Tektronix TriMode P7520A Instruction Manual
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Tektronix TriMode P7520A Instruction Manual

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  • Page 1 T h e t e s t & me a s u r e me n t e q u i p me n t y o u n e e d a t t h e p r i c e y o u w a n t . A l l t e s t I n s t r u me n t s , I n c .
  • Page 2 P7520A TriMode™ Probe Instruction Manual *P071304800* 071-3048-00...
  • Page 4 P7520A TriMode™ Probe Instruction Manual www.tektronix.com 071-3048-00...
  • Page 5 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.
  • Page 6 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 will repair the defective product without charge for parts and labor, or will provide a replacement in exchange for the defective product.

  • Page 8: Table Of Contents

    Table of Contents Table of Contents General safety summary ......................Environmental Considerations .
  • Page 9 Table of Contents P7520A Probe Instruction Manual...

  • Page 10: General Safety Summary

    General safety summary General safety summary Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it. To avoid potential hazards, use this product only as specified. Only qualified personnel should perform service procedures. To avoid fire or personal injury Connect and disconnect properly.
  • Page 11 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 on the product These terms may appear on the product: DANGER indicates an injury hazard immediately accessible as you read the marking.

  • Page 12: Environmental Considerations

    The symbol shown below indicates that this product complies with the European Union’s requirements according to Directive 2002/96/EC on waste electrical and electronic equipment (WEEE). For information about recycling options, check the Support/Service section of the Tektronix Web site (www.tektronix.com). Restriction of hazardous substances This product is classified as an industrial monitoring and control instrument accessory, and is not required to comply with the...

  • Page 13: Preface

    Preface Preface This manual describes the installation and operation of the P7520A TriMode Probe. Basic probe concepts, specifications, and maintenance procedures are included in this manual. You can also access the Tektronix Web site for this manual (www.tektronix.com/manuals). Documentation To read about...

  • Page 14: Key Features

    Key Features Key Features The P7520A TriMode Probe allows you to take differential, single-ended, and common mode measurements with one probe connection. Key features include: Revolutionary TriMode operation TekConnect interface Bandwidth (typical) >25 GHz in A – B mode with optional P75PST solder tip @ 100 GS/s >20 GHz in A –...

  • Page 15: Operating Considerations

    Operating Considerations Operating Considerations Table 1: P7520A TriMode Probe Characteristics Characteristic Description Specification ±0.625 V (5X) Input voltage Dynamic range ±1.60 V (12.5X) Input voltage range +3.7 V, –2.0 V (DC + peak AC, both ranges; input referenced to ground) Temperature Operating 0 to +40 °C (+32 °F to +104 °F)

  • Page 16: Installation

    Installation Installation The P7520A probe is capable of measuring signals in excess of 25 GHz bandwidth. However, maximum performance is only available when the probe is used with a P75PST probe tip and an oscilloscope with the TekConnect interface and at least 25 GHz bandwidth.
  • Page 17 Installation Probe Power-On After the initial connection to the oscilloscope is made: 1. The probe briefly lights all LEDs during a self-test, and then one Range and one Mode LED remain lit. 2. If applicable, the probe transfers data to the host instrument, and a message displays on the instrument as the transfer occurs.

  • Page 18: Connecting Accessories To The Probe Body

    Installation Connecting Accessories to the Probe Body CAUTION. The probe has replaceable contacts inside the probe body connector that may stick to the accessory connector when it is disconnected. To prevent damage to the probe, before you connect accessories to the probe body, always check that the contacts are located in the probe body only.

  • Page 19: Control Box Controls And Indicators

    Installation Control Box Controls and Indicators Atten. Button and LEDs After the probe is connected, the host instrument automatically selects the attenuation (voltage range) of the probe, depending on the instrument volts/div setting. You must change the attenuation autoselect feature on the instrument to enable the Atten.
  • Page 20 Installation Input Mode Button and LEDs Press the Input Mode button to select one of the four TriMode measurements. The modes cycle in the following sequence: A – B (for differential signal measurement) A – GND (for A input single-ended measurement) B –...

  • Page 21: Connecting To Your Circuit

    Installation Connecting to Your Circuit Before you connect these tips to your probe, we recommend that you perform a functional test and probe calibration. (See page 9, Functional Check and Calibration.) Procedures for attaching the probe tips are described in Basic Operation. (See page 16, Basic Operation.) Use the P75TLRST Long Reach Solder Tip to connect the probe to your circuit.

