Tektronix P7380SMA Instruction Manual Download

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Instruction Manual

P7380SMA

8 GHz Differential Probe
071-1392-01

Warning

The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to all safety summaries prior to
performing service.

www.tektronix.com

Summary of Contents for P7380SMA

Page 1: ...071 1392 01 Warning The servicing instructions are for use by qualified personnel only To avoid personal injury do not perform any servicing unless you are qualified to do so Refer to all safety summ...

Page 2: ...oreign 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 Bea...

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: ...14 Termination Voltage Monitor Jacks 14 Auxiliary Output SMA Connector 14 Functional Check 15 Power on Self Test 16 Signal and Termination Voltage Monitor Check 17 Aux Output Check 20 DC Termination...

Page 6: ...ode 45 Int Mode 45 Ext Mode 45 Overdrive Error 47 Differential and Single Ended Signal Measurement 48 Differential Measurement Topology 48 Differential Dynamic Range 49 Single Ended Measurement Topolo...

Page 7: ...to SMA Adapter 75 Equipment Setup 76 Input Resistance 77 Termination Voltage Accuracy 78 Ext Mode 78 Int Mode 79 Auto Mode 80 Output Offset Zero 82 DC Gain Accuracy 83 Gain Check at 2 5X Attenuation 8...

Page 8: ...nd current table 39 Table 6 Differential to single ended conversion table 55 Table 7 Serial bus standards with dynamic range requirements 63 Table 8 Warranted electrical characteristics 65 Table 9 Typ...

Page 9: ...13 P6150 probe tips 32 Figure 14 Simplified model of a differential amplifier 36 Figure 15 Input termination network 37 Figure 16 Probe maximum input limits 42 Figure 17 Differential and Common Mode o...

Page 10: ...acy Ext mode setup 78 Figure 38 Termination Voltage Accuracy Auto mode setup 80 Figure 39 Setup for the output offset zero test 82 Figure 40 DC Gain Accuracy setup 83 Figure 41 Reverse the power suppl...

Page 11: ...ntial Probe Instruction Manual vii Preface This is the Instruction Manual for the P7380SMA differential probe This manual provides operating information specifications and performance verification pro...

Page 12: ...ronix com Sales support 1 800 833 9200 select option 1 Service support 1 800 833 9200 select option 2 Technical support www tektronix com support 1 800 833 9200 select option 3 6 00 a m 5 00 p m Pacif...

Page 13: ...disconnecting the probe from the measurement instrument Observe All Terminal Ratings To avoid fire or shock hazard observe all ratings and markings on the product Consult the product manual for furthe...

Page 14: ...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...

Page 15: ...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 adjus...

Page 16: ...Service Safety Summary xii P7380SMA 8 GHz Differential Probe Instruction Manual...

Page 17: ...mmon mode DC termination voltage The termination voltage range allows the termination voltage to be set to any value within the specified common mode voltage range of the input signal The DC terminati...

Page 18: ...ps connected to protect the circuitry from damage Always leave the Auxiliary output connector terminated when not in use to provide the best signal fidelity for the main probe output Probe Controls an...

Page 19: ...ling the DC termination voltage with an external DC power supply You should use the Banana to 0 080 in plug adapter cables included with the probe when connecting external control voltages to these te...

Page 20: ...n three termination voltage control modes Auto Internal and External The three indicator LEDs light briefly when the probe is powered on and then the Auto LED lights 1 The probe initially sets to Auto...

Page 21: ...ut signal Use this auxiliary signal to trigger your TDS CSA 8000 series sampling oscilloscope or as an input to a spectrum analyzer or network analyzer to measure the frequency domain response of the...

Page 22: ...he probe SMA inputs and the Auxiliary Output connector Protect the probe circuitry by connecting the terminations to these connectors when the probe is not in use When making single ended measurements...

Page 23: ...he P7380SMA differential probe includes built in cable loss compensation when used with the cable assembly Note To make DUT connections easier connect the phase adjuster ends of the cables to the prob...

Page 24: ...XX Optional Accessories Table 3 shows the optional accessories that you can order for the P7380SMA differential probe Table 3 Optional accessories Accessory Description Phase adjuster Use two phase a...

Page 25: ...discrete test points in your circuit An assortment of circuit and grounding attachments are included to help you maintain high signal integrity For best high frequency performance the wide blade grou...

