the command are described below DOWNLOAD The root command Starts the software download process If no parameters are specified the default values are used see below which is equivalent to typing DOWNLOAD P1 14 B38 4 A3F8 filename ext Selects the software file to be downloaded Operating software files end with the extension OUT If no file is specified the program downloads the first file in the working directory that has the OUT extension Distribution diskettes include only one software file so it is rare that you would need to use the file name in the download command Pn Specifies the COM port to be used on the PC where n is 1 through 4 For example P3 selects COM3 If no port is specified COM1 is used In Specifies the system interrupt request line IRQ for the COM port where n is 1 7 For example 14 selects IRQ 4 If no IRQ is specified IRQ 4 is used for COM1 and COM3 and IRQ 3 is used for COM2 and COM4 Bnnnn Specifies the baud rate for the COM port where nnnn is 1200 4800 9600 19 2 or 38 4 For example B19 2 sets the baud rate to 19 2 Kbaud If no baud rate is specified 38 4 Kbaud is use
48. erator as follows Function Sine Frequency 1004 Hz Adjust the Function Generator output level until the HP 4934A RCV display reads 0 dBm approx 10 8 dBm on the HP 3325A Do not adjust the Function Generator output level for the remainder of this test 4 Select RCV HOLD on the HP 4934A Set the Function Generator DC Offset level to 3 9V Check the reading on the HP 4934A RCV display is 040 3 dBm Set the Function Generator DC offset level to 3 9V Check the reading on the HP 4934A RCV level display is 0 0 3 dBm O N Oo A Performance Tests 5 13 Hewlett Packard Model 4934A Transmission Impairment Measuring Set Tested by Date Serial No Table 1 Operation Verification Test Record Transmitter Frequency Accuracy Step 3 20 Hz Step 4 1000 Hz 50 000 Hz 110 000 Hz Transmitter Level Accuracy Step 4 0 dBm Step 5 5 dBm 10 dBm 19 dBm Receiver Frequency Step 3 20 Hz Step 4 1000 Hz 50 000 Hz 110 000 Hz Receiver Level Step 3 0 dBm Step 5 19 dBm 5 14 Performance Tests Min 19 999 Hz 999 95 Hz 49 997 35 Hz 109 986 8 Hz 0 7657 V 0 4306 V 0 2421 V 0 0859 V 19 Hz 998 Hz 49 99 kHz 109 99 kHz 0 2 dBm 19 2 dBm Max 20 001 Hz 1000 05 Hz 50 002 5 Hz 110 013 2 Hz 0 7836 V 0 4406 V 0 2478 V 0 0879 V 21 Hz 1002 Hz 50 01 kHz 110 01 kHz 0 2 dBm 18 8 dBm Table 1 Operation Verification Test Record Test Description Weighting Filters
49. et the AC Calibrator output level to 65 17 V at 1000 Hz then switch on the OUTPUT Check the reading on the HP 4934A display is between 127 and 130 dBrn Set the AC Calibrator output level to each of the values in the following table and check the N T GND reading on the HP 4934A display AC Calibrator Setting N T GND Reading 8 2049 V 109 dBrn to 112 dBrn 0 8205 V 89 dBrn to 92 dBrn 82 049 V 69 dBrn to 72 dBrn 9 2061 V 50 dBrn to 53 dBrn 5 42 Performance Tests Peak to Average Ratio P AR Accuracy SPECIFICATION TRANSMITTER Signal Spectrum 16 Frequencies 140 Hz to 3890 Hz Level 40 to 0 dBm Level Resolution 1 dB RECEIVER P AR Range O to 120 P AR Units Resolution 1 P AR Unit Accuracy 30 to 110 P AR Units 2 P AR Units PROCEDURE 1 Connect the HP 4934A TRMT port to the RCV port using a short cable 2 Set the HP 4934A as follows Measurement P AR Transmitter TRMT Impedance 6002 Receiver RCV Impedance 600Q Display Mode TRMT Transmitter Level 23 dBm 3 Set the Display Mode to RCV Check the reading on the HP 4934A display is between 98 and 102 P AR Units 4 Set the transmitter level to each of the values in the following table and check the P AR teadings in the RCV display mode Output Level P AR Reading 20 dBm 98 to 102 P AR Units 40 dBm 98 to 102 P AR Units Performance Tests 5 43 Hewlett Packard Model 4934A Transmission Impairment Measuring Set L
50. evel 11 Use the Impulse Noise DISPLAY key to display the resulting MID and HIGH threshold values These are 4 dB and 8 dB greater than the low threshold value up to a limit of 109 dBrn Starting Stopping the Measurement 12 Press START RESET to set the impulse noise counters to zero the CNTS and CNTNG indicators will light and start the measurement 13 Use the IMPULSE NOISE DISPLAY key to select TIMER If you select a timed measurement 5 15 or 60 minute period in step 8 when you press START RESET the time shown in the left window will decrement in 1 minute intervals to zero the measurement then automatically stops If you select NON STOP in step 8 when you press START RESET the time starts from zero and increments in one minute intervals Press STOP to end the measurement Making Measurements 2 19 NOTE During a timed measurement you can check the current LOW MID and HIGH threshold count by using the DISPLAY key After checking the counts ensure that the instrument is set to TIMER again 14 When the measurement is complete the impulse noise count is in the right window the CNTS indicator will be lit A sign in the right window indicates a loss of received holding tone impulse noise with holding tone measurement only NOTE Selecting a new filter during the measurement causes the measurement to stop running 2 20 Making Measurements AMPLITUDE dB P AR
51. f design manufacture and intended use of the instrument Hewlett Packard Company assumes no liability for the customer s failure to comply with these requirements This is a Safety Class I instrument provided with a protective earthing ground incorporated in the powercord 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 DO NOT operate the product in an explosive atmosphere or in the presence of flammable gasses or fumes DO NOT use repaired fuses or short circuited fuseholders For continued protection against fire replace the line fuse s only with fuse s of the same voltage and current rating and type DO NOT perform procedures involving cover or shield removal unless you are qualified to do so Operating personnel must not remove equipment covers or shields Procedures involving the removal of covers and shields are for use by service trained personnel only DO NOT service or adjust alone Under certain conditions dangerous voltages may exist even with the equipment switched off To avoid dangerous electrical shock service personnel must not attempt internal service or adjustment unless another person capable of rendering first aid and resuscitation is present DO NOT operate damaged equipment Whenever it is pos
