P62481.7 GHz (Typical) Differential Probe Service Manual
Contents
1. Set the synthesizer to 500 MHz and 0 dBm Set the spectrum analyzer center frequency to 500 MHz Repeat steps 10 through 16 Set the synthesizer to 1 GHz and 0 dBm Set the spectrum analyzer center frequency to 1 GHz NOTE Carefully dress the probe cable so that it does not cross itself or pass near the BNC to probe tip adapter Improperly dressing the probe cable can affect the measurements at 1 GHz and above 22 Repeat steps 10 through 16 Table 9 CMRR and measured feedthrough limits 1 measured feed Frequency through through 10 measured feed P6248 1 7 GHz Differential Probe Service Manual 43 Appendix A Alternate Verification Procedures 44 P6248 1 7 GHz Differential Probe Service Manual2. 2 mV div Set the time division to 200 us div Set the trigger source to external or Channel 2 Set the acquisition mode to average 8 to 10 acquisitions Apply vertical bandwidth limiting if available to reduce noise 5 Adjust the trigger level for a stable trigger If the trigger is obtained through channel 2 it may be necessary to change the volts div setting 6 The displayed square wave is the common mode feedthrough If the probe is severely misadjusted the waveform may be off screen If necessary increase the channel 1 volts div to keep the waveform on screen 7 Adjust the 1 DC CMRR for minimum amplitude in the flat portions of the displayed waveform This adjustment does not affect the leading edge transitions Increase the vertical sensitivity as the amplitude decreases P6248 1 7 GHz Differential Probe Service Manual Adjustment Procedures AC CMRR 10 10 Change the probe to 10 attenuation Adjust the 10 DC CMRR for minimum amplitude in the flat portions of the displayed waveform This adjustment does not affect the leading edge transitions Keep the connections for the next procedure Change the function generator to sine wave Set the frequency of the function generator to 5 MHz and the output amplitude to approximately 10 V pk pk 5 V peak Set the probe to 1 attenuation Change the oscilloscope horizontal 100ns div If necessary adjust the channel 2 volts div and trigger level for a sta
3. Figure 13 Replacing TEKPROBE interface pins P6248 1 7 GHz Differential Probe Service Manual 27 Maintenance Removing and Replacing the TEKPROBE Interface Collar 1 To remove the collar firmly pull the collar off by hand 2 To replace the collar align the smaller group of pins with the smaller of the two holes in the interface collar and align the tabs with the slots Gently press the two pieces together See Figure 14 Slot Figure 14 Replacing the TEKPROBE collar 28 P6248 1 7 GHz Differential Probe Service Manual REE ae Options Option 95 is a report of the calibration data This option must be ordered at the time of purchase P6248 1 7 GHz Differential Probe Service Manual 29 Options 30 P6248 1 7 GHz Differential Probe Service Manual EEE Replaceable Parts Figure 15 P6248 replaceable parts P6248 1 7 GHz Differential Probe Service Manual 31 Replaceable Parts Replaceable parts list Fig amp index Tektronix Serialno Serial no number partnumber effective discontd Qty Name amp description Mfr code Mfr part number Probe 15 1 010 6248 00 1 PROBE DIFF ACT 1 7GHZ 80009 010 6248 00 DIFFERENTIAL CERTIFICATE OF TRACEABLE CALIBRATION STANDARD P6248 2 211 0001 00 8 SCREW MACHINE 2 56 X 0 25 PNH STL CD PL POZ 80009 ORDER BY DESCRIPTION 3 131 3627 02 1 CONTACT ELEC GOLD PLATED TIP 80009 131 3627 02 4 205 0191 01 1 SHELL ELEC CONN BNC ABS DOVE GRAY 80009 205 0191 01 32 P6248 1 7
4. 2 EACH 80009 016 1315 00 VARIOUS COLORS 14 006 7164 00 1 BOX PLASTIC 4 625 X 2 875 X 1 0 80009 006 7164 00 15 016 1879 00 1 CASE CARRYING PROBE CARRYING CASE P6248 80009 016 1879 00 071 0566 XX 1 MANUAL TECH INSTRUCTION P6248 80009 071 0566 XX 071 0573 XX 1 MANUAL TECH SERVICE P6248 80009 071 0573 XX 34 P6248 1 7 GHz Differential Probe Service Manual Replaceable Parts Figure 17 P6248 optional accessories P6248 1 7 GHz Differential Probe Service Manual 35 Replaceable Parts Replaceable parts list Fig amp index Tektronix Serial no Serial no number partnumber effective discontd Qty Name amp description Mfr code Mfr part number Optional Accessories 17 1 SMK4 1 TIP PROBE MICROCKT TEST PKG OF 4 80009 SMK4 2 003 0675 00 1 SCREWDRIVER 5 INCH 80009 003 0675 00 TOTAL PLASTIC W PLASTIC TIP ONE END METAL TIP OPPOSITE END P6055 PROBE AD 3 011 0049 01 1 TERMN COAXIAL 50 OHM 2W BNC 24931 011 0049 01 4 012 0076 00 1 CA ASSY RF COAXIAL RFD 50 OHM 20 L BNC 80009 012 0076 00 MALE STR BOTH ENDS W STRAIN RELIEF BOOT BOTH ENDS 5 1103 1 TEKTRONIX 1103 TEKPROBE POWER SUPPLY 80009 ORDER BY DESCRIPTION 6 679 5027 00 1 CKT BD SUBASSY 1394 ADAPTER 80009 679 5027 00 36 P6248 1 7 GHz Differential Probe Service Manual Replaceable Parts Manufacturers cross index Mfr code 060D9 24931 80009 Manufacturer UNITREK CORPORATION BERG ELECTRONICS INC TEKTRONIX INC Address 3000 COLUMBIA HOUSE BLVD SUITE 12
5. Figure 17 P6248 optional accessories cee eeceeceeee 35 Figure 18 Normalizing the setup 0c cee ee ccc eeceees 41 Figure 19 Setup for the CMRR tests 0c cece cere eee 42 P6248 1 7 GHz Differential Probe Service Manual HN a General Safety Summary Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it To avoid potential hazards use this product only as specified Only qualified personnel should perform service procedures To Avoid Fire or Connect and Disconnect Properly Do not connect or disconnect probes or test Personal Injury leads while they are connected to a voltage source Connect and Disconnect Properly Connect the probe output to the measurement instrument before connecting the probe to the circuit under test Disconnect the probe input and the probe ground from the circuit under test before disconnecting the probe from the measurement instrument Ground the Product This product is indirectly grounded through the grounding conductor of the mainframe power cord To avoid electric shock the grounding conductor must be connected to earth ground Before making connections to the input or output terminals of the product ensure that the product is properly grounded Observe All Terminal Ratings To avoid fire or shock hazard observe all ratings and markings on the product Consult the product manual for further ratings infor
