P7504 & P7506 TriMode™ Probes Technical Reference
Contents
1. CAUTION Caution statements identify conditions or practices that could result in damage to this product or other property Symbols and Terms onthe These terms may appear on the product 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 CAUTION indicates a hazard to property including the product The following symbol s may appear on the product A CAUTION Refer to Manual vi P7504 amp P7506 TriMode Probes Technical Reference Preface This manual discusses topics that are not covered in depth in the P7504 amp P7506 TriMode Probes Quick Start User Manual The main sections are m Theory of Operation Contains probe details not covered in the user manual Reference Contains information about differential measurements and how to increase measurement accuracy Specifications Contains warranted typical and nominal characteristics for the probe and probe tip accessories B User Service Describes troubleshooting and probe maintenance Products Covered The table below lists the TriMode probes covered by this manual Table i TriMode probes Probe model Serial number P7504 All P7506 All P7504 amp P7506 TriMode Probes Technical Reference vii Preface Vill P7504 amp P7506 TriMode Probes Technical Reference Theory of Operation This2. Probe positioner or bench Able to hold probe PPM203B or PPM100 vise 1 Nine digit part numbers xxx xxxx xx are Tektronix part numbers P7504 amp P7506 TriMode Probes Technical Reference User Service Replacing probe body The bullet contacts in the probe body should be replaced every 200 insertion bullet contacts cycles Follow these steps to replace the bullets by using the removal tool Remove 1 Squeeze the tool plunger to extend the holder tangs 2 Insert the tool into the probe body so that the holder tangs surround one of the bullets 3 Release the plunger to secure the holder tangs on the bullet 4 Gently pull the tool outward to remove the bullet 5 Repeat for the other bullet CAUTION Ifyou cannot extract the bullets with the bullet removal tool use fine needle nosed pliers and a magnifying glass or microscope Be careful not to damage the probe body with the pliers 2158 017 Figure 42 Removing the bullets P7504 amp P7506 TriMode Probes Technical Reference 45 User Service Install When both bullets have been removed install new bullets by doing the following Squeeze the tool plunger to extend the holder tangs Insert a new bullet into the tool so that the holder tangs surround the bullet Release the plunger to secure the holder tangs on the bullet Insert the tool into the probe body and seat the bullet in the recess Squeeze the tool plunger to release the bullet Gently pull th
3. P7504 amp P7506 TriMode Probes Technical Reference Theory of Operation Embedded Probe Itis possible to acquire signals with the P7500 Series TriMode probes by including an embedded connection in your circuit See Figure 22 Connectors that mate to the P75TC Tip Cable can be incorporated in the circuit board design and carefully placed to balance any reflections or other characteristics that may affect the circuit or measurement An embedded probe connection will generally provide optimum probe performance because the signal interconnect lead length can be minimized if implemented correctly For more information about embedded probe connections contact Tektronix 2161 043 Figure 22 Embedded probe fixture P7504 amp P7506 TriMode Probes Technical Reference 17 Theory of Operation 18 P7504 amp P7506 TriMode Probes Technical Reference Reference This section contains information about taking measurements with the TriMode probes and increasing measurement accuracy Single Ended Measurements Using A and B Modes A differential probe such as the P7516 TriMode Probe can be used for single ended measurements within the limits of its dynamic and offset voltage ranges Single ended probes such as the P7240 typically have a wider offset range than differential probes but generally with lower bandwidth performance See Table 1 Table 1 Offset ranges DC Offset Dynamic Range DC Offset Dynamic Range Probe Frequency 5
4. guide to gauge the effects of probe tip spacing but actual results may vary depending on the other factors like characteristics of the device under test for example rise time and impedance and the model of probe and oscilloscope 8 200mVidiv Average 16 Value Mean Min Max SiDev Count into 24 384 acas RL 50 v 242408 24197804 2376p g amp esp iza z Stipe Dsi2sz28p 3446 3592p 1802 GD 228003 6 395 7 958 250ps 50 0GS s IT sootalpt E 200mviee son 5006006 em 7 0mv asops secs IT sootupi Run Average tG 1392 acas RL 50k Value Mean Min Max StDev Count into GD Rise 224208 24433614p 23 97p 2875p 13670 jaso GP Rise 354ps 354674560 3672p 35 9p 225 71 aso GD Ovram 5 9385 59490966 5 408 6 621 50 7m Figure 17 P75PDPM with short ground spring 0 050 in spacing P7504 amp P7506 TriMode Probes Technical Reference Theory of Operation ECD 250ps 500685 IT SOOfs pt Run Average t6 16 656 acas 568 em 200mviaiv 5 8 ED 0 250ps 500056 IT soofsipt Run Averageit Max StDev Coum Info 13920 acas RL 5 0k 8 852 e27 48 55p Figure 19 P75PDPM with short ground spring 0 180 in spacing P7504 amp P7506 TriMode Probes Technical Reference 15 Theory of Operation Input Impedance and Pr
5. might need to keep the wires as short as possible If possible use the solder tip dimensions shown in the Specifications section to lay out a matching footprint on your circuit board P7504 amp P7506 TriMode Probes Technical Reference 47 User Service P75PDPM Probing Module 48 Springs Use the following precautions when you solder the tips For best soldering results use a microscope to examine the quality of the solder joints Use a low wattage temperature controlled soldering iron and a small mass soldering iron tip The soldering iron temperature should be set as low as possible while still providing a reliable solder joint Use SAC305 solder included with the wire replacement kit to attach the tip wires to the circuit under test When replacing tip wires or axial lead resistors solder wick can be used to remove the excess solder from the probe tip circuit board via holes Be careful not to overheat the via and damage the board The attachment wires should be bent symmetrically to vary the interconnect spacing Use care when you solder a tip to a circuit under test to avoid inadvertently desoldering either the attachment wires or the damping resistor For optimum performance and signal integrity keep the lead length between the DUT Device Under Test and the tip as short as possible and the lead lengths the same length Equipment Required ground spring tool magnifying glass or microscope tweezers probe hold
6. ps 20 lt 50 ps Input mode crosstalk CMRR Channel isolation DMRR gt 60 dB at DC gt 40 dB at 50 MHz gt 40 dB at 50 MHz gt 40 dB at 50 MHz gt 25 dB at 1 GHz gt 30 dB at 1 GHz gt 30 dB at 1 GHz gt 20 dB at 3 GHz gt 25 dB at 3 GHz 225 dB at 3 GHz 215 dB at 6 GHz 220 dB at 6 GHz 220 dB at 6 GHz 36 P7504 amp P7506 TriMode Probes Technical Reference Specifications 1 65 mm 0 065 in 6 78 mm 0 267 in 1 02 mm 0 040 in E a MEN 5 J Sst X T gE 3 05 mm pa E ui ma 0 120in Z 145 80 mm 4 060 mm ra po SE 5 740 in 0 160 in AX 0 012 002 5 08 mm nr 0 200 in 11 68 mm EPA 0 470 in Figure 36 P75TLRST TriMode Long Reach Solder Tip dimensions The following figures show the typical step response of the TriMode probes with the P75TLRST solder tip A 50 ps filter was used on the pulse source for these measurements File Edit View Setup Utilities Applications Help Triggered x fe nz co aat Acq Mode Average Trig Internal Clock x frooKHe x lea x Pulse z Amplitude nnn n zw ae 2 C3 20 00mVidiv Measurement Rise C3 A 112 0022ps 200 Opsidiv 70 00mV Ic 4 20 00mp 3 pov gl van amp amp f200 000ps ER i956 3 gec 1 12 PM 12 3 2008 Figure 37 P7504 probe with the P75TLRST solder tip P7504 amp P7506 TriM
