P6248 1.7 GHz (Typical) Differential Probe Service Manual
Contents
1. NOTE See the appendix for an alternative procedure for testing CMRR without a network analyzer 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 S2 Attach cables to both ports Set the display format to log magnitude 1 dB div reference value 0 dBm and linear frequency Set the start frequency to 1 MHz and stop frequency to 22 GHz Set the test port power to 0 dBm Attach the cable from port 1 to the 1103 channel 1 input connector TekProbe connector Use a male BNC adapter if necessary Attach the cable from port 2 to the 1103 channel output connector conventional BNC Use a male BNC adapter if necessary Normalize the network analyzer to remove the loss through channel of the 1103 power supply P6248 1 7 GHz Differential Probe Service Manual Performance Verification Verification 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 See Figure 8 CH 1 CH 1 Network analyzer output input Female N to male BNC adapter 1103 00 O 00 Po2. Verify that the output voltage is lt 10 mV Keep the output connections for the next procedure P6248 1 7 GHz Differential Probe Service Manual DM pair for offset test CH 1 input 1103 oO 00 Performance Verification DC Attenuation Accuracy is q gt oo el A 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 Vil Record the output voltage as Voul Set the input voltage on the DC source to approximately 1 V Record the actual voltage as Vin2 Record the output voltage as Vou2 Calculate the attenuation as follows Vinl Vin2 Voutl Vou2 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 Vil Change the attenuation to 1 Record the output voltage as Voul Set input voltage on DC source to approximately 0 1 V Record the actual voltage as Vin2 Record the output voltage as Vou2 Calculate the attenuation as follows Vinl Vin2 Voul Vou2 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 Thi
3. 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 CH 1 CH 1 output input Spectrum analyzer 1103 00 18 inch BNC cable o0 OJ N Frequency iti d BNC to probe tip adapter 18 inch BNC cable CM pair for CMRR test O 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 1 f above is less than or equal to the 1 measured feed through column of the table See Table 13 on page 41 P6248 1 7 GHz Differential Probe Service Manual 39 Appendix A Alternate Verification Procedures 10 11 12 13 14 15 16 17 18 19 20 21 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 1 f above is less than or equal to the 10 measured feed through column of the table See T
4. This completes the adjustment procedures P6248 1 7 GHz Differential Probe Service Manual Maintenance The procedures in this section describe how to maintain and repair the P6248 differential probe Cleaning Remove dirt with a soft cloth dampened in a mild detergent and water solution or isopropyl alcohol CAUTION To avoid damaging the probe use only a mild detergent and water solution or isopropyl alcohol do not use any other solvents or abrasive 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 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 G Slot Figure 14 Replacing the TEKPROBE collar 28 P6248 1 7 GHz Differential Probe Service Manual Options Option 95 is a report of the calibration data This option must be ordered at the time of purchase P6248 1 7 GHz Different
5. Do Not Operate Without Covers Do not operate this product with covers or panels removed Do Not Operate With Suspected Failures If you suspect that there is damage to this product have it inspected by qualified service personnel Avoid Exposed Circuitry Do not touch exposed connections and components when power is present 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 P6248 1 7 GHz Differential Probe Service Manual 111 General Safety Summary Terms in this Manual Symbols and Terms on the Product iv These terms may appear in this manual 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 These terms may appear on the product DANGER indicates an injury hazard immediately accessible as you read the marking m WARNING indicates an injury hazard not immediately accessible as you read the marking m CAUTION indicates a hazard to property including the product The following symbol s may appear on the product A AB 9 CAUTION WARNING Double Protective Ground Refer to Manual High Voltage Insulated Earth