6. Q BNC cable Female BNC to male banana adapter lt 50 Q precision terminator Figure 11 Setup for gain adjustment 2 Set the DMM monitoring the output to DC Volts 2 or 3 volt range 3 Set the DMM monitoring the input to the 2 or 3 volt range Keep averaging turned on 4 Set the probe to 1 attenuation 22 P6248 1 7 GHz Differential Probe Service Manual Adjustment Procedures 5 Adjust the power supply to output about 700 mV 6 Adjust the 1 gain adjustment until the output voltage measures the same as the input within 5 mV 7 Change the probe attenuation to 10 8 Change the DMM monitoring the input to the 20 or 30 volt range 9 Adjust the power supply to output approximately 7 V 10 Adjust the 10 gain adjustment until the DMM measuring the output reads 1 10 of the same voltage as the DMM monitoring the input within 5 mV 11 Keep the probe output connections for the next step Offset Final NOTE The offset and gain adjustments interact 1 Repeat steps 1 through 6 of the Offset preliminary procedure 2 Remove the output cable termination and input for the next procedure DC CMRR 1 Set up the equipment as shown in Figure 12 a Connect a BNC cable from the output of the 1103 to the Channel 1 input of the oscilloscope If the oscilloscope does not have 50 Q input setting add a 50 Q inline BNC terminator at the oscillosco
7. Verify that the change in the level relative to the level recorded in step 1f above is less than or equal to the 10 measured feed through column of Table 9 on page 43 These values are 20 dB lower than the specification to account for the 10 attenuation 8 Set the synthesizer to 100 MHz and 0 dBm P6248 1 7 GHz Differential Probe Service Manual Appendix A Alternate Verification Procedures 10 11 12 13 14 15 16 17 18 19 20 21 Set the reference level to 0 dBm the center frequency to 100 MHz and the vertical scale to 10 dB div Adjust the span to 200 kHz and the resolution bandwidth to auto Connect the BNC cable from the synthesizer output to the 1103 input as shown in Figure 18 Record the level displayed on the spectrum analyzer Remove the BNC cable from the 1103 input and insert the adapter and probe as shown in Figure 19 Use the CM pins of the BNC to probe tip adapter Set the probe to 1 attenuation Record the level displayed on the spectrum analyzer Verify that the change in the level relative to the level recorded in step 11 on page 43 is less than or equal to the 1 measured feedthrough column of Table 9 on page 43 Set the probe to 10 attenuation Record the level displayed on the spectrum analyzer Verify that the change in the level relative to the level recorded in step 11 on page 43 is less than or equal to the 10 measured feedthrough column of Table 9 on page 43
8. distance between the probe head and the probe control box 4 Set the reference value of the network analyzer to 0 dBm 5 Connect the probe input to the CM pins on the BNC to probe tip adapter Polarity is unimportant 6 Set the probe for 1 attenuation 7 Position the 0 dBm reference near the top of the screen 8 The network analyzer plot is common mode feedthrough the reciprocal of common mode rejection ratio CMRR can be read by inverting the sign of the magnitude that is 46 dBm common mode feedthrough equals 46 dBm CMRR 9 Measure the feedthrough magnitude at 1 MHz 100 MHz 500 MHz and 1 GHz Analyzers with marker capability can do this directly by setting the marker intercepts at 1 100 500 and 1 GHz If necessary turn on the network analyzer Average mode with 16 averages to stabilize the reading P6248 1 7 GHz Differential Probe Service Manual 15 Performance Verification 10 Verify that the feedthrough is less than the values in 1 Measured Feed through column of Table 6 Table 6 CMRR and Measured Feedthrough limits 6 Frequency feedthrough feedthrough 1 GHz lt 38 dBm 11 Change the probe attenuation to 10 12 Measure the feedthrough magnitude at 1 MHz 100 MHz 500 MHz and 1 GHz Analyzers with marker capability can do this directly by setting the marker intercepts at 1 MHz 100 MHz 500 MHz and 1 GHz 13 Actual CMRR can be calculated by subtracting 20 dB from the absolute magnit
9. in Unit weight probe only 160 g 5 4 oz Figure 3 Dimensions of probe head and compensation box Nominal Characteristics Nominal characteristics Table 4 describe guaranteed traits but the traits do not have tolerance limits Table 4 Nominal electrical characteristics Characteristic Description Input configuration Differential two inputs and with case ground Output coupling DC Attenuation settings 1and 10 Termination Terminate output into 50 amp 4 P6248 1 7 GHz Differential Probe Service Manual _ I Lee Performance Verification Equipment Required Use the following procedures to verify the warranted specifications of the P6248 Differential Probe Before beginning these procedures refer to page 18 and photocopy the test record and use it to record the performance test results The recommended calibration interval is one year These procedures test the following specifications m Output offset voltage m DC attenuation accuracy m Differential signal range m Rise time m Common mode rejection ratio Table 5 lists the equipment required to perform the performance verification procedure The types and quantities of connectors may vary depending on the specific equipment you use NOTE If you cannot obtain a network analyzer refer to Appendix A Alternate Verification Procedures on page 39 for procedures that do not require a network analyzer to perform the CMRR tests Table 5 Test equipme
