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Service Manual SD-32 Sampling Head 070–8269–01

1. 0435 LEWIS SCREW CO TK1163 POLYCAST INC TK1465 BEAVERTON PARTS MFG CO TK1916 SKS DIE CASTING CO 0GZV8 HUBER AND SUHNER INC 80009 TEKTRONIX INC SD 32 Service Manual Address 4300 S RACINE AVE 9898 SW TIGARD ST 1800 NW 216TH AVE 2200 4TH 500 WEST CUMMINGS PARK 14150 SW KARL BRAUN DR PO BOX 500 City State Zip Code CHICAGO IL 60609 3320 TIGARD OR 97223 HILLSBORO OR 97124 6629 BERKELEY CA 94710 2215 WOBURN MA 01801 BEAVERTON OR 97077 0001 5 3 Replaceable Parts Fig amp Index No Tektronix Part No 366 0673 00 5 4 334 8148 00 333 3857 00 211 0030 00 380 0980 00 657 0083 50 011 0158 00 015 1020 00 070 8268 01 070 8269 01 067 1338 00 067 1338 01 067 1338 02 067 1338 03 067 1338 05 067 1338 06 Serial No Effective Dscont Qty 12345 Name amp Description KNOB O 096 ID X 0 24 OD X 0 299H MARKER IDENT MKD SD32 FRONT PANEL PANEL FRONT ATTACHING PARTS SCREW MACHINE 2 56 X 0 25 FLH STL END ATTACHING PARTS HSG SAMPLING HEAD MODULAR ASSY SD32 FIELD REPLACEABLE UNIT STANDARD ACCESSORIES ADPTR COAX 2 92MM K FEM 1 85MM V MALE TERM COAXIAL SHORT CIRCUIT SMA MANUAL TECH USER SD32 MANUAL TECH SERVICE SD32 OPTIONAL ACCESSORIES FIXTURE CAL SAMPLING HEAD CAL UNIT STANDARD FIXTURE CAL SAMPLING HEAD CAL UNIT EUROPEAN FIXTURE CAL SAMPLING HEAD CAL UNIT UNITED KINGDOM FIXTURE CAL SAMPLING HEAD CALUNIT AUSTRALIAN FIX
2. 0 Step 12 Press the CW Output Select button on the Signal Source enter 50 on the keypad then press the MHz button to enter the 50 MHz reference frequency 0 Step 13 Press the RF On button if necessary to activate the output NOTE Perform the next step only once 2 33 Checks and Adjustments 0 Step 14 Press the RF Level 1 button on the Signal Source Using the Signal Source knob adjust the Signal Source output level to obtain a reading of 8 0 dBm x 0 1 dBm on the Power Meter Make this adjust ment only once do not adjust it at other frequencies 0 Step 15 Press the CW Output Select button on the Signal Source to terminate level adjustment and enable frequency adjustment L Step 16 Read the power in dBm from the Power Meter and then record this value in the Measured Power column of Table 2 12 located on page 2 45 for later use Refer to Table 2 5 for example entries Table 2 5 Signal Source Response 0 Hz 40 GHz Example Values Frequency Measured Power Sensor Adapter Corrected GHz Power Cal Factor Correction Power dBm Factor dBm 0 05 GHz 8 04 1 000 1 014 7 98 10 GHz 8 43 0 986 1 048 8 17 20 GHz 8 61 0 970 1 067 8 20 30 GHz 8 63 0 942 1 087 8 01 40 GHz 8 98 0 935 1 092 8 31 0 Step 17 Enter the next frequency listed in Table 2 12 into the Signal Source by entering the frequency in GHz on the keypad then press the GHz button 0 Step 18 Repeat Steps 16 and 17 for
3. Response dB 1 00 0 28 1 71 Limit 3 dB 3 dB 3 dB 2 43 Checks and Adjustments Correct the Freguency Response gain values for the measurement error as follows L Step 4 Subtract the Measurement Error from the Frequency Response for each frequency and then record these values in the NORMALIZED Frequency Response column in Tables 2 16 and 2 17 as follows Normalized Frequency Response Frequency Response Measurement Error L Step 5 Check that the Normalized Frequency Response value is within the specified measurement limits Calculation Tables for this Procedure Use these tables to record calculations and results for this section You may want to photocopy these pages Table 2 11 Calculation of Adapter Correction Factors Adapter Scattering Power Sensor Parameters Reflection Coefficient 22 21 p or Rho Adapter Frequency Mag Phase Mag Mag Phase Correction Example 22 22 21 Factor 0 05 GHz 10 GHz 20 GHz 30 GHz 40 GHz 44 GHz 50 GHz 1 Information supplied with adapter Fixed values as supplied by instrument vendor 2 44 Checks and Adjustments Checks and Adjustments Table 2 12 Signal Source Response 0 Hz 40 GHz Frequency Measured Power Sensor Adapter Corrected GHz Power Cal Factor Correction Power dBm Factor dBm 0 05 GHz 10 GHz 20 GHz 30 GHz 40 GHz Table 2 13 Signal Source Response 40 GHz 50 GHz Frequency Measured Power Sensor Adapter Correc
4. 14 and Table 2 15 using the following formula Calculated System Power in dBm 10109 412 5 Corrected Amplitude in v Record these values in the Calculated System Power column of Table 2 14 and Table 2 15 2 42 Checks and Adjustments Checks and Adjustments L Step 3 To determine the frequency response of the sampling head only subtract the frequency response of the Signal Source from the response of the system as follows Frequency Response Calculated System Power Corrected Power Use Calculated System Power from Tables 2 14 and 2 15 use Corrected Power from Tables 2 12 and 2 13 Record these values in the Frequency Response column of Tables 2 16 and 2 17 See also Tables 2 9 and 2 10 for example entries Table 2 9 Sampling Head Frequency Characterization 0 2 40 GHz Example Values Frequency Frequency GHz 0 05 GHz 10 GHz 20 GHz 30 GHz 40 GHz Response dB 0 07 0 39 0 74 0 57 0 78 Measurement Error dB 0 07 0 07 0 07 0 07 0 07 Normalized Measurement Frequency Response dB 0 00 0 46 0 81 0 64 0 85 Limit 3 dB 3 dB 3 dB 3 dB 3 dB Table 2 10 Sampling Head Frequency Characterization 40 GHz 50 GHz Example Values Frequency Frequency Response dB GHz 40 GHz 45 GHz 50 GHz SD 32 Service Manual 0 93 0 21 1 78 Measurement Error dB 0 07 0 07 0 07 Normalized Measurement Frequency
5. ATTENTION High Voltage ground earth Refer to terminal manual Grounding the Instrument The sampling head is grounded through the grounding conductor of the oscilloscope s power cord To avoid electric shock plug the power cord into a properly wired receptacle before connecting to the product input or output terminal A protective ground connection by way of the grounding conduc tor in the power cord is essential for safe operation Danger Arising from Loss of Ground Upon loss of the protective ground connection all accessible conductive parts including knobs and controls that may appear to be insulating can render an electric shock General Information SD 32 Service Manual General Information Do Not Operate in Explosive Atmospheres To avoid explosion do not operate the sampling head in an atmosphere of explosive gasses 1 3 General Information Installing and Removing the Sampling Head 1 4 To avoid damage to the instrument set the instrument s ON STANDBY switch to STANDBY before installing or removing sampling head The SD 32 Sampling Head slides into the one of the front panel compart ments of an 11800 Series Digital Sampling Oscilloscope or CSA 803 Series Communications Signal Analyzer Figure 1 1 shows the front panels of the instruments and the locations of the sampling head compartments Sampling Head Compartments 11801B m E m m E a L Sampling Head Compartments CSA 803A
6. ON STANDBY switch to STANDBY and then switch it back to ON Step 14 To verify the new identification number press the UTILITY button and then touch Identify The new identification number now appears under Mainframe Sampling Heads in the System Identification pop up menu Maintenance System Functional Overview SD 32 Service Manual Theory of Operation The SD 32 is a single channel high performance sampling head that can be installed in the 11800 Series Digital Sampling Oscilloscopes the SM 11 Multi Channel Unit and the CSA 803 Series Communications Signal Analyzers This section describes and illustrates the major functions of the SD 32 Sampling Head see Figure 4 1 Strobe Drive Strobe Sense Strobe Generator Acquisition System Sampled Signal Output Figure 4 1 SD 32 Sampling Head Block Diagram The sampling head acquisition system performs the function of a very fast sample and hold circuit for the mainframe instrument It uses local analog feedback to achieve high accuracy and high throughput for repetitive input signals For random input signals like those found in eye diagram measure ments accuracy depends on the dot transient response of the sampling head Dot response can easily be adjusted through the enhanced accuracy menu in the mainframe The strobe drive signal from the instrument controls the timing of the strobe assertion to the acquisition system The strobe sense
7. SD 32 Service Manual 2 13 Checks and Adjustments Check dot response at 500 mV with automatic calibration set tings by performing Steps 32 through 52 0 Step 32 Press the UTILITY button and touch Enhanced Accuracy 11801A B and CSA 803 Series or press the ENHANCED ACCURACY button 11801 2 0 Step 33 Touch Loop Gain L Step 34 Set Divide by Two Mode to Off in the Loop Gain Calibration pop up menu 0 Step 35 Touch Exit 0 Step 36 Set the Vert Size M1 to 100 mV div L Step 37 Set the pulse generator s amplitude for a 500 mV peak peak display 0 Step 38 Touch Cursors on the top of the screen 0 Step 39 Set Cursor 1 to the average of the bottom of the pulse before the step 0 Step 40 Set Cursor 2 to the average of the top of the pulse L Step 41 Read AV as the peak to peak step amplitude and then record this value as V for later use 0 Step 42 Press the UTILITY button and touch Enhanced Accuracy 11801A B and CSA 803 Series or press the ENHANCED ACCURACY button 11801 2 0 Step 43 Touch Loop Gain and then the channel number you are using in the Loop Gain Calibration pop up menu L Step 44 Set Divide by Two Mode to On in the Loop Gain Calibration pop up menu 0 Step 45 Touch Cursors at the top of the screen 0 Step 46 Set Cursor 1 to the average of the bottom of the pulse before the step L Step 47 Set Cursor 2 to the average of the bottom of the pulse after the step 0 Step 48 Rea