6. Terminal P6248 1 7 GHz Differential Probe Service Manual Service Safety Summary 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 Disconnect Power To avoid electric shock switch off the instrument power then disconnect the power cord from the mains power Use Care When Servicing With Power On Dangerous voltages or currents may exist in this product Disconnect power remove battery if applicable and disconnect test leads before removing protective panels soldering or replacing components 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 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 P6248 1 7 GHz Differential Probe Service Manual vii Preface viii P6248 1 7 GHz Differential Probe Service Manual Specifications The specifications in the following tables apply to a P6248 differential probe installed on a Tektronix TDS694C osc
7. limits 10 Frequency 1 CMRR 10 CMRR 1 Measured Measured 1 MHz gt 60 dB 245 dB lt 60 dBm lt 65 dBm 100 MHz gt 38 dB gt 25 dB lt 38 dBm lt 45 dBm 500 MHz 235 dB gt 20 dB lt 35 dBm lt 40 dBm 1 GHz 230 dB gt 18 dB lt 30 dBm 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 magnitudes to compensate for the attenuation that is 68 dB 20 dB 48 dB The calculation has been performed in the 10 Measured Feedthrough column 14 Verify that the feedthrough is less than the values in 10 Measured Feedthrough column of the table See Table 6 P6248 1 7 GHz Differential Probe Service Manual Performance Verification TEKPROBE Communication Operational Check This step verifies correct operation of the TEKPROBE interface communication with compatible oscilloscopes It requires a TDS500 TDS600 or TDS700 series oscilloscope 2 NS we eS Se SS 10 11 12 13 14 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 Pre
8. parts 0 ccc cece cece near 31 P6248 standard acceSSOTICS 0 aan 32 P6248 optional accessories cece cece cece ene ne nnn EE EEE Ene EEE EEE EEE EEE EE EEE ES 34 Normalizing the Setups sa aaa e ceva scan ata alai aa a aa aia aa a d E a alia da ar a 38 Setup for the CMRR tests msn e cca ara cn tea tc e tat oa en aa ta ate it 39 P6248 1 7 GHz Differential Probe Service Manual General Safety Summary 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 Personal Connect and Disconnect Properly Do not connect or disconnect probes or test Injury leads while they are connected to a voltage source 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 information before making connections to the product Connect the probe reference lead to earth ground only
9. 0 dB at 1 MHZ in 1 38 dB at 100 MHz in 1 35 dB at 500 MHz in 1 30 dB at 1 GHz in 1 Bandwidth probe only DC to 21 5 GHz 3dB P6248 1 7 GHz Differential Probe Service Manual Specifications Table 1 Warranted electrical characteristics cont Characteristic Description Temperature Operating 0 to 50 C 32 to 86 F 0 to 60 C 32 to 122 F 1 probe head Nonoperating 55 to 75 C 131 to 167 F 1 Humidity 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 1 See warning that follows WARNING To avoid a burn hazard at high ambient temperatures do not touch 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 describe typical but not guaranteed performance See Table 2 Table 2 Typical electrical characteristics Characteristic Description Differential input 200 kQ 2 resistance DC coupled Common mode input 100 kQ 2 resistance DC coupled 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 mVaus or 1 0 Vp p output at 100 MHz Differential offset range 7
10. 00 mV 1 range 7 V 10 range Common mode rejection ratio See Figure 1 on page 3 Random noise lt 50 nV VHz 100 MHz Input impedance See Figure 2 on page 3 Pass band ripple lt 0 5 dB to 850 MHz deviation from a nominal slope Bandwidth probe only DC to 21 7 GHz 34B lt 27 C 1 range DC to 21 85 GHz 3dB lt 27 C 10 range Rise time probe and oscilloscope lt 265 ps P6248 1 7 GHz Differential Probe Service Manual Specifications 0 300 M 600 M 900 M 12G 156 18G 2G Frequency Hz 0673 016 Figure 1 Typical Common Mode Rejection Ratio 1 and 10 attenuation 100 k 10k Impedance Q O 0 250M 500M 750M 1G 125G 150G 175G 26 Frequency Hz 10573017 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 0 63 mm 0 025 in square pin on 2 54 mm 0 100 in centers connection Dimensions control 107 mm x 41 mm x 26 mm 4 2 in x 1 6 in x 1 0 in box Dimensions probe 78 mm x 12 mm x 9 3 mm 3 0 in x 0 47 in x 0 36 in head Dimensions output 1 2 m 47 in cable Unit weight probe only 160 g 5 4 oz Figure 3 Dimensions of probe head and compensation box Nominal Ch