10. mV Set the probe attenuation to 1 Measure and record the output voltage as Vout Calculate attenuation as Vin Vout Verify that the attenuation is in the range of 0 95 to 1 05 Remove the Y lead adapter from the probe and reverse the connection again red to black to Measure and record the output voltage as Vout Calculate the attenuation as Vin Vout Verify that the attenuation is in the range of 0 95 to 1 05 Remove all connections P6248 1 7 GHz Differential Probe Service Manual Performance Verification Rise Time This procedure verifies the probe meets rise time specifications The probe rise time is calculated from rise times obtained by measuring the test system without the probe connected and then the test system with the probe 1 Connect the test equipment as shown in Figure 6 Adjust the oscilloscope vertical sensitivity to 50 mV div Adjust the oscilloscope vertical positioning to center the signal on screen Adjust the oscilloscope horizontal sensitivity to 500 ps div Gy oy A dd Adjust the oscilloscope horizontal positioning to place the rising edge of the signal where it crosses the second vertical and center horizontal graticule lines 6 Use the oscilloscope measurement capability to display rise time Rise time is determined from the 10 and 90 amplitude points on the waveform Record the rise time as t If the measurement reading is not stable use Average mode 16 Averages to
11. probe should be on the center square pin of the probe tip adapter The test setup should now appear as shown in Figure 7 Oscilloscope BNC to SMA adapter 015 0572 00 CH1 CH 1 SD24 output input SMA cable 1103 015 0562 00 oO O OO SMA to BNC adapter 015 0572 00 BNC to probe tip adapter 679 4094 00 P6248 Figure 7 Rise time setup for test system with probe 15 Set the probe attenuation to 1 16 Adjust the oscilloscope vertical sensitivity to 50 mV div 17 Adjust the oscilloscope vertical positioning to center the signal on screen 18 Adjust the oscilloscope horizontal sensitivity to 500 ps div P6248 1 7 GHz Differential Probe Service Manual Performance Verification 19 20 21 22 23 24 25 26 27 28 29 30 Adjust the oscilloscope horizontal positioning to place the rising edge of the signal so that it crosses the second vertical and center horizontal graticule lines Use the oscilloscope measurement capability to display rise time Rise time is determined from the 10 and 90 amplitude points on the waveform Record the rise time for 1 as ban Calculate the probe rise time using the following formula 2 2 bern Ts Record the calculated probe rise time for 1 on the test record Set the probe attenuation to 10 Adjust the oscillo
12. tip accessory kit P6248 1 7 GHz Differential Probe Service Manual 39 Appendix A Alternate Verification Procedures Preparation 40 Allow all test equipment to warm up for 20 minutes in an environment that is within the environmental conditions specified in Table 1 on page 1 Prepare the equipment as follows 1 5 6 Connect the probe tip adapter to the inputs of the probe For a description of these accessories refer to the list of standard accessories on pages 33 and 34 Attach the probe to the 1103 TEKPROBE power supply If necessary set the line selector of the 1103 power supply to the correct voltage Turn on the 1103 power supply Set the 1103 offset to off button not illuminated Allow at least 20 minutes for the probe and equipment to warm up Perform the verification procedures in order P6248 1 7 GHz Differential Probe Service Manual Appendix A Alternate Verification Procedures CMRR Common Mode Rejection Ratio 1 Normalize the setup as follows a Spectrum analyzer Frequency synthesizer Connect the equipment as shown in Figure 18 CH1 CH1 18 inch BNC cable Figure 18 Normalizing the setup e f Set the synthesizer to 1 MHz and 10 dBm Adjust the spectrum analyzer input attenuator to accept the high level of 10 dBm Set the reference level to 10 dBm the center frequency to 1 MHz and the vertical scale to 10 dB div Adjust the span to 10 kHz and the
13. 0 BERG ELECTRONICS RF COAXIAL DIV 2100 EARLYWOOD DR PO BOX 547 14150 SW KARL BRAUN DR PO BOX 500 P6248 1 7 GHz Differential Probe Service Manual City state zip code VANCOUVER WA 98661 FRANKLIN IN 46131 BEAVERTON OR 97077 0001 37 Replaceable Parts 38 P6248 1 7 GHz Differential Probe Service Manual er AEE Appendix A Alternate Verification Procedures This appendix contains alternate procedures for verifying the common mode rejection ratio specifications Use these alternate procedures only if it is not feasible to obtain a network analyzer For the complete set of performance verification procedures refer to the Performance Verification section on page 5 and refer to this section when directed to do so Equipment Required Table 8 lists the equipment required to perform the procedures in this section The types and quantities of connectors may vary depending on the specific equipment you use Table 8 Test equipment Description Example product Sine wave generator pre 0 dBm to 20 dBm from 1 MHz to Fluke 6066 ferably a synthesizer 1 5 GHz Spectrum analyzer 1 MHz to 1 8 GHz dynamic range Advantest R3365A gt 100 dBm at 1 MHz TEKPROBE Power Supply Tektronix Type 1103 Tektronix Type 1103 BNC to Type N coax adapt Type N male to BNC female 103 0045 00 ers 2 BNC cables 2 50 Q 18 inch 012 0076 00 Probe tip adapters included in the standard probe tip 020 2203 00 BNC to probe