8. There are three sections to the procedure Measuring the Signal Source Output Measuring the System Frequency Response and Calculating the Sampling Head Frequency Response The first two sections have their own set ups and involve making measurements The third part mathematically combines the results of the first two parts All three sections must be performed twice once for the 0 Hz 40 GHz frequency range and once for the 40 GHz 50 GHz frequency range Refer to Table 2 2 at the beginning of Checks and Adjustments for mini mum equipment specifications and typical equipment types recommended in performing this procedure In this procedure the term Signal Source is used to refer to both the Frequency Synthesizer used to test the 0 Hz 40 GHz range and the Sweep Generator used to test the 40 GHz 50 GHz range Measurement Limits The measurement limits for bandwidth are 3 dB lt Normalized Frequency Response x 3 dB Measuring the Signal Source Output NOTE Before beginning this test power on all test equipment as listed in Procedure 1 and allow it to warm up for at least 30 minutes 0 Step 1 Calculate the correction factors to compensate for the adapter Wiltron SC4193 used on the Power Sensor input Enter the data supplied with the adapter and power sensor into Table 2 11 located on page 2 44 Use the following formula to calculate the result adapter correction factor for each frequency entry and enter the r
9. a mV an A 500 mV with automatic calibration settings at 500 mV with default settings Measurement Limits The measurement limits for the dot transient response error are m lt 5 error when measured at 250 mV and 500 mV with automatic calibration settings m 20 error when measured at 500 mV with default settings Setup to Check Dot Transient Response 2 4mm SMA SMA BNC Adapter Adapter 5X Attenuator 11801B mm Pulse Generator Trigger In Internal Clock Output va 2X Attenuator SMA BNC Adapter not connected yet Output 2 4mm SMA SMA BNC Adapter Adapter 5X Attenuator CSA 803A Pulse Generator Trigger 99 Output Internal Clock Output 2X Attenuator not connected yet SMA BNC Adapter SD 32 Service Manual 2 11 Checks and Adjustments Procedure to Check Dot Transient Response L Step 1 Initialize the instrument settings then make the following set tings in the order listed Sampling Head CH 1 SELECT CHANNEL On Instrument Mainframe Vertical icon oodd cus nec un S NAE press Vert Size M1 noD ete ee DEI 50 mV division TRIGGER button press Source siad gcara eee daiwa Shei m Pes den Internal Clock Horizontal lt gt press Main POS 22205 E pantie ute ebd bs press Setto Min ouv away ODER VAM WIE press Main Size 22 0 Ete nee ee ee 20 ns divisi
10. ambient temperature is between 0 C and 4 50 C Store the sampling head in ambient temperatures from 40 C to 75 C After storage at temperatures outside the operating limits allow the chassis to reach the operating temperature range before applying power Measurement accuracy can be improved after a 20 minute warm up period by performing the calibrations in the Enhanced Accuracy menu of the mainframe instrument Calibrations should be repeated if the temperature changes more than 5 C or if the sampling head is removed from the instrument 1 7 General Information 1 8 General Information Checks and Adjustments This section contains procedures to check the specifications and measure ment limits listed in Table 2 1 The Specification or Measurement Limit is listed at the beginning of each procedure as well These procedures contain only check steps since the SD 32 Sampling Head has no internal adjust ments The parts in this section provide a logical sequence of checks for performing a comprehensive performance verification procedure to verify that the sampling head meets specifications To functionally test the sam pling head perform the parts in Table 2 1 which have a yes in the Func tional Test column Refer to the SD 32 Sampling Head User manual for more information about specifications and sampling head operation Refer to Table 2 2 for informa tion concerning test equipment used in the setups Table 2 1 Mea
11. menu Step 8 Touch the vertical 4 icon and then set Vert Size M1 to 50 mV div Step 9 Press the MEASURE button Step 10 Touch Measurements and then Mean in the Measurements pop up menu Step 11 Touch Mean in the MEASURE major menu and then set Data Interval to whole zone in the Mean pop up menu Step 12 Check that Mean is 0 V 200 mV OO OO Step 13 Press the UTILITY button and touch Enhanced Accuracy 11801A B and CSA 803 Series or press the ENHANCED ACCURACY button 11801 2 0 Step 14 Touch Offset Null 0 Step 15 Touch Automatic Calibrate and then Proceed in the Offset Nulling pop up menu 0 Step 16 Press the MEASURE button 0 Step 17 Examine that the Mean offset is 0 V 2 mV SD 32 Service Manual 2 17 Checks and Adjustments Setup to Check Offset Change with Repetition Rate SMA 50 Q 2 4mm SMA Adapter Termination 11801B a mI m m m m L Generator Output SMA BNC Adapter 50 Q Coaxial Cable SMA 50 Q 2 4mm SMA Adapter Termination CSA 803A Generator SMA BNC Adapter 50 Q Coaxial Cable Procedure to Check Offset Change with Repetition Rate L Step 1 Initialize the instrument settings then make the following set tings in the order listed Sampling Head CH 1 SELECT CHANNEL Instrument Mainframe ENHANCED ACCURACY button 11801 2 press UTILITY button 11801A B CSA 803 Series p
12. of Operation The offset null adjustment removes unwanted DC offset that may be present in the sampling head This adjustment effectively zeroes the sampling head so that an input signal with 0 V of amplitude delivers a 0 V output If offset null is not adjusted correctly then measurements taken at the instru ment mainframe will be incorrect The absolute voltage values for any cur sors displayed on the trace will be incorrect as well 4 3 Theory of Operation 4 4 Theory of Operation Replaceable Parts This section contains a list of the components that are replaceable for the SD 32 Sampling Head As described below use this list to identify and order replacement parts Parts Ordering Replacement parts are available from or through your local Tektronix Inc Information service center or representative Changes to Tektronix instruments are sometimes made to accommodate improved components as they become available and to give you the benefit of the latest circuit improvements Therefore when ordering parts it is important to include the following information in your order m Part number m Instrument type or model number m Instrument serial number m Instrument modification number if applicable If a part you order has been replaced with a different or improved part your local Tektronix service center or representative will contact you concerning any change in the part number Change information if any is located at
13. of Operation Theory of Operation 4 1 System Functional Overview 4 1 Loop Gain i o e eR ERR Rr m ER 4 2 Offset Null 124411803 I XE EE 4 3 Replaceable Parts Replaceable Parts 5 1 Parts Ordering Information 5 1 Using the Replaceable Parts 5 2 ii Contents SD 32 Service Manual List of Figures Figure 1 1 Sampling Head Compartments in an 11801B and a CSA 603A Hinged Sea une te Ee AA 1 4 Figure 1 2 Installing a Sampling Head in an Instrument 1 5 Figure 2 1 Locations of Controls and Connectors on Mainframe Irnistruments 2 8 Figure 3 1 Sampling Head Screw Locations 3 5 Figure 3 2 A5 Time Base Controller Board Jumper Location 3 6 Figure 4 1 SD 32 Sampling Head Block Diagram 4 1 Figure 4 2 Displayed Traces at Various Loop Gain Settings 4 2 Figure 5 1 Exploded View of the SD 32 Sampling Head 5 5 iii List of Figures iv Contents SD 32 Service Manual List of Tables Table 2 1 Measurement Limits and Specifications Table 2 2 Test Equipment Table 2 3 Aberration Measurement Limits Table 2 4 Calculation of Adapter Correction Example Values Table 2 5 Signal
14. offset with repetition rate Measurement Limits The measurement limit for the offset is O V 2 mV Specifications The specification for the offset change with repetition rate is 0 V 5 mV Setup to Examine Offset SMA 50 Q 2 4mm SMA Adapter Termination 11801B E mI A E E mI L SMA 50 Q 2 4mm SMA Adapter Termination CSA 803A amm 2 16 Checks and Adjustments Checks and Adjustments Procedure to Examine Offset L Step 1 Initialize the instrument settings then make the following set tings in the order listed Sampling Head CH 1 SELECT CHANNEL On Off On Instrument Mainframe TRIGGER press Source Internal Clock ENHANCED ACCURACY button 11801 2 press UTILITY button 11801A B CSA 803 Series press Enhanced Accuracy 11801A B CSA 803 Series touch Calibrate All pop up menu Recall Defaults 0 Step 2 Press the WAVEFORM button then select Acquire Desc in the major menu Step 3 In the pop up menu select Average N to turn averaging and then select Set Avg N L Step 4 Use the upper knob to set the Average N value to 32 0 Step 5 Touch Offset Null in the Enhanced Accuracy menu 0 Step 6 Touch Manual Calibrate in the Offset Nulling pop up menu 0 Step 7 Touch the Offset Null M1 selector 0 and then Enter in the Numeric Entry amp Knob Res pop up
15. the Maintenance section in the Serv ice Manual for your instrument for more information on accessing this board See Figure 3 2 for the location of jumper J860 J860 Figure 3 2 A5 Time Base Controller Board Jumper Location Maintenance Maintenance 0 Step 2 Boot up the PC with MS DOS operating 0 Step 3 Connect the serial cable to the instrument s RS 232 C port located at the rear of the instrument Connect the other end of the cable to the COM1 port on the PC L Step 4 Install the sampling head in any sampling head compartment in the instrument Step 5 Set the PRINCIPAL POWER SWITCH to ON and the ON STANDBY switch to ON Step 6 After the diagnostics are complete press the UTILITY button and then touch RS 232 Parameters Stop Bits to 1 in the RS 232 Parameters pop up menu Step 8 Insert the Sampling Head Utility Software floppy disk provided in this manual into the A drive of the system contro
