P7500 Series TriMode™ Probes Technical Reference
Contents
1. 0 20 21111111111 45 Figure 475 Removing the tip 2 25 d pre S oe type dus dee nete pedes o ua 46 Figure 48 Separating the tip board pair 0 00 1111111110 46 Figure 49 Seating the tip in the top tabs csse em e m e e e nene 47 Figure 50 Snapping the tip into the bottom tabs sss nee 47 P7500 TriMode Probe Family Technical Reference iii Table of Contents List of Tables Offset range Serenes erinan E cs 00 MES Oda 17 Serial bus standards with dynamic range requirements oes 21 Warranted electrical characteristics 1 161112 22 Typical electrical characteristics esses eme mese enn 23 Typical mechanical characteristics 1161114 1 24 Nominal electrical characteristics 0 1 1111 141 2 25 TriMode probes replaceable parts 0 2 22111111121120 36 Required 36 P7500 TriMode Probe Family Technical Reference Table 1 Table 2 Table 3 Ta2. Ain 4 060 mm SS P 5 740 in 0 160 in 5 08 mm Tes 0 200 in Specifications Tip Specifications P75TLRST TriMode Long Reach Solder Tip Probe model bandwidth Rise time P7513 gt 13 0 GHz 10 90 lt 40 ps 20 80 lt 32 ps P7516 gt 16 0 GHz 10 90 lt 28 ps 20 80 lt 24 ps 4 0 012 002 11 68 mm 0 470 in Figure 22 P75TLRST TriMode Long Reach Solder Tip dimensions P7500 TriMode Probe Family Technical Reference 26 Specifications The following figures show the typical step response of the TriMode probes with the P75TLRST solder tip TT ep 200mvieiw son ios 25005 50068 00 Run Average t6 14 018 aca RUS OK A 1 GID 20mviaiv son 8216 06 amv 250ps 50088 IT SO0fs pt Run Average t6 22752 acqs 5 Figure 24 P7516 probe with the P75TLRST solder tip P7500 TriMode Probe Family Technical Reference 27 The following figures show the typical impedance and bandwidth plots of the TriMode probes with the P75TLRST solder tip 500 Z Probe 400 5 8 amp 300 O 5 5 8 200 D E a 100 0 0 5 10 15 20 Frequency GHz 2164 088 Figure 25 P75TLRST differential impedance versus lump element equivalent 300 NR on e 200 150 100 Common Mode Impedance Q 50 0 2 4 6 8 10 12 14 16 Freque
3. by the probe While this technique may not give you accurate measurements it does allow you to determine 11 the magnitude of the common mode error signal 18 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 Ac divided by the differential mode gain Apy It is expressed either as a ratio or in dB and degrades at higher frequencies Acy ACM CM dB 20 log C DM DM DMRR P7500 TriMode Probe Family Technical Reference Reference Assessing CMRR Error Input Impedance Effects on CMRR Differential Mode Rejection 20 Reference Serial Bus Standards The 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
4. 12 42 mm 0 500 in 0 489 in 5 300 in Figure 29 P75PDPM Precision Differential Probing Module dimensions P7500 TriMode Probe Family Technical Reference 30 Specifications The following figures show the typical step response of the TriMode probes with the P75PDPM probing module E 200mvieew son N06 Figure 31 P7516 probe with the P75PDPM probing module P7500 TriMode Probe Family Technical Reference 31 The following figures show the typical differential impedance and bandwidth of the TriMode probes with the P75PDPM probing module 500 Z Probe a 400 Z eq 5 5 300 5 5 200 00 00 EE RCE se A 100 0 0 5 10 15 20 Frequency GHz 2161 087 Figure 32 P75PDPM differential impedance versus lump element equivalent 5 6 7 8 9 10 11 12 1413 14 715 716 17 18 19 20 0 Probe Gain dB 2 4 6 8 10 12 13 Frequency GHz 2161 041 Figure 33 P75PDPM bandwidth on a P7513 probe P7500 TriMode Probe Family Technical Reference Specifications 32 Specifications 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Probe Gain dB 0 2 4 6 8 10 12 14 16 Frequency GHz 2161 009 Figure 34 P75PDPM bandwidth on a P7516 probe P7500 TriM
5. 6 Nominal electrical characteristics Characteristic Description Input configuration P75TLRST solder tip Differential two signal inputs and shared with single ended Single ended one each and signal input and two ground inputs P75PDPM handheld Differential two inputs and Output coupling DC Attenuation settings 5X and 12 5X Termination Terminate output into 50 0 P7500 TriMode Probe Family Technical Reference 25 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 CMRR DMRR Channel Isolation gt 60 dB at DC lt 40 dB at 50 MHz 5X gt 40 dB at 50 MHz gt 40 dB at 50 MHz 5X 235 dB at 50 MHz 12 5X gt 30 dB at 1 GHz 235 dB at 50 MHz 12 5X gt 30 dB at 1 GHz 220 dB at 7 GHz gt 30 dB at 1 GHz 220 dB at 7 GHz lt 10 dB at 13 GHz 220 dB at 7 GHz gt 15 dB at 13 GHz gt 15 dB at 13 GHz 60 dB at DC 40 dB at 50 MHz 5X 40 dB at 50 MHz lt 40 dB at 50 MHz 5X gt 35 dB at 50 MHz 12 5X gt 30 dB at 1 GHz gt 35 dB at 50 MHz 12 5X gt 30 dB at 1 GHz gt 20 dB at 8 GHz gt 30 dB at 1 GHz gt 20 dB at 8 GHz gt 6 dB at 16 GHz gt 20 dB at 8 GHz gt 15 dB at 16 GHz gt 15 dB at 16 GHz gos 1 65mm 0 065 in 6 78 mm 0 267 in 1 02 mm 0 040 in p SEES e n d Cn 305mm P di c38 4 0 120in
6. Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 Figure 20 Figure 21 Figure 22 Figure 23 Figure 24 Figure 25 Figure 26 Figure 27 Figure 28 Figure 29 Figure 30 Figure 31 Figure 32 Figure 33 Figure 34 Figure 35 Figure 36 Figure 37 Figure 38 Table of Contents Figure 39 Insert tool beneath spring csse II eme ee me e e nere 41 Figure 40 Transfer spring from tip to tool 0 0 110 1 1111111 42 Figure 41 Place spring on tool 0 00 110 111111 43 Figure 42 Set spring in front Seats vein osse eye edge de Bate aa Mene erede ah e Fee NOE e Rue vali 43 Figure 43 Set the spring in the rear seats sisse mee e emen 44 Figure 44 Properly seated 100 1 1106 5011 44 Figure 45 Disconnecting the tip 0 0 08016 111111111110 45 Figure 46 Probing module tips
7. P7500 TriMode Probe Family Technical Reference Theory of Operation Input Impedance and Probe 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 characteristic input impedance of 50 kQ to ground See Figure 16 225 Q 50 K Ae gt 75 fF K I P75TLRST 50 fF 220 pF 50 fF 50 fF 220 pF P75PDPM If If IV Be lt 225 0 0 6 2161 044 Figure 16 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 P7500 TriMode Probe Family Technical Reference 15 Theory of Operation Embedded Probe Itis possible to acquire signals with the P7500 S
8. Probe Family Technical Reference Theory of Operation 10 Theory of Operation em 200mviciv son 16 06 250ps 0 0GSis IT ofupt StDev Count info ED Rie Sai em me 1 591 0 0 33 92p 13241 362p a heo 3910 Ovrsht 15 49 14 854321 fae zg4 amp 4m Figure 9 P75TLRST solder tip with 0 100 in of tip wire 200mviaiv son 6 f M GP asem 250ps 0 0GS s IT S00fsipt Run rage Value Max 10ev Count into P Riso E I UTI rasp pasir pes I ED Rise dds p Dip pese gest 310 0 GD sovrent 43 ass 383 15 58 927m oo Figure 10 P75TLRST solder tip with 0 200 in of tip wire The P75PDPM Probing Module is designed for handheld and fixtured probing applications The P75PDPM probe tip is composed of two replaceable probe tip 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 Q 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 P7500 TriMode Probe Family Technical Reference 11 P75PDPM Precision Differential Probing Module The left side and right side probe tip boards mount at an angle in the P7SPDPM adjustmen
9. VREF Vec 1 3 To measure single ended signals in this class connect the negative input of the P7500 TriMode Probe to Vrer A differential probe in these applications displays the true signal despite any AC or DC variation in Vrer from its nominal value A single ended probe displays the signal plus the variation in Var 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 negative 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 Table 1 Offset ranges Probe P7240 P7516 TriMode Probe differential mode P7516 TriMode Probe Single ended and common mode P7500 TriMode Probe Family Technical Reference 17 Reference Channel Isolation Under ideal conditions when taking 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 wi
10. sharp edge Figure 48 Separating the tip board pair 46 P7500 TriMode Probe Family 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 49 Seating the tip in the top tabs 8 Press the bottom of the board to snap it past the bottom tabs 2161 020 Figure 50 Snapping the tip into the bottom tabs 9 Repeat steps 7 and 8 for the other tip 10 Attach the spring See page 40 P75PDPM Probing Module Springs 11 Reattach the cable pair P7500 TriMode Probe Family Technical Reference 47 If the original packaging is unfit for use or not available use the following packaging guidelines Use a corrugated cardboard 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 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 P7500 TriMode Probe Family Technical Reference 1 mu d c User Service Preparation for Shipment 48