14. 011 00 Adapter 2 SMA Female to BNC male 015 0572 00 Prepare the equipment as follows 1 Connect the Y lead adapter to the inputs of the probe and the ground lead to the probe ground For a description of these accessories refer to the list of standard accessories on pages 33 and 34 2 Attach the probe to the 1103 TekProbe power supply 3 If necessary set the line selector of the 1103 power supply to the correct voltage 4 Turn on the 1103 power supply 5 Set the 1103 offset to off button not illuminated 6 Allow the probe and test equipment to warm up for 20 minutes at an ambient temperature of 20 C to 30 C 68 F to 86 F Perform the verification procedures in order P6248 1 7 GHz Differential Probe Service Manual Performance Verification Output Offset Voltage 1 Connect the probe as shown in Figure 4 CH1 CH1 output input Digital multimeter 1103 50 Q BNC cable o0 E 8 50 Q precision terminator Female BNC to male banana adapter BNC to probe tip adapter DM pair for offset test Figure 4 Setup for the output offset voltage test Set the probe to 10 attenuation Verify that the output voltage is lt 10 mV Change the probe attenuation to 1 Verify that the output voltage is lt 10 mV Su b b Keep the output connections for the next procedure DC attenuation accuracy P6248 1 7
15. DOEN a ae d bardaketa Replaceable NN EA Appendix A Alternate Verification Procedures Equipment Required Preparations 2 una CMRR Common Mode Rejection Ratio P6248 1 7 GHz Differential Probe Service Manual iii vii vii vii MO GO red GZ LA JO FNP bei Table of Contents List of Figures Figure 1 Typical Common Mode Rejection Ratio 1 and 10 attenuation 0 ccc cece ccc cee eens 3 Figure 2 Typical differential input impedance versus frequency 3 Figure 3 Dimensions of probe head and compensation box 4 Figure 4 Setup for the output offset voltage test 7 Figure 5 Setup for differential mode tests 00e0 ee 9 Figure 6 Test system rise time setup cc cece cee eees 11 Figure 7 Rise time setup for test system with probe 12 Figure 8 Setup for CMRR test ccc cece eee cere eens 15 Figure 9 Adjustment locations 00 e eee e cece rene eees 20 Figure 10 Setup for the offset adjustment c cc 21 Figure 11 Setup for gain adjustment cece eee e eee 22 Figure 12 Setup for DC CMRR and AC CMRR adjustments 24 Figure 13 Replacing TEKPROBE interface pins 27 Figure 14 Replacing the TEKPROBE collar 06 28 Figure 15 P6248 replaceable parts ass sz zr ccc ee eee ee cece 31 Figure 16 P6248 standard accessories eceeceeeeees 33
16. GHz Differential Probe Service Manual Replaceable Parts N Fw Ko 5 Ws IS 55 5 IK de Figure 16 P6248 standard accessories P6248 1 7 GHz Differential Probe Service Manual Replaceable Parts Replaceable parts list Fig amp index Tektronix Serial no Serial no number partnumber effective discontd Qty Name amp description Mfr code Mfr part number Standard Accessories 16 1 020 2328 02 1 ACCESSORY PKG P6248 80009 020 2328 02 Includes items 2 through 14 2 196 3462 00 1 ACCESSORY KIT LEAD SET GROUND AND Y LEAD 80009 196 3462 00 3 016 1783 00 1 ACCESSORY KIT GROUND CONTACTS PKG OF 10 80009 016 1783 00 131 6247 00 4 016 1782 00 1 ACCESSORY KIT SPRING LOADED GROUND 80009 016 1782 00 PINS PKG OF 6 131 6271 00 5 016 1781 00 1 ACCESSORY KIT TIP SAVER PKG OF 2 206 0489 00 80009 016 1781 00 6 016 1786 00 1 TIP PROBE PKG OF FOUR 013 0305 00 80009 016 1786 00 7 016 1780 00 1 ADAPTER LONGHORN VIA PKG OF 5 206 0490 00 80009 016 1780 00 8 016 1891 00 1 ACCESSORY KIT PROBE TIP ADAPTER STRAIGHT 060D9 016 1891 00 8 EACH 131 7143 00 9 016 1890 00 1 ACCESSORY KIT PROBE TIP ADAPTER VARITIP 060D9 016 1890 00 8 EACH 131 7142 00 10 016 1785 00 1 ADAPTER DIFFERENTIAL PROBE PKG OF FOUR 80009 016 1785 00 013 0306 00 11 206 0364 XX 4 TIP PROBE MICROCKT TEST 0 05 CTR 80009 206 0364 XX 12 679 4094 00 1 CKT BD SUBASSY PROBE TIP TO BNC ADAPTER 80009 679 4094 00 13 016 1315 00 1 MARKER KIT ID CABLE MARKER BAND
17. GHz Differential Probe Service Manual 7 Performance Verification DC Attenuation Accuracy 1 a o ea e 11 12 13 14 15 16 Connect the probe input to the Y lead adapter and then to the DC source Monitor the source voltage with the DMM Set the probe to 10 attenuation Set the input voltage on the DC source to approximately 5 V Record the actual voltage as Vin1 Record the output voltage as Voutl Set the input voltage on the DC source to approximately 1 V Record the actual voltage as Vin2 Record the output voltage as Vout2 Calculate the attenuation as follows Vinl Vin2 Voutl Vout2 Verify that the attenuation is in the range of 9 8 to 10 2 Set input voltage on the DC source to approximately 0 5 V Record the actual voltage as Vinl Change the attenuation to 1 Record the output voltage as Vourl Set input voltage on DC source to approximately 0 1 V Record the actual voltage as Vin2 Record the output voltage as Vout2 Calculate the attenuation as follows Vinl Vin2 Voutl Vout2 Verify that the attenuation is in the range of 0 98 to 1 02 Keep the output connections for the next procedure P6248 1 7 GHz Differential Probe Service Manual Performance Verification Differential Signal Range This procedure directly verifies the differential signal range and indirectly verifies the common mode signal range 1 Connect the probe as shown in Figure 5 Use the a
18. Output offset voltage 10 mV 20 to 30 C 68 to 86 F 50 mV 0 to 50 C 32 to 122 F p Rise time probe only lt 265 ps Common mode rejection ratio 45 dB at 1 MHz in 10 25 dB at 100 MHz in 10 20 dB at 500 MHz in 10 18 dB at 1 GHz in 10 60 dB at 1 MHz in 1 38 dB at 100 MHzin 1 35 dB at 500 MHz in 1 30 dB at 1 GHz in 1 Bandwidth probe only DC to 1 5 GHz 3dB Temperature Operating 0 to 50 C 32 to 86 F 0 to 60 C 32 to 122 F probe head Nonoperating 55 to 75 C 131 to 167 F P6248 1 7 GHz Differential Probe Service Manual 1 Specifications Table 1 Warranted electrical characteristics cont Characteristic Description Operating 0 90 RH tested at 30 to 50 C 68 to 122 F Nonoperating 0 90 RH tested at 30 to 60 C 68 to 140 F Humidity 1 See warning that follows WARNING To avoid a burn hazard at high ambient temperatures do not touch AN the probe with bare hands at operating temperatures above 50 C 122 F or at nonoperating temperatures above 70 C 158 F Allow sufficient time for the probe to cool before handling Typical Characteristics Typical characteristics Tables 2 and 3 describe typical but not guaranteed performance Table 2 Typical electrical characteristics Characteristic Description Differential input resistance DC coupled 200 KO 2 Common mode input resistance DC 100 KQ 2 coupl