7. section discusses operating considerations and probing techniques For more detailed information about differential measurements and TriMode operation refer to Reference See page 19 The P7500 Series TriMode probes are optimized for high bandwidth they are not general purpose probes The probe tips are miniaturized for electrical characteristics and access to dense circuitry and must be handled carefully A CAUTION To prevent damage to the probe use care when handling the probe Rough or careless use can damage the probe Input Voltage Limits The P7500 Series TriMode probes are designed to probe low voltage circuits Before probing a circuit take into account the limits for maximum input voltage the operating voltage window and the differential mode signal range See Table 4 on page 25 Maximum Input Voltage The maximum input voltage is the maximum voltage to ground that the inputs can withstand without damaging the probe input circuitry AN CAUTION To avoid damaging the inputs of the probes do not apply more than 15 V DC peak AC between each input or between either probe input and ground CAUTION To avoid ESD electrostatic discharge damage to the probe always use an antistatic wrist strap and work at a static approved workstation when you handle the probe P7504 amp P7506 TriMode Probes Technical Reference 1 Theory of Operation Operating Voltage Window Differential Mode Signal Rang
8. square pin header is mounted on a small circuit board which provides circuit connections for a pair of input signal pickoff resistors and a ground via for wiring to the DUT As shown in the illustration this probe tip design includes a ground via at the probe tip to provide a TriMode connection P7504 amp P7506 TriMode Probes Technical Reference Theory of Operation Figure 6 High Temp solder tip This 3 pin interface topology is signal ground signal S G S with the ground connection between the signals for isolation The DUT connection interface at the probe tip vias uses a split resistor topology with axial leaded resistors rather than wires for the DUT interconnect Micro Coax Solder Tip This leave behind probe tip includes a mating cable assembly with a 3 pin header for connecting to one of the socket cables The cable connection between the square pin header and the probe tip signal pickoff resistors is a very flexible micro coax cable A TriMode connection can be made by adding a ground wire between a ground via on the probe tip circuit board and a local DUT ground giving a single ended return current path along the coaxial cable shield and through the center pin of the square pin header The split resistor topology used on the High Temp tip is also used on the Micro Coax tip as shown in the illustration Replaceable axial leaded resistors located at the probe tip are used for DUT c
9. with attached G3PO connector bullets The connector bullets are a part of the G3PO connector design providing a self aligning interconnect mechanism between G3PO connectors The G3PO connector in the probe body is designed to have higher detent force than the probe tip connectors which is intended to ensure that the G3PO bullets remain in the probe body connector when disconnected The probe body nose piece with its integral spring mechanism helps to provide a self aligning mechanism for hand P7504 amp P7506 TriMode Probes Technical Reference 9 Theory of Operation 10 insertion of the probe tip The probe body nose springs also give a secure capture of the probe tip connector after insertion Release of the probe tip is assisted by using the wire connected cable release holder on the probe tip connector This probe tip release holder should always be used rather than pulling on the probe tip cables which may cause tip cable damage DUT Connections The lead length of the resistor leads and connection wires between the probe tip board and the DUT must be kept as short as possible to preserve the integrity of the measured signal Typical wire lengths range from 0 010 in to 0 100 in See Figure 10 2161 042 Figure 10 Typical wire length from probe tip to circuit The following four figures illustrate the signal integrity effect on the P7STLRST solder tip when used with different lengths of tip wire Signal fidelity is best wh
10. with the probe Refer to the P7504 amp P7506 Quick Start User Manual for specific instructions The following parts may need to be replaced due to normal wear and damage When you replace these components secure the probe in a small vise or positioner to simplify the procedure Table 12 TriMode probes replaceable parts Description Replacement part number Probe body bullet contacts 013 0359 xx kit of 4 P75TLRST solder tip wires 020 2754 xx Wire Replacement Kit includes one bobbin each 4 mil wire 8 mil wire and SAC305 solder TriMode Resistor 020 2936 xx amp TriMode Extended Resistor 020 2944 xx solder tip resistors 020 2937 xx Replacement Resistor Kit includes 50 each 100 Q leaded resistors 75 Q surface mount resistors nonconductive tubing P75PDPM Probing Module springs 016 1998 xx kit of 4 large springs 016 1999 xx kit of 4 small springs P75PMT Probing Module tips left and right P75PMT one pair P75TC Probing Module Tip Cable P75TC qty 1 Refer to the user manual for a list of the accessories that are available for your probe Table 13 Required equipment Description Minimum requirement Recommended example Bullet removal tool Custom tool 003 1896 xx Connector separator tool Custom tool 003 1897 xx Ground spring tool Custom tool 003 1900 xx Tweezers General purpose Magnifying glass or Free standing to allow microscope hands free use
11. 5 005 Figure 33 Damped Wire Pair dimensions P7504 amp P7506 TriMode Probes Technical Reference Specifications The following figures show the typical step response of the TriMode probes with the Damped Wire Pair A 50 ps filter was used on the pulse source for these measurements f E Vow Sep Uer Applets He ged nad x S nc 2 Erc 00 0ps Man poo 0000s fas Figure 35 P7506 probe with the Damped Wire Pair P7504 amp P7506 TriMode Probes Technical Reference 35 Specifications P75TLRST TriMode Long Specifications are typical and apply to all ranges and input modes unless specified Reach Solder Tip otherwise Table 10 P75TLRST TriMode Long Reach Solder Tip specifications Measurement mode Differential Single ended Common A B A Gnd B Gnd A B 2 Gnd Input impedance 430 0 at 1 GHz 215 0 1 GHz 215 Q at 1 GHz 350 0 at 3 GHz 175 Q at 3 GHz 175 0 at 3 GHz 220 0 at 6 GHz 110 0 at 6 GHz 110 Q at 6 GHz P7504 Bandwidth 24 0 GHz Rise time 10 90 lt 105 ps 20 80 lt 70 ps Input mode crosstalk CMRR Channel isolation DMRR gt 60 dB at DC gt 40 dB at 50 MHz gt 40 dB at 50 MHz gt 40 dB at 50 MHz gt 25 dB at 1 GHz gt 30 dB at 1 GHz gt 30 dB at 1 GHz gt 20 dB at 2 GHz gt 25 dB at 2 GHz gt 28 dB at 2 GHz gt 15 dB at 4 GHz gt 20 dB at 4 GHz gt 25 dB at 4 GHz P7506 Bandwidth gt 6 0 GHz Rise time 10 90 lt 75
12. 5 V Linearity 5X 1 over a dynamic range of 0 75 V to 0 75 V 12 5X 1 over a dynamic range of 1 75 V to 1 75 V Offset voltage range Differential 1 5 V to 2 5 V Single ended and 1 8 V to 34 V common mode Offset scale accuracy Differential 0 093 2 referred to input Single ended and common mode 0 186 2 referred to input DC offset drift Differential 100 yV C 5X at probe output 60 uV C 12 5X at probe output Single ended and 100 uV C 5X at probe output common mode 30 uV C 12 5X at probe output DC voltage 5X 2 of input 2 of offset 15 mV 7 5 mV measurement 12 5X 2 of input 2 of offset 37 5 mV 17 5 mV accuracy Maximum nondestructive input voltage 15 Voc peak ac between each input or between either probe inputs and ground Input impedance Differential 430 Q at 1 GHz 430 Q at 1 GHz 400 Q at 4 GHz 400 0 at 6 GHz Single ended 215 Q at 1 GHz 215 Q at 1 GHz 200 Q at 4 GHz 200 Q at 6 GHz Common mode 215 Q at 1 GHz 215 Q at 1 GHz 200 0 at 4 GHz 200 Q at 6 GHz Differential input resistance DC coupled 100 kO 6 kO Input resistance matching 250 Q side to side with respect to ground Common mode input resistance DC coupled 50 kQ 3 0 Common mode rejection ratio gt 60 dB at DC gt 60 dB at DC differential mode 1 gt 40 dB to 50 MHz gt 40 dB to 50 MHz gt 30 dB to 1 GHz gt 30 dB to 1 GHz gt 28 dB to 2 GHz gt 25 dB to 3 GHz gt 25 d
13. 7500 Series TriMode Probes is shown in graphs assuming a sinusoidal common mode signal A quick way to assess the magnitude of CMRR error when the common mode signal is not sinusoidal is to connect both leads to the same point in the circuit The oscilloscope displays only the common mode component that is not fully rejected by the probe While this technique may not give you accurate measurements it does allow you to determine if the magnitude of the common mode error signal is significant Make the probe tip wires the same length to maximize the probe CMRR The lower the input impedance of the probe relative to the source impedance the lower the CMRR for a given source impedance imbalance Differences in the source impedance driving the two inputs lowers the CMRR Note that single ended measurements generally result in asymmetric source impedances which tend to reduce the differential mode CMRR When making common mode signal measurements A B 2 GND with the TriMode probe it is desirable to reject the differential mode signal present between the two inputs This rejection is expressed as the Differential Mode Rejection Ratio DMRR and is defined as the common mode gain Acu divided by the differential mode gain Apy It is expressed either as a ratio or in dB and degrades at higher frequencies E dB 20log om DM DM DMRR P7504 amp P7506 TriMode Probes Technical Reference Reference Serial Bus Standards The