16. the rear of this manual Module Replacement The SD 32 Sampling Head is serviced by module replacement so there are three options you should consider Module Exchange In some cases you may exchange your module for a remanufactured module These modules cost significantly less than new modules and meet the same factory specifications For more infor mation about the module exchange program call 1 800 TEKWIDE ext 6630 Module Repair You may ship your module to us for repair after which we will return it to you New Modules You may purchase new replacement modules in the same way as other replacement parts SD 32 Service Manual 5 1 Replaceable Parts Using the The tabular information in the Replaceable Parts List is arranged for quick retrieval Understanding the structure and features of the list will help you Replaceable find the all the information you need for ordering replacement parts Parts List Item Names In the Replaceable Parts List an Item Name is separated from the descrip tion by a colon Because of space limitations an Item Name may some times appear as incomplete For further Item Name identification U S Federal Cataloging Handbook H6 1 can be used where possible Abbreviations Abbreviations conform to American National Standards Institute ANSI standard Y1 1 5 2 Replaceable Parts Replaceable Parts CROSS INDEX MFR CODE NUMBER TO MANUFACTURER Mfr Manufacturer Code
17. 7 Checks and Adjustments Checks and 2 1 Test Equipment 2 3 Using These Procedures 2 6 Conventions in this 2 6 Initialized and Stored Settings 2 6 Menu Selections and Measurement Techniques 2 6 Setup Illustrations 2 7 Procedure 1 Power On 2 9 Procedure 2 Dot Transient Response 2 11 Proced re 3 Offsel 2 ool mei XR ITI 2 16 Procedure 4 Noise 2 20 Procedure 5 Acquisition Aberrations 2 23 Procedure 6 Maximum Signal Voltage 2 28 Procedure 7 Bandwidth 2 31 Maintenance Maintenance olio ao a a a eee 3 1 Preventive Maintenance 3 1 Exterior iius e ys einen a aa a ye 3 1 Periodic Electrical Checks 3 1 Static Sensitive Device Classification 3 2 SD 32 Service Manual i Table of Contents Exchanging Sampling Heads 3 4 Removing and Replacing the Sampling Head Internal CIRCUIINY cune Leere ox wal ee 3 4 Changing the Sampling Head Identification Number 3 6 Theory
18. Service Manual Tektronix SD 32 Sampling Head 070 8269 01 Warning The servicing instructions are for use by qualified personnel only To avoid personal injury do not perform any servicing unless you are qualified to do so Refer to the Safety Summary prior to per forming service Please check for change information at the rear of this manual First Printing May 1993 Instrument Serial Numbers Each instrument manufactured by Tektronix has a serial number on a panel insert or tag or stamped on the chassis The first letter in the serial number designates the country of manufacture The last five digits of the serial number are assigned sequentially and are unique to each instrument Those manufactured in the United States have six unique digits The country of manufacture is identified as follows B010000 Tektronix Inc Beaverton Oregon USA E200000 Tektronix United Kingdom Ltd London J300000 Sony Tektronix Japan H700000 Tektronix Holland NV Heerenveen The Netherlands Instruments manufactured for Tektronix by external vendors outside the United States are assigned a two digit alpha code to identify the country of manufacture e g JP for Japan HK for Hong Kong IL for Israel etc Tektronix Inc PO Box 500 Beaverton OR 97077 Printed in U S A Copyright Tektronix Inc 1991 1993 All rights reserved Tektronix products are covered by U S and foreign patents issued and pending The following ar
19. Source Response 0 Hz 40 GHz Example Values Table 2 6 Signal Source Response 40 GHz 50 GHz Example Values Table 2 7 System Response 0 2 40 GHz Example Values Table 2 8 System Response 40 GHz 50 GHz Example Values Table 2 9 Sampling Head Frequency Characterization 0 2 40 GHz Example Values Table 2 10 Sampling Head Frequency Characterization 40 GHz 50 GHz Example Values Table 2 11 Calculation of Adapter Correction Factors Table 2 12 Signal Source Response 0 Hz 40 GHz Table 2 13 Signal Source Response 40 GHz 50 GHz Table 2 14 System Response 0 Hz 40 GHz Table 2 15 System Response 40 GHz 50 GHz Table 2 16 Sampling Head Frequency Characterization O H2 40 GHZ eet canes AUR edition Table 2 17 Sampling Head Frequency Characterization 40 GHzZ 50 dar dated hr oed dp ia we Table 3 1 Relative Susceptibility to Electrostatic Discharge ESD 2 36 2 39 2 40 2 43 2 43 2 44 2 45 2 45 2 45 2 46 2 46 2 46 3 3 List of Tables vi Contents Introduction SD 32 Service Manual General Information This section gives all the information needed to apply power to the SD 32 Sampling Head Safety information as well as information on installing and removing the s
20. TURE CAL SAMPLING HEAD CAL UNIT SWITZERLAND FIXTURE CAL SAMPLING HEAD CAL UNIT JAPANESE Mfr Code TK1163 80009 TK1916 0435 1465 80009 80009 0G2V8 80009 80009 80009 80009 80009 80009 80009 80009 Mfr Part No ORDER BY DESC 334814800 ORDER BY DESC ORDER BY DESC ORDER BY DESC 657008350 011015800 645 50 0 1 070826801 070826901 067133800 067133801 067133802 067133803 067133805 067133806 Replaceable Parts SD 32 Service Manual Q gt Y A 7 27 Figure 5 1 Exploded View of the SD 32 Sampling Head Replaceable Parts 5 5 Replaceable Parts 5 6 Replaceable Parts
21. ampling head packaging for shipment and environmental conditions such as operating temperature is included here The SD 32 Sampling Head Service Manual is designed for use by qualified service personnel It contains information necessary to check and maintain the SD 32 Sampling Head The SD 32 Sampling Head is a single channel 50 GHz bandwidth sampling head It is designed for use in the the 11800 Series Digital Sampling Oscillo scopes the SM 11 Multi Channel Unit and the CSA 803 Series Communica tions Signal Analyzers General Information Safety Summary The general safety information in this part of the summary is for both operat ing and servicing personnel Specific warnings and cautions will be found throughout the manual where they apply but may not appear in this sum mary Terms in Manuals CAUTION statements in manuals identify conditions or practices that could result in damage to the equipment or other property WARNING statements in manuals identify conditions or practices that could result in personal injury or loss of life Terms on Equipment CAUTION on equipment means a personal injury hazard not immediately accessible as one reads the marking or a hazard to property including the equipment itself DANGER on equipment means a personal injury hazard immediately acces sible as one reads the marking Symbols in Manuals Static Sensitive Devices Symbols on Equipment 4 AN DANGER Protective
22. and store the sampling heads on a metal surface or conductive foam Trans port the sampling heads with short circuit terminations on the inputs Label any package that contains static sensitive assemblies or components L Step 3 Discharge the static voltage from your body by wearing a wrist strap while handling these components Service static sensitive assem blies or components only at a static free work station by qualified service personnel Use a static control mat and wrist strap Step 4 Clear the work station surface of anything that can generate or hold a static charge Step 5 Keep the component leads shorted together whenever possible L Step 6 Pick up components by the body never by the leads L Step 7 Do not slide the components over any surface Step 8 Avoid handling components areas that have floor or work surface covering capable of generating a static charge Maintenance SD 32 Service Manual Maintenance Table 3 1 Relative Susceptibility to Electrostatic Discharge ESD Semiconductor Classes Relative Susceptibility Levels MOS or CMOS microcircuits or discrete circuits or 1 linear microcircuits with MOS inputs most sensitive ECL 2 Schottky signal diodes 3 Schottky TTL 4 High frequency bipolar transistors 5 JFET 6 Linear microcircuits 7 Low power Schottky TTL 8 TTL least sensitive 9 1Voltage equivalent for levels voltage discharged from a 100 pF capacit
23. average of the top of the pulse at 500 ns after the step is on the horizontal centerline Step 10 Set Vert Size M1 to 5 mV div Step 11 Touch Vert Offset M1 and then Fine in the Numeric Entry amp Knob Res pop up menu Step 12 Set Vert Offset M1 so that the average of the top of the pulse 500 ns after the step is on the horizontal centerline OO Step 13 Set the Main Size to 200 ns div 2 29 Checks and Adjustments L Step 14 Examine that the magnitude of the maximum positive and negative aberrations that occur between 200 ns and 800 ns from the rising edge of the step is lt 2 vertical divisions from the horizontal center line 196 of the step amplitude 0 Step 15 Touch the horizontal icon and then set the Main Size to 20 ns div 0 Step 16 Set the Main Pos so that the step is within 1 2 division of the left most edge of the screen L Step 17 Examine that the magnitude of the maximum positive and negative aberrations that occur between 10 ns and 200 ns from the rising edge of the step is lt 2 vertical divisions from the horizontal center line 196 of the step amplitude 2 30 Checks and Adjustments Checks and Adjustments Procedure 7 This procedure shows the setups and lists the steps to check the band Bandwidth width The procedure given is a manual method therefore only a few fre quency points are measured If a more thorough characterization is desired the procedure can be automated
24. d 3 ns after the step is lt 2 vertical divisions from the horizontal center line 4 of the step amplitude Step 20 Touch the vertical icon and then set the Vert Size M1 to 10 mV div Step 21 Touch the horizontal icon and then set the Main Size to 50 ps Step 22 Set the Main Pos so that the rising edge of the step is at the left most edge of the screen Step 23 Examine that the magnitude of the maximum positive aberra tion that occurs in the first 300 ps after the step is 3 5 vertical divisions from the horizontal centerline 1496 of the step amplitude Step 24 Examine that the magnitude of the maximum negative aberra tion that occurs in the first 300 ps after the step is lt 1 75 vertical divi sions from the horizontal centerline 7 of the step amplitude Step 25 Touch the Main Pos selector and then Set to Min in the Numeric Entry and Knob Res pop up menu Step 26 Set the Main Size to 10 ns div Step 27 Touch the vertical icon and then set Vert Offset M1 so that the average of the bottom of the pulse at 10 ns before the step is at the horizontal centerline Step 28 Touch the horizontal icon and then set the Main Size to 1 ns div Step 29 Set the Main Pos so that the rising edge of the step is at the right most edge of the screen Step 30 Examine that the magnitude of the maximum positive and negative aberrations that occur between 10 ns and 500 ps before the 1096 point of the step i