19. Service Manual Tektronix P6248 1 7 GHz Typical Differential Probe 071 0573 03 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 all safety summaries prior to performing service LU 071057303 Copyright Tektronix Inc All rights reserved Tektronix products are covered by U S and foreign patents issued and pending Information in this publication supercedes that in all previously published material Specifications and price change privileges reserved Tektronix Inc P O Box 500 Beaverton OR 97077 TEKTRONIX TEK and TEKPROBE are registered trademarks of Tektronix Inc KlipChip TwinFoot TwinTip and VariTip are trademarks of Tektronix Inc WARRANTY Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship for a period of one 1 year from the date of shipment If a 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 packa
20. 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 General Safety Summary cc cece cece cece eee e nenne Service Safety Summary 0 cece cece cere cece eee eee Preface Gag diegia eragitea dar Sar tice e ei EE eie e AEE Related Manuals 04 Contacting Tektronix Specifications sia esta eins ates eee nein ala Warranted Characteristics Typical Characteristics Nominal Characteristics Performance Verification ccccccc ccc cccescescceeeces Equipment Required Preparation u z Output Offset Voltage DC Attenuation Accuracy Differential Signal Range Rise Time birri ceata arena Common Mode Rejection Ratio TEKPROBE Communication operational check 000000 Adjustment Procedures cc cece cece cece cece cece eeece Equipment Required Offset preliminary CIA Iata ditzute Gunea tata Offset Final DCCMRR A Maintenance cece cece cree cet c eee eee c eres seseeeesees Cleanings ur a en Replacing TEKPROBE Interface Pins Removing and Replacing the TEKPROBE Interface Collar DIO
21. ble trigger The displayed sine wave is the common mode feedthrough If the probe is severely misadjusted the waveform may be off screen Adjust the 1 AC CMRR for minimum amplitude Usually it is not possible to completely eliminate the high frequency feedthrough Change the probe to 10 attenuation Adjust the 10 AC CMRR for minimum amplitude There is some interaction between the DC and AC CMRR adjustments Repeat the DC CMRR adjustment steps 5 through 12 Remove all connections from the probe Carefully replace the top cover of the control box and the four retaining screws This completes the adjustment procedures P6248 1 7 GHz Differential Probe Service Manual 25 Adjustment Procedures 26 P6248 1 7 GHz Differential Probe Service Manual CITI A Maintenance The procedures in this section describe how to maintain and repair the P6248 difterential probe Cleaning Remove dirt with a soft cloth dampened in a mild detergent and water solution or isopropyl alcohol solution or isopropyl alcohol do not use any other solvents or abrasive N CAUTION To avoid damaging the probe use only a mild detergent and water cleaners Do not immerse the probe Replacing TEKPROBE Interface Pins 1 To remove the interface pin grasp the pin with a pair of needle nose pliers and gently pull the pin out See Figure 13 2 To replace the pin insert the new pin into the socket and press it in against a hard surface
22. dapters and patch cords as necessary to make the connections Use square pins to connect the ground lead and y lead to the power supplies Calibrated DC Calibrated DC voltage source voltage source Common Differential mode source mode source Digital multimeter Y lead adapter CH1 CH 1 output input Digital multimeter Za 50 Q BNC cable Ground lead 50 Q precision terminator Female BNC to male banana adapter Figure 5 Setup for differential mode tests 2 Set the probe to 10 attenuation 3 Set the common mode source to 7 0 V 50 mV 4 Set the differential mode source to 8 5 V 100 mV Record the actual voltage as Vin 5 Measure and record the output voltage as Vout 6 Calculate attenuation as Vin Vout P6248 1 7 GHz Differential Probe Service Manual 9 Performance Verification 10 10 11 12 13 14 15 16 17 18 19 20 21 22 Verify that the attenuation is in the range of 9 5 to 10 5 Remove the Y lead adapter from the probe and reverse the connection black to red to Measure and record the output voltage as Vout Calculate attenuation as Vin Vout Verify that the attenuation is in the range of 9 5 to 10 5 Set the differential mode source to 0 85 V 10 mV Record the actual voltage as Vin Make sure that the common mode source is still set to 7 0 V 50
23. e Verification Test record Probe Model Serial Number Temperature Date of Calibration Performance test Output offset voltage 10 setting 10 mV 20 C to 30 C Output offset voltage 1 setting 10 mV 20 C to 30 C DC attenuation accuracy 10 setting DC attenuation accuracy 1 setting Differential signal range 10 setting Attenuation Attenuation with connections reversed Differential signal range 1 setting Attenuation Attenuation with connections reversed Rise time 1 setting Rise time 10 setting Measured feedthrough verifies CMRR specifications 1 setting 1 MHz 100 MHz 500 MHz 1 GHz 10 setting 1 MHz 100 MHz 500 MHz 1 GHz 18 Certificate Number RH Technician 10 mV 10 mV 10 mV 10 mV 10 2 1 02 10 5 10 5 1 05 1 05 N A N A N A N A N A N A N A N A N A N A P6248 1 7 GHz Differential Probe Service Manual EEE a Adjustment Procedures Equipment Required These procedures are for use by qualified service personnel only Prepare the probe for adjustment as follows Remove the four screws attaching the top cover from the control box Remove the top cover Attach the probe to the 1103 TEKPROBE Power Supply If necessary set the line selector to the correct voltage Turn on the 1103 power supply Set the 1103 power supply offset to off button not illuminated BD Us AO i e JE ZE Allow at least 20 minutes for the e