11. sssssssssssssse Typical channel isolation for P7500 Series Tri Mode probes Simplified model of a differential amplifier suus Typical CMRR for P7500 Series TriMode probes Probe body and control box dimensions seseessssss P75TLRST TriMode Long Reach Solder Tip dimensions P7513 probe with the P7STLRST solder tip esses P7516 probe with the P7STLRST 5016600 1 P7STLRST differential impedance versus lump element equivalent P7STLRST common mode impedance sesesesessussse P7STLRST bandwidth on a P7513 probe sssseessessse P7STLRST bandwidth on a P7516 probe ssesesessssesse P75PDPM Precision Differential Probing Module dimensions P7513 probe with the P75PDPM probing module P7516 probe with the P75PDPM probing module P75PDPM differential impedance versus lump element equivalent P75PDPM bandwidth on a P7513 probe ce cee eee eee e eee es P75PDPM bandwidth on a P7516 probe sees Removing the bullets sesssssssssssssss e ene eeneennee es Installing the bullets 0 0 0 c cece cece cence enere eee nese eee eneeea Large and small springs installed esee Ns P7500 TriMode Probe Family Technical Reference Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9
12. the probe body with the pliers 2158 017 Figure 35 Removing the bullets P7500 TriMode Probe Family Technical Reference 37 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 the tool out of the probe body Bes om 2 2 Repeat for the other bullet 2158 025 Figure 36 Installing the bullets 38 P7500 TriMode Probe Family 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 Therefore to prolong the life of your solder tips consider the following points before you use the solder tips CAUTION To prevent damage to the circuit board or circuit board connections due to accidental movement of the probe and soldered leads we reco
13. 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 P7500 TriMode Long Reach The P75TLRST probe tip is designed for solder down probing applications It Solder Tip P75TLRST 18 composed of a small form factor interconnect circuit board with SMD0402 damping resistors and a set of vias for wire attachment to the DUT 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 See Figure 5 2161 031 Figure 5 P75TLRST TriMode Long Reach Solder Tip Attached to the circuit board are a pair of very low skew 1ps coaxial cables and a polarized G3PO dual connector block 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 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 bullet
14. 1999 xx kit of 4 small springs P75PMT Probing Module P75PMT one pair tips left and right P75TC Probing Module Tip P75TC qty 1 Cable Refer to the user manual for a list of the accessories that are available for your probe Table 8 Required equipment Description Minimum requirement Recommended example 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 Probe positioner or bench Able to hold probe PPM203B or PPM100 vise 1 Nine digit part numbers xxx xxxx xx are Tektronix part numbers P7500 TriMode Probe Family Technical Reference User Service Replaceable Parts 36 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
15. NIX 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 Table of Contents General Safety SUmtflaly leto adanccaobeienaddnensadadawbbbainnaddahet ENNET E NANA ENAA OEN died tens Qa eH rhea EST ederet tur PERS Theory of Operation coo ee eot oot tette ele inte ti Ure xul uie pol lS Iu Au eee oeste Input Voltage Limits esee cerebro DE Rr PR NAR RE E DIA RT Fe RR a e pe te ERN TriMode Operation 5 3 oe dad eret Po e E SER ruine Uo LOU RIS EAE IUDAS IE REED Te tuES Probing Techniques to Maximize Signal Fidelity sss Input Impedance and Probe Loading ssssssssssssssssssse mee menn hice cU Single Ended Measurements Using A and B Modes 1111111110 Differential Measurement oi ie eere Eben Re ERR E SES Ve o a B eme ndic eee Serial Bus Standards ecce utres nue DRY Ue e eu ER ERR IRA ey e e E teet n ees Specifications oser
16. P7500 Series TriMode Probes Technical Reference www tektronix com Tektronix 071 2161 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 Velcro is a registered trademark of Velcro Industries B V Contacting Tektronix Tektronix Inc 14200 SW Karl Braun Drive P O Box 500 Beaverton OR 97077 USA For product information sales service and technical support In North America call 1 800 833 9200 Worldwide visit www tektronix com to find contacts in your area Warranty 2 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 will repair the defective product without charge for parts and labor or will provide a replacement in exchange for the defective product Parts modules and replacement products used by Tektronix for warranty work may be new or reconditioned to like new performance All rep