11. C 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 9 Change the probe to 10 attenuation 10 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 11 Keep the connections for the next procedure P6248 1 7 GHz Differential Probe Service Manual 25 Adjustment Procedures AC CMRR 26 10 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 stable 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
12. Hz 40 dB N A 1 GHz 38 dB N A 18 P6248 1 7 GHz Differential Probe Service Manual Adjustment Procedures Equipment Required These procedures are for use by qualified service personnel only Prepare the probe for adjustment as follows Oe E oe Remove the top cover Turn on the 1103 power supply Remove the four screws attaching the top cover from the control box Attach the probe to the 1103 TEKPROBE power supply If necessary set the line selector to the correct voltage Set the 1103 power supply offset to off button not illuminated Allow at least 20 minutes for the equipment 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 below See Table 8 Table 8 Test equipment Description Minimum requirements Example product Digitizing oscilloscope Required for adjustment procedure only Function generator Square and sine wave output Bandwidth 2100 MHz average acquisition mode vertical sensitivity 2 mV div Output level adjustable to 10 Vor Separate Trigger or Sync output Tektronix TDS300 series Tektronix CFG280 50 Q terminator needed only if oscilloscope does not support 50 Q termination 500410 Tektronix part number 011 0049 01 P6248 1 7 GHz Different
13. OF FIVE COLORS 10 206 0569 XX 3 TIP PROBE MICROCKT TEST 0 05 CTR 11 016 1952 00 1 CASE CARRYING PROBE CARRYING CASE P6248 071 0566 XX 1 MANUAL TECH INSTRUCTION P6248 071 0573 XX 1 MANUAL TECH SERVICE P6248 P6248 1 7 GHz Differential Probe Service Manual 33 Replaceable Parts Figure 17 P6248 optional accessories 34 P6248 1 7 GHz Differential Probe Service Manual Table 11 Optional accessories Fig amp Tektronix Serial Replaceable Parts index part no Serial no number number effective discont d Qty Name amp description 17 1 016 1783 00 1 ACCESSORY KIT GROUND CONTACTS PKG OF 10 131 6247 00 2 016 1782 00 1 ACCESSORY KIT SPRING LOADED GROUND PINS PKG OF 6 131 6271 00 3 016 1786 00 1 TIP PROBE PKG OF FOUR 013 0305 00 4 016 1890 00 1 ACCESSORY KIT PROBE TIP ADAPTER VARITIP 8 EACH 131 7142 00 5 016 1785 00 1 ADAPTER DIFFERENTIAL PROBE PKG OF FOUR 013 0306 00 6 679 4094 00 1 CKT BD SUBASSY PROBE TIP TO BNC ADAPTER 7 SMK4 1 TIP PROBE MICROCKT TEST PKG OF 4 8 003 0675 00 1 ADJUSTMENT TOOL 5 INCH TOTAL PLASTIC W PLASTIC TIP ONE END METAL TIP OPPOSITE END 9 011 0049 01 1 TERMN COAXIAL 50 OHM 2W BNC 10 1103 1 1103 TEKPROBE POWER SUPPLY 11 012 0076 00 1 CA ASSY RF COAXIAL RFD 50 OHM 20 L BNC MALE STR BOTH ENDS W STRAIN RELIEF BOOT BOTH ENDS 12 679 5027 00 1 CKT BD SUBASSY 1394 ADAPTER P6248 1 7 GHz Differential Probe Service Manual 35 Replacea
14. P6248 1 7 GHz Typical Differential Probe Service Manual TI DU UT A AI Tektronix 071 0573 04 Y P6248 1 7 GHz Typical Differential Probe Service Manual 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 www tektronix com 071 0573 04 Tektronix 7 Copyright Tektronix All rights reserved Licensed software products are owned by Tektronix or its subsidiaries or suppliers and are protected by national copyright laws and international treaty provisions Tektronix products are covered by U S and foreign patents issued and pending Information in this publication supersedes that in all previously published material Specifications and price change privileges reserved TEKTRONIX and TEK are registered trademarks of Tektronix Inc KlipChip TwinFoot TwinTip and VariTip are trademarks of Tektronix Inc Contacting Tektronix Tektronix Inc 14200 SW Karl Braun Drive P O Box 500 Beaverton OR 97077 USA For product information sales service and technical support In North America call 1 800 833 9200 Worldwide visit www tektronix com to find contacts in your area 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 If a