  • Page 22: Functional Check And Calibration

    TekConnect Interface Tektronix DPO/DSA72504D Test board TriMode DC Calibration board 067-1821-xx Coaxial cable SMA, 50Ω, male-to-male 174-1120-xx Coaxial cable BNC, 50Ω, male-to-male 012-0208-xx Nine-digit part numbers (xxx-xxxx-xx) are Tektronix part numbers Standard accessory included with probe P7520A Probe Instruction Manual...
  • Page 23 Functional Check and Calibration Test Setup 1. Connect the probe to any channel (1–4) of the oscilloscope. 2. Set the oscilloscope to display the channel. 3. Connect an SMA cable from the Probe Compensation or FAST EDGE output connector on the oscilloscope to the SMA connector on the TriMode DC Calibration board.
  • Page 24 Functional Check and Calibration 9. Cycle the Input Mode button through the remaining selections and compare the displayed waveforms to the waveform that you measured in step 8. A – B (the waveform from step 8) A – GND (same amplitude and polarity as measured in step 8) B –...

  • Page 25: Trimode Probe Calibration

    Functional Check and Calibration TriMode Probe Calibration After you perform a functional check of the probe, run a probe calibration routine. We recommend that you repeat the probe calibration for all four of the TriMode settings, and do this on each channel that you use. The probe calibration operation minimizes measurement errors by optimizing the gain and offset of both probe attenuation settings on each channel.
  • Page 26 Functional Check and Calibration Check the Instrument Calibration Status The Calibration Status of the instrument Signal Path Compensation test must be Pass for the probe calibration routine to run. 1. From the Utilities menu, select Instrument Calibration. 2. In the Calibration box, check that the Status field is Pass.
  • Page 27 Functional Check and Calibration 6. Set the switches on the TriMode DC Calibration board to the positions shown for the selected input mode. (See Table 3.) Table 3: TriMode DC Calibration board switch settings Probe input mode Fast rise/probe cal Gnd/Sig A –...
  • Page 28 Functional Check and Calibration 7. In the menu bar, select Vertical and then select Probe Cal. The Probe Setup screen appears. (Some oscilloscopes support an automated TriMode calibration routine and switch automatically between input modes.) 8. Select Compensate Probe. The probe calibration routine runs, optimizing the probe to the oscilloscope for both probe attenuation settings.

  • Page 29: Basic Operation

    Basic Operation Basic Operation This section includes more information about using the probe controls on the control box and procedures for connecting the probe to your circuit. Maximizing P7520A Signal Bandwidth The bandwidth of the P7520A probe can be maximized to 25 GHz only when the following conditions are met: The host oscilloscope bandwidth must be ≥25 GHz and not be bandwidth limited.

  • Page 30: Connecting To A Circuit Board

    Basic Operation Connecting to a Circuit Board The P75TLRST Long Reach Solder Tip is shipped with the probe. Use the P75TLRST tip to connect the probe to your circuit, or use the optional P75PST TriMode Performance Solder Tip for ≥25 GHz bandwidth measurements. Other TriMode solder tips are available, as well as a handheld probing module, described on the following pages.
  • Page 31 Basic Operation The dimensions of the solder tip connections are provided here for reference. You can also design the tip footprint into your circuit board layout for easier test connections. To connect the probe tip to your circuit, use the wire and solder that are provided in the wire replacement kit.
  • Page 32 Basic Operation Connect the P75TLRST or P75PST Solder Tip You must keep the interconnect wire lengths short (<0.032 in./0.8 mm) to achieve 25 GHz performance with the P75PST Solder Tip. Use the solder tip ramp to position the tip board close to the DUT test points to minimize wire lengths.
  • Page 33 Basic Operation 4. Align the bottom of the tip to the notch in the ramp as shown, and then secure the tip to the ramp with glue or tape. The notch in the ramp helps you to position the tip as close as possible (<0.032 in./0.8 mm) to the circuit connections.
  • Page 34 Basic Operation Connect the TriMode Resistor Solder Tips Use this procedure to connect both styles of resistor tips to your circuit. 1. Choose a location where the solder tip resistor leads can reach your test points. If you are using a ground connection, note which solder tip ground via is closest to your circuit ground.
  • Page 35 Basic Operation Secure the Tip 11. Push the end of the tip into the probe head until it seats in the probe head. 12. For a secure mechanical connection, use tape or hot glue to secure the tip to your circuit. 13.
  • Page 36 Basic Operation Notes on Using the Tips. 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.
  • Page 37 Basic Operation P75PDPM Precision Differential Probing Module (Handheld) This is an optional accessory. (See page 30, Optional Accessories.) Assemble the Module 1. Position the module housing as shown. 2. Slide the probing module handle adapter into the module housing. 3. Secure the handle adapter with the thumbscrew.
  • Page 38 Basic Operation Adjustments 1. Adjust the tip angle by loosening the setscrew and pivoting the tip. Tighten the setscrew to secure the tip. 2. Adjust the tip spacing by turning the adjustment wheel. The probing module is shipped with a ground spring installed between the tips.

