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Tektronix P6248, Service Manual

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Tektronix P6248 Service Manual Download Page 40

Maintenance

28

P6248 1.7 GHz Differential Probe Service Manual

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

Tab

Figure 14: Replacing the TEKPROBE collar

Summary of Contents for P6248

Page 1: ...071 0573 03 P071057303 071057303 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 Ref...

Page 2: ...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...

Page 3: ...tions 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...

Page 4: ......

Page 5: ...fset Voltage 7 DC Attenuation Accuracy 8 Differential Signal Range 9 Rise Time 11 Common Mode Rejection Ratio 14 TEKPROBE Communication operational check 16 Adjustment Procedures 19 Equipment Required...

Page 6: ...ure 6 Test system rise time setup 11 Figure 7 Rise time setup for test system with probe 12 Figure 8 Setup for CMRR test 15 Figure 9 Adjustment locations 20 Figure 10 Setup for the offset adjustment 2...

Page 7: ...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...

Page 8: ...oduct 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 n...

Page 9: ...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 capabl...

Page 10: ...Service Safety Summary vi P6248 1 7 GHz Differential Probe Service Manual...

Page 11: ...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...

Page 12: ...Preface viii P6248 1 7 GHz Differential Probe Service Manual...

Page 13: ...ymbol Table 1 Warranted electrical characteristics Characteristic Description n 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 no...

Page 14: ...ical characteristics Tables 2 and 3 describe typical but not guaranteed performance Table 2 Typical electrical characteristics Characteristic Description Differential input resistance DC coupled 200 k...

Page 15: ...0 40 20 0 0 300 M 10 1 dB 600 M 900 M 1 2 G 1 5 G 1 8 G 2 G Figure 1 Typical Common Mode Rejection Ratio 1 and 10 attenuation Frequency Hz Impedance 100 k 10 k 1 k 100 10 0 1 G 500 M 250 M 750 M 1 25...

Page 16: ...0 47 in 0 36 in Dimensions output cable 1 2 m 47 in Unit weight probe only 160 g 5 4 oz 4 2 in 1 0 in 1 6 in 3 0 in 47 in 36 in Figure 3 Dimensions of probe head and compensation box Nominal Character...

Page 17: ...ay 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 n...

Page 18: ...1 011 0129 00 Probe tip adapters Y lead BNC to probe tip probe ground lead included in the standard probe tip accessory kit 020 2328 XX Adapter SMA Male to male 015 1011 00 Adapter 2 SMA Female to BNC...

Page 19: ...to male banana adapter 50 precision terminator 50 BNC cable P6248 BNC to probe tip adapter DM pair for offset test Figure 4 Setup for the output offset voltage test 2 Set the probe to 10 attenuation 3...

Page 20: ...actual voltage as Vin2 6 Record the output voltage as Vout2 7 Calculate the attenuation as follows Vin1 Vin2 Vout1 Vout2 8 Verify that the attenuation is in the range of 9 8 to 10 2 9 Set input voltag...

Page 21: ...e power supplies Digital multimeter Digital multimeter 1103 Calibrated DC voltage source Common mode source Calibrated DC voltage source Differential mode source P6248 CH 1 input CH 1 output Female BN...

Page 22: ...tial mode source to 0 85 V 10 mV Record the actual voltage as Vin 13 Make sure that the common mode source is still set to 7 0 V 50 mV 14 Set the probe attenuation to 1 15 Measure and record the outpu...

Page 23: ...ule 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 ts If the measurement r...

Page 24: ...t 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...

Page 25: ...n the test record 23 Set the probe attenuation to 10 24 Adjust the oscilloscope vertical sensitivity to 5 mV div 25 Adjust the oscilloscope vertical positioning to center the signal on screen 26 Adjus...

Page 26: ...both ports 2 Set the display format to log magnitude 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...

Page 27: ...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...

Page 28: ...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 Fe...

Page 29: ...tch the input impedance setting while attaching the probe to the CH 1 10 Verify that the input impedance changed to 50 11 Set the probe attenuation to 10 12 Verify that the channel 1 scale factor is 1...

Page 30: ...tion with connections reversed 9 5 9 5 _____________ _____________ _____________ _____________ 10 5 10 5 Differential signal range 1 setting Attenuation Attenuation with connections reversed 0 95 0 95...