15. able 13 on page 41 These values are 20 dB lower than the specification to account for the 10 attenuation Set the synthesizer to 100 MHz and 0 dBm 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 See Figure 18 on page 38 Record the level displayed on the spectrum analyzer Remove the BNC cable from the 1103 input and insert the adapter and probe as shown See Figure 19 on page 39 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 is less than or equal to the 1 measured feedthrough column of the table See Table 13 on page 41 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 is less than or equal to the 10 measured feedthrough column of the table See Table 13 on page 41 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 d
16. aracteristics Nominal characteristics describe guaranteed traits but the traits do not have tolerance limits See Table 4 Table 4 Nominal electrical characteristics Characteristic Description Input configuration Differential two inputs and with case ground Output coupling DC Attenuation settings 1 and 10 Termination Terminate output into 50 Q 4 P6248 1 7 GHz Differential Probe Service Manual Performance Verification Equipment Required Table 5 Test equipment Use the following procedures to verify the warranted specifications of the P6248 Differential Probe Before beginning these procedures 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 Output offset voltage DC attenuation accuracy Differential signal range Rise time m Common mode rejection ratio The equipment required to perform the performance verification procedure is listed below See Table 5 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 the appendix for See page 37 Alternate Verification Procedures procedures that do not require a network analyzer to perform the CMRR tests Description Minimum requirements Example product Calibrated DC voltage source Adjustab
17. ble Parts 36 P6248 1 7 GHz Differential Probe Service Manual 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 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 12 Test equipment Description Minimum requirements Example product Sine wave generator 0 dBm to 20 dBm from Fluke 6066 preferably a synthesizer 1 MHz to 1 5 GHz Spectrum analyzer 1 MHz to 1 8 GHz dynamic Advantest R3365A range 2100 dBm at 1 MHz TEKPROBE Power Supply Tektronix Type 1103 Tektronix Type 1103 BNC to Type N coax Type N male to BNC female Tektronix part number adapters 2 103 0045 00 BNC cables 2 50 Q 18 inch Tektronix part number 012 0076 00 BNC to probe tip adapter Tektronix part number 679 4094 00 P6248 1 7 GHz Differential Probe Service Manual 37 Appendix A Alternate Verification Procedures Preparation Allow all test equipment to warm up for 20 minutes in an environment that is within the environmental conditions s
18. cilloscope 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 4 Calculate the probe rise time using the following formula ty ioe ad Record the calculated probe rise time for 1 on the test record Set the probe attenuation to 10 Press Autoset on the oscilloscope Adjust the oscilloscope 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 Calculate the probe rise time using the following formula tp Us p 2 t52 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 Preparation 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
19. ial Probe Service Manual 19 Adjustment Procedures Adjustment locations The location of the adjustments inside the control box are shown below 1 Offset txlo_ 10 Gain o 1 Gain o llo Mie ea 10 DC CMRR ho e 1DC 10 AC CMRR po te esc Figure 9 Adjustment locations 20 O 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 the manual adjustment of the probe 1 Connect the probe as shown See Figure 10 CH 1 CH 1 output input Digital multimeter 1103 50 O BNC cable OO o0 o O Oo O Female BNC to male banana adapter 50 O precision terminator P6248 TE 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 asa ee p Keep the output cable se