14. B to 4 GHz gt 20 dB to 6 GHz P7504 amp P7506 TriMode Probes Technical Reference 25 Specifications Characteristic Specification applies to all models unless specified otherwise P7504 P7506 Differential mode rejection ratio gt 40 dB to 50 MHz gt 40 dB to 50 MHz common mode 1 gt 30 dB to 1 GHz gt 30 dB to 1 GHz gt 28 dB to 2 GHz gt 25 dB to 3 GHz gt 25 dB to 4 GHz gt 20 dB to 6 GHz Channel isolation single ended mode 1 gt 40 dB to 50 MHz gt 40 dB to 50 MHz gt 30 dB to 1 GHz gt 30 dB to 1 GHz gt 25 dB to 2 GHz gt 24 dB to 3 GHz gt 20 dB to 4 GHz gt 18 dB to 6 GHz Noise 5X 33 nV Hz 12 5X 48 nV V Hz Delay time 5 76 ns 0 1 ns 1 Embedded probe only Refer to Tip Specifications for specifications when using TriMode accessory tips See page 28 Tip Specifications Table 5 Typical mechanical characteristics Characteristic Description Dimensions control box 125 4 mm x 41 mm x 35 mm 4 9 in x 1 6 in x 1 4 in Dimensions probe body 101 6 mm x 8 89 mm x 19 mm 4 0 in x 0 350 in x 0 750 in Dimensions probe length 1 3 m 51 6 in end to end with no accessories attached Unit weight 1 86 kg 4 1 Ibs probe accessories and packaging 30 5 mm 1 200 in 19 05 mm 0 750 in i LRS X om 12543 mm emt 60 mm ve o 4 938 in 4 00 in d 8 89 mm 0 350 in Figure 26 Probe body and control box dimensions 1 60 in 0135 008 26 P7504 amp P7506 TriMo
15. P7504 Bandwidth 24 0 GHz 23 0 GHz 22 5 GHz Rise time 10 90 lt 110 ps lt 125 ps lt 150 ps 20 80 lt 75 ps lt 85 ps lt 100 ps Input mode crosstalk CMRR Channel isolation DMRR gt 60 dB at DC gt 40 dB at 50 MHz gt 40 dB at 50 MHz gt 40 dB at 50 MHz gt 15 dB at 1 GHz gt 30 dB at 1 GHz gt 30 dB at 1 GHz gt 10 dB at 3 GHz 1 gt 20 dB at 2 5 GHz 1 gt 25 dB at 2 GHz gt 20 dB at 4 GHz P7506 Bandwidth gt 5 5 GHz gt 3 0 GHz gt 2 5 GHz Rise time 10 90 lt 80 ps lt 120 ps lt 150 ps 20 80 lt 55 ps lt 80 ps lt 100 ps Input mode crosstalk CMRR Channel isolation DMRR gt 60 dB at DC gt 40 dB at 50 MHz gt 40 dB at 50 MHz gt 40 dB at 50 MHz gt 25 dB at 1 GHz gt 30 dB at 1 GHz gt 35 dB at 1 GHz gt 10 dB at 3 GHz gt 20 dB at 2 5 GHz 1 225 dB at 3 GHz 215 dB at 6 GHz 1 Probe tip BW limited P7504 amp P7506 TriMode Probes Technical Reference 31 Specifications 75mm ud 0 295 in 38 mm 7 mm 0 015 in lt 0280 in 3 8mm 0 150 in y HH o 2mm 0 075 in O A 0 012 002 SS 0 48 in 5mm 7 7 0 2 in 0135 002 Figure 30 High Temp solder tip dimensions 32 The following figures show the typical step response of the TriMode probes with the High Temp solder tip A 50 ps filter was used on the pulse source for these measurements File Edit View Setup Utilities Applications Help
16. P7504 amp P7506 TriMode Probes Technical Reference Tektronix S 077 0135 00 P7504 amp P7506 TriMode Probes Technical Reference www tektronix com Tektronix 077 0135 00 S 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 TriMode is a trademark of Tektronix Inc Velcro is a registered trademark of Velcro Industries B V G3PO is a trademark of Corning Gilbert 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 n 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 any such product proves defective during this warranty period Tektronix at its option either wi
17. Triggered Tektronix x fe nz 2 rasta Acq Made Average Tiig Intemal Clock 100k9z z App Pulse fAmpitude na nnn 7 s zw C3 20 00 Measurement Rise C3 J 103 0815ps 200 Ops div ea a poon gel pov BE noe EI o seen mE ec vus 127372008 Figure 31 P7504 probe with the High Temp solder tip P7504 amp P7506 TriMode Probes Technical Reference Specifications L rers ues Fe sire ncn n a a nn e noir 200 Ops Poo cope BE pe ser mie Figure 32 P7506 probe with the High Temp solder tip P7504 amp P7506 TriMode Probes Technical Reference 33 Specifications 34 Damped Wire Pair Specifications are typical and apply to all ranges and input modes unless specified otherwise The damped wires are intended for differential mode measurements only Table 9 Damped Wire Pair specifications Differential mode A B Input impedance 430 0 at 1 GHz 350 0 at 4 GHz 250 0 at 8 GHz P7504 Bandwidth 24 0 GHz Rise time 10 90 lt 105 ps 20 lt 70 ps CMRR gt 60 dB at DC gt 40 dB at 50 MHz gt 30 dB at 1 GHz gt 25 dB at 4 GHz P7506 Bandwidth gt 6 0 GHz Rise time 1 lt 75 ps 20 lt 50 ps CMRR gt 60 dB at DC gt 40 dB at 50 MHz gt 30 dB at 1 GHz gt 25 dB at 3 GHz gt 20 dB at 6 GHz 43 18 mm A P 1 700 in 4 a 0 pd 013
18. X 5X 12 5X 12 5X P7240 4 GHz 5 4 Vpp P7504 amp P7506 4 GHz amp 6 GHz 2 5 V 1 5 V 1 5 Vpp 2 5 V 1 5 V 3 5 Vpp differential mode P7504 amp P7506 4 GHz amp 6 GHz 3 44 V 1 8 V 1 5 Vpp 3 4 V 1 8 V 3 5 Vpp single ended and common mode Differential probes are ideal for a class of single ended measurements where the reference voltage is not ground a SSTL 1 2 Var VREF Vpp 2 m PECL VREF Vcc 1 3 To measure single ended signals in this class connect the B input of the P7500 TriMode Probe to Var A differential probe in these applications displays the true signal despite any AC or DC variation in Vggr from its nominal value A single ended probe displays the signal plus the variation in Veer Differential probes can also be used to make ground referenced single ended measurements on either single ended signals or differential signals like PCI Express or Serial ATA To measure ground referenced single ended signals with the handheld module connect the B input of the P7500 TriMode Probe to ground Single ended measurements on differential signals are used to measure common mode voltage and check for differential signal symmetry By using the TriMode solder tip you can easily take these measurements with one connection Cycle the Input Mode switch to display the signal that you want to view P7504 amp P7506 TriMode Probes Technical Reference 19 Reference Channel Isolation Under ideal conditions when tak
19. ables P7500 TriMode Solder Tips Signal fidelity is an indication of how accurately a probe represents the signal being measured The signal fidelity of the probe is best when the probe is applied properly to the circuit with the P7500 probe tips Recommendations for connecting the P7500 probe tips are given in the following section The Socket Cable assembly connects between the probe head and the two leave behind probe tips that ship as standard accessories with the P7504 and P7506 probes It is designed to preserve a 50 Q signal path from the input to the probe down the coaxial cable and as well as possible through the square pin connection to the solder tips LEE L ALLE a c 2573 016 The Socket Cable XL is a similar but longer cable 5 ft and is available as an optional accessory It is designed for use with the High Temp solder tip in environmental test chambers and similar applications 2573 017 The P7504 and P7506 probes include two different leave behind solder tips High Temp and Micro Coax to connect the probes to your circuit Two High Temp and four Micro Coax probe tips are shipped with the probes as standard accessories other P7500 Series solder tips are available as optional accessories All of the tips are described on the following pages High Temp Solder Tip This leave behind probe tip uses a 3 pin header with two connections for a differential signal and a third connection for a ground reference The
20. al characteristics Warranted Characteristics Table 3 Warranted electrical characteristics Warranted characteristics describe guaranteed performance within tolerance limits or certain type tested requirements Characteristic Specification applies to all models unless specified otherwise P7504 P7506 Rise time 1 10 90 lt 105 ps lt 75 ps 20 80 lt 70 ps lt 50 ps DC attenuation accuracy 5X 0 200 2 12 5X 0 0800 2 Output Offset Zero 5X 3 mV 20 to 30 C 68 to 86 F 15 mV on oscilloscope 12 5X 3 mV 20 to 30 C 68 to 86 F 37 5 mV on oscilloscope Temperature Operating 0 to 40 C 32 to 104 F Nonoperating 20 to 71 C 4 to 160 F Humidity Operating 20 80 RH at up to 40 C 104 F Nonoperating 5 90 RH Altitude Operating 3000 meters 10 000 feet Nonoperating 12 000 meters 40 000 feet 1 Measurements taken using an embedded probe fixture and a 250 mV step 18 to 28 C 64 to 82 F 24 P7504 amp P7506 TriMode Probes Technical Reference Typical Characteristics Specifications Typical characteristics describe typical but not guaranteed performance Table 4 Typical electrical characteristics Characteristic Specification applies to all models unless specified otherwise P7504 P7506 Bandwidth 1 gt 4 GHz gt 6 GHz Operating Voltage Window 2 0 V to 4 0 V Differential signal 5X 0 750 V range DC coupled 12 5X 41