52. fly in the right window during self test Getting Started 1 1 Front Panel Features Cem Elas FMN Oda 5 m FILTER TRPOLSE NOISE 7 imik PO ee e 1 vf REQ E Ocnse Osmi ole iCNoise Dalat HSMN comin i NOISE Oy 5 TONE f ry S KH sieta Cleat Teo nN NOISE XON mpige pace Grop TER Qj NOISE Frage VFA 50 KBIT DISPLAY t LIHIH ey i VOLUME LEVEL 12 1 ON STBY powers up the complete instrument In the STBY standby mode only some circuits have power When a battery is fitted the ON STBY key has the following indicators associated with it BATTERY indicates the instrument is powered from the internal battery During battery operation connect the chassis terminal on the side panel to earth ground CHARGING indicates the instrument is in the STBY standby mode with AC power connected and the battery is charging 2 HOLD RCV connects the receive hold circuit to the RCV port when testing dial up lines 3 HOLD TRMT connects the transmit hold circuit to the TRMT port when testing dial up lines 4 BRDG selects a high input impedance gt 50 kQ for testing lines that are already terminated In BRDG bridged mode it is still necessary to use the RCV key to select the terminating impedance for the line you are testing This ensures that the HP 4934A will display the correct results 5 DIAL connects the T tip and R ring binding posts to the TRMT port transmitter dis
53. g Tone 2 3 Select either the C Message or 3 kHz Flat Filter using the FILTER key Display the transmitted level and frequency using the DISPLAY key the TRMT indicator will be lit Level in dBm is in the left window The frequency fixed at 1004 Hz is in the right window Set the transmitied level to the nominated data level using the OUTPUT LEVEL control Impulse Noise without a Holding Tone 5 Select either the 15 kHz Flat PRGM or 50 kBit Filter using the FILTER key The 2 18 Making Measurements NOTE transmitter is quiet terminated indicated by a decimal point in the left window when the display is in the TRMT mode RECEIVER 6 Use DISPLAY to select the RCV display mode 7 Select the required filter using the FILTER key If you are doing a loopback test the filter selection has already been made in the transmitter procedure Setting the Impulse Noise Measurement Period 8 Use the PERIOD key to select a timed measurement 5 15 or 60 minutes or nonstop Setting the Impulse Noise Threshold 9 Use the Impulse Noise DISPLAY key to select LOW SET The current threshold value will appear in the left window the THRESH and dBrn indicators will be lit 10 Use the lt STEP UP and STEP DOWN keys keys to set the threshold value If a holding tone exists on the line To maintain measurement accuracy the impulse low threshold should be no more than 25 dB below the holding tone l
54. he serial port on the controller For 4934A pinout information see 4934A TIMS Serial Port Pinout page 7 2 For cable information see Cable Pinout page 7 3 Setting the Baud Rate To change the 4934A serial port baud rate for remote control operation first put the unit into LEVEL FREQ mode Next press STORE followed by P AR N T GND to cycle through the baud rate choices The display shows bd in the left display and the current baud rate in the right display The baud rates available are 300 1200 2400 9600 and 19200 The 4934A always resets to 9600 baud at power up The 4934A uses 8 data bits no parity 1 stop bit and hardware flow control Activating Remote Mode The 4934A enters remote control mode when it detects the RMT command at the serial input While the unit is in remote mode the front panel controls are locked out pressing any key displays a not local message Deactivating Remote Mode The 4934A exits remote mode when it detects the LCL command at the serial port The unit returns to normal operation You can also deactivate remote operation by switching the unit off and then back on again 7 4 Remote Control Control Commands Control commands change the 4934A s operation Control commands emulate a front panel key sending a command is comparable to pressing the corresponding key Another set of commands query commands retrieve results from the unit see Query Commands page 7 8 When the 4934
55. igh or unstable see the error codes in Chapter 1 Making Measurements 2 9 Message Circuit Noise Principles The measurement uses no test signal and quantifies background noise with a choice of band limiting filters C Message 3 kHz Flat 15 kHz Flat Program and 50 kBit C Message This filter weights noise in the same way it would be heard by a telephone user However it is also used to evaluate the effects of noise on voice grade data circuits because its response is relatively flat over the fre quency range for data transmission 3 kHz Flat This filter attenuates much less at low frequencies 60 Hz to 500 Hz than the C Message filter By performing a 3 kHz measurement after a C Message measurement the effect of low frequency noise 60 Hz commer cial power 20 Hz ringing etc can be determined RESPONSE OF C MESSAGE FILTER RESPONSE OF 3KHz FLAT FILTER i i T a E 5 jhe E al 500 4000 2000 3000 5099 Hera oo 20G 5 FREQUENCY iHz FREQUENCY Hz 15 kHz Flat This filter is used when measuring noise on program channels used in the broadcasting industry Like the 3 kHz Flat filter it passes low fre quency noise Program This filter is used when measuring noise on program channels used in the broadcasting industry to communicate between the studio and transmitter site 50 kBit This is a weighted filter used to measure noise on wideband data circuits 2 10 Making Measurements
56. ins change information that explains how to adapt the manual to the new instrument In addition to change information the supplement may contain information for correcting errors in the manual To keep this manual as current and accu rate as possible Hewlett Packard recommends that you periodically request the latest Manual Changes supplement The supplement for this manual is identified with the manual print date and part number both of which appear on the manual title page Complementary copies of the supplement are avail able from Hewlett Packard For information concerning a serial number pre fix that is not listed on the manual title page or in the Manual Changes supplement contact your nearest Hewlett Packard office General Information 3 7 Options Available The following options are available and may have been ordered with the HP 4934A Option 001 Rechargeable Ni Cd battery and charger Option 010 Delete Test Cords two HP 15513A Im WECO 310 to WECO 310 cables Option 021 Extends frequency range to 200 kHz Option 910 Provides an additional copy of the Operating and Calibration Manual an two copies of the Service Manual Option 915 Used for ordering a copy of the Service Manual to enable a service trained person to troubleshoot and repair the instrument Option W30 3 year Extended Support W30 is an extended hardware support agreement It provides 2 year extended hardware support beyond the standard 1 year re