20. ial Probe Service Manual 29 Options 30 P6248 1 7 GHz Differential Probe Service Manual Replaceable Parts Figure 15 P6248 replaceable parts Table 9 P6248 Probe replaceable parts list Fig amp Tektronix Serial Serial index part no no number number effective discont d Qty Name amp description 15 1 010 6248 00 1 PROBE DIFF ACT 1 7GHZ DIFFERENTIAL CERTIFICATE OF TRACEABLE CALIBRATION STANDARD P6248 2 211 0001 00 8 SCREW MACHINE 2 56 X 0 25 PNH STL CD PL POZ 3 131 3627 02 1 CONTACT ELEC GOLD PLATED TIP 4 205 0191 01 1 P6248 1 7 GHz Differential Probe Service Manual SHELL ELEC CONN BNC ABS DOVE GRAY 31 Replaceable Parts g DF Yy A 0573 002 Figure 16 P6248 standard accessories 32 P6248 1 7 GHz Differential Probe Service Manual Table 10 Standard accessories Replaceable Parts Fig amp Serial Serial index Tektronix part no no number number effective discontd Qty Name amp description 16 1 020 2702 02 1 ACCESSORY PKG P6248 Includes items 2 through 10 2 196 3434 00 2 Y LEAD ADAPTER 3 196 3504 XX 1 SOLDER DOWN LEAD 1 INCH 4 196 3505 00 1 SOLDER DOWN LEAD 3 INCH 5 196 3437 XX 2 GROUND LEAD 6 016 1781 00 1 ACCESSORY KIT TIP SAVER PKG OF 2 7 016 1780 00 1 ADAPTER LONGHORN VIA PKG OF 2 8 016 1891 00 1 ACCESSORY KIT PROBE TIP ADAPTER STRAIGHT 8 EACH 131 7143 00 9 016 1315 00 1 MARKER KIT ID CABLE MARKER BAND 2 EACH
21. iii A A da ets 5 Equipment Reg ired ren esere unice oii das a aa ale et at a Ul d tata 5 Prepar ti Otis cica o a dd ii aa e edi e pt 6 Output Offset Voltage A as 7 DC Attentation ACCUrACY qui da odias 8 Differential Signal Range isi333 eccecee stones coeds aia sa a is 9 RISE Tiss cotate 8 mia aa ii 11 Common Mode Rejection Ratio eee EEE EEE ea 14 TEKPROBE Communication Operational Check oooooccoocconccnnnccnnonnnconconnn eeaeenaeeeaes 17 Adjustment Procedures n sn ce sa e cea rata a EE ERER EAE o duete dhs aa ala pi onesies aut ii 19 Equipment REguired sasea e a tones int Bia Pta a atasa E p i ata a i ta a i 19 Adjustment locations e ss saca miei dia ete eat A S ia rE ella d ai alo ta 20 Offset preliminary i asia oc neta nenea a ace ar Da tat ina ata ana ala a aaa dea ta dia tn c 21 O a ads lata a d ta na osia atasa la and 22 Offset Final A A a 23 DC CMRR e nea at A a ia a o a ata d A 24 AC CMRR sn ee ai a a le ta mt a oc ee aia ltd ela aid apa OB 26 Maintenances scria atena 0 a 0 nai toaca i ie tale a 27 Cleaning assis E RA A A ins 27 Replacing TEKPROBE Interface Pins 0 cece cece cence eect eee ene eee nee eee ene eeaes 27 Removing and Replacing the TEKPROBE Interface Collar 0 esere 28 OPUONS a AAA ta wale dat E E me mace 29 Replaceable Parts ui iii des 31 Appendix A Alternate Verification Procedures ooooooooccoccconoconnonnnccnconnncrn nan nn non nan nese nenes 37 Equipmen
22. illoscope 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 the environmental specifications table Specifications for the P6248 differential probe fall into three categories warranted typical and nominal characteristics Warranted Characteristics Warranted characteristics describe guaranteed performance within tolerance limits or certain type tested requirements See Table 1 Warranted characteristics that have checks in the Performance Verification section are marked with the symbol Table 1 Warranted electrical characteristics Characteristic Description Y DC attenuation 2 for input voltages 750 mV 1 and 7 5 V 10 accuracy 15 for input voltages 850 mV 1 and 8 5 V 10 Maximum 25 V oc peak ac between signal and common of the same channel nondestructive input voltage 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 7V M Output offset voltage 10 mV 20 to 30 C 68 to 86 F 50 mV 0 to 50 C 32 to 122 F Rise time probe only lt 265 ps 14 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 6