17. Vdm max Vdm min X 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 6V 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 SxI 5 TX 3 125 Gb s 1 0V 0 5V 1 23 V 0 72 V OIF SxI 5 RX 3 125 Gb s 1 0V 0 175 V 1 30 V 1 10 V LV PECL std ECL lt 12 GHz 1 66 V 148 V 1 3 V vt 0 5 V vt typ LV PECL RSECL lt 12 GHz 1 05 V 0 70 V 1 3 V vt 0 5 V vt P7500 TriMode Probe Family Technical Reference 21 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 nominal characteristics Warranted characteristics describe guaranteed performance within tolerance limits or certain type tested requirements Specifications Specifications Warranted Characteristics Table 3 Warranted electrical characteristics Sp
18. ble 4 Table 5 Table 6 Table 7 Table 8 iv 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 system 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 dama
19. e een rinia Warranted Characterlsti6s enine eurien a rote E Due oa EEE ANE E EEE EEES Typical Characteristics rcii aae O R N E AA OEE Nominal Tip Specifications Tm User 00 E E E Gandara e s E E E EE E Error Condition seos P vies dene ae EE A E E EE EE E E Replaceable Parts MEDIE Preparation for Shipment 2 2 P7500 TriMode Probe Family Technical Reference Table of Contents List of Figures Operating voltage WindOW cecceceecee nee ne eee eee eaeeaeeneeees Dynamic range versus linearity 5X range ceceeeene ence ee Dynamic range versus linearity 1 2 5225 eens TriMode input structure 2 0 0 0 cece cee ce cece eee P7STLRST TriMode Long Reach Solder Tip ses Typical wire length from probe tip to circuit cece eee ee eee P75TLRST solder tip with 0 010 in of P75TLRST solder tip with 0 050 in of eee P75TLRST solder tip with 0 100 in of ccc eee P75TLRST solder tip with 0 200 in of tip 160 P75PDPM Precision Differential Probing Module P75PDPM with short ground spring 0 030 in spacing P75PDPM with short ground spring 0 050 in spacing P75PDPM with short ground spring 0 090 in spacing P75PDPM with short ground spring 0 180 in spacing TriMode probe input model ssssssseesesee Embedded probe fixture
20. ecification applies to all models unless specified otherwise P7513 P7516 lt 40 ps lt 32 ps lt 28 ps lt 24 ps 0 2125 2 5X 0 0833 2 12 5X 3 mV 20 to 30 C 68 to 86 F 5X 14 1 mV on oscilloscope 3 mV 20 to 30 C 68 to 86 F 12 5X 36 mV on oscilloscope Operating 0 to 40 C 32 to 104 F Nonoperating 20 to 71 C 4 to 160 F Operating 20 80 RH at up to 40 C 104 F Nonoperating 5 90 RH Operating 3000 meters 10 000 feet Nonoperating 12 000 meters 40 000 feet Characteristic Rise time 1 10 90 20 80 Using a 250 mV step 18 to 28 C 64 to 82 F DC attenuation accuracy Output Offset Zero Temperature Humidity Altitude 1 Measurements taken using an embedded probe fixture P7500 TriMode Probe Family Technical Reference 22 Specifications Typical Characteristics Typical characteristics describe typical but not guaranteed performance Table 4 Typical electrical characteristics Specification applies to all models unless specified otherwise 100 KQ 6 0 2500 side to side with respect to ground Characteristic Differential input resistance DC coupled Input resistance matching Common mode input resistance DC 50 kQ 3 kQ coupled Offset voltage range differential mode 1 5V to 1 5V Offset voltage range single ended and 2 0 V to 2 0 V 0 10 2 referred to input 0 20 2 referred to input comm
21. ection 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 P7S5PDPM is the A B DIFF mode since for differential signals there 15 an inherent virtual ground present in the measurement circuit 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 9095 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 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 oscilloscope P7500 TriMode Probe Family Technical Reference Theory of Operation Theory of Operation Figure 13 P75PDPM with short ground spring 0 050 in spacing P7500 TriMode Probe Family Technical Reference 13 Theory of Operation VET 250ps SO 0GS s IT SOOfs pt Run Average 16 16 656 9 RUSO m 0 250ps 50 0GS s IT S00fs pt Run Avorage 10 StDev Count 13920 acqs RL 6 0k wart 6406 T Figure 15 P75PDPM with short ground spring 0 180 in spacing 14