25. d Functions pop up menu 0 Step 18 Press the MEASURE button 0 Step 19 Examine that RMS is less than 1 mV 2 22 Checks and Adjustments Procedure 5 Acquisition Aberrations SD 32 Service Manual Checks and Adjustments This procedure shows the setup and lists the steps to check acquisition aberrations Measurement Limits The measurement limits for acquisition aberrations are listed in Table 2 3 Aberration Measurement Limits Table 2 3 Aberration Measurement Limits Time Difference from the Rising Aberration Measurement Limits Edge of Waveform 0 to 300 ps 7 lt aberration x 1496 300 ps to 3 ns 4 x aberration 96 x 6 596 3 ns to 100 ns 1 296 x aberration 1 296 100 ns and up 0 6 x aberration 96 x 0 696 10 ns to 20 ps 4 lt aberration x 496 2 23 Checks and Adjustments Setup to Examine Acquisition Aberrations Calibration Step Generator 2 4mm SMA Adapter Remote Head Calibration Step Generator Power Supply fa n 11801B Calibration Step Generator Control Unit LLLLLL Power Trigger Supply Input w q Standby Internal Clock Output Calibration Step Generator 2 4mm SMA Adapter Remote Head Calibration Step Generator Power Supply fan CSA 803A Calibration Step Generator Control Unit Power Trigger On Supply Input cS Standby Internal Clock Output 2 24 Checks and Adjustments SD 32 Service Ma
26. d the AV value and then record this value as VL for later use 0 Step 49 Set Cursor 2 to the average of the top of the pulse 0 Step 50 Read AV and then record this value as VH for later use L Step 51 Check that the negative dot response error VL VH x 10096 is within 3 596 Checks and Adjustments SD 32 Service Manual Checks and Adjustments Step 52 Check that the positive dot response error 10096 x VH V V VL is within 596 Check dot response at 500 mV with default settings by perform ing Steps 53 through 62 Step 53 Press the UTILITY button and touch Enhanced Accuracy 11801A B and CSA 803 Series or press the ENHANCED ACCURACY button 11801 2 0 Step 54 Touch Loop Gain 0 Step 55 Touch Recall Defaults in the Loop Gain Calibration pop up menu 0 Step 56 Touch Exit L Step 57 Touch Cursors at the top of the screen 0 Step 58 Set Cursor 1 to the average of the bottom of the pulse before the step 0 Step 59 Set Cursor 2 to the average of the bottom of the pulse after the step 0 Step 60 Read the AV value and then record this value as VL for later use 0 Step 61 Set Cursor 2 to the average of the top of the pulse and read AV Record this value as VH L Step 62 Examine that the negative dot response error VL VH x 100 is x 20 6 2 15 Checks and Adjustments Procedure 3 This procedure shows the setup and lists the steps to examine offset and Offset check
27. e Desc selector in the WAVEFORM major menu shows that eight averages have been completed 0 Step 18 Press the MEASURE button 0 Step 19 Check that AMean offset with a repetition rate is 0 V 5 mV C Step 20 Continue to decrease the time mark generator s marker set ting and repeat Steps 16 19 for each setting down to 0 1 us 2 19 Checks and Adjustments Procedure 4 Noise 2 20 This procedure shows the setup and lists the steps to check noise from the sampling head Measurement Limits For the SD 32 Sampling Head the measurement limit for noise is 2 3 MVays without smoothing and 1 mVnpws with smoothing Setup to Examine Noise SMA 50 Q 2 4mm SMA Adapter Termination 11801B O L LLLLLL Calibrator Output not connected yet 12 RF Cable SMA 50 Q 2 4mm SMA Adapter Termination CSA 803A L LLLLLL Calibrator Output 12 RF Cable not connected yet Checks and Adjustments Checks and Adjustments Procedure to Examine Noise L Step 1 Initialize the instrument settings then make the following set tings in the order listed Sampling Head CH 1 SELECT CHANNEL On Instrument Mainframe TRIGGER button press Internal Clock Man SZE stet tarda Seth ise Seda NE edis 20 ns div ENHANCED ACCURACY button 11801 2 press UTILITY button 11801A B CSA 803 Series press Enhanced Accu
28. e registered trademarks TEKTRONIX TEK TEKPROBE and SCOPE MOBILE WARRANTY Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one 1 year from the date of shipment lf any such product proves defective during this warranty period Tektronix at its option either will repair the defective product without charge for parts and labor or will provide a replacement in exchange for the defective product In order to obtain service under this warranty Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service Customer shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix with shipping charges prepaid Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located Customer shall be responsible for paying all shipping charges duties taxes and any other charges for products returned to any other locations This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish service under this warranty a to repair damage resulting from attempts by personnel other than Tektronix representatives to install repair or service the product b
29. each frequency listed in Table 2 12 2 34 Checks and Adjustments SD 32 Service Manual Checks and Adjustments Setup to Measure the Output Power of the Signal Source 40 GHz 50 GHz Test Power Meter 1 Waveguide Detector 8487A Power Sensor Signal Source Characterized VF VF Adapter 10 dB Attenuator WR 19 to VM Adapter External RF Output Waveguide Input Coupler Steps to Measure the Output Power of the Signal Source 40 GHz 50 GHz Test 0 Step 19 Connect the Power Sensor through the 10 dB attenuator adapter and waveguide coupler to the RF output of the Signal Source 0 Step 20 Press the Level button on the Signal Source enter 0 on the keypad then press the GHz dBm button to set the indicated power to 0 dBm 0 Step 21 Press the CW CF button on the Signal Source Enter the first frequency in the 40 GHz to 50 GHz range to be measured for example 40 on the keypad then press the GHz dBm button to enter the frequency 0 Step 22 Press the RF On button if necessary to activate the output L Step 23 Press the Detector Leveling button if necessary to turn on the adjacent light NOTE Perform the next step only once 0 Step 24 Adjust External ALC Gain on the Signal Source until the Power Meter reads 10 0 dBm 0 1 dBm Make this adjustment only once do not adjust it at other frequencies 2 35 Checks and Adjustments L Step 25 Read the power in dBm fr
30. ectors controls and indicators for example Position on associated test equipment Initial Capital letters also identify adjustments inside the sampling head In some steps the first word is italicized to identify a step that contains a performance verification or an adjustment instruction For example if Check is the first word in the title of a step an electrical specification is checked If Adjust appears in the title the step involves an electrical adjustment If Examine is the first word in the title the step concerns measurement limits that indicate whether the sampling head is operating properly these limits are not to be interpreted as electrical specifications Initialized and Stored Settings At the beginning of most steps you are instructed to Initialize the instru ment as part of the setup The Initialize feature available through the UTILITY menu presets all instrument controls and functions to known val ues Initializing the instrument at the beginning of a step eliminates the possibility of settings from previous procedures causing erroneous or con fusing results Menu Selections and Measurement Techniques Details on measurement techniques and instructions for making menu selections are generally not included in this manual Comprehensive de scriptions of menus and instrument features are located in the User Manual for your instrument and in the SD 32 Sampling Head User Manual Checks and Adjustments SD 32 Se
31. el Select button Step 6 Press the UTILITY button and touch Enhanced Accuracy 11801A B and CSA 803 Series or press the ENHANCED ACCURACY button 11801 2 L Step 7 Touch Loop Gain the channel number to be calibrated and then Automatic Calibrate in the Loop Gain Calibration pop up menu L Step 8 Touch Proceed and then Store Constants in the Loop Gain Calibration pop up menu L Step 9 Disconnect the 12 inch RF cable from the sampling head Leave the 2 4 mm SMA adapter in place at the sampling head 0 Step 10 Touch Offset Null in the Enhanced Accuracy menu and then Automatic Calibrate in the Offset Nulling pop up menu 0 Step 11 Connect a 50 Q termination to the sampling head input 0 Step 12 Touch Proceed and then Store Constants in the Offset Nul ling pop up menu 0 Step 13 Touch Exit and then disconnect the 50 Q termination and the adapter from the sampling head input Measuring System Response 0 Hz 40 GHz 0 Step 14 Connect the 0 Hz 40 GHz Signal Source through the adapter and 10 dB attenuator to the sampling head input as shown in the setup illustration on page 2 37 L Step 15 On the instrument set the Main Size to 10 ns div and the Vert Size to 50 mV div L Step 16 Press the UTILITY button then select Instr Options in the major menu area on the 11801A B and CSA 803 Series first press Page to Utility Menu if necessary and set Vectored Traces to Off in the pop up menu Checks and Adj
32. en set the top knob for 9096 intensity 0 Step 14 Touch Exit 0 Step 15 Touch Cursors on the top of the screen 0 Step 16 Touch Cursor Type and then Horizontal Bars in the Cursor Type pop up menu 0 Step 17 Touch Exit Step 18 Touch the Cursor 1 selector near the top knob and then touch Fine in the pop up menu 0 Step 19 Set Cursor 1 top knob to the average of the bottom of the pulse before the step 0 Step 20 Set Cursor 2 bottom knob to the top of the step L Step 21 Read AV as the peak to peak step amplitude and then record this value as V for later use 0 Step 22 Press the UTILITY button and touch Enhanced Accuracy 11801A B and CSA 803 Series or press the ENHANCED ACCURACY button 11801 2 0 Step 23 Touch Loop Gain and set the Divide by Two Mode to On in the Loop Gain Calibration pop up menu 0 Step 24 Touch Cursors at the top of the screen L Step 25 Set Cursor 1 to the average of the bottom of the pulse before the step 0 Step 26 Set Cursor 2 to the average of the bottom of the pulse under the step 0 Step 27 Read AV and then record this value as VL for later use 0 Step 28 Set Cursor 2 to the average of the top of the pulse Step 29 Read AV and then record this value as VH for later use C Step 30 Check that the negative dot response error VL VH x 100 is within 5 L Step 31 Check that the positive dot response error 100 x VH V V VU is within 5