23. 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 mV Set the probe attenuation to 1 Measure and record the output voltage as Vou 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 Vou 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 You first measure the rise time of the test system alone and then you measure the rise time with the probe in the circuit The probe rise time is then calculated from the two measured rise times 1 Connect the test equipment as shown See Figure 6 Initialize the oscilloscope and set the CH1 and CH2 sampling heads to ON Set the TDR function on CH2 to ON Set the triggering to Internal Clock WF amp N Adjust the oscilloscope Press Autoset Vertical sensitivity to 50 mV div Vertical positioning to center the signal on screen Horizontal sensitivity to 500 ps div Horizontal positioning to place the rising edge of the sig
24. ip accessory kit 196 3434 XX Adapter BNC to probe tip 679 4094 XX Adapter SMA Male to male 015 1011 00 Adapter 2 SMA Female to BNC male 015 0572 00 1 Nine digit part numbers are Tektronix part numbers Preparation 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 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 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 6 P6248 1 7 GHz Differential Probe Service Manual Output Offset Voltage 1 Performance Verification Connect the probe as shown in the figure See Figure 4 CH 1 output Digital multimeter 50 O BNC cable O O AA O 50 Q precision terminator Female BNC to male banana adapter BNC to probe tip adapter Figure 4 Setup for the output offset voltage test 2 3 4 5 6 Set the probe to 10 attenuation Verify that the output voltage is lt 10 mV Change the probe attenuation to 1
25. le from 0 V to 217 V Outputs must be isolated Tektronix PS280 2 required from earth ground DC bench supplies monitored with DMM are adequate DMM DC Accuracy gt 0 5 on range to measure 8 5 V Tektronix DMM916 2 required averaging mode Network analyzer 100 kHz to 22 GHz with cables and adapters to BNC male Hewlett Packard 8753D Digitizing oscilloscope with TEKPROBE interface Fully compatible with TEKPROBE interface needed only for functional check of the TEKPROBE interface Tektronix TDS500 TDS600 or TDS700 series oscilloscope Oscilloscope with sampling head Tektronix 11800 series oscilloscope with SD 24 TEKPROBE Power Supply Tektronix Type 1103 Tektronix Type 1103 BNC cables 2 50 Q 42 inch 012 0057 01 SMA cables 2 50 Q 015 0562 00 P6248 1 7 GHz Differential Probe Service Manual Performance Verification Table 5 Test equipment cont Description Minimum requirements Example product Banana to banana patch cords 3 2 red 012 0031 00 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 smooth gold plated 131 1614 00 Precision in line BNC termination 50 Q 0 1 011 0129 00 Probe ground lead included in the standard probe tip accessory kit 196 3437 XX Adapter Y lead included in the standard probe t
26. nal 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 If the measurement reading is not stable use Average mode 32 Averages to improve stability The system rise time 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 in steps 22 and 31 BNC to SMA adapter CH 1 CH 1 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 P6248 1 7 GHz Differential Probe Service Manual 11 Performance Verification The following steps instruct you to assemble the test setup that includes the probe See Figure 7 The system and probe rise time that you measure in steps 21 and 30 is used to calculate the probe rise time in steps 22 and 31 7 8 9 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 Connec
27. ny 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 Parts modules and replacement products used by Tektronix for warranty work may be new or reconditioned to like new performance All replaced parts modules and products become the property of Tektronix 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 to repair damage resulting fr
28. oes 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 40 Repeat steps 10 through 16 P6248 1 7 GHz Differential Probe Service Manual Table 13 CMRR and measured feedthrough limits Appendix A Alternate Verification Procedures 1 measured 10 measured Frequency 1 CMRR 10 CMRR feedthrough feedthrough 1 MHz 260 dB 245 dB lt 60 dBm lt 65 dBm 100 MHz 238 dB 225 dB lt 38 dBm lt 45 dBm 500 MHz 235 dB 220 dB lt 35 dBm lt 40 dBm 1 GHz 230 dB 218 dB lt 30 dBm lt 38 dBm P6248 1 7 GHz Differential Probe Service Manual 41