21. and Probe Loading 0 cece cece ence eee eee eme emen 16 lacum 19 Single Ended Measurements Using A and B Modes 0 ccccceeeeee ne ee eee tenet e 19 Differential Measurements irice areenan a ian ese se eme ese e ese eene nns 21 Serial Bus Standards s eere tara ee EE RE nu a asa da ERU Dead uie eoo ge es STET Tee 23 0010001008 mitica 24 Warranted 6 24 Typical 00 25 Nominal Characteristics eee c eee atatea ua cena Ee Hue TERR dag cide AE COTRA Reda ENSE e ie Ehe muta 27 Tip SPECI 28 User ia E MORERRT 43 Error E Ea a E E RAS 43 160 4660010 c 44 Preparation for Shipment CERRO m 56 P7504 amp P7506 TriMode Probes Technical Reference 1 Table of Contents List of Figures 1 Figure 1 Operating voltage window eI m m I s e heme hene 2 Figure 2 Dynamic range versus linearity 5X range 2 eee e meme 3 Figure 3 Dynamic range versus linearity 12 5X range 0 cece eee m eee 3 Figure 4 TriMode input structure 0 0 e cece ecc cece cence ence ce he e e e e e ems se ses e he eren 5 Figure 5 Typical TriMode Probe Setup screen 0 sce ccecc cece eee 5 Figure 6 High Temp solder tip idisse re Ee EE REP ebrei Free ar ei E 7 Figure 7 Micro Coax solder tip cccsecccceeecceneneeedeesencedgeceebacedeegeenaeesense
22. aused 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 Summary cidaindd atat ls ta ta ala a i a ra a a V lap vii Products Coyvered sees e eot etre re apa la etes etx Ue e adi quie uiu dau dle e ete vii Theory of Operation ss i eere rere obere at e edet DE ae Va NER RE e D HET iai Sa a pete EY s 1 Input Voltage Limits cotta a 8 das TERES PIER REED i dupaia 1 TriMode 6 diee aaa ata aaa ata oe a a NOD a aut danke hes deendaas EO OU LE ed on D da a area taia 4 Probing Techniques to Maximize Signal Fidelity sess 6 Input Impedance
23. c eee eee 22 Figure 26 Probe body and control box dimensions sess 26 Figure 27 Micro Coax solder tip dimensions esses eee 29 Figure 28 P7504 probe with the Micro Coax solder tip eee 29 Figure 29 P7506 probe with the Micro Coax solder tip eee 30 Figure 30 High Temp solder tip dimensions cesses e nee 32 Figure 31 P7504 probe with the High Temp solder tip eee 32 Figure 32 P7506 probe with the High Temp solder tip ccc ce eee nenea 33 Figure 33 Damped Wire Pair dimensions eee ene ence cence e e eme eene 34 Figure 34 P7504 probe with the Damped Wire Pair e nee 35 Figure 35 P7506 probe with the Damped Wire Pair eee 35 Figure 36 P7STLRST TriMode Long Reach Solder Tip dimensions c eee 37 Figure 37 P7504 probe with the P75TLRST solder tip 0 cece cece eee 37 Figure 38 P7506 probe with the P75TLRST solder tip eee 38 P7504 amp P7506 TriMode Probes Technical Reference Figure 39 Figure 40 Figure 41 Figure 42 Figure 43 Figure 44 Figure 45 Figure 46 Figure 47 Figure 48 Figure 49 Figure 50 Figure 51 Figure 52 Figure 53 Figure 54 Figure 55 Figure 56 Figure 57 Table of Contents P75PDPM Precision Differential Probing Module dimensions 0 ceeceeeeeeee es 40 P7504 probe with the P75PDPM probing module 0 ccc eee eee 41 P7506 probe with the P75PDPM probing module ccc eee en 41 Remo
24. de Probes Technical Reference Specifications Nominal Characteristics Nominal characteristics describe guaranteed traits but the traits do not have tolerance limits Table 6 Nominal electrical characteristics Characteristic Description Input configuration Micro Coax amp High Temp solder tips Differential two signal inputs A and B shared with single ended Single ended one each A and B signal input and at least one ground input P75TLRST solder tip Differential two signal inputs A and B shared with single ended Single ended one each A and B signal input and two ground inputs TriMode Resistor amp Extended Resistor Differential two signal inputs A and B shared with single ended solder tips Single ended one each A and B signal input and two ground inputs P75PDPM handheld module Differential two inputs A and B Damped wire pair Differential two inputs A and B Output coupling DC Output termination 500 Probe attenuation settings 5X and 12 5X P7504 amp P7506 TriMode Probes Technical Reference 27 Specifications Tip Specifications Micro Coax Solder Tip This section lists specifications that are applicable to the probe when used with the accessory tips available for the TriMode probes Specifications are typical and apply to all ranges and input modes unless specified otherwise Table 7 Micro Coax solder tip specifications Measurement mode Differential S
25. e Offset Voltage Range The operating voltage window defines the maximum voltage that you can apply to each input with respect to earth ground without saturating the probe input circuitry A common mode voltage that exceeds the operating voltage window may produce an erroneous output waveform even when the differential mode specification is met P7504 amp P7506 I 45V 5X yi 4 0 V A 12 5 X J 35V 20V Y Y 0135 004 Figure 1 Operating voltage window The differential mode signal range is the maximum voltage difference between the A and B inputs that the probe can accept without distorting the signal The distortion from a voltage that exceeds this maximum can result in a clipped or otherwise inaccurate measurement The P7500 Series probes have two attenuation settings 5X and 12 5X that allow dynamic range to be traded off against signal noise The 12 5X attenuator setting has the largest dynamic range the 5X attenuator setting has the lowest noise The graphs on the following pages illustrate the linearity error over the dynamic voltage range of the probes in both attenuation settings The Offset Voltage Control accessible from the attached oscilloscope user interface allows the probe dynamic range to be effectively moved up and down within the limits of the offset voltage range and the operating voltage window When the offset voltage is set to zero volts and the input signal is zero v
26. e tool out of the probe body Repeat for the other bullet woo GU de cun P UE Test that the bullets are installed correctly by connecting and then removing an accessory solder tip to the probe head Inspect the probe head and verify that the bullets remain seated in the probe head 2158 025 Figure 43 Installing the bullets 46 P7504 amp P7506 TriMode Probes Technical Reference User Service P75TLRST Solder Tip The solder vias on the circuit board at the end of the P7STLRST Solder Tip are Wires X small 0 012 in and require small wires to attach to your circuit Use the 4 mil and 8 mil wires included with the Wire Replacement kit to make the connections Because of the small dimensions the solder tips have a limited number of solder cycles that the vias can withstand before the Solder Tips become unusable If you expect to make frequent soldering changes consider using the optional TriMode Resistor solder tips The resistors that extend off of these tips can accept a higher number of solder cycles and can be replaced when necessary NOTE Axial leaded tip resistors included in the TriMode resistor replacement kit Tektronix part number 020 293 7 XX should not be used in place of wires with the P75TLRST probe tip unless the surface mount SMD0402 resistors are also changed The total probe tip resistance for the P7500 Series probes is designed to be 175 Q AN CAUTION To prevent damage to the circui
27. en the wire length is kept as short as possible The step generator that was used as a signal source for these screenshots has a 30 ps 10 90 rise time The table in each figure contains data for two rise time measurements 10 90 and 20 80 and were made using a P7516 probe Comparable measurements made using a P7504 or P7506 probe would show much slower rise times These screenshots can be used as a rough guide to gauge the effects of wire length but actual results may vary depending on the other factors like characteristics of the device under test for example rise time and impedance precision of the solder connection and the model of probe and oscilloscope P7504 amp P7506 TriMode Probes Technical Reference Theory of Operation TT E 200mviaiv 0 68 Value onse Bite Figure 12 P75TLRST solder tip with 0 050 in of tip wire P7504 amp P7506 TriMode Probes Technical Reference 11 Theory of Operation 12 GP 156mv 250ps 500688 IT S00fsipt Run Average t6 224 acas RL 5 0k Figure 13 P75TLRST solder tip with 0 100 in of tip wire 250ps 0 06 s IT 00fs pt Ron Average t6 StDev Count info 4944 acas 6 asp usw too Figure 14 P75TLRST solder tip with 0 200 in of tip wire P7504 amp P7506 TriMode Probes Technical Reference Theo