24. e manual adjustment of the probe 1 Connect the probe as shown in Figure 10 CH1 CH 1 output input Digital multimeter 1103 50 Q BNC cable oO eke Female BNC to male banana adapter lt 50 Q precision terminator P6248 o Euz BNC to probe tip adapter DM pair for offset test Figure 10 Setup for the offset adjustment 2 Set the DMM to DC volts 200 mV or 300 mV range average on average 10 readings Set the probe to 1 attenuation Adjust the 1 offset adjustment for 0 mV 1 mV Change the probe attenuation to 10 Adjust the 10 offset adjustment for 0 mV 1 mV SS b d b Keep the output cable set up for the next step P6248 1 7 GHz Differential Probe Service Manual 21 Adjustment Procedures Gain 1 Set up the equipment as shown in Figure 11 a Remove the BNC to probe tip adapter from the probe input Insert the Y lead adapter into the probe tip b With square pins connect the red lead to the power supply positive terminal and the black lead to the power supply negative terminal c Connect a ground lead from the probe case ground to the negative terminal of the power supply d Connect a second DMM to a pair of banana leads from the power supply outputs Calibrated DC voltage source Digital multimeter Y lead adapter Digital multimeter 50
25. ed Differential input capacitance lt 1 pF at 1 MHz Common mode input capacitance lt 2 pF at 1 MHz Harmonic distortion lt 1 5 measured using 354 mVays or 1 0 Vp p output at 100 MHz Differential offset range 700 mV 1 range 7 V 10 range Common mode rejection ratio See Figure 1 Random noise lt 50 nV VHz at 100 MHz Input impedance See Figure 2 Pass band ripple 0 5 dB to 850 MHz deviation from a nominal slope Bandwidth probe only DC to 1 7 GHz 3dB lt 27 C 1 range DC to 1 85 GHz 3dB lt 27 C 10 range Rise time probe and oscilloscope lt 265 ps 2 P6248 1 7 GHz Differential Probe Service Manual Specifications 80 60 dB 40 1 20 10 0 0 300 M 600 M 900 M 1 2G 15G 18G 2G Frequency Hz Figure 1 Typical Common Mode Rejection Ratio 1 and 10 attenuation 100 k 10k Impedance Q 1k 100 0 250 M 500 M 750 M 1G 1 25G 1 50G 1 75G 2G Frequency Hz Figure 2 Typical differential input impedance versus frequency P6248 1 7 GHz Differential Probe Service Manual 3 Specifications Table 3 Typical mechanical characteristics Characteristic Description Dimensions input connection 0 63 mm 0 025 in square pin on 2 54 mm 0 100 in centers Dimensions control box 107 mm x 41 mm x 26 mm 4 2 in x 1 6 in x 1 0 in Dimensions probe head 78 mm x 12 mm x 9 3 mm 3 0 in x 0 47 in x 0 36 in Dimensions output cable 1 2 m 47
26. gh Voltage Insulated Earth Terminal P6248 1 7 GHz Differential Probe Service Manual SS EO Service Safety Summary Only qualified personnel should perform service procedures Read this Service Safety Summary and the General Safety Summary before performing any service procedures Do Not Service Alone Do not perform internal service or adjustments of this product unless another person capable of rendering first aid and resuscitation is present Use Care When Servicing With Power On To avoid electric shock do not touch exposed connections P6248 1 7 GHz Differential Probe Service Manual v Service Safety Summary vi P6248 1 7 GHz Differential Probe Service Manual SSS EA Preface This manual contains specifications and service information for the P6248 differential probe Related Manuals For operating information refer to the P6248 Instructions 071 0566 XX Contacting Tektronix Phone 1 800 833 9200 Address Tektronix Inc Department or name if known 14200 SW Karl Braun Drive P O Box 500 Beaverton OR 97077 USA Web site www tektronix com Sales support 1 800 833 9200 select option 1 Service support 1 800 833 9200 select option 2 Technical support Email techsupport tektronix com 1 800 833 9200 select option 3 6 00 a m 5 00 p m Pacific time This phone number is toll free in North America After office hours please leave a voice mail message Outside North America contact a Tektronix sa
27. ging 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 to repair damage resulting from improper use or connection to incompatible equipment c to repair any damage or malfunction caused by the use of non Tektronix supplies or d 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 IN LIEU OF ANY OTHER WARRANTIES EXPRESS 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
28. improve stability The system rise time f that you measured in step 6 represents the rise time of the test system without the probe The system rise time is used to calculate the probe rise time t in steps 21 and 29 BNC to SMA adapter CH1 CH1 11800 SD24 015 0572 00 output input Oscilloscope 1103 SMA cable 015 0562 00 BNC to SMA adapter 015 0572 00 SMA cable 015 0562 00 Figure 6 Test system rise time setup The following steps instruct you to assemble the test setup that includes the probe as shown in Figure 7 The system and probe rise time ts p that you measure in steps 20 and 28 is used to calculate the probe rise time t in steps 21 and 29 P6248 1 7 GHz Differential Probe Service Manual 11 Performance Verification 12 SMA Male to male adapter 015 1011 00 10 11 12 13 14 Disconnect the BNC SMA adapter from the CH 1 input of the 1103 Disconnect the SMA cable from the CH 2 input of the SD 24 Connect the probe to the 1103 power supply channel 1 input Set the offset control on channel 1 of the 1103 power supply to off Connect the SMA Male to male adapter to the CH 2 input of the SD 24 Connect the BNC SMA adapter to the SMA Male to male adapter Connect the BNC probe tip adapter to the BNC SMA adapter Connect the probe input to the DM pins on the BNC probe tip adapter Observe proper polarity the side of the