33. esult in the Adapter Correction Factor columns of Tables 2 11 2 12 and 2 13 See Table 2 4 for example entries 1 2 522 x P x 22 S22 x P 52117 Adapter Correction Factor 0 Step 2 Enter the power sensor cal factors printed on the Power Sen sor into Tables 2 12 and 2 13 SD 32 Service Manual 2 31 Checks and Adjustments Table 2 4 Calculation of Adapter Correction Example Values Power Sensor Adapter Scattering Reflection Parameters Coefficient 22 21 p or Rho Adapter Frequency Mag Phase Mag Mag Phase Correction Example 22 22 21 0 Factor 20GHz 0 0024 86 4 0 968 0447 1752 1 067 45 GHz 0 0026 124 3 0 944 0 083 111 3 1 122 50 GHz 0 0025 171 9 0 925 0 111 168 4 1 168 1 Information supplied with adapter Fixed values as supplied by Instrument vendor 0 Step 3 Connect the Power Sensor to the Power Ref connector on the Power Meter L Step 4 Press the Zero key and wait for the zeroing routine to finish 0 Step 5 Press the Cal Shifted Zero key and then key in the Ref Cal Factor of the Power Sensor printed on the Power Sensor using the Data Entry arrow keys L Step 6 Press the Enter key and verify that the Power Meter displays the message CAL The Power Meter is now calibrated to accurately perform power measurements L Step 7 Press the Cal Fac button Shift Freq then key in 10096 and then press Enter 0 Step 8 Press
34. hecks and Adjustments SD 32 Service Manual Checks and Adjustments Setup to Measure the System Frequency Response 0 Hz 40 GHz 11801B dh 5 500 4 Termination a 3 2 4 mm SMA Adapter Furnished L Trigger Input 12 RF Cable Sampling Head 34 Extender BNC SMA Adapter 42 RF Cable Sampling Head REF OUT Back Signal Source M 10 dB Attenuator E bas sc L L uw ais E KM VM Adapter LLL LW EE a O ccce 6000 CSA 803A 5 500 Termination 2 4 mm SMA Adapter Furnished n LLLLLL Trigger Input 12 RF Cable rh Sampling Head Extender BNC SMA Adapter 42 RF Cable Sampling Head REF OUT I Back Signal Source I 10 dB ET E eg ewe E me E KM VM Adapter cs ic Lr NE Ep Q tLe OOOO 2 37 Checks and Adjustments 2 38 0 Step 1 Connect the Signal Source 10 MHz Ref Output to the instru ment TRIGGER INPUT through a 42 inch RF cable and BNC SMA adapter 0 Step 2 Connect the instrument CALIBRATOR output to the sampling head input through a 12 inch RF cable and the furnished 2 4 mm SMA adapter L Step 3 Touch Initialize in the UTILITY major menu to reset the instru ment to the default configuration 0 Step 4 Press the TRIGGER button then touch the Source in the main menu area and select Internal Clock in the Trigger Source pop up menu On the CSA 803 Series press Exit 0 Step 5 On the sampling head press the Chann
35. ic Entry amp Knob Res pop up menu Step 11 Set Vert Offset M1 so that the average of the top of the pulse from 100 ns after the step to the right edge of the screen is at the hori zontal centerline Step 12 Examine that the magnitude of the maximum positive and negative aberrations that occur 100 ns after the step is lt 0 75 vertical divisions from the horizontal centerline 0 696 of the step amplitude Step 13 Touch the horizontal icon and then set the Main Size to 10 ns div Step 14 Set the Main Pos so that the rising edge of the step is at the left most edge of the screen 2 25 Checks and Adjustments 2 26 O OO Step 15 Examine that the magnitude of the maximum positive and negative aberrations that occur between 3 ns and 100 ns after the step is lt 1 5 vertical divisions from the horizontal centerline 1 2 of the step amplitude Step 16 Set the Main Size to 500 ps div and then the Main Pos so that the rising edge of the step is at the left most edge of the screen Step 17 Touch the vertical icon and then set the Vert Size to 5 mV div Step 18 Examine that the magnitude of the maximum positive aberra tion that occurs between 300 ps and 3 ns after the step is lt 3 25 vertical divisions from the horizontal centerline 6 5 of the step amplitude Step 19 Examine that the magnitude of the maximum negative aberra tion that occurs between 300 ps an
36. ller 0 Step 7 Set the Baud Rate to 4800 Bd the Parity to none and the C Step 9 On the PC type a and then press the return or enter key L Step 10 Type id and then press the return or enter key The PC then displays the following message Make sure 11800 RS232 port is set up as follows Baud Rate 4800 Parity none Stop bits 1 Enter mainframe head number 1 4 NOTE When entering the sampling head number the 11802 Oscilloscope and CSA 803 Series Communications Signal Analyzers have only head number 1 and head number 2 The 11801 Series Oscillo scopes have head number 1 through head number 4 The head numbers correspond to the sampling head compartments and are in ascending order reading from left to right SD 32 Service Manual 3 7 Maintenance L Step 11 To Enter the sampling head number type in the correct sam pling head number and then press the return or enter key The PC then displays the following message Current ID number is Enter new ID number 8 characters max NOTE The X s between the quotes represent the current ID number Eight is the maximum number of digits allowed and one is the minimum Any character is allowed except a space character L Step 12 Enter one to eight characters for the new identification number The instrument will then flash the message Change in channel M x configuration four times at the top of the screen Step 13 Set the
37. lowing information on the tag m Name and address of the instrument and sampling head owner m Name ofa person at your firm who can be contacted about the instru ment and sampling head m Complete instrument and sampling head type and serial number m A description of the service required Package the sampling head as follows if the original package is not avail able or is not fit for use L Step 1 Attach a short circuit termination to the sampling head input 0 Step 2 Obtain a corrugated cardboard carton with inside dimensions at least six inches 15 cm greater than the sampling head dimensions Use a carton with a bursting test strength of at least 200 pounds per square inch L Step 3 Fully wrap the sampling head with anti static sheeting or its equivalent to protect the finish L Step 4 Tightly pack dunnage or urethane foam between the carton and the sampling head to cushion the sampling head on all sides Allow three inches of packing on each side L Step 5 Seal the carton with shipping tape or with industrial staples 0 Step 6 Mark the address of the Tektronix service center and your return address on the carton in one or more prominent places General Information Operating Environment SD 32 Service Manual General Information The following environmental requirements are provided to ensure proper operation and long sampling head life Operating Temperature Operate the sampling head where the
38. m this procedure within the ambient temperature range of 18 C to 28 C Setup to Power On 11801B E Sampling a Head d not installed yet CSA 803A Sn Sampling E Head not installed yet Procedure to Power On 0 Step 1 Set the following in the order listed Sampling Head Not installed yet Instrument Mainframe ON STANDBY switch STANDBY 0 Step 2 Install the SD 32 sampling head the left sampling head compartment 0 Step 3 With the instrument s rear panel PRINCIPAL POWER SWITCH set to OFF connect the instrument to a suitable power source L Step 4 Set the rear panel PRINCIPAL POWER SWITCH to ON and then the instrument s front panel ON STANDBY switch to ON When the instrument is first installed the rear panel PRINCIPAL POWER SWITCH should be set to and remain in the ON position Then use the front panel ON STANDBY switch to perform all subsequent power switching Checks and Adjustments 2 10 L Step 5 Power on the following test equipment so that it is warmed up with the instrument to be tested For a complete list of test equipment see Table 2 2 Calibration generator Calibration step generator Frequency synthesizer Sweep generator Power meter Time mark generator Pulse generator Checks and Adjustments Checks and Adjustments Procedure 2 ae and lists the steps to VR vis i sient response The dot transient response is examined
39. ments SD 32 Service Manual Checks and Adjustments Table 2 2 Test Equipment Cont Description Minimum Examples of Applicable Specification Test Equipment 500 Impedance 50 Q SMA Tektronix Part 015 1022 00 Termination male connector SMA connector 500 Impedance 50 BNC Tektronix Part 011 0049 01 Termination connectors BNC connectors Short Circuit Male SMA connector Tektronix Part 015 1020 00 Termination furnished with SD 32 RF Cables 42 RG58 BNC Tektronix Part 012 0057 01 8 required connectors Wrist Strap Tektronix Part 006 3415 01 Static Control Tektronix Part 006 3414 00 Mat Needle nose pliers Pozidriv Screw P1 tip driver Torque wrench 5 16 5 8 in Ib Allen wrench 3 32 The 2 4 mm connector on the SD 32 will mate with either 2 4 mm or type V connectors Types K and SMA also can be interconnected Checks and Adjustments Using These Procedures Each procedure begins with a setup illustration that shows the test eguip ment and how to connect it Refer to Table 2 2 for examples of the test equipment for each procedure Conventions in this Manual In these procedures the following conventions are used m CAPITAL letters within the body of text identify front panel controls indicators and connectors for example MEASURE on the instrument and sampling head m Bold letters identify menu labels and display messages m Initial Capital letters identify conn