28. er 2161 04 Figure 44 Large and small springs installed P7504 amp P7506 TriMode Probes Technical Reference User Service Remove 1 Adjust the tip gap using the gap measurement tab on the spring tool Set the tool between the tip circuit boards not the tips Figure 45 Set the gap 2 Insert the ground spring tool under the top of the spring 2161 023 Figure 46 Insert tool beneath spring P7504 amp P7506 TriMode Probes Technical Reference 49 User Service 3 Rock the tool away from the tips so that the spring clears the seat edge A 2161 004 Spring seats Figure 47 Transfer spring from tip to tool 4 Gently pull the tool away the spring should come away with the tool 5 Putthe spring in the accessory container or a safe place to avoid losing the spring 50 P7504 amp P7506 TriMode Probes Technical Reference User Service Install 1 Two spring sizes are available the small spring allows 0 030 0 090 in 0 76 2 28 mm tip span the large spring allows 0 050 0 180 in 1 27 4 57 mm tip span 2 Check that the tip gap is 032 in using the gap measurement tab on the spring tool Adjust if necessary 3 Using tweezers install the spring on the tool The tool has a large and small side one for each size spring Make sure the gap in the spring is on the top of the tool as shown S23 2158 012 Figure 48 Place spring on tool 4 Set the bottom of the spri
29. fferential Probing Module dimensions 40 P7504 amp P7506 TriMode Probes Technical Reference Specifications The following figures show the typical step response of the TriMode probes with the P75PDPM probing module A 50 ps filter was used on the pulse source for these measurements Figure 41 P7506 probe with the P75PDPM probing module P7504 amp P7506 TriMode Probes Technical Reference 4 Specifications 42 P7504 amp P7506 TriMode Probes Technical Reference User Service This section covers troubleshooting and probe maintenance If your probe does not meet the specifications listed in the Specifications you can send the probe to Tektronix for repair See page 56 Preparation for Shipment Error Conditions The LEDs on the probe alert you to error or status conditions affecting the probe When the probe is functioning correctly there is a quick flash of the LEDs on the probe just after connecting to the oscilloscope If the probe LEDs flash or otherwise appear to be malfunctioning an error condition may exist LEDs Do Not Remain Lit If none of the Range or TriMode LEDs remain lit after you connect the probe a probe oscilloscope interface fault exists Perform the following steps until you clear the fault or isolate the problem Disconnect and reconnect the probe to restart the power on diagnostic sequence Connect the probe to a different channel on the oscilloscope m Disc
30. ing single ended measurements with a differential probe no part of a signal applied to one input of the probe would appear on the other input In reality some portion of the signal on one input does bleed over to the other input and this effect increases with frequency Channel isolation is a measure of how much crosstalk occurs between the two probe inputs The channel isolation is defined with S parameter measurements below where A input 81 B input S2 Output S3 A ISOLATION 20 log S32 S31 A Mode B ISOLATION 20 log S31 S32 B Mode A typical isolation plot for the P7500 series TriMode probes using an embedded probe with zero ground lead length is shown Channel isolation performance is highly dependent on probe tip attachment lead length Good channel isolation requires keeping the interconnect lead length for both signal and ground connections very short See Figure 23 eet it MT Tadd LILI ee Chi Stan 50 0000 MHz Stop 15 0000 GHz Figure 23 Typical channel isolation for P7500 Series TriMode probes 20 P7504 amp P7506 TriMode Probes Technical Reference Reference Differential Measurements A differential probe is optimized to measure high speed differential signals Differential signals are formed from two complementary signals with a common reference voltage See Figure 24 Devices designed for differential measurements avoid problems prese
31. ingle ended Common A B A Gnd B Gnd A B 2 Gnd Input impedance 430 Q at 1 GHz 215 0 1 GHz 215 Q at 1 GHz 300 0 at 2 GHz 160 Q at 2 GHz 160 0 at 2 GHz 250 0 at 4 GHz 125 0 at 4 GHz 125 0 at 4 GHz P7504 Bandwidth gt 3 5 GHz gt 2 0 GHz gt 1 5 GHz Rise time 10 90 lt 120 ps lt 180 ps lt 220 ps 20 80 lt 80 ps lt 120 ps lt 150 ps Input mode crosstalk CMRR Channel isolation DMRR gt 60 dB at DC gt 40 dB at 50 MHz gt 40 dB at 50 MHz gt 40 dB at 50 MHz gt 15 dB at 1 GHz 230 dB at 1 GHz 230 dB at 1 GHz 225 dB at 2 GHz 220 dB at 4 GHz gt 10 dB at 2 5 GHz gt 25 dB at 1 5 GHz P7506 Bandwidth gt 4 0 GHz gt 2 0 GHz gt 1 5 GHz Rise time 10 90 lt 120 ps lt 180 ps lt 200 ps 20 80 lt 80 ps lt 120 ps lt 150 ps Input mode crosstalk CMRR Channel isolation DMRR gt 60 dB at DC gt 40 dB at 50 MHz gt 40 dB at 50 MHz gt 40 dB at 50 MHz gt 15 dB at 1 GHz gt 30 dB at 1 GHz gt 30 dB at 1 GHz gt 25 dB at 2 GHz gt 20 dB at 4 GHz gt 10 dB at 2 5 GHz gt 25 dB at 1 5 GHz 1 Probe tip BW limited 28 P7504 amp P7506 TriMode Probes Technical Reference 5 6mm 38 mm 0 220 in 0 015 in 7 0285 in Specifications 7 mm y n 3 4 mm 6 HH Ho o 0 134 in 47 5 mm 8 mm 0 034 in 3X 5 21 i d 1 594 in 0135 001 Figure 27 Micro Coax solder tip dimensions The foll
32. l Reference 53 User Service Remove 1 Disconnect the Cable Tips See page 53 P75TC Probing Module Tip Cable Remove the spring See page 48 P75PDPM Probing Module Springs Adjust the tip gap to maximum width B m Use the connector separator tool or a small screwdriver to pry the board up from the bottom The bottom tabs are designed to flex the top tabs are not 2161 019 Figure 54 Removing the tip 5 Repeat for the other tip Install 6 Separate the new tip board pair by snapping the board against a sharp edge Figure 55 Separating the tip board pair 54 P7504 amp P7506 TriMode Probes Technical Reference User Service 7 Select the correct board left or right and seat the board in the top tabs The board is notched to align it to the tip body 2161 010 Figure 56 Seating the tip in the top tabs 8 Press the bottom of the board to snap it past the bottom tabs 2161 020 Figure 57 Snapping the tip into the bottom tabs 9 Repeat steps 7 and 8 for the other tip 10 Attach the spring See page 48 P75PDPM Probing Module Springs 11 Reattach the cable pair P7504 amp P7506 TriMode Probes Technical Reference 55 User Service Preparation for Shipment 56 If the original packaging is unfit for use or not available use the following packaging guidelines 1 mu 00 7 Use a corrugated cardboard shipping carton having inside dimensions at least one inch greater
33. ll 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 from improper use or connection to incompatible equipment c to repair any damage or malfunction c
34. mylar tape will generally provide stronger attachment if room is available at the DUT TriMode Resistor Solder Tips These solder tips separate the standard 175 Q on board damping resistors for each probe input and into two components A surface mount 75 Q resistor is board mounted in series with a 100 Q leaded resistor that extends off of the tip board The other end of the resistor is soldered to your circuit The TriMode Extended Resistor solder tips allow a longer tip reach to your circuit under test but reduce the measurement quality 5 Extended resistor 2 solder tip 2161 053 Figure 9 TriMode Resistor solder tips Since the leads of the 100 Q resistors take the repeated soldering cycles required when reusing the tip they limit the need to solder directly to the tip board extending the life of the tip The tip resistors are replaceable and are available as a kit See page 44 Replaceable Parts Probe Tip Cables and Connectors Attached to the probe tip circuit board of the P75TLRST and resistor solder tips are a pair of very low skew 1ps coaxial cables and a polarized G3PO dual connector block The G3PO connectors use a miniature high frequency design that enables quick and easy installation of the P7500 probe tips The G3PO connector block of the probe tip is inserted into the input nose piece on the end of the probe body of the P7500 family probes The probe body contains a mating polarized G3PO connector block