  • Page 39: Connecting The Probe To Instruments Without A Tekconnect Interface

    The 80A03 TekConnect Probe Interface adapts any TekConnect probe to the TDS8X00, CSA8X00, and DSA8200 Series oscilloscopes. The RTPA2A TekConnect Probe Interface adapts any TekConnect probe to Tektronix Real-Time Spectrum Analyzers. NOTE. The 80A03 and RTPA2A interfaces are limited to a pass-through bandwidth of 18 GHz.

  • Page 40: Accessories And Options

    Accessories and Options Accessories and Options You can reorder the following replacement parts and accessories. Note that in some cases, the reorder quantities may differ from those that ship with the probe. Standard Accessories The following accessories are shipped with the P7520A probe. If no quantity is listed, only one of that item is shipped. Reorder part number Accessory and quantity...
  • Page 41 Accessories and Options Reorder part number Accessory and quantity Description 174-1120-xx 50 Ω SMA-M to SMA-M cable assembly, 8.5 in. To perform a functional check, use this cable to connect the DC Calibration fixture to the Fast Rise Time output connector on the host instrument.
  • Page 42 Accessories and Options Reorder part number Accessory and quantity Description 016-0633-xx Color band kit. This kit includes two sets of five colored pairs. When you are using more than one probe, the bands (Package of five enable you to visually match the probes to the channels colored pairs) that they are connected to.

  • Page 43: Optional Accessories

    Accessories and Options Optional Accessories Optional accessory Part number Description P75PST TriMode Performance Solder Tip. This tip provides a soldered, multi-point connection that supports full TriMode measurement capabilities at full probe bandwidth. 020-2936-xx TriMode Resistor Solder Tip kit. This tip provides solder connection points at 100 Ω resistors that extend about 0.2 in (5 mm) from the solder tip board.
  • Page 44 Accessories and Options Optional accessory Part number Description 020-2937-xx Replacement resistor kit for TriMode solder tips. This kit includes: 100 Ω leaded resistors, quantity 50 75 Ω surface-mount, 0402 resistors, quantity 50 Nonconductive tubing, quantity 50 P75PDPM Probing module kit. This kit allows you to browse multiple test points in your circuit without using a soldered connection.
  • Page 45 Accessories and Options P75PDPM kit contents Part number Description 016-1998-xx Ground spring kit, large. (Package of 4) The handheld probing module requires a spring to make a ground connection between the ends of the two input tips. Use the large ground spring for general-purpose browsing, when the required span between tips is from 0.050 in.
  • Page 46 Accessories and Options Optional accessory Part number Description 067-1586-xx Deskew fixture. Use this fixture to time-align the probe to other probes connected to your measurement system. PPM203B PPM203B Articulating Arm. This high-precision articulating arm has fine adjustment controls for all three axes.

  • Page 47: Options

    Accessories and Options Optional accessory Part number Description 80A03 80A03 TekConnect Probe Interface Module. Use this module with 80E0X Sampling Modules to adapt TekConnect probes to TDS/CSA8000 and TDS/CSA8200 Series Sampling Oscilloscopes. NOTE. The 80A03 interface is limited to 18 GHz pass-through bandwidth.

  • Page 48: Theory Of Operation

    Theory of Operation Theory of Operation This section discusses operating considerations and probing techniques. The P7520A probe is optimized for high bandwidth; it is not a general-purpose probe. The probe tips are miniaturized for electrical characteristics and access to dense circuitry, and must be handled carefully. CAUTION.
  • Page 49 Theory of Operation The usual choice for attenuation setting should be 5X, if the measured signal fits within the specified dynamic range, since that provides the best noise performance. The probe Offset control can also be used with some signals to compensate for a DC bias and bring the displayed signal within the specified dynamic range.