Page 26: ...the P7380SMA probe H Option D1 Calibration Data Report H Option D3 Calibration Data Report 3 years with Option C3 H Option C3 Calibration Service 3 years H Option D5 Calibration Data Report 5 years wi...

Page 27: ...fying the device and allowing the appropriate power supplies to be turned on The preamp inputs on the host instrument are ESD protected by remaining grounded until a valid TekConnect device is detecte...

Page 28: ...input connections are shown in Figure 3 50 Terminations Dual SMA cables Figure 3 Probe signal input connections SMA Connectors The SMA connectors provide a signal path through the internal 50 termina...

Page 29: ...tion voltage is driven about 10 beyond the specified 2 5 V range See Overdrive Error on page 47 for more information Probe Input Limitations Although the allowable input DC common mode VCM range and t...

Page 30: ...0 in jacks allow you to monitor the termination voltage of the signal under test using a DMM and a pair of standard DMM test leads The output impedance of the termination voltage monitor output is abo...

Page 31: ...4 Equipment required for functional checks Item description Performance requirement Recommended example1 Oscilloscope TekConnect interface Tektronix TDS6604 or TDS7704 DMM 1 0 mV resolution Fluke 87 o...

Page 32: ...he other LEDs remain unlit NOTE If the Attenuation and Termination Source LEDs do not light as described the oscilloscope may have stored different attenuation and termination source settings from a p...

Page 33: ...probe input and the Aux output connectors 4 Set the DMM to measure DC voltage and connect it to the Vterm monitor jacks using the 0 040 in to 0 080 in adapters and the 0 080 in pin to banana plug test...

Page 34: ...s completes the 12 5X attenuation signal check If you want to check the 2 5X attenuation setting of the probe do steps 8 through 11 8 Insert a 50 5X attenuator in line with the probe compensation outp...

Page 35: ...amplitude and common mode voltage is dependent on oscilloscope model Check that the signal amplitude on the oscilloscope and the common mode voltage displayed on the DMM approximate those in the tabl...

Page 36: ...tput connector 3 Connect an SMA cable from the probe Aux output to another channel on the oscilloscope using a Tektronix TCA SMA adapter See Figure 5 for the test setup You can use the other cable of...

Page 37: ...attenuation factor on the main probe output This completes the 12 5X attenuation Aux Output signal check If you want to check the 2 5X attenuation setting of the probe do step 5 Note This check requir...

Page 38: ...probe and the Aux output connector 2 Connect 50 SMA terminations to the input of the probe and the Aux output connector 3 Leave the 50 SMA termination connected to the input The test setup is shown in...

Page 39: ...r than zero See your oscilloscope manual for details on using the internal Vterm controls Ext Mode 6 Verify that the external termination voltage inputs on the probe are open 7 Use the Vterm SELECT bu...

Page 40: ...l Path Compensation routine When the Signal Path Compensation test status is pass run the probe calibration routine 3 Connect the probe to one of the oscilloscope channels and set the oscilloscope to...

Page 41: ...e The probe calibration routine runs optimizing the probe to the oscilloscope for both probe attenuation settings After the probe passes the functional checks and probe calibration routine you can use...

Page 42: ...and applications Auto Mode Figure 8 shows the probe connections for testing 50 serial data lines such as InfiniBand or PCI Express In this example Auto mode is used to automatically set the terminatio...

Page 43: ...n Figure 9 You can use a DMM to verify that the termination voltage matches the externally supplied DC control voltage To circuit under test Power supply TDS6604 Oscilloscope DMM Black Red Red Black 5...

Page 44: ...e oscilloscope using the graphical user interface This eliminates the need for an external power supply Figure 10 shows the setup Refer to your oscilloscope manual for details on using the interface T...

Page 45: ...connection can be used to connect to a spectrum or network analyzer or for generating clock recovery signals used for other instrumentation See Figure 11 Spectrum Analyzer TDS6604 Oscilloscope To circ...

Page 46: ...nix 8000 Series oscilloscope family NOTE The firmware of your 80A03 interface must be version 1 2 or higher to be compatible with your P7380SMA probe 80A05 Clock Recovery Module By adding an 80A05 Clo...

Page 47: ...CSA8000 Series Oscilloscope Data input SMA cable 80E0X module 80A03 80A05 module Dual SMA cables Circuit under test 80A03 TekConnect Probe Interface Figure 12 Using the probe with an 80A03 Interface...