35. n be held manually or can be mounted for fixtured probing on an articulating probe arm using mechanical features in the holder bar The P75PDPM design features improved mechanical compliance in probe tip attachment to the DUT Mechanical compliance is a significant issue for differential probes because of the difficulty in making reliable contact with two DUT connections at the same time The reliability in making this dual point connection can be improved by a tip structure with good mechanical compliance in which there is sufficient give in the probe tips to absorb interconnect surface irregularity The P75PDPM does not have a local DUT ground connection because of the great difficulty in making a good three point interconnect without soldering As a result the only low noise TriMode Input Mode available with the P75PDPM is the A B DIFF mode since for differential signals there is an inherent virtual ground present in the measurement circuit P7504 amp P7506 TriMode Probes Technical Reference 13 Theory of Operation 14 The following four figures illustrate the signal integrity effect of changing the spacing on the P75PDPM Probing Module Signal fidelity is best with the tips at the smallest spacing The step generator that was used as a signal source for these screenshots has a 30ps 10 90 rise time The table in each figure contains data for two rise time measurements 10 90 and 20 80 These screenshots can be used as a rough
36. ncenaeeagegerseenes 7 Figure 8 P7STLRST TriMode Long Reach Solder Tip eee eee 8 Figure 9 TriMode Resistor solder tips I II se me me emere 9 Figure 10 Typical wire length from probe tip to circuit e 10 Figure 11 P75TLRST solder tip with 0 010 in of tip wire eee 11 Figure 12 P75TLRST solder tip with 0 050 in of tip wire 6 eee 11 Figure 13 P75TLRST solder tip with 0 100 in of tip wire ssssssesssses 12 Figure 14 P7STLRST solder tip with 0 200 in of tip wire cc eee 12 Figure 15 P75PDPM Precision Differential Probing Module sese 13 Figure 16 P75PDPM with short ground spring 0 030 in spacing isses 14 Figure 17 P75PDPM with short ground spring 0 050 in spacing isses 14 Figure 18 P75PDPM with short ground spring 0 090 in spacing isses 15 Figure 19 P75PDPM with short ground spring 0 180 in spacing cccece cence eee eeeeeeee eae 15 Figure 20 TriMode probe input model 00 c ccc cece ence eee eee nent sese e eene 16 Figure 21 TriMode probe high frequency input impedance model ccc cece cee eeeene eens eens 16 Figure 22 Embedded probe fixture 00 0 aan 17 Figure 23 Typical channel isolation for P7500 Series TriMode probes ceceeeeeeeeeeeeees 20 Figure 24 Simplified model of a differential amplifier cesses 21 Figure 25 Typical CMRR for P7500 Series TriMode probes
37. nected to the probe tip ground interconnect using the probe tip cable coaxial shields P7504 amp P7506 TriMode Probes Technical Reference CIn Input follower clamp Input follower clamp Mode selection from controller Output amplifier Bin Input follower clamp Mode amplifier enable from controller 2161 026 Figure 4 TriMode input structure On oscilloscopes that do not provide full TriMode support the TriMode features are controlled by the probe Control Box switches which allow oscilloscope features like Probe Cal to be exercised only for the selected probe Input Mode On oscilloscopes that provide full TriMode support the oscilloscope controlled probe GUI graphical user interface can perform a Probe Cal operation on all Input Modes and Attenuation Settings at once using the TriMode Probe Cal fixture that is supplied with P7500 Series probes See the P7500 Series Quick Start User Manual for instructions on running the Probe Cal routine Full TriMode support will also allow storage and automatic recall of relevant settings like Offset See Figure 5 Probe Setup 6 O o O e 9 Figure 5 Typical TriMode Probe Setup screen 0 0 2573 008 P7504 amp P7506 TriMode Probes Technical Reference 5 Theory of Operation Probing Techniques to Maximize Signal Fidelity Socket C
38. ng in the front seats those closest to the tip ends Maintain a slight pressure on the spring to keep it in the front seats 2461 022 Figure 49 Set spring in front seat P7504 amp P7506 TriMode Probes Technical Reference 51 User Service 5 Set the top of the spring in the rear seats by lifting the tool to clear the edge of the rear seat with the top of the spring Spring seats Figure 50 Set the spring in the rear seats 6 Gently retract the tool from the spring Verify that the spring is seated as shown 2161 015 Figure 51 Properly seated spring 52 P7504 amp P7506 TriMode Probes Technical Reference User Service P75TC Probing Module Tip Equipment Required connector separator tool Cable 1 Disconnect the Cable Tip by the inserting the tool between the connectors The tapered edges of the tool gently separate the cable connector from the tip connector 2161 014 Figure 52 Disconnecting the tip cable 2 Repeat for the other cable and then pull both cables away from the tip connectors P75PMT Probing Module Equipment Required connector separator tool magnifying glass or microscope Tips Left and Right preferred tweezers and probe holder NOTE The probing module tips are electrically matched pairs and should be replaced together Failure to do so may degrade the performance of your probe 2161 017 Figure 53 Probing module tips P7504 amp P7506 TriMode Probes Technica
39. nted by single ended systems These devices include a variety of differential probes differential amplifiers and isolators A differential probe is basically a differential amplifier which is used to make differential measurements that reject any voltage that is common to the inputs and amplifies any difference between the inputs Voltage that is common to both inputs is often referred to as the Common Mode Voltage Vc and voltage that is different as the Differential Mode Voltage Vpm Differential O Vout Differential mode Figure 24 Simplified model of a differential amplifier Common Mode Rejection Differential amplifiers cannot reject all of the common mode signal The ability Ratio of a differential amplifier to reject the common mode signal is expressed as the Common Mode Rejection Ratio CMRR The CMRR is the differential mode gain Apm divided by the common mode gain Ac It is expressed either as a ratio or in dB A A CMRR PM dB 20 log 2 AcM AcM CMRR generally is highest best at DC and degrades with increasing frequency A typical CMRR plot for the P7500 Series TriMode probes is shown See Figure 25 on page 22 P7504 amp P7506 TriMode Probes Technical Reference 21 Reference 22 Assessing CMRR Error Input Impedance Effects on CMRR Differential Mode Rejection Stop 15 0000 GHz Figure 25 Typical CMRR for P7500 Series TriMode probes The CMRR of the P
40. obe Loading When you connect the probe inputs to a circuit you are introducing a new resistance capacitance and inductance into the circuit Each input of the differential probe has a DC input impedance of 50 kQ to ground See Figure 20 225 Q 50K VVV VVV A l gt 1 K Probe tip 90 fF 220 pF capacitance 50 fF 220 pF n K gt NA NM 225 Q 50 K 2161 044 Figure 20 TriMode probe input model For signals with low source impedance and frequency the 50 kQ input impedance on each input is large enough to prevent the inputs from loading the signal sources The more the signal source impedance on an input increases the more the probe loads the source and reduces the signal amplitude The greater the source impedances and the higher the signal frequencies the more you must take these factors into account The frequency of the signal also affects signal measurement As the frequency of the signal increases the input impedance of the probe decreases The lower the impedance of the probe relative to that of the source the more the probe loads the circuit under test and reduces the signal amplitude A high frequency input impedance model is shown below See Figure 21 12L 2161 058 Figure 21 TriMode probe high frequency input impedance model For impedance values of the individual TriMode solder tips refer to the specifications See page 28 Tip Specifications