40. mm Power Only Sampling Head Compartments Figure 1 1 Sampling Head Compartments in an 11801B and a CSA 803A General Information General Information With the ON STANDBY switch set to STANDBY place the sampling head in a compartment and slowly push it in with firm pressure Once the sampling head is seated turn the lock down screw to tighten the sampling head in place See Figure 1 2 If the green indicator light remains on when the STANDBY position is selected then the switch has been left internally disabled after the servicing of the power supply To enable the ON STANDBY switch refer to the Maintenance section of your instrument s Ser vice Manual To avoid damage to the instrument set the instrument s ON STANDBY switch to STANDBY before installing or removing a sampling head To remove the sampling head from an instrument set the instrument s ON STANDBY to STANDBY Turn the lock down screw to loosen the sam pling head and then slowly pull out the sampling head Mainframe Lock Down Screw Sampling Head Figure 1 2 Installing a Sampling Head in an Instrument SD 32 Service Manual 1 5 General Information Packaging for Shipment If possible save and reuse the original carton and packaging to package sampling head when shipping it by commercial transportation Attach a tag to the sampling head if it is shipped to your local Tektronix service center for service or repair Include the fol
41. ng Head Signal Source L 10 dB Attenuator L E WR 19 to VM L Adapter L External RF Output Support Input 2 41 Checks and Adjustments Measuring System Response 40 GHz 50 GHz 0 Step 35 Connect the 40 GHz 50 GHz Signal Source through the waveguide coupler adapter and 10 dB attenuator to the sampling head input as shown in the setup illustration 0 Step 36 Repeat Steps 30 through 33 for each frequency listed Table 2 15 Measuring System Noise 0 Step 37 Disconnect the Signal Source from the sampling head input and connect the 2 4 mm SMA adapter and the 50 O termination to the sampling head input NOTE Do not change the vertical size for the following measurement L Step 38 Repeat steps 31 through 33 and record the AV value in the Measured Noise column of Tables 2 14 and 2 15 for all frequencies greater than 5 GHz Calculating the Sampling Head Frequency Response In this last part of the procedure the frequency characterization is calculated using the results from the first two parts 0 Step 1 Subtract the Measured Noise value Tables 2 14 and 2 15 from the Measured Amplitude value Tables 2 14 and 2 15 for each frequen cy Record these values in the Corrected Amplitude column of Table 2 14 0 Hz 40 GHz and Table 2 15 40 GHz 50 GHz Convert the Corrected Amplitude values to power values in dBm as follows L Step 2 Determine the Calculated System Power for each frequency listed in Table 2
42. ng set tings in the order listed Sampling Head CH 1 SELECT CHANNEL On Instrument Mainframe ENHANCED ACCURACY button 11801 2 press UTILITY button 11801A B CSA 803 Series press Enhanced Accuracy 11801A B CSA 803 Series touch Calibrate All pop up menu Recall Defaults TRIGGER button press DIO PO vei eee BE A Ad A AE Main Size Cia ian hea acha uet euasit 5 Hs div Calibration Generator Amplitude c eee ERES maximum amplitude Web uias 10 us Variable adjustment mid range L Step 2 Touch the vertical 1 icon and then set the Vert Offset M1 so that the waveform is vertically centered on the screen L Step 3 Set the calibration generator s amplitude so that it displays 1 V peak to peak square wave 0 Step 4 Touch the horizontal icon and then set the Main Size to 500 ns div 0 Step 5 Set the Main Pos so that the positive going step is within 1 2 division to the right of the left most edge of the screen 0 Step 6 Press the WAVEFORM button L Step 7 Touch Acquire Desc and then set Average N to On in the Acquire Description pop up menu L Step 8 Touch Set Avg and then set Average to 128 with the top knob L Step 9 Touch the vertical 1 icon and then set the Vert Offset M1 so that the
43. nual Checks and Adjustments Procedure to Examine Acquisition Aberrations L Step 1 Initialize the instrument settings then make the following set tings in the order listed Sampling Head CH1 SELECT CHANNEL On Off On Instrument Mainframe ENHANCED ACCURACY button 11801 2 press UTILITY button 11801A B CSA 803 Series press Enhanced Accuracy 11801A B CSA 803 Series touch Calibrate All pop up menu Recall Defaults TRIGGER button press So trCe oi SU ee Ae Se Internal Clock Calibration Step Generator ON STANDBY switch ON 0 Step 2 Press the WAVEFORM button and then touch Acquire Desc 0 Step 3 Set Average N to On and then touch Set Avg Step 4 Set Average N to 128 with the top Step 5 Press the AUTOSET button Step 6 Touch the horizontal lt gt icon and then set the Main Size to 100 ns div Step 7 Setthe Main Pos so that the rising edge of the step is at the left most edge of the screen Step 8 Touch the vertical 1 icon and then set the Vert Offset M1 so that the average of the top of the pulse between 100 ns after the step and the right edge of the screen is at the horizontal centerline Step 9 Set the Vert Size M1 to 2 mV div Step 10 Touch Vert Offset M1 and then Fine in the Numer
44. om the Power Meter and then record this value in the Measured Power column of Table 2 13 located on page 2 45 for later use Refer to Table 2 6 for example entries Table 2 6 Signal Source Response 40 GHz 50 GHz Example Values Frequency Measured Power Adapter Corrected GHz Amplitude Sensor Correction Power mV Cal Factor Factor dBm 40 GHz 10 01 0 935 1 092 9 34 45 GHz 10 10 0 895 1 122 9 12 50 GHz 9 27 0 863 1 168 8 79 L Step 26 Enter the next frequency listed in Table 2 13 into the Signal Source by entering the frequency in GHz on the keypad then press the GHz button L Step 27 Repeat steps 25 and 26 for each frequency listed in Table 2 13 Calculation of Corrected Power All Frequencies 0 Step 28 After all power measurements have been made use the following formula to determine the corrected power for each frequency in Tables 2 12 and 2 13 Corrected Power Measured Power 10log Power Sensor Cal Factor 10log AdapterCorrection Factor Record these values in the Corrected Power columns of Tables 2 12 and 2 13 for later use Measuring the System Frequency Response To begin the second part of this procedure set up the Mainframe and sam pling head as shown in the figure below Prior to performing any measure ment you must warm up the instrument This requires that the PRINCIPAL POWER SWITCH and ON STANDBY switch of the instrument be set to ON for twenty minutes 2 36 C
45. on Pulse Generator Back Terminator button pull out eo each dee ee pee Peed Water exit REA External Trigger Duration dee bmi Shee ie square wave Examine dot response at 250 mV with automatic calibration set tings by performing Steps 2 through 31 0 Step 2 Set the pulse generator s amplitude for a level of 375 mV peak peak observed on the instrument screen 0 Step 3 Set the Vert Offset MI so that the step is approximately cen tered on the screen 0 Step 4 Press the UTILITY button and touch Enhanced Accuracy 11801A B and CSA 803 Series or press the ENHANCED ACCURACY button 11801 2 0 Step 5 Touch Loop Gain and then the channel number you are using Step 6 Touch Automatic Calibrate Ignore message at top of screen regarding connection of calibrator output Then touch Proceed 0 Step 7 Touch Exit 0 Step 8 Set the pulse generator s amplitude for a 250 mV peak peak display Step 9 Press the WAVEFORM button and then touch Horizontal Desc L Step 10 Touch Main Record Length in the Horizontal Description pop up menu and then set the top knob for a Main Record Length of 512 0 Step 11 Press the UTILITY button and then Instr Options Checks and Adjustments Checks and Adjustments L Step 12 Set Vectored Trace to Off in the Instrument Options pop up menu 0 Step 13 Touch Display Intensity in the Instrument Options pop up menu and th
46. or CSA 803 Series Communications Signal Analyzer Pulse Generator Time Mark Generator Calibration Generator Calibration Step Generator Frequency Synthesizer Sweep Generator Waveguide Coupler Waveguide Detector Table 2 2 Test Equipment Minimum Specification Tektronix digital sampling oscilloscope 1 ns rise time 5 V output 10 Hz to 250 MHz frequency range 1 ns through 5 s markers in a 1 2 5 sequence at least 5 parts in 107 accuracy DC output 0 596 accuracy 1 V output amplitude 50 MHz to 40 GHz Output adjustable to 2 dBm with LF reference output 40 GHz to 50 GHz Output adjustable to 0 dBm WR 19 10 dB WR 19 40 50 GHz Examples of Applicable Test Equipment Tektronix 11801 A B 11802 Digital Sampling Oscilloscope Tektronix CSA 803 CSA 803A Communications Signal Analyzer Tektronix PG 502 Pulse Generator with a TM 500 Series Power Module Tektronix TG 501A Time Mark Generator with a TM 500 Series Power Module Tektronix PG 506A Calibration Generator with a TM 500 Series Power Module Tektronix 067 1338 0X Calibration Step Generator where X represents either a 0 1 2 3 5 or 6 depending on the power supply appropri ate for your country Refer to Section 5 Replaceable Parts Wiltron 6769B Wiltron 6672B Aerowave 19 3000 10 Pacific Millimeter Products Model UD Checks and Adjustments 2 4 Description System Controller Po
47. or through resis tance of 100 Q 1 100 to 500 V 6 600 to 800 V 2 200 to 500 V 7 400 to 1000 V est 3 250 V 8 900 V 4 500 V 9 1200 V 5 400 to 600 V 3 3 Maintenance Exchanging Sampling Heads If a sampling head fails any of the parts in Section 2 Checks and Adjust ments then it may be exchanged for a new sampling head Sampling head exchanges can be made with either your local Tektronix service center or the Central Tektronix Exchange Center in Beaverton Oregon For more information on exchanging your sampling head refer to Module Exchange in Section 5 Replaceable Parts Removing and Replacing the Sampling Head Internal Circuitry To avoid damage to the sampling head set the instrument ON STANDBY switch to STANDBY and remove the sampling head from the instrument before removing or replacing the internal circuitry Perform the following procedures to remove and replace the internal circuitry in the sampling head Step 1 Remove the SELECT CHANNEL On Off button by gently pulling on the plastic knob with small needle nose pliers Step 2 Remove the small Pozidriv screws on each side of the sampling head casing as shown in Figure 3 1 Step 3 Remove the short circuit termination and adapter then the front panel and the casing from the internal circuitry Step 4 Install the internal circuitry into the gray shipping casing Step 5 Replace the adapter and short circuit termination on