57. inutes 7 8 Remote Control NOTE Range Error Messages The LEV FREQ and THRESH commands accept a range of valid values If an out of range value is entered the 4934A still returns OK to the controller However the ERR can check for the most recent out of range command value The ERR command identifies only the most recent out of range value entered The ERR returns one of the following responses ERR Responses Response No Errors Level over range Level under range Frequency over range Frequency under range Threshold over range Threshold under range Description No range errors were detected since the last ERR command The last LEV value was too high The last LEV value was too low The last FREQ value was too high The last FREQ value was too low The last THRESH value was too high The last THRESH value was too low Remote Control 7 9 7 10 Remote Control Service Accessory 1 SA1 20 dB Ampilifier 4 kHz Filter Performance Test SPECIFICATION Unity Gain with Flat Filter 0dB 1 5 dB from 20 Hz to 85 kHz 20 dB Gain with Flat Filter 20 dB 1 5 dB from 20 Hz to 85 kHz 4 kHz Filter Rejection at 10 kHz is greater than 10 dB EQUIPMENT AC Calibrator DATRON 4707A AC Voltmeter HP 3456A Dual Output DC Power Supply HP 6234A PROCEDURE CAUTION Ensure that the AC Calibrator OUTPUT is switched off or set to the minimum level before proceeding with the f
58. ion 4 1 Preparation for Use 4 2 Power Requirements 4 2 Line Fuse 4 2 Power Cable 4 3 Battery Option 001 or Retrofit 4 3 Battery 4 3 Mating Connectors Front Panel 4 4 Operating Environment 4 4 Cleaning 4 4 Noise Declaration 4 5 Storage and Shipment 4 5 Environment 4 5 Packaging 4 5 Performance Tests Introduction 5 1 Calibration Cycle 5 1 Recommended Test Equipment 5 2 Operational Verification 5 3 Receiver Frequency 5 4 Receiver Level 5 5 Weighting Filters 5 6 Impulse Noise Count 5 9 Loss of Holding Tone 5 10 Hold Circuit 5 11 Dynamic Hold Circuit 5 13 Performance Tests 5 18 Contents Transmitter Frequency Accuracy 5 19 Transmitter Level Range 5 20 Transmitter Level Accuracy 5 21 Transmitter Flatness at 10 dBm 5 22 Transmitter Flatness at 40 dBm 5 24 Receiver Frequency Range Accuracy 5 30 Receiver Level Accuracy 5 32 Message Circuit Noise Accuracy 5 34 Notch Filter Rejection 5 36 Signal to Noise Ratio Accuracy 5 37 Impulse Noise Threshold Accuracy 5 39 Noise to Ground Accuracy 5 41 Peak to Average Ratio P AR Accuracy 5 43 Software Downloading Introduction 6 1 Quick Download Procedure 6 2 About the DOWNLOAD Program 6 3 Remote Control Introduction 7 1 The Serial Port 7 2 Serial Port Type 7 2 Baud Rates 7 2 Cable Pinout 7 3 Null Modem 7 3 Setting up for Remote Control 7 4 Connecting the TIMS to a Controller 7 4 vi Contents Setting the Baud Rate 7 4 Activating Remote Mode 7 4 Deactiv
59. is selectable the medium and high thresholds are fixed at 4 dB and 8 dB above the low thresh old The waveform b below illustrates a received holding tone or test tone that includes interfering impulse noise spikes amp a TRANSMITTED HOLDING TONE AMPLITUDE b RECEIVED HOLDING TONE WITH IMPULSE NOISE SPIKES Making Measurements 2 17 Ciearteay TERARGING 5 STBY CJ LB TRMT mf O0 C0 The HP 4934A measures impulse noise with or without a holding tone The HP 4934A transmits a holding tone and uses the notch filter in the receiver when either the C Message or 3 kHz Flat Filter is selected With the 15 kHz Flat Program or 50 kBit Filter selected the transmitter is quiet terminated and the receiver notch filter is not selected Instrument Operation FILTER HER FER PULSE HOSE osm o pisen gmo Mle mse TEOSE 3H NOISE ie ic FLAT oy TOME a5 kHz plese Brat NOISE Deom EIHKE et eeuse TIPRGM ame a TITMER j Eige SE aoe reverse 350 kBIT pora EE n Es ae poh gt ee PERIOD Sart 9 11 13 1 RUY CINT GND i 42 REV AN J TRET co 7 13 HEWLETT PACKARD n HMS y 4 3 6 1 2 5 7 1 Use MEAS to select IMPULSE NOISE TRANSMITTER To measure Impulse Noise with a holding tone go to step 2 To measure Impulse Noise without a holding tone go to step 5 Impulse Noise with a Holdin
60. istor HP 0757 0178 WECO 310 Connector HP 1252 0695 PROCEDURE 1 Connect the equipment as shown in the following figure DC POWER SUPPLY 2 Set the HP 4934A as follows Measurement Transmitter TRMT Impedance Receiver RCV Impedance Transmit Hold Select Receive Hold Select LEVEL FREQ 6002 600Q TRMT HOLD RCV HOLD Performance Tests 5 11 Transmitter Hold Circuit 7 8 9 Connect the DC Voltmeter across points A and B shown in the previous figure Adjust the DC Power Supply output level until a 48 V reading is obtained on the DC Voltmeter Connect the DC Voltmeter across points C and D shown in the previous figure and note the reading Calculate the hold current as follows Hold Current Voltage noted in step 5 100 The specification of the hold current is nominally 26 mA Switch off the DC Power Supply Reverse the polarity of the connections to the DC Power Supply Switch on the DC Power Supply 10 Repeat steps 5 to 7 Receiver Hold Circuit 11 Press REVERSE 12 Repeat steps 5 to 10 5 12 Performance Tests Dynamic Hold Circuit EQUIPMENT Function Generator HP 3325A 509 output impedance DC offset capability PROCEDURE 1 Connect the Function Generator output to the HP 4934A RCV port 2 Set the HP 4934A as follows Measurement LEVEL FREQ Receiver RCV Impedance 60092 Bridge BRDG Select BRDG ON 3 Set the Function Gen
61. king 200 V nominal 3 14 General Information Impedances Nominally 135 150 600 900 and 1200 ohm Transmit and receive impedances are independently selectable Receiver Return Loss 600 900 and 1200 ohm 50 Hz to 4kHz Typically gt 30 dB Bridging Loss up to 20 kHz Typically lt 0 2 dB Longitudinal Balance typical gt 80 dB at 60 Hz gt 70 dB at 540 Hz gt 60 dB up to 4 kHz decreasing at 6 dB per octave up to 20 kHz Hold Circuits Two each drawing 23 mA nominal AC Power Requirement Selectable between 90 to 126Vac RMS 48 to 66 Hz and 198 to 264 Vac RMS 48 to 66 Hz 20 VA maximum Battery Supply option 001 Nominally 6 hours 4 hours minimum operation at 25 C Complete recharge typically in 14 hours with unit in standby mode RS 232 port DB 9S connector DTE baud rates 300 1200 2400 9600 19200 38400 8 bits no parity 1 stop bit hardware flow control Temperature range without batteries Operating 0 to 50 C Storage 40 to 75 C Temperature Range with batteries Operating 0 to 40 C Storage 20 to 55 C Size W H D including handle 28 0 10 5 35 5 cm 11 0 4 1 14 0 inches Weight without batteries 3 7 kg 8 2 Ib Weight with batteries 5 0 kg 11 0 Ib General Information 3 15 3 16 General Information WARNING Installation Introduction This section provides installation instructions for the Hewlett Packard Model 4934A Tra