Page 31: ...t to warm up NOTE Ambient temperature must be within 20_ C to 30_ C 68_ F to 86_ F when you adjust the probe Equipment Required In addition to the equipment required to perform the performance verific...

Page 32: ...P6248 1 7 GHz Differential Probe Service Manual Figure 9 shows the location of the adjustments inside the control box 1 Offset 10 Gain 1 Gain 10 Offset 10 DC CMRR 1 DC CMRR 10 AC CMRR 1 AC CMRR Figur...

Page 33: ...the probe as shown in Figure 10 Digital multimeter 1103 CH 1 input CH 1 output Female BNC to male banana adapter 50 precision terminator 50 BNC cable P6248 BNC to probe tip adapter DM pair for offset...

Page 34: ...ad 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 multimete...

Page 35: ...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 oscillos...

Page 36: ...el 1 Set channel 1 to DC and 50 input impedance or use external terminator 2 mV div Set the time division to 200 s div Set the trigger source to external or Channel 2 Set the acquisition mode to avera...

Page 37: ...cilloscope horizontal 100ns div If necessary adjust the channel 2 volts div and trigger level for a stable trigger 5 The displayed sine wave is the common mode feedthrough If the probe is severely mis...

Page 38: ...Adjustment Procedures 26 P6248 1 7 GHz Differential Probe Service Manual...

Page 39: ...UTION 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 Inter...

Page 40: ...llar 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...

Page 41: ...P6248 1 7 GHz Differential Probe Service Manual 29 Options Option 95 is a report of the calibration data This option must be ordered at the time of purchase...

Page 42: ...Options 30 P6248 1 7 GHz Differential Probe Service Manual...

Page 43: ...P6248 1 7 GHz Differential Probe Service Manual 31 Replaceable Parts 1 2 3 4 Figure 15 P6248 replaceable parts...

Page 44: ...scription Mfr code Mfr part number Probe 15 1 010 6248 00 1 PROBE DIFF ACT 1 7GHZ DIFFERENTIAL CERTIFICATE OF TRACEABLE CALIBRATION STANDARD P6248 80009 010 6248 00 2 211 0001 00 8 SCREW MACHINE 2 56...

Page 45: ...Replaceable Parts P6248 1 7 GHz Differential Probe Service Manual 33 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Figure 16 P6248 standard accessories...

Page 46: ...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 8 EACH 131 7143 00 060D9...

Page 47: ...Replaceable Parts P6248 1 7 GHz Differential Probe Service Manual 35 1 2 3 4 5 6 Figure 17 P6248 optional accessories...

Page 48: ...EST PKG OF 4 80009 SMK4 2 003 0675 00 1 SCREWDRIVER 5 INCH TOTAL PLASTIC W PLASTIC TIP ONE END METAL TIP OPPOSITE END P6055 PROBE AD 80009 003 0675 00 3 011 0049 01 1 TERMN COAXIAL 50 OHM 2W BNC 24931...

Page 49: ...Manufacturer Address City state zip code 060D9 UNITREK CORPORATION 3000 COLUMBIA HOUSE BLVD SUITE 120 VANCOUVER WA 98661 24931 BERG ELECTRONICS INC BERG ELECTRONICS RF COAXIAL DIV 2100 EARLYWOOD DR PO...

Page 50: ...Replaceable Parts 38 P6248 1 7 GHz Differential Probe Service Manual...

Page 51: ...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...

Page 52: ...nnect 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 2 Attach the probe to the 1103 TEKPROBE power...

Page 53: ...f 10 dBm d Set the reference level to 10 dBm the center frequency to 1 MHz and the vertical scale to 10 dB div e Adjust the span to 10 kHz and the resolution bandwidth to auto f Record the level displ...

Page 54: ...he 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 tha...

Page 55: ...umn of Table 9 on page 43 15 Set the probe to 10 attenuation 16 Record the level displayed on the spectrum analyzer Verify that the change in the level relative to the level recorded in step 11 on pag...

Page 56: ...Appendix A Alternate Verification Procedures 44 P6248 1 7 GHz Differential Probe Service Manual...

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