48. racy 11801A B CSA 803 Series touch Calibrate All pop up menu Recall Defaults L Step 2 Touch Loop Gain in the Enhanced Accuracy menu Step 3 Disconnect the 50 termination from the CH 1 input and con nect the CALIBRATOR to the CH 1 input through the 12 inch RF cable L Step 4 Touch the channel number you are using Automatic Calibrate and then Proceed in the Loop Gain Calibration pop up menu 0 Step 5 Disconnect the CALIBRATOR from the CH 1 input and recon nect the 50 termination 0 Step 6 Press the WAVEFORM button and then touch Acquire Desc 0 Step 7 Set Average to On 0 Step 8 Press the AUTOSET button L Step 9 Touch the vertical 1 icon Set the Vert Size M1 to 2 mV div 0 Step 10 Touch Def Tra at the top of the screen L Step 11 In the Vertical Description pop up menu touch the following selectors in the order given Mainframe 77807 Series only 1 Avg Mainframe 11801 Series only 1 Enter Desc 0 Step 12 Press the MEASURE button and then touch Measurements 0 Step 13 Touch RMS in the Measurements pop up menu and then RMS in the MEASURE major menu C Step 14 Set Data Interval to whole zone in the RMS pop up menu 0 Step 15 Examine that RMS is less than 2 3 mV 0 Step 16 Press the WAVEFORM button SD 32 Service Manual 2 21 Checks and Adjustments L Step 17 Touch Sampling Head Fnc s and then set Smoothing to On in the Sampling Hea
49. reakdown and may improve reliability of the instrument or sampling head The severity of the environment to which the sampling head is subjected determines the frequency of maintenance Exterior Loose dust accumulated on the outside of the instrument or sampling head can be removed with a soft cloth or small brush The brush is particularly useful for dislodging dirt in and around the sampling head connector and front panel switches Periodic Electrical Checks To ensure accurate measurements perform periodic electrical checks on the instrument and sampling head after each 2 000 hours of operation or every 24 months if used infrequently Procedures to perform periodic electrical checks are given in Section 2 Checks and Adjustments Maintenance Static Sensitive Device Classification j 9 Static discharge can damage any semiconductor component in the instrument or sampling head To prevent damage from electrostatic discharge follow all precautions listed in this section The instrument and sampling head contain electrical components that are susceptible to damage from static discharge Table 3 1 gives relative sus ceptibility of various classes of semiconductors Static voltages of 1 kV to 30 kV are common in unprotected environments Observe the following precautions to avoid damage L Step 1 Minimize handling of static sensitive components L Step 2 Transport the sampling heads in their original containers
50. requencies up to 5 GHz of Table 2 14 Table 2 7 System Response 0 Hz 40 GHz Example Values Frequency Measured Measured Corrected Calculated GHz Amplitude Noise Amplitude System Power mV mV mV dBm 0 05 GHz 251 9 1 7 250 2 8 05 10 GHz 260 0 1 7 258 3 7 78 20 GHz 260 0 1 7 267 9 7 46 30 GHz 270 2 1 7 268 5 7 44 40 GHz 267 4 1 7 265 7 7 53 SD 32 Service Manual 2 39 Checks and Adjustments L Step 24 Reconnect the Signal Source to the sampling head input 0 Step 25 On the instrument set the Main Size to 100 ps div Touch the Cursors icon then touch Cursor Type in the major menu and select Horizontal Bars from the pop up menu 0 Step 26 Touch the Cursor 1 label near the upper knob and then touch Fine in the pop up menu Step 27 Press the TRIGGER button and then touch Source in the major menu area Select Internal Clock from the pop up menu L Step 28 Press the WAVEFORM button then touch Acquire Desc in the major menu and select Set Env N in the pop up menu Set Envelope N to 64 using the lower knob L Step 29 Touch Acquire Desc in the major menu and touch Enve lope N in the pop up menu to turn Envelope N on Note that Aver age N is now off Step 30 Set the Signal Source to the next frequency Table 2 14 0 Hz 40 GHz or Table 2 15 40 GHz 50 GHz O Step 31 For the second and subsequent times you repeat this proce dure press the WAVEFORM bu
51. ress Enhanced Accuracy 11801A B CSA 803 Series touch Calibrate All pop up menu Recall Defaults Time Mark Generator Marker Sec iiu Heigl epee el bel riu rive 6s 0 2 us 0 Step 2 Press the TRIGGER button and then touch Level 0 Step 3 Set the Trig Level until a trace appears 2 18 Checks and Adjustments SD 32 Service Manual Checks and Adjustments L Step 4 Touch the vertical 1 icon and then set the Vert Size M1 to 2 mV div 0 Step 5 Set Vert Offset M1 so that the trace is vertically centered on the screen L Step 6 Set the time mark generator s marker setting to 10 ms 0 Step 7 Press the WAVEFORM button and then touch Acquire Desc 0 Step 8 Set Average to On and then touch Set Avg 0 Step 9 Set Average to 8 with the top knob 0 Step 10 Wait until the Acquire Desc selector in the WAVEFORM major menu shows that eight averages have been completed 0 Step 11 Press the MEASURE button 0 Step 12 Touch Measurements and then Mean in the Measurements pop up menu 0 Step 13 Touch Compare amp References in the MEASURE major menu 0 Step 14 Touch Save Current Meas Values as References and then set Compare to On L Step 15 Setthe time mark generator s marker setting to 5 ms 0 Step 16 Press the WAVEFORM button Touch Remove Clr Trace 1 in the major menu area then press Clear Trace 1 in the pop up menu to restart averaging 0 Step 17 Wait until the Acquir
52. rvice Manual Checks and Adjustments Setup Illustrations You can use any of the 11800 Series Digital Sampling Oscilloscopes or the CSA 803 Series Communications Signal Analyzers as the mainframe instru ment in these procedures A Mainframe Instrument is shown in each procedure the exact location of connectors on your mainframe instrument may differ from that shown in the illustration In particular the 11802 Oscilloscope and CSA 803 Series Communications Signal Analyzers have only two sampling head compartments as compared to four in the 11801 Series Oscilloscopes Locations of controls and connec tors on each instrument are shown in Figure 2 1 2 7 Checks and Adjustments 11801 mmm Left Sampling Head Compartment COR LI LI Es eg Calibrator Output Trigger Input Internal Clock Output 11802 am Left Sampling Head Compartment e Calibrator Output Trigger Input Internal Clock Output 11801A and 11801B Left Sampling Head Compartment Joje rue Calibrator Output Antistatic Connection Trigger Input Internal Clock Output CSA 803 and CSA 803A Left Sampling Head Compartment L 99 EIC Calibrator Output Antistatic Connection Trigger Inputs Internal Clock Output L mum Figure 2 1 Locations of Controls and Connectors on Mainframe Instruments 2 8 Checks and Adjustments Procedure 1 Power On SD 32 Service Manual Checks and Adjustments Perfor
53. s x 1 0 vertical divisions from the horizontal centerline 4 of the step amplitude Checks and Adjustments Checks and Adjustments 0 Step 31 Set the Main Size to 50 ps div and then the Main Pos so that the rising edge of the step is at the right most edge of the screen L Step 32 Examine that the magnitude of the maximum positive and negative aberrations that occur between 500 ps and 20 ps before the 10 point of the step is lt 1 0 vertical divisions from the horizontal centerline 4 of the step amplitude SD 32 Service Manual 2 27 Checks and Adjustments This procedure shows the setup and lists the steps to examine the maxi Procedure 6 mum signal voltage Maximum Signal Voltage Measurement Limit The measurement limit for the maximum signal voltage is 196 of the step amplitude Setup to Examine Maximum Signal Voltage 2 4mm SMA Adapter SMA BNC Adapter 11801B 1 2 Tu 3 A s ki Trigger Calibration I Generar Output Trigger Input Fast Rise Positive Output SMA BNC Adapter 50 O Coaxial Cable 2 4mm SMA Adapter SMA BNC Adapter Cs Trigger mn Calibration CSA 803A Trigger Input Fast Rise Positive Output SMA BNC Adapter 50 Q Coaxial Cable 2 28 Checks and Adjustments SD 32 Service Manual Checks and Adjustments Procedure to Examine Maximum Signal Voltage L Step 1 Initialize the instrument settings then make the followi
54. signal is a part of the strobe signal returned to the instru ment The instrument monitors the time duration of the strobe drive strobe sense loop and adjusts a delay inside the instrument to maintain correct strobe timing The following two sub sections describe how the two sampling head param eter adjustments Loop Gain and Offset Null affect sampling head performance Theory of Operation Loop Gain Loop gain determines the sampling head s ability to accurately follow an input voltage change that occurs between two adjacent samples The accuracy with which the sampling head output follows the input signal is termed the dot transient response When loop gain is unity 1 the value of the first sample acquired after an input voltage change accurately reflects the voltage change indicating a good dot transient response see Figure 4 2 If loop gain is adjusted too low then the value of the first sample acquired after an input voltage change will be between the value of the last sample and the new voltage If loop gain is adjusted too high then the value of the first sample acquired after the input voltage change will be greater than the new voltage level Figure 4 2 shows the displayed trace results for the three loop gain conditions Unity Loop Gain Insufficient Loop Gain Excessive Loop Gain Figure 4 2 Displayed Traces at Various Loop Gain Settings Theory of Operation Offset Null SD 32 Service Manual Theory