62. lowing demonstrations show how easy the HP 4934A is to use A detailed explanation of the HP 4934A measurement capability is given in Chapter 2 The HP 4934A TRMT and RCV ports are connected by a looping cable in these demonstrations Demonstration 1 A single tone measurement with the transmitter set to 10 dBm and the fre quency set to 1804 Hz ERS FILTER PURSE NOSE a joc MSG ETSMIN Das pame Cheap NOISE i W TONE ai B A LON ENSET Eionn EIMGH a NON E g m st Clpasn crop CA TIMER A amp bal E fon E 5 Se E i a i fispa AY sr se SKIP EA EN i PERIOG ra 5 pore FA NIGI H STORE F3 2604 E 3C El HEWLETT Ww PACKARD ian 1 Use MEAS to select LEVEL FREQ TRANSMITTER 2 Use the TRMT key to set the transmitter impedance to 600Q 3 Display the transmitted level and frequency using the DISPLAY key TRMT indicator lit 4 Use the OUTPUT LEVEL control to adjust the transmitted level to 10 dBm Change the transmitted frequency to 1804 Hz using the gt lt STEP UP and STEP DOWN keys Getting Started 1 5 RECEIVER Use the RCV key to set the receiver impedance to 600Q 7 Display the received level and frequency using the DISPLAY key RCV indicator lit Demonstration 2 A noise with tone measurement with the holding tone set to 13 dBm and the C Message filter selected coer Conver tent STEP P Corey ea x WE Fiaa
63. lt is in units of dBrncC 2 12 Making Measurements Noise with Tone Notched Noise Principles This measurement quantifies total noise which includes background noise and noise generated only when a signal is present such as when the circuit includes compandors and or quantizers RECEIVER a MONTOR o E How it is Measured 1 The transmitter sends a 1004 Hz holding tone at the nominal data level 2 The receiver notches out the 1004 Hz holding tone and what is left is measured via a weighting filter C Message 3 kHz Flat 15 kHz Flat Program or 50 kBit The measured noise level is displayed in dBrn 0 dBrn 90 dBm When the C Message filter is used the result is in units of dBrnC The notch attenuates all frequencies in the range 995 Hz to 1025 Hz by at least 50 dB FREQUENCY RESPONSE C MESSAGE FILTER WITH 1004Hz NOTCH 1c FREQUENCY Hz Making Measurements 2 13 Instrument Operation aaaeaii O TRF HPL rrr REET he fese iG i Poua at REY i iJ a RLY ae Gsi ATTERT SO pl EA OO omn TIS Oam Jda MMN Edam THRESH T Okke pe a en fe Ton Aa ee ese ii ese T Sat R leo 56 HEAS I Ha CICNTNG T IROISE NOISE Thy Tone Sig T0 Conse Eg pM PULSE oE DA fea EA E E3 AE NTGND MONITOR OLUNE 1 Use MEAS to select NOISE W TONE TRANSMITTER 3 Temse 3 Gaar iS kk Ellar EPRGM CUSGk
64. mpulse Noise threshold set too high adjust Loss of holding tone during pulse Noise measurement only a warning the instrument continues counting Getting Started 1 7 1 8 Getting Started Making Measurements Preliminary Setup Connecting the HP 4934A to the Test Circuit yore sist AAALAC H IEJSOMN CHSGH Nerney LITRA IMPULSE in Giap Ci tiie NOISE Fao F200 PERIOD esr PIAR 3 HOLDI ITRME REY lang GND BATTERY PA I Tg a 3 2804 EER l J f START 3 G BS D oe O 6 MEAS i RESET j Stor ST HEWLETT 493464 AN COD i BaCZARD Rite CAUTION Ensure no more than 200 V de or 10 V rms at 60 Hz is connected between tip and ring of the TRMT or RCV jacks 1 The two 310 type jacks of the HP 4934A can function as a Transmitter output or Receiver input Pressing the REVERSE key causes the function of the two 310 type jacks to be reversed The current function of the ports is indicated by the indicators below the REVERSE key If the line to be tested is already terminated press BRDG Select the receiver input impedance using the RCV key 135 150 600 900 or 120002 When operating in BRDG bridged mode still ensure the correct impedance is selected Making Measurements 2 1 4 Select the transmitter output impedance using the TRMT key 135 150 600 900 or 12002 Dial and Hold The HP 4934A can be used with a butt in to dial u
65. n dm NeoN EIPRGM i ma 350 xT K PETR PERIOD Jii 1 Use MEAS to select LEVEL FREQ TRANSMITTER 2 Display the transmitted level and frequency using the DISPLAY key the TRMT indicator will be lit A frequency of 1004 Hz is initially transmitted each time LEVEL FREQ is selected 3 Change the transmitted level if desired using the OUTPUT LEVEL control the level in dBm is in the left window NOTE In some systems it is not desirable to transmit levels above 13 dBm0 as interference with other channels may occur Decide whether you want to use a preset frequency or some other frequency Preset Frequency In the LEVEL FREQ mode the blue keys give single keystroke access to four preset frequencies The normal preset frequencies are 404 Hz 1004 Hz 2804 Hz and 2713 Hz 4 To select a preset frequency press the appropriate blue key Making Measurements 2 7 NOTE NOTE Key Normal Frequency 404 Hz 1004 Hz 2804Hz 2713 Hz 5 To store a different preset frequency Set the new frequency in the right window using the gt lt STEP UP and STEP DOWN keys Enter the new frequency into one of the stores by pressing the blue STORE key followed by the appropriate blue F1 to F4 key The normal frequency values are re established when the power is cycled or when the measurement mode is switched between P AR and N T GND Some Other Frequency 6 Change the valu
66. ng Call With a Butt in 2 4 Without a Butt In 2 4 Reversing the two 310 Port Connections 2 1 S Safety symbols 3 3 Signal to Noise Accuracy Performance Test 5 37 instrument Operation 2 16 Principles 2 15 Single Frequency SF Signaling 2 8 Single Point Frequencies 2 8 T Transmitter Flatness at 10 dBm Performance Test 5 22 Frequency Accuracy Performance Test 5 19 Level Accuracy Performance Test 5 21 Level Range Performance Test 5 20 Transmitter TRMT Impedance 2 2
67. nnect the HP 4934A receiver to it select RCV HOLD then REVERSE You can now receive test signals from the line To re establish the speech path press REVERSE and DIAL To drop the line press RCV HOLD Making Measurements 2 3 Receiving an Incoming Call and Holding the Line Maim Cee EIM Cam COTHRESH ENTS Cte jez da IENTNS fa i A RE FREI DONOSE iste DRAT Ea gt IPREM OF FA FA e _e YOLUNE YER GE Emme CFE CPTO 50 xBit i i a ei i RPULSE Snowe i PAAR EE NT O O ENET ONA W J PACKARD E Without a Butt In 1 Connect the RCV port to the test line Use the DISPLAY key to light the RCV indicator Adjust the volume of the audio monitor so that you can hear any received signal using the MONITOR VOLUME control When a call comes in you will hear a buzzing on the audio monitor To seize the line press RCV HOLD The caller can now speak to you or transmit test signals To make measurements use MEAS to select the appropriate measurement To transmit test signals while continuing to hold the line press TRMT HOLD then REVERSE To drop the line press the appropriate HOLD key With a Butt In if you want to talk Connect the TRMT port to the test line Connect the butt in to the T and R DIAL binding posts and press DIAL to connect the butt in through to the TRMT port The DIAL indicator will light When