Page 48: ...obe to connect between the P7380SMA probe and the P6150 probe tips Be aware of the tradeoffs between dynamic range and noise when using the 10X probe tips with the attenuation set at 12 5X Also note t...

Page 49: ...tial interconnect The signal transmitter provides a 50 source impedance from each of its two differential outputs and the signal receiver provides an effective 50 input impedance on each of its two di...

Page 50: ...additional problems Unlike the differential probe which has been carefully designed with short matched input signal paths a pseudo differential measurement uses two oscilloscope channels which are ph...

Page 51: ...n SMA input probe like the P7380SMA has a very different input structure It has a dual matched 50 input that is designed to terminate the measured signal transmission path with minimum reflections It...

Page 52: ...f each complementary input signal Vout VDM VDM Vout 2ADM VDM ADM CM V Figure 14 Simplified model of a differential amplifier Common Mode Rejection Ratio In reality differential amplifiers cannot rejec...

Page 53: ...ock Diagram Simplified The SMA inputs and probe termination network provide a high frequency 50 signal path to the internal probe amplifier The use of SMA female connectors provides a reliable repeata...

Page 54: ...a guideline in custom cable designs and is valid over a frequency range of about 1 GHz to 8 GHz Loss 0 5dB 0 15dB F 1 where F is frequency in GHz Custom cable pairs must also be designed with very low...

Page 55: ...M 1 When inputs are AC coupled VI VT II 0 IT 16 67 mA x VT The probe block diagram shows that the input termination network is followed by an attenuator and VCM compensation circuit The attenuator is...

Page 56: ...C peak AC between each input and ground In addition the maximum termination resistor power must not be exceeded to avoid probe damage Maximum Termination Resistor Power The internal termination resist...

Page 57: ...l source model defined for these equations is as fol lows V and V V VCM VDM V VCM VDM Single ended signals into a 50 load This results in the terms to be used in the power equations above VCM V V 2 VT...

Page 58: ...may produce an erroneous output waveform even when the differential mode specification is met Differential Mode Signal Range The differential mode signal range is the maximum voltage difference betwe...

Page 59: ...n to the common mode gain The higher the ratio the greater the ability to reject common mode signals For additional information about CMRR see page 36 Probe Amplifier Outputs The P7380SMA probe has a...

Page 60: ...RM Driver EXT VTERM Input Figure 18 Termination voltage network drive The P7380SMA probe has been designed for compliance testing of high speed serial data standards such as PCI Express InfiniBand Ser...

Page 61: ...onnect interface oscilloscopes You can adjust the DC termination voltage within the 2 5 V range See your oscilloscope manual for details on using this mode Ext Mode When the probe is in external mode...

Page 62: ...network by the Vterm driver can be monitored with a DMM on a pair of 0 040 inch pin jacks on the top of the probe This allows you to verify the termination voltage setting and when you are using Auto...

Page 63: ...cific voltage difference between VCM and VT is dependent on both the source impedance and the VCM and VT values You can use the input termination network table on page 39 to determine allowable condit...

Page 64: ...this figure includes a termination capacitor This is intended to show that the termination network provides a broadband AC ground for common mode signals 50 50 V out IN IN VDM 50 50 V V VT V CM VIP V...

Page 65: ...8VDM The inverted polarity of the probe amplifier output can be verified by examining the probe Aux Output signal The main probe output signal is routed through the TekConnect interface connector and...

Page 66: ...ak voltage because that best represents the way in which the signal is typically displayed and specified for compliance testing Single Ended Measurement Topology Although the P7380SMA differential pro...

Page 67: ...this topology show that varying the termination voltage VT affects the DC loading on the signal source but does not affect the measured DC voltage The measured single ended DC voltage also represents...

Page 68: ...the probe negative input 50 50 V out IN IN VDM 50 V V VT VCM VIP VIN VIN 0 VIP VDM 2 VCM VT 2 VO VIP VIN x AV IL VCM VIP 50 DC loading on VCM source AV 0 40 for 2 5X 0 08 for 12 5X Atten VCM comp VO...

Page 69: ...has a greater risk of exceeding the probe dynamic range and overdriving the probe amplifier Open Input Another alternative single ended measurement topology is shown in Figure 23 In this case the inpu...

Page 70: ...Voltage Monitor output pins Note that measuring the common mode input voltage on the single ended signal using this topology is more accurate than using a differential measurement topology where the...