22. 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 volts 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 P7500 TriMode Probe Family Technical Reference Theory of Operation Operating Voltage Window Differential Mode Signal Range Offset Voltage Range Theory of Operation T3 tn 2 ter Un D a 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 E LLLA Differential s Single Ended amp Common Mode 2 Input Voltage Volts 2161 047 Figure 3 Dynamic range versus linearity 12 5X range P7500 TriMode Probe Family Technical Reference 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 c
23. ement accuracy B Specifications Contains warranted typical and nominal characteristics for the probe and probe tip accessories m User Service Describes troubleshooting and probe maintenance P7500 TriMode Probe Family Technical Reference 1 Introduction 2 P7500 TriMode Probe Family Technical Reference Theory of Operation This section discusses operating considerations and probing techniques For more detailed information about differential measurements and TriMode operation refer to Reference See page 17 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 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 23 Maximum Input Voltage The maximum input voltage is the maximum voltage to ground that the inputs can withstand without damaging the probe input circuitry 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 inp
24. erence 23 Specifications Characteristic Specification applies to all models unless specified otherwise Operating Voltage Window 2 0 V to 4 0 V Linearity 1 over a dynamic range of 0 75 V to 0 75 V for 5X 1 over a dynamic range of 1 75 V to 1 75 V for 12 5X DC offset drift differential mode 0 47 mV C 5X referred to input 0 72 mV C 12 5X referred to input DC offset drift single ended and 0 47 mV C 5X referred to input common mode ground referenced 0 24 mV C 12 5X referred to input DC voltage measurement accuracy 2 of input 2 of offset 15 mV 4 7 mV 5X 2 of input 2 of offset 75 mV 20 mV 12 5X 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 cable length 1 0 m 39 3 in from the probe body to the control box Unit weight 1 550 g 3 1 Ibs probe accessories and packaging 34 93 mm 0 1 375 A d 1 60 in M 01 60 mm Pu 4 00 in 889 mm 0 360 in Figure 21 Probe body and control box dimensions 2161 001 24 P7500 TriMode Probe Family Technical Reference Specifications Nominal Characteristics Nominal characteristics describe guaranteed traits but the traits do not have tolerance limits Table
25. eries TriMode probes by including an embedded connection in your circuit See Figure 17 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 17 Embedded probe fixture 16 P7500 TriMode Probe Family Technical Reference This section contains information about taking measurements with the TriMode probes and increasing measurement accuracy Reference 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 with much lower bandwidth performance See Table 1 Dynamic DC Offset Dynamic DC Offset 5X Range 5X 12 5X Range 12 5X 5 4 Vpp 1 5V 1 5 V 1 5 Vpp 115 V 1 5 V 3 5 Vpp 2 0 V 2 0 V 1 5 Vpp 2 0 V 2 0 V 3 5 Vpp Differential probes are ideal for a class of single ended measurements where the reference voltage is not ground E SSTL 1 2 Var VREF a Vpp 2 PECL
26. ge 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 P7500 TriMode Probe Family 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 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 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 P7500 TriMode Probe Family Technical Reference Introduction This manual discusses topics that are not covered in depth in the P7500 Series TriMode Probes Quick Start User Manual The main sections are B Theory of Operation Contains probe details not covered in the user manual Reference Contains information about differential measurements and how to increase measur
27. ief of the probe tip the use of mylar tape will generally provide stronger attachment if room is available at the DUT The lead length of the 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 6 2161 042 Figure 6 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 when the wire length 15 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 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 oscilloscope P7500 TriMode Probe Family Technical Reference 9 ine metis tno Run Averago 16 12320 acq RUSO Figure 7 P75TLRST solder tip with 0 010 in of tip wire ss A aA ED 156mv 250ps 0 0GSis 5008 Run Average t6 10 28 9 56 Figure 8 P75TLRST solder tip with 0 050 in of tip wire P7500 TriMode