68. noise readings AC Calibrator Frequency HP 4934A Noise Reading 400 Hz 88 to 92 dBrn 1 000 Hz 89 to 91 dBrn 3 000 Hz 84 to 90 dBrn 6 000 Hz 74 to 82 dBrn 15 kHz Flat Filter 7 Select the 15 kHz FLAT filter 8 Set the AC Calibrator to each of the frequencies in the following table and check HP 4934A Noise Reading the HP 4934A noise readings AC Calibrator Frequency 400 Hz 1 000 Hz 15 000 Hz 30 000 Hz 88 to 92 dBrn 89 to 91 dBrn 84 to 90 dBrn 74 to 82 dBrn Program Filter 9 Select the PRGM filter 10 Set the AC Calibrator to each of the frequencies in the following table and check the HP 4934A noise readings 100 Hz 500 Hz 61 to 67 dBrn 81 to 85 dBrn 1 000 Hz 88 to 92 dBrn 2 000 Hz 92 to 98 dBrn 7 000 Hz 92 to 100 dBrn 10 000 Hz 76 to 86 dBrn Performance Tests AC Calibrator Frequency HP 4934A Noise Reading 50 kBit Filter 11 Select the 50 kBit filter 12 Set the AC Calibrator to each of the frequencies in the following table and check the HP 4934A noise readings AC Calibrator Frequency HP 4934A Noise Reading 50 Hz 85 to 90 dBm 1 000 Hz 89 to 91 dBrn 15 000 Hz 87 to 91 dBrn 25 000 Hz 86 to 90 dBrn 50 000 Hz lt 69 dBrn 5 8 Performance Tests CAUTION Impulse Noise Count Ensure that the AC Calibrator OUTPUT is switched off or set to the minimum level before proceeding with the following procedure 1 Connect the
69. nsmission Impairment Measuring Set and its accessories This section also includes information about initial inspection preparation for use packaging storage and shipment initiai Inspection To avoid hazardous electrical shock do not perform electrical tests when there are signs of shipping damage to any portion of the outer enclosure covers panels meters and so on Inspect the shipping container for damage If the shipping container or cush ioning material is damaged it should be kept until the contents of the ship ment have been checked for completeness and the instrument has been checked mechanically and electrically Procedures for checking electrical performance are given in Chapter 5 of this manual If the contents are incomplete if there is mechanical damage or defect or if the HP 4934A does not pass the Performance Tests notify the nearest Hewlett Packard office If the shipping container is damaged or the cushioning material shows signs of stress notify the carrier as well as the Hewlett Packard office Keep the ship ping materials for the carrier s inspection The HP office will arrange for repair or replacement at HP option without waiting for claim settlement Installation 4 1 WARNING WARNING WARNING If this instrument is not used as specified the protection provided by the equipment could be impaired This instrument must be used in a normal condition only in which all means for protection are intact
70. nt by model number and full serial number 4 6 Installation Performance Tests Introduction This chapter contains procedures which tests the HP 4934A electrical per formance to the specifications in Chapter 3 There are two levels of performance testing contained in this chapter Operational Verification Provides gt 90 confidence that the instrument is operating to its full warranted specification Full Performance Test Ensures that the instrument is operating to its full warranted specification Results of the Performance Test may be recorded on the Test Record at the end of Chapter 5 or on the Abbreviated Test Record at the end of the Opera tional Verification procedures Calibration Cycle Results recorded on the Test Record at incoming inspection can be used for comparison in yearly maintenance and calibration or after repairs or adjust ments Performance Tests 5 1 Recommended Test Equipment The test equipment required is listed in the following table Equipment which meets or exceeds the critical specifications may be substituted for the recommended model Recommended Test Equipment Critical Specification Recommended Model AC Calibrator Frequency range 20 Hz to DATRON 4707A 110 kHz Voltage range1 5 mV to 80 V Synthesizer HP 3336B Balanced 600Q output DMM 6 1 2 digit resolution HP 3456A DC Power Supply Dual output range 0 to 48 V HP 6234A Freq
71. o the troubleshooting section in Chapter 8 of the Service Manual or return the instrument to the nearest HP Service Office 5 18 Performance Tests Transmitter Frequency Accuracy SPECIFICATION Frequency Range 20 Hz to 110 kHz Frequency Accuracy 20 Hz to 99 999 kHz 0 005 100 kHz to 110 kHz 0 012 DESCRIPTION A Frequency Counter is used to check the accuracy and range of the HP 4934A transmitter EQUIPMENT Frequency Counter HP 5315A PROCEDURE 1 Setthe HP 4934A as follows Measurement LEVEL FREQ Transmitter TRMT Impedance 600Q Display Mode TRMT Transmitter Output Level Frequency 0 dBm 20 Hz Connect the HP 4934A TRMT port to the Frequency Counter input Check the reading on the Frequency Counter is between 19 999 and 20 001 Hz Set the HP 4934A transmitter frequency to each of the values in the following table and check the Frequency Counter reading Transmitter Frequency Frequency Counter Reading 1000 Hz 999 95 to 1000 05 Hz 10 000 Hz 9 999 5 to 10000 5 Hz 50 000 Hz 49 997 5 to 50002 5 Hz 99 999 Hz 99 994 to 100 004 Hz 110 000 Hz 109 986 8 to 110 013 2 Hz Performance Tests 5 19 Transmitter Level Range SPECIFICATION Level Range 40 dBm to 13 dBm DESCRIPTION An AC Voltmeter and a 600Q resistor are used to check the level range of the HP 4934A transmitter EQUIPMENT AC Voltmeter HP 3456A 60092 0 01 Resistor HP 0811 3502 PROCEDURE 1 Connect the 6009 resis
72. ocation Serial No Tested by Temperature Certified by Humidity Date Table 2 Performance Test Record Transmitter Frequency Accuracy 5 19 Step 3 20 Hz 19 999 Hz Step 4 1000 Hz 999 95 Hz 10 000 Hz 9 999 5 Hz 50 000 Hz 49 997 5 Hz 100 000 Hz 99 994 Hz 110 000 Hz 109 986 8 Hz Transmitter Level Range 5 20 Step 4 Fully clockwise Step 5 Fully anti clockwise Transmitter Level Accuracy 5 21 Step 4 0 dBm 0 7657 V Step 5 5 dBm 0 4306 V 10 dBm 0 2421 V 19 dBm 0 0859 V Actual Max 20 001 Hz 1000 05 Hz 10 000 5 Hz 50 002 5 Hz 100 004 Hz 110 013 2 Hz 0 00775V 0 7836 V 0 4406 V 0 2478 V 0 0879 V 5 44 Performance Tests Tabie 2 Test Description 5 22 5 24 5 30 5 32 Performance Test Record Transmitter Flatness at 10 dBm Step 5 20 Hz 200 Hz 5 000 Hz 15 000 Hz 30 000 Hz 85 000 Hz Transmitter Flatness at 40 dBm 20 Hz to 200 Hz 41 0 dB 200 Hz to 15 kHz 0 2 dB 15 kHz to 85 kHz 0 5 dB Receiver Frequency Range and Accuracy Step 4 20 Hz Step 5 1000 Hz 10 000 Hz 50 000 Hz 100 000 Hz 110 000 Hz Receiver Level Accuracy Step 4 1000 Hz Step 6 Step 8 20 Hz Min 2 1831 V 2 3937 V 2 3937 V 2 3937 V 2 3125 V 2 3125 V 19 Hz 999 Hz 9 995 Hz 49 99 kHz 99 99 kHz 109 99 kHz 9 9 dBm 20 1 dBm 10 dBm Result Actual Performance Tests Max 2 7484 V 2 5065 V 2 5065 V 2 5065 V 2 5946 V 2 5946 V 21 Hz 1001 Hz 10 005 Hz 50