  • Page 50: Input Voltage Limits

    Theory of Operation Input Voltage Limits The P7520A probe is 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 5 on page 52.) Maximum Input Voltage The maximum input voltage is the maximum voltage to ground that the inputs can withstand without damaging the probe input circuitry.
  • Page 51 Theory of Operation Operating Voltage Window 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 2.) A common-mode voltage that exceeds the operating voltage window may produce an erroneous output waveform even when the differential-mode specification is met.
  • Page 52 Theory of Operation Figure 3: Dynamic range versus linearity, 5X range Figure 4: Dynamic range versus linearity, 12.5X range P7520A Probe Instruction Manual...

  • Page 53: Trimode Operation

    Theory of Operation TriMode Operation The TriMode feature of the 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 with four measurements: differential, positive polarity and negative polarity single-ended, and common mode.
  • Page 54 Theory of Operation Figure 5: 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.

  • Page 55: Probing Techniques To Maximize Signal Fidelity

    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 the probe is best when the probe is applied properly to the circuit with the P7520A probe tips. Recommendations for connecting the probe tips are given in the following section.
  • Page 56 Theory of Operation Figure 8: P75TLRST solder tip with 0.050 in. of tip wire Figure 9: P75TLRST solder tip with 0.100 in. of tip wire P7520A Probe Instruction Manual...
  • Page 57 Theory of Operation Figure 10: P75TLRST solder tip with 0.200 in. of tip wire P7520A Probe Instruction Manual...
  • Page 58 Theory of Operation Solder Tip Ramp For best performance, the solder tip must be placed very close to the circuit (within 0.032 in./0.8 mm). The solder tip ramp is designed to hold the solder tips 0.025 in. (0.6 mm) away from your circuit connections. Align the body of the tip to the notch in the ramp as shown.
  • Page 59 Theory of Operation P75PDPM Precision Differential Probing Module 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 Ω...
  • Page 60 Theory of Operation Figure 12: P75PDPM with short ground spring, 0.030 in. spacing Figure 13: P75PDPM with short ground spring, 0.050 in. spacing P7520A Probe Instruction Manual...
  • Page 61 Theory of Operation Figure 14: P75PDPM with short ground spring, 0.090 in. spacing Figure 15: P75PDPM with short ground spring, 0.180 in. spacing P7520A Probe Instruction Manual...

  • Page 62: Input Impedance And Probe Loading

    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 DC input impedance of 50 kΩ to ground. (See Figure 16.) Figure 16: TriMode probe input model For signals with low source impedance and frequency, the 50 kΩ...
  • Page 63 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. (See page , Contacting Tektronix.) Figure 18: Embedded probe fixture...

  • Page 64: Specifications

    Specifications Specifications These specifications apply to the P7520A TriMode Probe when it is installed on an oscilloscope that has the supporting firmware, DSP capabilities, and a TekConnect interface. 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.

  • Page 65: Typical Characteristics

    Specifications Typical Characteristics Typical characteristics describe typical, but not guaranteed performance with an embedded probe only. Refer to Tip Specifications for specifications when using TriMode accessory tips. Highest performance is achieved when using the P75PST tip with the probe. (See page 56, Tip Specifications.) Table 5: Typical electrical characteristics Characteristic Specification...
  • Page 66 Specifications Characteristic Specification Delay time 4.4 ns ±0.1 ns Common-mode rejection ratio, differential-mode >60 dB at DC >40 dB to 50 MHz >30 dB to 1 GHz >20 dB to 10 GHz >12 dB to 20 GHz Differential-mode rejection ratio, common-mode >40 dB to 50 MHz >30 dB to 1 GHz >20 dB to 9 GHz...
  • Page 67 Specifications Table 6: Typical mechanical characteristics Characteristic Description Dimensions, control box 125.4 mm × 41 mm × 35 mm (4.9 in × 1.6 in × 1.4 in) Dimensions, probe body 101.6 mm × 8.89 mm × 19 mm (4.0 in × 0.350 in × 0.750 in) Dimensions, cable length 1.0 m (39.3 in) (from the probe body to the control box) Unit weight...

  • Page 68: Nominal Characteristics

    Specifications Nominal Characteristics Nominal characteristics describe guaranteed traits, but the traits do not have tolerance limits. Table 7: Nominal electrical characteristics Characteristic Description Input configuration P75PST solder tip Differential (two signal inputs, A and B; shared with single-ended) P75TLRST solder tip Single-ended (one each A and B signal input and two ground inputs) TriMode Resistor &...