29. om 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 WITH RESPECT TO THE PRODUCT 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 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 W2 15AUG04 Table of Contents General Safety A a O ia 111 Service Safety Summary donas v Pda in n e ostas n n aa la aa ac esa a aa aaa pt a vii Related Manals orce ir re atata an ia ata 880 ina at aaa 3 anda arad bias vii Specifications i m saraca dea cede d atare ri aa cette ul Gated swede canes oe tc sl ta Dai au ii 1 Warran edCharacteristics ae see ia ca e inaite et ua ea tan ata Oare lada ai taia ra aia ae ad 1 Typical Characteristios iii a 8 ao a ata ia 8 ta bn 2 Nominal Characteristics 4 Performance VerificatiOn
30. pecified See 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 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 CMRR Common Mode Rejection Ratio 38 1 Normalize the setup as follows a Connect the equipment as shown See Figure 18 CH 1 CH 1 output input Spectrum analyzer Frequency synthesizer 18 inch BNC cable Figure 18 Normalizing the setup b Set the synthesizer to 1 MHz and 10 dBm c Adjust the spectrum analyzer input attenuator to accept the high level of 10 dBm d Set the reference level to 10 dBm the center frequency to 1 MHz and the vertical scale to 10 dB div P6248 1 7 GHz Differential Probe Service Manual Appendix A Alternate Verification Procedures e Adjust the span to 10 kHz and the resolution bandwidth to auto f 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 See Figure 19 on page 39 Use the CM pins of the BNC to probe tip adapter
31. r 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 P6248 1 7 GHz Differential Probe Service Manual 23 Adjustment Procedures DC CMRR 24 Set up the equipment as shown See 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 in line BNC terminator at the oscilloscope input b Connect the Y lead adapter to the probe input c Using square pins connect both leads to the red binding post of a binding post to BNC adapter d 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
32. rating 2 Connect a second BNC cable from the function generator Trigger or Sync Output to the External Trigger or Channel 2 input of the oscilloscope Function generator i Test oscilloscope Ext trigger Output p Sync BNC to binding post adapter with square pins 50 Q terminator CH 1 CH 1 output input o0 Ground lead sie P6248 Red Black Y lead adapter Figure 12 Setup for DC CMRR and AC CMRR adjustments 3 Set the probe to 1 attenuation P6248 1 7 GHz Differential Probe Service Manual Adjustment Procedures 4 Set the function generator to square wave 1 ms period 1 kHz frequency approximately 10 Vpk pk 5 Vox 5 Set the oscilloscope to display channel 1 Set channel 1 to DC and 500 input impedance or use external terminator 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 6 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 7 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 8 Adjust the 1 D
33. rt 1 P6248 Female N to male Pi 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 distance between the probe head and the probe control box P6248 1 7 GHz Differential Probe Service Manual 15 Performance Verification 10 Set the reference value of the network analyzer to 0 dBm Connect the probe input to the CM pins on the BNC to probe tip adapter Polarity is unimportant Set the probe for 1 attenuation Position the 0 dBm reference near the top of the screen 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 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 Verify that the feedthrough is less than the values in the 1 Measured Feedthrough column of the table See Table 6 Table 6 CMRR and Measured Feedthrough
34. s procedure directly verifies the differential signal range and indirectly verifies the common mode signal range 1 Connect the probe as shown in the figure See Figure 5 Use the adapters 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 CH 1 CH 1 output input Ground lead Digital multimeter 1103 50 Q BNC cable _ cy O O 7 O Female BNC to male 50 Q precision terminator 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 Measure and record the output voltage as Vou Calculate attenuation as Vin Vout Verify that the attenuation is in the range of 9 5 to 10 5 So St Sw Remove the Y lead adapter from the probe and reverse the connection black to red to P6248 1 7 GHz Differential Probe Service Manual 9 Performance Verification 10 11 12 13 14 15 16 17 18 19 20 21 22 Measure and record the output voltage as Vou Calculate attenuation as Vin Vout Verify that the attenuation is