73. ollowing procedure 1 Connect the equipment as shown in the following figure AC CALIBRATOR SA Al VOLTMETER re aren ae ahi pen Service Accessory 1 SA1 A 1 20 dB Amplifier 4 kHz Filter Unity Gain and Flatness Check 2 Set SAI as follows Gain Unity Filter Flat 3 Set the AC Calibrator output level to 0 7746 V at 20 Hz then switch on the OUTPUT Check that the AC Voltmeter is between 0 6517 V and 0 9206 V Set the AC Calibrator to each frequency listed in the following table and check the corresponding AC Voltmeter reading AC Calibrator Frequency AC Voltmeter Reading 50 Hz 0 6517 V to 0 9206 V 200 Hz 0 6517 V to 0 9206 V 1000 Hz 0 6517 V to 0 9206 V 15 kHz 0 6517 V to 0 9206 V 60 kHz 0 6517 V to 0 9206 V 85 kHz 0 6517 V to 0 9206 V 20 dB Gain and Flatness Check 6 Set SA1 as follows Gain 20 dB Filter Flat Set the AC Calibrator output level to 7 746 mV at 20 Hz Check that the AC Voltmeter reading is between 65 17 mV and 92 06 mV Set the AC Calibrator to each frequency listed in the following table and check the corresponding AC Voltmeter reading A 2 Service Accessory 1 SA1 20 dB Ampilifier 4 kHz Filter AC Calibrator Frequency AC Voltmeter Reading 50 Hz 65 17 mV to 92 06 mV 200 Hz 65 17 mV to 92 06 mV 1000 Hz 65 17 mV to 92 06 mV 15 kHz 65 17 mV to 92 06 mV 60 kHz 65 17 mV to 92 06 mV 85 kHz 65 17 mV to 92 06 mV 4 kHz Filter Check 10 Set SA1 as follows
74. p lines or for talking along a line The HP 4934A can hold lines which require a DC current to maintain the connection once the butt in is disconnected The diagram below shows how the hold dial and reverse functions work 2 2 Making Measurements Dialing using the HP 4934A and a Butt in rrr ALAA eee ee RT j y FEER Y PRSE NOSE Elde as IMN Chase CITHRESE CICNTS Cz CH Mes CACHING GE ens iega lek ae ice SEN i Cinoist 3 Kz erat ENSIN Cee i gose ae 5I TONE z T PTA 16 TO eat EFECOM a i ye SE CITRMT Fa P gima pgrPutse OPPN GI OTER A E NOISE MAE LEETE 21004 ES J A gt sagn Een sser ski EA P f ES KA NEGND 8 tla naa ana TRY HONNSA E3 oUF Mv ETBATTERY REY Te SLUHE LEVEL cas ee ORE Clezareine b es 6 O nes GO34A i TNS 2 1 1 Connect the butt in to the T and R DIAL binding posts Connect the test circuit to the TRMT port Select DIAL to connect the butt in through to the TRMT port The DIAL indicator will light Dial up the line you want using the butt in When the far end goes off hook you can use the butt in for voice communication To continue to hold the line and connect the HP 4934A transmitter to it select TRMT HOLD then DIAL You can now transmit test signals along the line To re establish the speech path press DIAL To drop the line press TRMT HOLD 7 Alternatively to continue to hold the line and co
75. plemental characteristics that provide a useful indication of typical but non warranted performance Test methods meet IEEE standards 743 1984 Transmitter Frequency Range Resolution Accuracy 20 to 99999 Hz 1 Hz 50 ppm 100 to 110 kHz 10 Hz 120 ppm t Wideband option expands range to 200 kHz Additional Transmitter Functions SF Skip Transmitter skips 2600 150 Hz Four Preset Frequencies Normally 404 1004 2804 and 2713 Hz e User can temporarily change these and the SF Skip center fre quency Receiver Frequency Range Resolution Accuracy 20 to 9999 Hz 1 Hz 1 Hz 10 to 110 kHz F 10 Hz 10 Hz t Wideband option expands range to 200 kHz 3 10 General Information Transmitter Level Range 40 to 13 dBm Resolution 0 1 dB Accuracy at 1004 Hz 0 to 19 dBm Typically 0 1 dB Flatness dB relative to 1004 Hz Frequency Hz Level dBm 20 200 200 15k 15k 60k 10 to 13 1 2 5 0 3 0 5 40 to 10 15 0 3 0 5 t Wideband option expands range to 200 kHz Distortion dB down from fundamental typical Frequency Hz Level dBm 30 100 100 4k 10 to 13 20 45 0 to 10 20 50 30 to 0 40 45 40 to 30 40 43 t Wideband option expands range to 200 kHz 60k 85k 85k 110k t 07 2 0 0 6 2 0 4k 110kT 45 45 40 33 At 1004 Hz 0 dBm THD typically gt 65 dB down from fundamental General information 3 11 Receiver Level Range 60 to
76. r Performance Tests 5 37 PROCEDURE 1 Connect the equipment as shown in the following figure SYNTHESIZER 2 Set the HP 4934A as follows Measurement SIG TO NOISE Filter 15 kHz FLAT Transmitter TRMT Impedance 600Q Receiver RCV Impedance 600Q Display Mode TRMT Transmitter Level 10 dBm Set the Synthesizer output level to 0 dBm at 1800 Hz Set the HP 4934A Display Mode to RCV then check the signal to noise ratio reading on the display is 10 dB 1 dB 5 Set the Synthesizer output level to each of the values in the following table and check the noise reading on the HP 4934A Synthesizer Level HP 4934A Noise Reading 10 dBm 20 dB i dB 30 dB 1 dB 40 dB 1 dB 45 dBi2 dB 5 38 Performance Tests CAUTION Impulse Noise Threshold Accuracy SPECIFICATION RECEIVER Level Range 40 to 10 dBm Range Low Threshold 30 to 109 dBrn Mid Threshold 34 to 109 dBrn High Threshold 38 to 109 dBrn Threshold Accuracy gt 40 dBm 3 dB gt 50 dBm idB DESCRIPTION An AC Calibrator is used to verify the Low Mid and High impulse noise thresholds EQUIPMENT AC Calibrator DATRON 4707A Ensure that the AC Calibrator OUTPUT is switched off or set to the minimum level before proceeding with the following procedure PROCEDURE 1 Connect the AC Calibrator output to the HP 4934A RCV input 2 Set the AC Calibrator output level to 1 732 mV at 1000 Hz then switch on
77. s between 10 and 12 dBm oOo oOo N OO Set the AC Calibrator to each of the frequencies in the following table and check the HP 4934A receiver level readings AC Calibrator Frequency HP 4934A Receiver Level 50 Hz 10 5 to 11 5 dBm 200 Hz 10 8 to 11 2 dBm 15 000 Hz 10 8 to 11 2 dBm 85 000 Hz 10 5 to 11 5 dBm 10 Set the AC Calibrator output level to 7 746 mV at 20 Hz 11 Check the HP 4934A receiver level reading is between 41 and 39 dBm 12 Set the AC Calibrator to each of the frequencies in the following table and check the HP 4934A receiver level readings AC Calibrator Frequency HP 4934A Receiver Level 50 Hz 40 5 to 39 5 dBm 200 Hz 40 2 to 39 8 dBm 15 000 Hz 40 2 to 39 8 dBm 85 000 Hz 40 5 to 39 5 dBm Performance Tests 5 33 CAUTION Message Circuit Noise Accuracy SPECIFICATION TRANSMITTER Quiet Terminated RECEIVER Filters C Message 3 kHz Flat 15 kHz Flat Program and 50 kBit Range 600 900 and1200Q 0to 100 dBrn 135 and 150Q 7 to 100 dBrn Accuracy 10 dBrn to 100 dBm 1 dBm 0 dBrn to 10 dBrn 3 dBrn DESCRIPTION The Message Circuit Noise accuracy is checked using an AC Calibrator and Decade Transformer The Decade Transformer attenuates a test signal from the AC Calibrator EQUIPMENT AC Calibrator DATRON 4707A Decade Transformer Model DT72A DEKATRAN PROCEDURE Ensure that the AC Calibrator OUTPUT is switched off or set to the minimum level before proceeding with