29. les office or distributor see the Tektronix web site for a list of offices P6248 1 7 GHz Differential Probe Service Manual vii Preface viii P6248 1 7 GHz Differential Probe Service Manual EEE 7 Specifications The specifications in Tables 1 through 4 apply to a P6248 differential probe installed on a Tektronix TDS 694C oscilloscope When the probe is used with another oscilloscope the oscilloscope must have an input impedance of 50 Q The probe must have a warm up period of at least 20 minutes and be in an environment that does not exceed the limits described in Table 1 Specifications for the P6248 differential probe fall into three categories warranted typical and nominal characteristics Warranted Characteristics Warranted characteristics Table 1 describe guaranteed performance within tolerance limits or certain type tested requirements Warranted characteristics that have checks in the Performance Verification section are marked with the symbol Table 1 Warranted electrical characteristics Characteristic Description DC attenuation accuracy 2 for input voltages 750 mV 1 and 7 5 V 10 5 for input voltages 850 mV 1 and 8 5 V 10 Maximum non destructive input voltage 25 ViDC peak AC between signal and common of the same channel p Differential signal range DC coupled 8 5 V at attenuation setting of 10 850 mV at attenuation setting of 1 Common mode signal range DC coupled 7 V b
30. mation before making connections to the product Connect the ground lead of the probe to earth ground only Do Not Operate Without Covers Do not operate this product with covers or panels removed Do Not Operate With Suspected Failures If you suspect there is damage to this product have it inspected by qualified service personnel Do Not Operate in Wet Damp Conditions Do Not Operate in an Explosive Atmosphere Keep Product Surfaces Clean and Dry Provide Proper Ventilation Refer to the manual s installation instructions for details on installing the product so it has proper ventilation Symbols and Terms Terms in this Manual These terms may appear in this manual P6248 1 7 GHz Differential Probe Service Manual iii General Safety Summary A A WARNING Warning statements identify conditions or practices that could result in injury or loss of life CAUTION Caution statements identify conditions or practices that could result in damage to this product or other property Terms on the Product These terms may appear on the product DANGER indicates an injury hazard immediately accessible as you read the marking WARNING indicates an injury hazard not immediately accessible as you read the marking CAUTION indicates a hazard to property including the product Symbols on the Product The following symbols may appear on the product A A a CAUTION WARNING Double Protective Ground Refer to Manual Hi
31. nt Description Example product Calibrated DC voltage Adjustable from 0 V to 17 V Tektronix PS280 source 2 required Outputs must be isolated from earth ground DC bench supplies monitored with DMM are adequate DMM 2 required DC Accuracy 0 5 onrangeto Tektronix DMM916 measure 8 5 V averaging mode Network analyzer 100 kHz to 2 GHz with cables Hewlett Packard 8753D and adapters to BNC male Fully compatible with TEKPROBE Tektronix TDS 500 600 or interface needed only for function 700 series oscilloscope al check of the TEKPROBE inter Digitizing oscilloscope with TEKPROBE interface face P6248 1 7 GHz Differential Probe Service Manual 5 Performance Verification Preparation Table 5 Test equipment cont Description Example product Oscilloscope with sampling Tektronix 11800 series head oscilloscope with SD 24 TEKPROBE Power Supply Tektronix Type 1103 Tektronix Type 1103 BNC cables 2 50 Q 42 inch 012 0057 01 Banana to banana patch 2 red 012 0031 00 EEEa 1 black 012 0039 00 Adapter 3 Dual male banana to female BNC 103 0090 00 Adapter 2 BNC male to dual binding post 103 0035 00 0 025 square pins 3 Approximately 0 75 inch long 131 1614 00 smooth gold plated Precision inline BNC 50 2 0 1 011 0129 00 terminator Probe tip adapters included in the standard probe tip 020 2328 XX Y lead accessory kit BNC to probe tip probe ground lead Adapter SMA Male to male 015 1
32. pe input b Connect the Y lead adapter to the probe input Using square pins connect both leads to the red binding post of a binding post to BNC adapter Connect the BNC adapter to the function generator output If necessary use a BNC cable and a female to female BNC connector between the BNC adapter and the generator If the function generator reference shield of the BNC connector is isolated from ground connect the ground lead from the probe case to the black binding post NOTE Do not use the BNC to probe tip adapter for this connection The power level of the generator will exceed the terminator rating P6248 1 7 GHz Differential Probe Service Manual 23 Adjustment Procedures 24 c Connect a second BNC cable from the function generator Trigger or Sync Output to the External Trigger or Channel 2 Input of the oscillo scope Function generator i Test oscilloscope Ext trigger Ch1 50 Q terminator BNC to binding CH1 CH 1 Reale post adapter output input with square pins Ground lead m Black P6248 Y lead adapter Figure 12 Setup for DC CMRR and AC CMRR adjustments 2 Set the probe to 1 attenuation 3 Set the function generator to square wave 1 ms period 1 kHz frequency approximately 10 Vpk pk 5 Vpr 4 Set the oscilloscope to display channel 1 Set channel 1 to DC and 50 Q input impedance or use external terminator
33. quipment to warm up NOTE Ambient temperature must be within 20 C to 30 C 68 F to 86 F when you adjust the probe In addition to the equipment required to perform the performance verification the adjustment procedures require the equipment listed in Table 7 Table 7 Test equipment Description Example product Digitizing oscilloscope Bandwidth 100 MHz average Tektronix TDS 300 series f A acquisition mode vertical Required for adjustment sensitivity 2 mV div procedure only Function generator Output level adjustable to Tektronix CFG 280 10 Vpk pk Separate Trigger or Sync Square and sine wave output output P 50 Q terminator 011 0049 01 needed only if oscilloscope does not support 50 Q termination P6248 1 7 GHz Differential Probe Service Manual 19 Adjustment Procedures 1 Offset 10 Gain 10 Offset 10 DC CMRR 1 DC CMRR 10 AC CMRR 1 AC CMRR 20 Figure 9 shows the location of the adjustments inside the control box ro pro ro mo eak Figure 9 Adjustment locations P6248 1 7 GHz Differential Probe Service Manual Adjustment Procedures Offset preliminary NOTE Do not attempt to adjust offset directly on an oscilloscope equipped with TekProbe Interface These oscilloscopes utilize a closed loop compensation system for gain and offset which will interfere with th