41. ode Probes Technical Reference 37 Specifications Sa Alani average Trig IntemalClock 100KH2 puse frie zl xul ca na mcn sun Figure 38 P7506 probe with the P75TLRST solder tip 38 P7504 amp P7506 TriMode Probes Technical Reference P75PDPM Precision Differential Probing Module Specifications Specifications are typical and apply to all ranges and input modes unless specified otherwise The probing module is intended for differential mode measurements only Table 11 P75PDPM Precision Differential Probing Module specifications Differential mode A B Input impedance 430 Q at 1 GHz 400 Q at 2 GHz 320 Q at 4 GHz P7504 Bandwidth 24 0 GHz Rise time 1 lt 105 ps 20 80 lt 70 ps CMRR gt 60 dB at DC gt 40 dB at 50 MHz gt 30 dB at 1 GHz gt 28 dB at 2 GHz gt 25 dB at 4 GHz P7506 Bandwidth gt 6 0 GHz Rise time 1 lt 75 ps 20 80 lt 50 ps CMRR gt 60 dB at DC gt 40 dB at 50 MHz gt 30 dB at 1 GHz gt 25 dB at 3 GHz gt 20 dB at 6 GHz P7504 amp P7506 TriMode Probes Technical Reference 39 Specifications 10 32 M6 X 1 0 300Deepmin N p Bs 19 50 mm 20 y 6 32 O i 0 768 in Lg TIT mK E 12 70 mm 12 42 mm 0 500 in 0 489 in 33 02 mm 1 300 in 5 300 in 2161 029 Figure 39 P75PDPM Precision Di
42. olts inputs shorted to ground not open the displayed signal should be zero volts If a noticeable zero volt offset is present under the above conditions a Probe Cal operation should be performed See the P7500 Series Probes Quick Start User Manual P7504 amp P7506 TriMode Probes Technical Reference Theory of Operation ER to S to cn Percent of Range Vout Error Measured Expected Typical Differential 425 s Single Ended Common Mode Input Voltage Volts 2161 046 Figure 2 Dynamic range versus linearity 5X range Measured Expected Typical Percent of Range Vout Error 1 ft Differential s Single Ended amp Common Mode 2 Input Voltage Volts 2161 047 Figure 3 Dynamic range versus linearity 12 5X range P7504 amp P7506 TriMode Probes Technical Reference Theory of Operation TriMode Operation The TriMode feature of the new P7500 Series probe family is designed for improved convenience and enhanced capability in measuring differential signal quality Since a differential signal is composed of two complementary single ended signals full characterization of differential signal quality requires more than a simple differential measurement A TriMode probe features three Input Modes that allow a differential signal to be fully characterized
43. onnect the probe from the oscilloscope power cycle the oscilloscope and then reconnect the probe Connect the probe to a different oscilloscope If the symptoms remain they follow the probe then the probe is defective and must be returned to Tektronix for repair LEDs Flash On and Off Ifall of the Range or TriMode LEDs flash on and off repeatedly after you connect the probe an internal probe diagnostic fault exists Disconnect and reconnect the probe to restart the power on diagnostic sequence If the symptoms continue the probe is defective and must be returned to Tektronix for repair If the LEDs repeatedly flash on and off for a selected mode or range setting an internal probe diagnostic fault exists Disconnect and reconnect the probe to restart the power on diagnostic sequence If the symptoms continue the indicated setting is defective and the probe should be returned to Tektronix for repair Although the probe can be used under these conditions it may not pass the probe calibration procedure Signal Display If the probe is connected to an active signal source and you do not see the signal displayed on the oscilloscope perform the following checks P7504 amp P7506 TriMode Probes Technical Reference 43 User Service Replaceable Parts 44 Check the probe tip connection on your circuit m Check the probe tip connection at the probe body B Perform a functional check using the TriMode calibration board included
44. onnections and surface mount resistors are set back on the probe tip interface board The square pin header connector on the interface circuit board of the Micro Coax solder tip is shielded with a ground shield similar to that used on the mating Socket Cable 2573 013 Figure 7 Micro Coax solder tip P7504 amp P7506 TriMode Probes Technical Reference 7 Theory of Operation Damped Wire Tip The Damped Wire Tip is a non coaxial extended reach probe tip designed for DUT interconnect flexibility The primary focus is for a single ended probe tip solution with independent signal and ground connections By separating the signal and ground connections the user can provide a common ground connection for a group of different signal connections This tip reduces the interconnect soldering task for applications with many single ended signals and may have adequate performance for slower speed signals When routed closer together for a differential measurement the damped wire tip provides remarkably good high frequency performance ps E 9 2 a r d E IA a vd or a 2573 020 The Damped Wire Tip has a 1 7 inch reach which is designed for use in DDR memory module applications The performance is optimized by splitting the input signal pickoff resistor as is done with the High Temp and Micro Coax tips P75TLRST TriMode Solder Tip The P75TLRST probe tip is composed of a small form factor interconnect circuit board
45. owing figures show the typical step response of the TriMode probes with the Micro Coax solder tip A 50 ps filter was used on the pulse source for these measurements File Edit View Setup Utities Applications Help Triggered Thoms te co aas Acq Mode Average zl Trig intemal Clock E 100a 7 Epp 2 Pulse Y Amplitude nnn ca an mc nr 4 4 zw ael a8 30 0mV T E 20 00mV div Measurement Rise C3 A 114 6623ps 70 00mV 20 Dom 3 pov 3 main amp a f200 000p ER 200 Ops div fi Figure 28 P7504 probe with the Micro Coax solder tip P7504 amp P7506 TriMode Probes Technical Reference 29 Specifications i 88 Ven soup Uer open Heb ana el PESE soe mu Puce fare zl ma aa ca na zu ane sn Figure 29 P7506 probe with the Micro Coax solder tip 30 P7504 amp P7506 TriMode Probes Technical Reference Specifications High Temp Solder Tip Specifications are typical and apply to all ranges and input modes unless specified otherwise Table 8 High Temp solder tip specifications Measurement mode Differential Single ended Common A B A Gnd B Gnd A B 2 Gnd Input impedance 430 0 at 1 GHz 215 Q at 1 GHz 215 Q at 1 GHz 360 0 at 3 GHz 160 0 at 3 GHz 160 0 at 3 GHz 280 Q at 6 GHz 125 0 at 6 GHz 125 0 at 6 GHz
46. rranted electrical characteristics 2 0 0 0 eee 24 Table 4 Typical electrical characteristics esses meme me eene 25 Table 5 Typical mechanical characteristics eee 26 Table 6 Nominal electrical characteristics 0 cece sce e cece eee eee eee ee cence nee emen 27 Table 7 Micro Coax solder tip specifications cence eee ence ee een meme mene 28 Table 8 High Temp solder tip specifications c eee 31 Table 9 Damped Wire Pair specifications 0 ccce cece cece nana 34 Table 10 P7STLRST TriMode Long Reach Solder Tip specifications ccceeceeeneeeee eens 36 Table 11 P75PDPM Precision Differential Probing Module specifications cceeeeeee eens 39 Table 12 TriMode probes replaceable parts 0 ccc cee cece eee 44 Table 13 Required equipment cicer stance dette canes dened Tue 0 da eb ERE ERN IR sense deans 44 P7504 amp P7506 TriMode Probes Technical Reference 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 While using this product you may need to access other parts of a larger system Read the safety sections of the other component manuals for warnings and cautions related to operating the sys
47. ry of Operation P75PDPM Precision The P75PDPM Probing Module is designed for handheld and fixtured probing Differential Probing applications The P75PDPM probe tip is composed of two replaceable probe tip Module circuit boards with a pin on one end and a G3PO socket connector on the other Damping resistors on the tip boards near the input pins and a 50 transmission line on the board transmit the signal from the input pin to the G3PO socket connector The probe tip boards are connected to the P7500 probe body with a very low skew lt 1 ps cable assembly P75TC The left side and right side probe tip boards mount at an angle in the P7SPDPM adjustment housing The probe tip spacing is adjustable from 0 030 0 180 in 0 76 4 57 mm using the thumb operated screw Because of the variable spacing between the two probe tip boards a gold plated ground spring is connected between the probe tip boards to ensure a good common mode ground return near the probe tip pins C Dow Figure 15 P75PDPM Precision Differential Probing Module The P75PDPM probe tip circuit boards mount in an articulating metal housing that also supports the variable spacing control The angle of the probe tip housing can be adjusted and locked in place using an articulation screw in the probe holder bar The probe holder bar contains mechanical details for retaining the probe tip cable assembly as well as a retaining clamp for the probe body The probe holder bar ca