Page 71: ...be within the input dynamic range of the probe to be measured accurately The specified dynamic range for differential signals which is expressed as a differential peak to peak voltage can be converted...

Page 72: ...factoring the impact on measurement accuracy The increase in attenuation also brings an increase in noise Extending the Input Connections At times it may be necessary to extend the probe inputs with...

Page 73: ...he cables to a Tektronix 80E04 Sampling Head configured for a TDR output Figure 24 shows a typical setup for checking the skew 1 Turn on the equipment and let it warm up for 20 minutes Do not connect...

Page 74: ...justing Cable Skew If you want to minimize the skew introduced by cable pairs other than those supplied with the probe you can use a pair of phase adjusters see Optional Accessories on page 8 to bring...

Page 75: ...he adjuster connected to the other cable with the shorter delay 4 While observing the oscilloscope display turn the collar on the phase adjuster counterclockwise to increase the delay 5 When the displ...

Page 76: ...oscilloscope channel and probe connected to that channel to the time delay of other channel probe pairs of the oscilloscope If you need to deskew more than two probes keep one deskewed probe connecte...

Page 77: ...Figure 26 Deskewing two P7380SMA probes 4 Display the channel s that you want to deskew 5 Push the AUTOSET button on the instrument front panel 6 Turn averaging on to stabilize the display 7 Adjust ve...

Page 78: ...nt to deskew to Channel 1 NOTE If possible do the next step at a signal amplitude within the same attenuator range vertical scale as your planned signal measurements Any change to the vertical scale a...

Page 79: ...andard Data Rate Vdm_max Vdm_min Vcm_max Vcm_min InfiniBand TX 2 5 Gb s 1 6 V 1 0 V 1 0 V 0 5 V InfiniBand RX 2 5 Gb s 1 6 V 0 175 V 1 0 V 0 5 V PCI Express TX 2 5 Gb s 1 2 V 0 8 V AC AC PCI Express R...

Page 80: ...n in the Figure 27 example the differential output parameter is specified as a peak to peak voltage difference and thus the signal swing on each pin of the driver is half that value The Vdiff signal s...

Page 81: ...hecks in the Performance Verification section are marked with the n symbol Table 8 Warranted electrical characteristics Characteristic Description n Differential rise time 10 90 probe only Main output...

Page 82: ...erformance Table 9 Typical electrical characteristics Characteristic Description Differential bandwidth probe only Main output Aux output DC to 8 GHz 3 dB DC to 8 GHz 6 dB Differential rise time 20 80...

Page 83: ...50 dB to 100 MHz 35 dB to 1 GHz 20 dB to 5 GHz 15 dB to 8 GHz Common mode rejection ratio Aux output 45 dB to 100 MHz 35 dB to 1 GHz 20 dB to 5 GHz 15 dB to 8 GHz Linearity 1 or less of dynamic range...

Page 84: ...0 625 mV C or less 12 5 X displayed on screen DC voltage measurement accuracy referred to input 2 of input 6 25 mV 6 25 mV 2 5 X 2 of input 31 25 mV 30 0 mV 12 5 X gain error 2 of input voltage outpu...

Page 85: ...typical differential input return loss and differential mode bandwidth plots for the probe 60 dB 100 MHz 1 GHz 10 GHz 55 50 45 40 35 30 25 20 Figure 29 Typical differential input return loss 19 22 25...

Page 86: ...al Probe Instruction Manual Figures 31 and 32 show a typical eye pattern of an InfiniBand signal and the typical step response as measured with the probe Figure 31 Typical eye pattern from an InfiniBa...

Page 87: ...nd Termination voltage buffer input resistance 100 K Termination voltage output monitor DC two 0 040 in jacks and Termination voltage output monitor resistance 1 K Output coupling and termination DC t...

Page 88: ...cs Cont Shipping weight includes shipping materials 1 38 kg 3 1 lb Standard cable assembly length 0 96 m 38 in 129 50 mm 5 10 in 31 8 mm 1 30 in 24 13 mm 0 950 in 7 95 mm 0 313 in 6 10 mm 0 240 in 48...

Page 89: ...ent required to verify the performance of your probe Table 12 Equipment required for performance verification Item description Performance requirement Recommended example1 Oscilloscope TekConnect inte...