34. resolution bandwidth to auto Record the level displayed on the spectrum analyzer 2 Remove the BNC cable from the 1103 input and insert the adapter and probe as shown in Figure 19 Use the CM pins of the BNC to probe tip adapter NOTE CMRR performance is influenced by cable dress When making CMRR measurements keep the probe cable away from ground planes and objects Do not allow kinks loops or other deformities in the probe cable and maintain a maximum distance between the probe head and the probe control box P6248 1 7 GHz Differential Probe Service Manual 41 Appendix A Alternate Verification Procedures 42 CH1 CH 1 output input mL 18 inch BNC cable o0 Spectrum analyzer P6248 18 inch BNC cable Frequency BSA b HE BNC to probe tip adapter d CM pair for O CMRR test Figure 19 Setup for the CMRR tests 3 Set the probe to 1 attenuation 4 Change the spectrum analyzer reference level to 20 dBm 5 Record the level displayed on the spectrum analyzer be sure to factor in the change in reference level 30 dBm It may be necessary to use the video filter to lower the noise floor Verify that the change in the level relative to the level recorded in step 1f above is less than or equal to the 1 measured feed through column of Table 9 on page 43 6 Set the probe to 10 attenuation 7 Record the level displayed on the spectrum analyzer
35. scope vertical sensitivity to 5 mV div Adjust the oscilloscope vertical positioning to center the signal on screen Adjust the oscilloscope horizontal sensitivity to 500 ps div Adjust the oscilloscope horizontal positioning to place the rising edge of the signal so that it crosses the second vertical and center horizontal graticule lines Use the oscilloscope measurement capability to display rise time Rise time is determined from the 10 and 90 amplitude points on the waveform Record the rise time for 10 as bun Calculate the probe rise time using the following formula 2 2 tere T ts Record the calculated probe rise time for 10 on the test record P6248 1 7 GHz Differential Probe Service Manual 13 Performance Verification Common Mode Rejection Ratio 14 Preparation Verification The following steps prepare the network analyzer for measuring common mode rejection ratio The actual settings may vary with different models of network analyzer Refer to the user documentation supplied with the network analyzer for details on performing these steps NOTE The alternative procedure for testing CMRR without a network analyzer begins on page 39 The 1103 power supply can operate two probes To keep the probe warmed up move it to channel 2 of the 1103 while normalizing channel 1 1 Set the network analyzer to measure transmission loss S21 Attach cables to both ports 2 Set the display format to log magnit
36. ude 1 dB div reference value 0 dBm and linear frequency 3 Set the start frequency to 1 MHz and stop frequency to 2 GHz 4 Set the test port power to 0 dBm 5 Attach the cable from port 1 to the 1103 channel 1 input connector Tek Probe connector Use a male BNC adapter if necessary 6 Attach the cable from port 2 to the 1103 channel 1 output connector conventional BNC Use a male BNC adapter if necessary 7 Normalize the network analyzer to remove the loss through channel 1 of the 1103 power supply 1 Disconnect the port 1 cable from the 1103 channel 1 input connector NOTE Do not remove the end connected to the network analyzer Connect the cable to the BNC to Probe Tip adapter 2 Move the probe from the 1103 channel 2 to channel 1 input connector 3 The setup should now appear as shown in Figure 8 P6248 1 7 GHz Differential Probe Service Manual Performance Verification Network analyzer Female N to male BNC adapter 1103 Female N to male EO ret BNC adapter BNC to probe tip adapter CM pair for CMRR test DM pair for bandwidth test Figure 8 Setup for CMRR test NOTE CMRR performance is influenced by cable dress When making CMRR measurements keep the probe cable away from ground planes and objects Do not allow kinks loops or other deformities in the probe cable and maintain a maximum
37. udes to compensate for the attenuation that is 68 dB 20 dB 48 dB The calculation has been performed in the 10 Measured Feed through column 14 Verify that the feedthrough is less than the values in 10 Measured Feedthrough column of Table 6 TEKPROBE Communication operational check This step verifies correct operation of the TEKPROBE interface communication with compatible oscilloscopes It requires a TDS 500 600 or 700 series oscilloscope Turn on the oscilloscope Wait for the power on self test to complete Disconnect all cables or probes from the inputs Press the Autoset button Press the CH 1 button Use the Vertical Scale knob to set the vertical scale factor to 100 mV div Press the Vertical Menu button Sk dE dE e ee E Select the Coupling menu left button along lower bezel 16 P6248 1 7 GHz Differential Probe Service Manual Performance Verification 8 If necessary set the input impedance to 1 MQ bottom button along right side of bezel 9 Watch the input impedance setting while attaching the probe to the CH 1 10 Verify that the input impedance changed to 50 Q 11 Set the probe attenuation to 10 12 Verify that the channel 1 scale factor is 1 V div 13 Set the probe attenuation to 1 14 Verify that the channel 1 scale factor is 100 mV div This completes the functional check and the performance verification P6248 1 7 GHz Differential Probe Service Manual 17 Performanc
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