48. t board or circuit board connections due to accidental movement of the probe and soldered leads we recommend that you secure the tip to the circuit board using the adhesive tip tape provided in your accessory kit You can also use other materials such as Kapton tape or hot glue To avoid damage to the tip or the circuit under test avoid applying excessive heat from the soldering iron Use a low wattage temperature controlled soldering iron and appropriately sized soldering iron tip To prolong the life of your solder tips consider the following points before you use the solder tips Consider the types of measurements that you plan to take If you are going to take a few measurements at one location and then move to another you may be able to use longer wires Longer wires may degrade your measurement slightly which may not matter but the wires can then be cut or desoldered at your circuit and reused rather than subjecting the solder tip to a desolder solder cycle Perhaps the optional P75PDPM Precision Differential Probing Module is a better choice for the test points that you do not measure as often The probing module can take both single ended and differential measurements and when used with a probe positioner can provide hands free access to tight spaces Depending on your measurement requirements and circuit geometries the probing module might be a preferable alternative At critical test points such as circuit outputs you
49. table below lists some popular high speed data communication standards that can be measured with the P7500 Series TriMode Probes Table 2 Serial bus standards with dynamic range requirements Standard Data Rate Vdm max Vdm min Vcm max Vcm min HDMI DVI 1 65 Gb s 800 mV 150 mV 3 3V 2 8 V InfiniBand TX 2 5 Gb s 1 6 V 1 0V 1 0 V 0 5 V InfiniBand RX 2 5 Gb s 1 6V 0 175 V 1 0 V 0 5 V PCI Express TX 2 5 Gb s 1 2V 0 8 V AC AC PCI Express RX 2 5 Gb s 1 2V 0 175 V AC AC Serial ATA TX 1 5 Gb s 0 6 V 0 4 V 0 3 V 0 2V Serial ATA RX 1 5 Gb s 0 6 V 0 325 V 0 3 V 0 2 V XAUI TX 3 125 Gb s 0 4 V XAUI RX 3 125 Gb s 0 1V OIF Sxl 5 TX 3 125 Gb s 1 0V 0 5V 1 23 V 0 72V OIF Sxl 5 RX 3 125 Gb s 1 0 V 0 175 V 1 30 V 1 10 V LV PECL std ECL gt 12 GHz 1 66 V 1 48 V 1 3 V vt 0 5 V vt typ LV PECL RSECL gt 12 GHz 1 05 V 0 70 V 1 3 V vt 0 5 V vt P7504 amp P7506 TriMode Probes Technical Reference 23 Specifications Specifications These specifications apply to the P7500 Series TriMode Probes installed on an oscilloscope with a TekConnect interface 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 allowed limits See Table 3 Specifications for the P7500 Series TriMode Probes fall into three categories warranted typical and nomin
50. tem To Avoid Fire or Personal Connect and Disconnect Properly Connect the probe output to the measurement Injury instrument before connecting the probe to the circuit under test Connect the probe reference lead to the circuit under test before connecting the probe input Disconnect the probe input and the probe reference lead from the circuit under test before 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 further ratings information before making connections to the product Do not apply a potential to any terminal including the common terminal that exceeds the maximum rating of that terminal 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 P7504 amp P7506 TriMode Probes Technical Reference V General Safety Summary Terms in this Manual These terms may appear in this manual WARNING Warning statements identify conditions or practices that could result in injury or loss of life
51. than the probe dimensions The box should have a carton test strength of at least 200 pounds Put the probe into an antistatic bag or wrap to protect it from dampness Place the probe into the box and stabilize it with light weight packing material Seal the carton with shipping tape Refer to Contacting Tektronix on the copyright page of this manual for the shipping address P7504 amp P7506 TriMode Probes Technical Reference
52. ving the bullets 45 2 8 etie a ord intaia dundee MER RUNI e RERO gr sende 45 Installing the 11015 oi eor Ree ata ua a eve a ata eat e AT Va 46 Large and small springs installed 00 cece ccc c eee cee eee cence eee enna mm 48 NIRE 2 49 Insert tool beneath spring cece cece eee eee I me eme mese e mese nene 49 Transfer spring from tip to tool 2 0 0 0 ccc cece ccc nce eee eee Ie eme eme emen 50 Place spring omtool erase as xe eere eere etate E Reo Re ete edo re wt 5 Set spring in front seat eee det regc ERR OO MR SER edo nde Bree Soe eee ndr EU dud 5 Set the spring in the rear Seats ccc cece cece eee enn meme me emen enne 52 Properly seated e eI eeu ante Ia rese d tke erra Endo ced UG 52 Disconnecting the tip cable eme mene mese 53 Probing module tips eee e messe messes 53 Removing the tp ized bem 9000 54 Separating the 99 0 54 Seating the tip in the top tabs iiec eere Reve eae aaa Ed dex ee a Ra e Te de dit aa 55 Snapping the tip into the bottom tabs 0 cece cece eee 55 P7504 amp P7506 TriMode Probes Technical Reference iii Table of Contents List of Tables iv Tablea TriMode probes n see er a ei a at ra ee at EE anti 8 aa DRE a arda n et vii Table le Offset ranges cores ea ended weeded des Goto ee de a at hee 2 dene eel Na d au Dai 19 Table 2 Serial bus standards with dynamic range requirements ecceeceeeeee eee eeaeeneeenaes 23 Table 3 Wa
53. with SMD0402 damping resistors and a set of vias for wire attachment to the DUT Device Under Test The circuit board vias are designed for both 4 mil and 8 mil wire and a special high tensile strength wire is supplied as part of the wire accessory kit The expanded view of the probe tip shows the location of the A and B signal inputs as well as the two ground reference connections O 8 6 LT 2161 031 Figure 8 P75TLRST TriMode Long Reach Solder Tip The recommended wire attachment method is to first solder the wires to the DUT being careful to minimize the wire length of the signal and ground connections This is followed by threading the wires through the probe tip board vias being careful to achieve as symmetrical a wire pattern as possible between the two signal inputs and a very short ground connection Finally the attachment is completed by soldering the wires on top of the probe tip circuit board Any excess P7504 amp P7506 TriMode Probes Technical Reference Theory of Operation wire lead length extending through the probe tip board should be removed to minimize possible signal reflection problems Because of the limited mechanical strength of the wire interconnect and probe tip circuit board the solder down probe tip should be taped down at the DUT for strain relief Although the accessory kit includes adhesive strips that can be used for the strain relief of the probe tip the use of
54. with four measurements differential positive polarity and negative polarity single ended and common mode A TriMode probe provides improved efficiency and convenience by enabling full differential signal characterization from a single soldered connection Using one of the solder tips available for the TriMode probes for example the P7STLRST probe tip probe connections are soldered to the two complementary signals the A signal and the B signal and a ground reference From this single DUT device under test connection the internal electronic switching control of the TriMode probe allows any one of the three probe Input Modes four measurements to be selected at a time The TriMode probe inputs are routed on the probe ASIC application specific integated circuit to a set of four independent input amplifiers that perform the following signal calculations A B for differential signal measurement AC GND for positive polarity single ended measurement B GND for negative polarity single ended measurement A B 2 GND for common mode measurement NOTE In the B GND Mode the negative polarity B input is not inverted The four input amplifiers are multiplexed together and only the selected Input Mode function is output to the connected oscilloscope See Figure 4 on page 5 The figure shows a conceptual view of the TriMode probe input structure where the C input provides the probe ground reference and is con
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