55. surement Limits and Specifications Part and Description Measurement Specification Functional Limit Test Procedure 1 Power On none none yes Procedure 2 Dot Transient Response 250 mV with automatic s 596 error yes calibration 500 mV with automatic x 596 error no calibration 500 mV with default 20 error no settings Procedure 3 Offset Offset 2 mV yes Offset change with 5 no repetition rate Procedure 4 Noise Smoothing Off 2 3 MVRMS yes Smoothing On lt 1 MVRMS yes SD 32 Service Manual 2 1 Checks and Adjustments Table 2 1 Measurement Limits and Specifications Cont Part and Description Measurement Specification Functional Limit Test Procedure 5 Acquisition no Aberrations with 067 1338 0X source 0 to 300 ps 14 to 796 300 ps to 3 ns 6 596 4 2 ns to 100 ns 1 2 100 0 6 10 ns to 20 ps 4 Procedure 6 Maximum 1 Aberrations no Signal Voltage for a 1 V Step Amplitude Procedure 7 Bandwidth 50 GHz 3 dB no Checks and Adjustments Test Equipment SD 32 Service Manual Checks and Adjustments Table 2 2 lists test equipment suggested for use with this manual Procedure steps are based on the test equipment examples given but other equipment with similar specifications may be substituted Test results setup informa tion and related connectors and adapters may be altered by the use of different equipment Description 11800 Series Oscilloscope
56. ted GHz Power Cal Factor Correction Power dBm Factor dBm 40 GHz 45 GHz 50 GHz Table 2 14 System Response 0 Hz 40 GHz Frequency Measured Measured Corrected Calculated GHz Amplitude Noise Amplitude System Power mV mV mV dBm 0 05 GHz 10 GHz 20 GHz 30 GHz 40 GHz SD 32 Service Manual 2 45 Checks and Adjustments Table 2 15 System Response 40 GHz 50 GHz Frequency Measured Measured Corrected Calculated GHz Amplitude Noise Amplitude System Power mV mV mV dBm 40 GHz 45 GHz 50 GHz Table 2 16 Sampling Head Frequency Characterization 0 2 40 GHz Frequency Frequency Measurement Normalized Measurement GHz Response Error Frequency Limit dB dB Response dB 0 05 GHz 3 dB 10 GHz 3 dB 20 GHz 3 dB 30 GHz 3 dB 40 GHz 3 dB Table 2 17 Sampling Head Frequency Characterization 40 GHz 50 GHz Frequency Frequency Measurement Normalized Measurement GHz Response Error Frequency Limit dB dB Response dB 0 05 GHz 3 dB 40 GHz 3 dB 45 GHz 3 dB 50 GHz 3 dB 2 46 Checks and Adjustments Preventive Maintenance SD 32 Service Manual Maintenance This section contains information for performing preventive maintenance and procedures for exchanging faulty sampling heads removing and replacing sampling head internal circuitry and changing the sampling head identifica tion number Preventive maintenance performed regularly can prevent b
57. the dBm W button if required to make the Power Meter indicate measurements in dBm and then disconnect the Power Sensor from the Power Ref Connector on the Power Meter 2 32 Checks and Adjustments SD 32 Service Manual Checks and Adjustments Set up the Signal Source as shown in the following figure The RF output may be located on the rear panel of the Signal Source or on the front panel as illustrated in the figure depending on the particular instrument you are using First set up the 50 MHz 40 GHz frequency synthesizer for example the Wiltron 6769B and perform the rest of the procedure for the 50 MHz to 40 GHz frequency range Then perform the same procedure for the 40 GHz to 50 GHz frequency range using the 40 GHz 50 GHz sweep generator for example the Wiltron 6672B Setup to Measure the Output Power of the Signal Source 0 Hz 40 GHz Test 8487A 10 dB Attenuator Power Sensor Signal Source KM VM Characterized Adapter VF VF Adapter Power Meter aaaaaaoo oaoooooao 9 Steps to Measure the Output Power of the Signal Source 0 Hz 40 GHz Test 0 Step 9 Connect the Power Sensor through the 10 dB attenuator and adapters to the RF output of the Signal Source 0 Step 10 Set the Signal Source s Operate Standby switch to Operate 0 Step 11 Press the RF Level 1 button on the Signal Source enter 2 on the keypad then press the GHz dBm button to set the indicated power to 2 dBm
58. the sam pling head input Step 6 Return the internal circuitry the circuit board and attached carrier for sampling head exchange or repair 0 0 OO n rl Step 7 To replace the internal circuitry follow the removal procedures in reverse order Maintenance SD 32 Service Manual Maintenance Left Side Remove all four screws on this side Short Circuit Termination Right Side e e e Remove two Short Circuit screws on this Termination side Figure 3 1 Sampling Head Screw Locations 3 5 Maintenance Changing the Sampling Head Identification Number The following procedure allows you to change the sampling head identifica tion number to fit the requirements of your application The following equipment in addition to an 11800 Series Oscilloscope or CSA 803 Series Communications Signal Analyzer and a sampling head is necessary to perform this procedure BM PC or any other compatible PC that has MS DOS an RS 232 C serial port configured for COM1 m aserial cable Procedure to change the sampling head identification number 0 Step 1 Set the instrument s PRINCIPAL POWER SWITCH to OFF Install one of the short circuit jumpers across the two J860 pins on the A5 Time Base Controller Board These short circuit jumpers are located on several jumper pins on the A5 Time Base Controller board This board is located on the bottom of the instrument and can be accessed once the bottom panel is removed Refer to
59. to repair damage resulting from improper use or connection to incompatible equipment or c to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY OTHER WARRANTIES EXPRESSED OR IMPLIED TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE TEKTRONIX RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES Table of Contents List of Figures iii Listof T bles rl LIII ee etd MR General Information General Information 1 1 Introduction 1 1 Safety Summary 1 2 Installing and Removing the Sampling Head 1 4 Packaging for Shipment 1 6 Operating 1 7 Operating Temperature 1
60. tton and then select Acquire Desc in the major menu L Step 32 Select Envelope Complete from the Acquire Desc pop up menu When the entry in the Acquire Desc selector reads Stopped touch the Cursors icon 0 Step 33 Place Cursor 1 at the average level of the bottom of the trace Place Cursor 2 at the average level of the top of the trace and record the AV value in the Measured Amplitude column of Table 2 14 0 Hz 40 GHz or Table 2 15 40 GHz 50 GHz See Tables 2 7 and 2 8 for example values L Step 34 Repeat steps 30 through 33 for each frequency listed in Table 2 14 Table 2 8 System Response 40 GHz 50 GHz Example Values Frequency Measured Measured Corrected Calculated GHz Amplitude Noise Amplitude System Power mV mV mV dBm 40 GHz 250 3 10 0 240 3 8 41 45 GHz 236 8 10 0 226 8 8 91 50 GHz 197 2 10 0 187 2 10 57 Checks and Adjustments 2 40 SD 32 Service Manual Checks and Adjustments Setup to Measure the System Frequency Response 40 GHz 50 GHz 11801B SMA 50 Q Termination 2 4 mm SMA th Adapter Furnished mmm Sampling Head Waveguide Extender Detector Sampling Head Signal Source L 10 dB Attenuator L nad WR 19 to VM L Adapter L External RF Output Support Input CSA 803A SMA 50 Q Termination 2 4 mm SMA th Adapter Furnished LLLLLL Sampling Head Waveguide RF Cable Extender Detector SMA BNC Sampli
61. ustments Checks and Adjustments 0 Step 17 Press the TRIGGER button then select Source in the main menu area and select External External Direct on the CSA 803 Se ries in the pop up menu 0 Step 18 Press the CW Output Select button on the Signal Source Enter 50 on the keypad then press the MHz button to enter the 50 MHz reference frequency 0 Step 19 You should now see about five cycles of displayed waveform on the instrument Press the WAVEFORM button select Acquire Desc in the major menu and touch Average N to turn averaging On Then touch Set Avg N and adjust AvgN to 64 using the upper knob 0 Step 20 Press the MEASURE button select Measurements in the major menu and select Peak Peak from the pop up menu Touch Exit Menu to remove the pop up menu Record the Peak Peak value in the Measured Amplitude column of Table 2 14 on page 2 45 See Table 2 7 for example entries L Step 21 Optional Repeat Step 20 for any additional frequencies up to 5 GHz that you wish to measure setting the Signal Source to each frequency and adjusting the instrument Main Size to display several cycles 0 Step 22 Disconnect the Signal Source from the sampling head input and connect the 2 4 mm SMA adapter and the 50 O termination to the sampling head input NOTE Do not change the vertical size for the following measurement 0 Step 23 Record the Peak Peak value in the Measured Noise column 0 05 GHz row and for any additional f
62. wer Meter Power Sensor RF Cable Serial Cable Sampling Head Extender Coaxial Cable or Adapter Adapter KM to VM Adapter WR19 Waveguide to VM Adapter VF to VF Adapter Adapter SMA to BNC 4 required Adapter K or SMA F to V or 2 4 mm M 10 dB Attenuator Attenuator 5X Attenuator 2X Minimum Specification Any compatible controller with MS DOS and a serial port configured for COM1 50 GHz bandwidth 50 GHz bandwidth 12 inch SMA connectors 10 ft RS 232 C Cable Semirigid 6 inch with 2 9 mm connectors or 2 9 mm MM Adapter KM to VM WR19 Waveguide to VM VF to VF characterized Characterized FF 2 4 mm to 2 9 mm SMA male to BNC female 50 GHz bandwidth one male and one female V 14 dB attenuation 50 Q one male and one female BNC 6 dB attenuation 50 O one male and one female BNC Table 2 2 Test Equipment Cont Examples of Applicable Test Equipment IBM compatible PC with terminal emulation software HP 437B HP 8487A Tektronix Part 174 1364 00 Tektronix Part 012 091 1 00 Tektronix Part 012 1220 00 Cable Tektronix Part 015 0564 00 Adapter Tektronix Part 015 0613 00 Wiltron 34VK50 Wiltron 35WR19V Wiltron SC4193 Tektronix Part 015 0615 00 Tektronix Part 015 0554 00 Tektronix Part 011 0157 00 furnished with SD 32 Wiltron 41V 10 Tektronix Part 011 0060 02 Tektronix Part 011 0069 02 Checks and Adjust

Service Manual SD-32 Sampling Head 070–8269–01

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Service Manual SD-32 Sampling Head 070&ndash;8269&ndash;01

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Service Manual SD-32 Sampling Head 070–8269–01