35. ss the Vertical Menu button Select the Coupling menu left button along lower bezel If necessary set the input impedance to 1 MQ bottom button along right side of bezel Watch the input impedance setting while attaching the probe to the CH 1 Verify that the input impedance changed to 50 Q Set the probe attenuation to 10 Verify that the channel 1 scale factor is 1 V div Set the probe attenuation to 1 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 Performance Verification Table 7 Probe Model Serial Number Certificate Number Temperature RH Date of Calibration Technician Performance test Minimum Incoming Outgoing Maximum Output offset voltage 20 C to 30 C 10 setting 10 mV 10 mV 1 setting 10 mV 10 mV DC attenuation accuracy 10 setting 9 8 10 2 1 setting 0 98 1 02 Differential signal range 10 setting Attenuation 9 5 10 5 Attenuation with connections reversed 9 5 10 5 1 setting Attenuation 0 95 1 05 Attenuation with connections reversed 0 95 1 05 Rise time 1 setting lt 265 ps N A 10 setting lt 265 ps N A Measured feedthrough verifies CMRR specifications 1 setting 1 MHz 60 dB N A 100 MHz 38 dB N A 500 MHz 35 dB N A 1 GHz 30 dB N A 10 setting 1 MHz 65 dB N A 100 MHz 45 dB N A 500 M
36. t Required da 37 Pr its 38 CMRR Common Mode Rejection Ratio c eee eee anna 38 P6248 1 7 GHz Differential Probe Service Manual i Table of Contents List of Figures 11 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 Typical Common Mode Rejection Ratio 1 and 10 attenuation ooococcoccocccnconccnccncono 3 Typical differential input impedance versus frequency ooocoocconconccnccnncnccnncnnconcanacnnons 3 Dimensions of probe head and compensation bOX 0 cccce eee nenea 4 Setup for the output offset voltage test 2 0 0 0 ccc c cece cece e ee eee eee ss eee e ene ena e ees 7 Setup for differential mode tests cena 9 Test system rise time UD dans 11 Rise time setup for test system with probe eee 12 Setup for CMRR test reiissi iaia a a aaa aide aa ia iad aaa d d ia EESE esate 15 Adjustment loc tions iii ice aceea ei talin tt dle ca la aia a A ed a c 20 Setup for the offset adjustment lt eee aaa 21 Setup for gain adjustment eerren eee anna 22 Setup for DC CMRR and AC CMRR adjustments 6 0 ccc eee e cee ee eens eee enanenes 24 Replacing TEKPROBE interface pins 0 cc cece cece cece eee eens cnet cnn a ne tent ene e ed 27 Replacing the TEKPROBE collar 0 0 eee ear 28 P6248 replaceable
37. t 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 probe should be on the center square pin of the probe tip adapter The test setup should now appear as shown See Figure 7 BNC to SMA adapter 015 0572 00 CH1 CH 1 11800 SD24 output input Oscilloscope SMA cable 1103 015 0562 00 00 O 00 SMA Male to male adapter SMA to BNC ada to pter 015 1011 00 015 0572 00 A BNC to probe tip adapter 679 4094 00 P6248 Figure 7 Rise time setup for test system with probe P6248 1 7 GHz Differential Probe Service Manual 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Performance Verification Set the probe attenuation to 1 Press Autoset on the oscilloscope 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 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 os
38. t up for the next step P6248 1 7 GHz Differential Probe Service Manual 21 Adjustment Procedures Gain 1 Set up the equipment as shown See 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 n Digital multimeter Y lead adapter Digital multimeter 50 Q BNC cable O O Ae o omo m 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 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 22 P6248 1 7 GHz Differential Probe Service Manual Adjustment Procedures 7 Change the probe attenuation to 10 8 Change the DMM monitoring the input to the 20 o
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