28. l away from the tips so that the spring clears the seat edge EN 2161 004 Spring seats Figure 40 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 42 P7500 TriMode Probe Family 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 S523 2158 012 Figure 41 Place spring on tool 4 Set the bottom of the spring 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 42 Set spring in front seat P7500 TriMode Probe Family Technical Reference 43 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 43 Set the spring in the rear seats 6 Gently retract the tool from the spring Verify that the spring is seated as
29. laced 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 caused by the use of non Tektronix supplies or d to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product THIS WARRANTY IS GIVEN BY TEKTRO
30. mmend 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 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 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 P7500 TriMode Probe Famil
31. ncy GHz 2161 045 Figure 26 P75TLRST common mode impedance P7500 TriMode Probe Family Technical Reference Specifications 28 Specifications 5 6 7 8 9 10 12 13 14 15 16 17 18 19 20 Probe Gain dB 0 2 4 6 8 10 12 13 Frequency GHz 2161 040 Figure 27 P75TLRST bandwidth on a P7513 probe 5 6 7 8 9 10 11 12 713 14 715 716 717 18 19 20 Probe Gain dB 2 4 6 8 10 12 14 16 Frequency GHz 2161088 Figure 28 P75TLRST bandwidth on a P7516 probe P7500 TriMode Probe Family Technical Reference 29 Specifications are typical and apply to all ranges and input modes unless specified CMRR gt 60 dB at DC gt 40 dB at 50 MHz 5X 235 dB at 50 MHz 12 5X gt 30 dB at 1 GHz 220 dB at 7 GHz gt 15 dB at 13 GHz gt 60 dB at DC gt 40 dB at 50 MHz 5X 235 dB at 50 MHz 12 5X gt 30 dB at 1 GHz 220 dB at 8 GHz 215 dB at 16 GHz 33 02 mm 1 300 in 2161 029 40 ps 32 ps 28 ps 24 ps Specifications P75PDPM Precision Differential Probing otherwise Module Probe model bandwidth Rise time P7513 gt 13 0 GHz 10 90 20 80 P7516 gt 16 0 GHz 10 90 20 80 M6X1 0 0 300 Deep min T NN NI 0 768 in D m mMm 0 12 70 mm
32. ode Probe Family Technical Reference 33 Specifications 34 P7500 TriMode Probe Family 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 48 Preparation for Shipment Error Condition 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 Disconnect the probe and reconnect it to another channel to isolate the problem If the symptoms persist with the probe call your Tektronix representative for service P7500 TriMode Probe Family Technical Reference 35 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 7 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 P75PDPM Probing Module 016 1998 xx kit of 4 large springs springs 016
33. omplementary 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 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 the P75TLRST 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 The four input amplifiers are multiplexed together and only the selected Input Mode function is output to the connected scope See Figure 4 on page 7 The figure shows a conceptual view of the TriMode probe inp
34. on mode ground referenced Offset scale accuracy differential mode Offset scale accuracy single ended and common mode ground referenced Noise differential mode 33 nV H z 5X 48 nV V H z 12 5X Noise single ended and common mode 38 nV H z 5X ground referenced 52 nV WH z 12 5X Delay time 4 4 ns 0 1 ns Input impedance See page 26 Tip Specifications Bandwidth P7513 P7516 See page 26 Tip Specifications 13 GHz 16 GHz Common mode rejection ratio gt 60 dB at DC gt 60 dB at DC differential mode 240 dB to 50 MHz 5X 240 dB to 50 MHz 5X 230 dB to 1 GHz 230 dB to 1 GHz 220 dB to 7 GHz 220 dB to 8 GHz 215 dB to 13 GHz 215 dB to 16 GHz Differential mode rejection ratio 240 dB to 50 MHz 5X 240 dB to 50 MHz 5X common mode 235 dB to 50 MHz 12 5X 235 dB to 50 MHz 12 5X See page 26 Tip Specifications gt 30 dB to 1 GHz lt 30 dB to 1 GHz 220 dB to 7 GHz 220 dB to 8 GHz 215 dB to 13 GHz 215 dB to 16 GHz Channel isolation single ended mode 240 dB to 50 MHz 5X 240 dB to 50 MHz 5X 230 dB to 1 GHz 230 dB to 1 GHz 220 dB to 7 GHz 220 dB to 8 GHz 215 dB to 16 GHz 215 dB to 13 GHz 15 Vioc peak ac between each input or between either probe inputs and ground 0 750 V at attenuation setting of 5X 1 75 V at attenuation setting of 12 5 Maximum non destructive input voltage Differential signal range DC coupled P7500 TriMode Probe Family Technical Ref