78. sconnect the AC Calibrator from the input of SA1 Connect the HP 4934A TRMT port to the input of SAI Adjust the HP 4934A transmitter output level until the reading on the AC Voltmeter is the same as that noted in step 5 NOTE Do not change the HP 4934A transmitter output level or the AC Calibrator output level during the remainder of this procedure Performance Tests 5 25 10 Adjust the HP 4934A transmitter frequency to each of the values in the table on Pages 5 27 to 5 29 Note the reading on the AC Voltmeter at each frequency 11 Reconnect the AC Calibrator to SA1 12 Adjust the AC Calibrator frequency to each of the values in the table on Pages 5 27 to 5 29 Note the reading on the AC Voltmeter at each frequency 13 Use the AC Voltmeter readings and the table on Pages 5 27 to 5 29 to check the flatness This is best explained by the following example If the frequency is 20 Hz and the AC Voltmeter reading in step 12 were 71 0 mV Look up 71 mV in the V ut column then check the 20 Hz column for the allowable voltage range when the HP 4934A is connected to the AC Voltmeter If the reading in step 10 is within the 79 7 to 63 3 mV range the 20 Hz check would be good 5 26 Performance Tests 1dB 0 2 dB 0 5 dB Vout in mV at 20 Hz and 50 Hz at 200 Hz and 15 kHz at 60 kHz and 85 kHz 65 0 72 9 to 57 9 66 5 to 63 5 68 9 to 61 4 73 4 to 58 3 66 9 to 63 9 69
79. sible that the safety protection features built into this product have been impaired either through 3 2 General Information physical damage excessive moisture or any other reason REMOVE POWER and do not use the product until safe operation can be verified by service trained personnel If necessary return the product to a Hewlett Packard Sales and Service Office for service andrepairto ensure the safety features are maintained DO NOT substitute parts or modify equipment Because of the danger of introducing additional hazards do not install substitute parts or perform any unauthorized modification to the product Return the product to a Hewlett Packard Sales and Service Office for service and repair to ensure the safety features are maintained Safety Symbols The following symbols on the instrument and in the manual indicate precautions which must be taken to maintain safe operation of the instrument Safety Symbols The Instruction Documentation Symbol The product is marked with this symbol when it is necessary for the user to refer to the instructions in the supplied documentation Indicates the field wiring terminal that must be connected to earth ground before operating the equipment protects against electrical shock in case of fault Frame or chassis ground terminal typically connects to the equipment s metal frame Alternating current AC Direct current DC Indicates hazardous voltages G
80. strument is equipped with a three wire power cable When connected to a properly grounded power outlet this cable grounds the instrument case Battery Option 001 or Retrofit amp XK CONTAINS NICKEL CADMIUM BATTERY MUST BE RECYCLED OR DISPOSED OF PROPERLY Consult your local HP office for details Only replace with batteries of the same type and rating Rechargeable nickel cadmium 6 cell 4Ah batteries Do not short circuit the battery terminals it may cause serious personal injury The battery should only be changed by service trained personnel Do not incinerate or otherwise mutilate the battery It might burst or release toxic materials causing personal injury For operator protection during battery operation connect the chassis terminal on the side panel to earth ground The instrument will run with a fully charged battery for nominally 6 hours at 25 degrees centigrade Full charge is ensured by charging for 14 hours at 25 degrees centigrade The battery is not Operator replaceable refer to to ser vice trained personnel or return to the nearest HP Service Centre Installation 4 3 CAUTION Mating Connectors Front Panel The TRMT and RCV front panel jacks are 310 type connectors The mating plug for the jacks is part number HP 1251 0695 Operating Environment This instrument is designed for indoor use only Temperature The instrument may be operated in temperatures from 0 degrees centigrade to
81. t Pinout Pin Number Functions 1 No connection 2 XD Transmit data output The serial port uses the following communication 3 RXD Receive data input parameters 8 data bits A DSR Data set ready input No parity 5 GND Ground of stop bit 6 DTR Data terminal ready output e Hardware flow control 7 CTS Clear to send input 8 RTS Request to send output 9 No connection Baud Rates The serial port supports the following baud rates 300 1200 2400 9600 19200 and 38400 Note that 38400 baud is only available for software downloading The 4934A always defaults to 9600 baud at power up To change the baud rate for remote control see Setting the Baud Rate page 7 4 To change the baud rate for software downloading see Quick Download Procedure page 6 2 7 2 Remote Control Cable Pinout The following table shows the pinouts for a straight through 9 pin cable Straight Through Cabie PC End Pins 4934A End Pins 1 a Null Modem The following table shows the pinouts for a null modem cable This is the cable to be used when a Vectra is being used as the controller Nuil Modem Cable Cable Pins Cable Pins i ee 2 2 3 3 4 4 5 5 i 6 6 7 7 8 8 Qian acl Remote Control 7 3 NOTE Setting up for Remote Control Connecting the TIMS to a Controller _ To connect the 4934A to a controller use an appropriate serial cable from the unit s serial port on the right side to t
82. this manual opposite the instrument description About this Version Applicability This version of the 4934A TIMS Operating amp Calibration Manual applies to HP 4934A standard unit or with options 021 or 022 installed running software version 1 2 These TIMS units are easily identified by the presence of a 9 pin RS 232 serial port on the right side above the AC connector Some functions of older 4934As or units running earlier versions of the software may operate differently some functions of test sets running later software versions may not be covered by this supplement Be sure to refer to any additional user manual supplements or release notes that came with your 4934A TIMS or call CERJAC Telecom Operation at 1 800 9 CERJAC or 1 508 266 3300 Check the Software Version You can check the version number of the operating software in your 4934A by observing the right display during the start up routine The software version is indicated in the format r x x General Information 3 1 General Specification Instrument specifications are listed on Page 3 10 These specifications are the performance standards or limits against which the instrument is tested Safety Information The following general safety precautions must be observed during all phases of Operation service and repair of this instrument Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards o