  • Page 69: Tip Specifications

    Specifications Tip Specifications This section lists specifications that are applicable to the probe when used with the accessory tips available for the probe. All solder tips must be connected to the circuit with the shortest leads possible (typically <0.032 in./0.8 mm). Solder ramp accessories are included with the probe to help you minimize the lead lengths.
  • Page 70 Specifications P75PST Performance Solder Tip Specifications are typical and apply to all ranges and input modes unless specified otherwise. To achieve the highest performance in differential (A–B) mode, the host instrument bandwidth must be ≥25 GHz with a sample rate of 100 GS/s. The soldered wires between the tip and your circuit must be kept as short as possible (typically <0.032 in./0.8 mm).
  • Page 71 Specifications The following figure shows the typical step response of the probe with the P75PST solder tip. A 25 ps rise time pulse source was used for this measurement. Figure 21: TriMode probe with the P75PST solder tip P7520A Probe Instruction Manual...
  • Page 72 Specifications The following figure shows a typical impedance plot of the probe with the P75PST solder tip. Figure 22: P75PST differential impedance P75TLRST TriMode Long Reach Solder Tip Bandwidth Rise time CMRR DMRR Channel isolation >20 GHz, A–B mode 10%–90%: >60 dB at DC >40 dB at 50 MHz >40 dB at 50 MHz...
  • Page 73 Specifications Figure 23: P75TLRST TriMode Long Reach Solder Tip dimensions P7520A Probe Instruction Manual...
  • Page 74 Specifications The following figure shows the typical step response of the probe with the P75TLRST solder tip. A 50 ps rise time pulse source was used for this measurement. Figure 24: TriMode probe with the P75TLRST solder tip P7520A Probe Instruction Manual...
  • Page 75 Specifications The following figure shows a typical impedance plot of the probe with the P75TLRST solder tip. Figure 25: P75TLRST differential impedance P7520A Probe Instruction Manual...
  • Page 76 Specifications TriMode Resistor Solder Tip Specifications are typical and apply to all ranges and input modes unless specified otherwise. Bandwidth Rise time CMRR DMRR Channel isolation >40 dB at 50 MHz >40 dB at 50 MHz >18.0 GHz, A–B 10%–90%: >60 dB at DC mode <29 ps, A–B mode...
  • Page 77 Specifications The following figure shows the typical step response of the probe with the TriMode resistor solder tip. A 50 ps rise time pulse source was used for this measurement. Figure 27: Step response with the TriMode Resistor solder tip The following figure shows a typical impedance plot of the probe with the TriMode resistor solder tip.
  • Page 78 Specifications TriMode Extended Resistor Solder Tip Specifications are typical and apply to all ranges and input modes unless specified otherwise. Bandwidth Rise time CMRR DMRR Channel isolation >7 GHz, A–B 10%–90%: >60 dB at DC >40 dB at 50 MHz >40 dB at 50 MHz mode <32 ps, A–B mode...
  • Page 79 Specifications The following figure shows the typical step response of the probe with the TriMode extended resistor solder tip. A 50 ps rise time pulse source was used for this measurement. Figure 30: Step response with the TriMode Extended Resistor solder tip The following figure shows a typical impedance plot of the probe with the TriMode extended resistor solder tip.
  • Page 80 Specifications P75PDPM Precision Differential Probing Module Specifications are typical and apply to all ranges and input modes unless specified otherwise. Bandwidth Rise time CMRR >18.0 GHz 10%–90%: <29 ps >60 dB at DC >40 dB at 50 MHz 20%–80%: <20 ps >30 dB at 1 GHz >20 dB at 10 GHz >15 dB at 20 GHz...
  • Page 81 Specifications The following figure shows the typical step response of the probe with the P75PDPM probing module. A 50 ps rise time pulse source was used for this measurement. Figure 33: TriMode probe with the P75PDPM probing module P7520A Probe Instruction Manual...
  • Page 82 Specifications The following figure shows the typical differential impedance of the probe with the P75PDPM probing module. Figure 34: P75PDPM differential impedance P7520A Probe Instruction Manual...

  • Page 83: Service

    If one of the Range or TriMode LEDs does not remain lit 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. Atten (Range) Setting If you cannot change the attenuation by pressing the Atten.
  • Page 84 Service Perform a functional check using the TriMode calibration board included with the probe. (See page 9, Functional Check.) Check that the bullet contacts are present and intact in the probe body. (See page 75, Inspecting the Bullets and Connectors.) Input Mode/Probe Tip Selection If you cannot select an Input Mode other than A –...