35. s 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 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 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 8 P7500 TriMode Probe Family Technical Reference Theory of Operation 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 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 rel
36. shown 2161 015 Figure 44 Properly seated spring 44 P7500 TriMode Probe Family 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 45 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 46 Probing module tips P7500 TriMode Probe Family Technical Reference 45 User Service Remove 1 Disconnect the Cable Tips See page 45 P75TC Probing Module Tip Cable Remove the spring See page 40 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 47 Removing the tip 5 Repeat for the other tip Install 6 Separate the new tip board pair by snapping the board against a
37. t 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 2161 034 Figure 11 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 can 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 conn
38. th 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 S1 B input 52 Output 3 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 18 eet ity Tadd JUL ILIULILE L YU VM ry MAL Chi Stan 50 0000 MHz Stop 15 0000 GHz Figure 18 Typical channel isolation for P7500 Series TriMode probes 18 P7500 TriMode Probe Family 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 19 Devices designed for differential measurements avoid problems presented 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 differen
39. tial 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 Vcm and voltage that is different as the Differential Mode Voltage Vpm Differential O Vout Differential mode Figure 19 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 Acw It is expressed either as a ratio or in dB AD ApM DM dB log lu CM CM CMRR 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 20 on page 20 P7500 TriMode Probe Family Technical Reference 19 Stop 15 0000 GHz Figure 20 Typical CMRR for P7500 Series TriMode probes The CMRR of the P7500 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
40. ut and ground CAUTION To avoid ESD damage to the probe always use an antistatic wrist strap provided with your probe and work at a static approved workstation when you handle the probe P7500 TriMode Probe Family Technical Reference 3 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 See Figure 1 A common mode voltage that exceeds the operating voltage window may produce an erroneous output waveform even when the differential mode specification is met A 15V 5X 4 0V 12 5 X Aa 2161 025 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 following two graphs 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
41. ut structure where the C input provides the probe ground reference and is connected to the probe tip ground interconnect using the probe tip cable coaxial shields P7500 TriMode Probe Family Technical Reference Theory of Operation TriMode Operation Theory of Operation 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 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 future oscilloscopes that provide full TriMode support the scope controlled probe GUI can perform a Probe Cal operation on all Input Modes and Attenuation Settings at once using the TriMode Probe Cal fixture that 1s supplied with P7500 Series probes Full TriMode support will also allow storage and automatic recall of relevant settings like Offset For more information about oscilloscopes that feature full TriMode support contact Tektronix P7500 TriMode Probe Family Technical Reference 7 Theory of Operation Probing Techniques to Maximize Signal Fidelity Signal fidelity is an indication of how accurately a probe represents the signal being measured The signal fidelity of
42. y Technical Reference 39 User Service Use the following precautions when you solder the tips 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 m 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 P75PDPM Probing Module Equipment Required ground spring tool magnifying glass or microscope Springs tweezers probe holder 2161 011 Figure 37 Large and small springs installed 40 P7500 TriMode Probe Family 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 38 Set the gap 2 Insert the ground spring tool under the top of the spring 2161 023 Figure 39 Insert tool beneath spring P7500 TriMode Probe Family Technical Reference 41 User Service 3 Rock the too
Download Pdf Manuals
Related Search