83. tings listed in the following table HP 4934A Low Check Mid Check High Check Settings Low SET Min Max Min Max Min Max Threshold 60 dBrn 15 455 mV 19 457mV 24 495 mV 30 837 mV 38 822mV 48 874 mV 80 dBrn 0 1546 V 0 1946 V 0 2449 V 0 3084 V 0 3882 V 0 4887 V 100 dBrn 1 5455 V 1 9457 V 2 4495 V 3 0837 V 3 8822 V 4 8874 V 5 40 Performance Tests WARNING CAUTION Noise to Ground Accuracy SPECIFICATION TRANSMITTER Quiet terminated RECEIVER Filters C Message 3 kHz Flat 15 kHz Flat Program and 50 kBit Range 600 900 and 1200Q 50 to 130 dBrn Accuracy 1 5 dB DESCRIPTION A common mode signal from an AC Calibrator is used to check the Noise to Ground accuracy EQUIPMENT AC Calibrator DATRON 4707A WECO 310 Connector HP 1251 0695 PROCEDURE Hazardous voltages are present during this procedure only service trained personnel aware of the hazards involved should perform the test Ensure that the AC Calibrator OUTPUT is switched off or set to the minimum level before proceeding with the following procedure Performance Tests 5 41 1 Connect the equipment as shown in the following figure AC CALIBRATOR HE 2936A sac ed Rc ay Lea A H SIGNAL 310 WIRED FOR NOISE TO GROUND CHECK i 2 Set the HP 4934A as follows Measurement N T GND Transmitter TRMT Impedance 600Q Receiver RCV Impedance 6009 Display Mode RCV Filter C MSG 3 S
84. tmeter Reading 0 4306 to 0 4406V 0 2421 to 0 2478V 0 0859 to 0 0879V Performance Tests 5 21 Transmitter Flatness at 10 dBm SPECIFICATION Transmitter Flatness 20 Hz to 200 Hz 1 0 dB 200 Hz to 15 kHz 40 2 dB 15 kHz to 85 kHz 40 5 dB DESCRIPTION An AC Voltmeter and 600Q resistor are used to check the HP 4934A trans mitter flatness at 10 dBm over the frequency range 20 Hz to 85 kHz EQUIPMENT AC Voltmeter HP 3456A 600Q 0 01 Resistor HP 0811 3502 PROCEDURE 1 Connect the 600Q resistor across the AC Voltmeter input 2 Connect the HP 4934A TRMT port to the AC Voltmeter input 3 Set the HP 4934A as follows Measurement LEVEL FREQ Transmitter TRMT Impedance 6009 Display Mode TRMT Transmitter Frequency 1004 Hz 4 Adjust the HP 4934A transmitter output level until a reading of 2 4495 V is obtained on the AC Voltmeter 5 Set the HP 4934A transmitter frequency to each of the values in the following table and check the AC Voltmeter readings 5 22 Performance Tests HP 4934A Transmitter Frequency AC Voltmeter Reading 20 Hz 200 Hz 5 kHz 15 kHz 30 kHz 85 kHz 2 1831 to 2 7484 V 2 3937 to 2 5065 V 2 3937 to 2 5065 V 2 3937 to 2 5065 V 2 3125 to 2 5946 V 2 3125 to 2 5946 V Performance Tests 5 23 CAUTION Transmitter Flatness at 40 dBm SPECIFICATION Transmitter Flatness 20 Hz to 200 Hz gt 1 0dB 200 Hz to 15 kHz 0 2 dB 15 kHz to 85 kHz
85. tor across the AC Voltmeter input 2 Connect the HP 4934A TRMT port to the AC Voltmeter input 3 Set the HP 4934A as follows Measurement LEVEL FREQ Transmitter TRMT Impedance 600Q Display Mode TRMT Transmitter Frequency 1004 Hz 4 Set the HP 4934A transmitter output level to amaximum by turning the OUTPUT LEVEL control fully clockwise The reading on the AC Voltmeter should be greater than 3 42 V 5 Set the HP 4934A transmitter output level to a minimum by turning the OUTPUT LEVEL control fully counter clockwise The reading on the AC Voltmeter should be less than 0 00775 V 5 20 Performance Tests Transmitter Level Accuracy SPECIFICATION Level Accuracy at 1004 Hz 19 dBm to 0 dBm 0 1 dB typical DESCRIPTION An AC Voltmeter and 600Q resistor are used to check the HP 4934A trans mitter output level accuracy at 1004 Hz EQUIPMENT AC Voltmeter HP 3456A 60002 0 01 Resistor HP 0811 3502 PROCEDURE 1 Connect the 6000 resistor across the AC Voltmeter input 2 Connect the HP 4934A TRMT port to the AC Voltmeter input 3 Set the HP 4934A as follows Measurement LEVEL FREQ Transmitter TRMT Impedance 600Q Display Mode TRMT Transmitter Level Frequency 0dBm 1004 Hz Check the reading on the AC Voltmeter is between 0 7657 and 0 7836 V Set the HP 4934A transmitter output level to each of the values in the following table and check the AC Voltmeter readings HP 4934A Output Level AC Vol
86. turn to bench warranty Option 1A3 For Bell Operating Companies Provides Bellcore Common Language Equipment Identification CLEI compliance Product and Shipping carton labeling 3 8 General Information Accessories Supplied The accessories supplied with the HP 4934A are Accessories Supplied Part Number Power Cord HP 8120 1378 Operating and Calibration Manual HP 04934 90054 Test Cords Two 1m WECO 310 to WECO 310 cables HP 15513A Instruction Label HP04934 90002 The Instruction Label is primarily intended to be fixed to the inside of the front cover However it is supplied loose so that you can fix it to a location of your choice The location should be a flat clean dry surface To fix the label remove the protective backing then carefully position the label on the flat surface Accessories Available The following accessories are available and may have been ordered with the HP 4934A HP 18182A HP 15678A HP 15677A HP E6321A 1 5m 60 inch test cord with a 310 male connector and alligator clips 19 inch rack mount kit Ladder bracket Soft vinyl carrying case with handles and shoulder strap and space for manuals and test cords General Information 3 9 Bl Specifications This section details the specifications of the 4934A TIMS Except where otherwise stated the following parameters are warranted performance specifications Parameters described as typical or nominal are sup
87. uency Counter Range 20 Hz to 10 MHz 001 HPS315A Hz resolution at20 Hz Decade Transformer Attenuation 0 to 85 dB Model DT72A DEKATRAN 600Q Resistor 0 01 0 25W HP 0811 3502 100Q Resistor 1 0 25W HP 0757 0178 20 dB Amplifier and4kHz Details of the specification and SAI low pass filter construction are in Appendix A which is at the rear of this manual Power Adder Details of the specification and SA2 construction are in Appendix B which is at the rear of this manual HP 1252 0695 WECO 310 type connector 5 2 Performance Tests Operational Verification The Operational Verification tests quickly establish with gt 90 confidence that the HP 4934A meets the specifications listed in Chapter 3 If any test fails to meet specification refer to the Adjustments in Chapter 5 of the Ser vice Manual If after adjustment the specification still cannot be met refer to the troubleshooting in Chapter 8 of the Service Manual The following table lists all the Operational Verification Tests Operational Verification What to Do Transmitter Frequency Carry out the Performance Test on Page 5 19 at the following frequencies 20 Hz 1000 Hz 50 kHz and110 kHz Transmitter Level Carry out the Performance Test on Page 5 20 Receiver Frequency Carry out the procedure on Page 5 4 Receiver Level Carry out the procedure on Page 5 5 Weighting Filters

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