  • Page 85: Replaceable Parts

    Service Replaceable Parts 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 8: TriMode probes replaceable parts Description Replacement part number Probe body bullet contacts...
  • Page 86 Ground spring tool Custom tool Tweezers General purpose Magnifying glass or microscope Free standing to allow hands-free use Probe positioner or bench vise Able to hold probe PPM203B or PPM100 Nine-digit part numbers (xxx-xxxx-xx) are Tektronix part numbers. P7520A Probe Instruction Manual...
  • Page 87 Service Bullet Contacts The input sockets in the probe body assembly are protected by replaceable bullet contacts. (Replaceable bullets are included in the accessory kit.) The bullet contacts protect the input sockets by absorbing the wear from repeated connect/disconnect cycles of the accessory tips.
  • Page 88 Service Inspecting the Bullets and Connectors Use a microscope to closely examine the bullets and connectors. Use the illustrations to determine if the contacts appear worn or broken, and always replace them in pairs. 1. Good 2. Chipped or bent ground contacts (outer conductor) 3.
  • Page 89 NOTE. Axial-leaded tip resistors (included in the TriMode resistor replacement kit, Tektronix part number 020-2937-xx), should not be used in place of wires with the P75TLRST or P75PST probe tips unless the surface-mount, SMD0402 resistors are also changed.
  • Page 90 Service Replacing the TriMode Solder Tip Resistors The resistors that are presoldered to the tips can break off during normal use. A kit of replacement resistors is available. (See page 30, Optional Accessories.) To replace the resistors, do the following: 1.
  • Page 91 Service P75PDPM Probing Module Springs Equipment Required: ground spring tool tweezers probe holder magnifying glass or microscope Large and small springs shown installed Remove the Spring 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.
  • Page 92 Service 2. Insert the ground spring tool under the top of the spring. P7520A Probe Instruction Manual...
  • Page 93 Service 3. Rock the tool away from the tips so that the spring clears the seat edge. 4. Gently pull the tool away; the spring should come away with the tool. 5. Put the spring in the accessory container or a safe place to avoid losing the spring. Install.
  • Page 94 Service 2. 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. 3. Set the bottom of the spring in the front seats (those closest to the tip ends).
  • Page 95 Service 4. 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. 5. Gently retract the tool from the spring. Verify that the spring is seated as shown. P7520A Probe Instruction Manual...
  • Page 96 Service P75TC Probing Module Tip Cable Equipment Required: connector separator tool 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. 2. Repeat for the other cable and then pull both cables away from the tip connectors.
  • Page 97 Service P75PMT Probing Module Tips (Left and Right) Equipment Required: connector separator tool tweezers probe holder magnifying glass or microscope (preferred) 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.
  • Page 98 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. 8. Press the bottom of the board to snap it past the bottom tabs. 9.

  • Page 99: Handling The Probe

    Service Handling the Probe This probe is a precision high-frequency device; exercise care when you use and store the probe. The probe and cable are susceptible to damage caused by careless use. Always handle the probe at the control box and probe body to avoid undue physical strain to the probe cable, such as kinking, excessive bending, or pulling.

  • Page 100: Cleaning The Probe

    Service Cleaning the Probe CAUTION. To prevent damage to the probe, do not expose it to sprays, liquids, or solvents. Avoid getting moisture inside the probe during exterior cleaning. Do not use chemical cleaning agents; they may damage the probe. Avoid using chemicals that contain benzine, benzene, toluene, xylene, acetone, or similar solvents.

  • Page 101: Returning The Probe For Servicing

    Service Returning the Probe for Servicing If your probe requires servicing, you must return it to Tektronix. If the original packaging is unfit for use or not available, use the following packaging guidelines: Preparation for Shipment 1. Use a corrugated cardboard shipping...

  • Page 102: Index

    Index Index Error conditions Input Mode, 71 Accessories Probe Range & TriMode LEDs, 70 optional, 30 calibrating, 13 signal display, 70 standard, 27 cleaning, 87 Adjustments, 25 compensating, 15 Controls screen, 6 embedded, 50 Firmware, 70 handling, 86 Functional check, 9 Bullet Contacts, 74 loading, 49 inspecting, 75...
  • Page 103 Index TriMode operation, 40 TriMode Solder Tip Extended Resistor, 17, 30 replacing resistors, 77 Resistor, 17, 30 P7520A Probe Instruction Manual...

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