Page 90: ...012 0039 00 Test leads 0 080 in pin to Banana plug ends one each color 012 1674 00 red 3 012 1675 00 black 3 Adapters 3 SMA 50 termination 015 1022 003 Adapter SMA short circuit 015 1020 003 Adapters...

Page 91: ...ing pages TekConnect to SMA Adapter The TekConnect to SMA Adapter Tektronix part number TCA SMA allows signals from an SMA cable or probe to be connected to a TekConnect input See Figure 34 Connect an...

Page 92: ...80E0X module to the 80A03 TekConnect probe interface 3 Connect the 80E04 module to channels 7 and 8 of the TDS8000 oscilloscope 4 Connect a 50 termination to the Aux Output connector on the probe and...

Page 93: ...with its measurement leads connected together on the lowest scale that can measure 100 4 Measure the resistance and write down the value 5 Reverse the DMM connections and repeat the measurement Write...

Page 94: ...puts are open circuit or below a 50 mV threshold If the LED continues to flash after you connect the inputs cycle the mode SELECT button Ext Mode The Ext mode test setup is shown in Figure 37 1 Plug t...

Page 95: ...oltage that you measured in the previous step 7 Repeat steps 5 and 6 for the 2 500 volt and 2 500 volt input values listed in the test record Int Mode If your oscilloscope supports internal mode use t...

Page 96: ...and 2 500 volt test values 1 Connect the test setup as shown in Figure 38 SMA to BNC adapters Power supply TDS6604 Oscilloscope BNC T adapter P7380SMA probe BNC to Dual Banana adapter BNC cable Matche...

Page 97: ...sure the output voltage at the termination voltage monitor jacks on the top of the probe Record this voltage as Vout on the test record and verify that the Vout voltage is within the specified limits...

Page 98: ...probe SMA inputs on the probe and plug the probe into the 80A03 module BNC to Dual Banana adapter 50 Precision termination DMM BNC SMA adapter BNC Cable 50 Terminations TDS CSA 8000 Series Oscillosco...

Page 99: ...2 Connect the probe to the power supplies as shown in Figure 40 Make sure the ground tabs on the BNC to dual banana plug adapters are connected to the ground connections on the power supplies Monitor...

Page 100: ...r supplies Leave the DMM leads connected to the adapters 6 Connect the BNC to dual banana plug adapters into the opposite power supplies to reverse the voltage polarity to the probe inputs See Figure...

Page 101: ...d The probe rise time is calculated using the two measurements This test uses the TDR function of the 80E04 sampling head as a fast rise time signal source A second 80E0X sampling head is used to take...

Page 102: ...5X probe test only CH 8 TDR pulse source 80E04 Module TekConnect to SMA Adapter 80E0X Module 80A03 TekConnect Probe Interface CH 4 measurement channel Matched SMA M to M cables Semi rigid SMA cable Fi...

Page 103: ...Set the Preset of Channel 7 and 8 on TDR Preset sets Internal Clock in the Trigger menu turns on the TDR Step in the TDR Setups menu turns on the channel and selects the acquisition Units in the TDR S...

Page 104: ...measured from the 10 and 90 amplitude points on the waveform Record the rise time as ts The following steps instruct you to assemble the test setup that includes the probe as shown in Figure 44 The sy...

Page 105: ...center horizontal graticule lines 19 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...

Page 106: ...Vin 2 mV Vin 2 500 V Vin 7 mV Vin______Vout______ Vin 7 mV Vin 2 500 V Vin 7 mV Vin______Vout______ Vin 7 mV Int Mode Vin 0 000 V 0 002 V Vout 0 002 V Vin 2 500 V 2 4905 V Vout 2 5095 V Vin 2 500 V 2...

Page 107: ...SMA probe compatibiity issues Symptom Likely cause Int mode for Vterm does not display a control window on the oscillo scope The oscilloscope does not support this mode Instead the termination voltage...

Page 108: ...functioning normally Both Atten Dynamic Range LEDs flash after power on Internal probe fault Disconnect the probe from the oscilloscope and recon nect Overdrive LED on Input signal exceeding maximum l...

Page 109: ...lution A swab is useful for cleaning narrow spaces on the probe Do not use abrasive compounds on any part of the probe CAUTION To prevent damage to the probe avoid getting moisture inside the probe du...

Page 110: ...rdboard shipping carton having inside dimensions at least one inch greater than the probe dimensions The box should have a carton test strength of at least 200 pounds 2 Put the probe into an antistati...

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