Tektronix TCP312 Service Manual
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Tektronix TCP312 Service Manual

Tcpa300 series; tcpa400 series ac/dc current probes
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TCPA300/400 Amplifiers &
TCP300/400 Series AC/DC Current Probes
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Service Manual
*P077032300*
077-0323-00

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Summary of Contents for Tektronix TCP312

  • Page 1 TCPA300/400 Amplifiers & TCP300/400 Series AC/DC Current Probes Service Manual *P077032300* 077-0323-00...

  • Page 3: Service Manual

    This document applies for firmware version 1.0 and above. Warning The servicing instructions are for use by qualified personnel only. To avoid personal injury, do not perform any servicing unless you are qualified to do so. Refer to all safety summaries prior to performing service. www.tektronix.com 077-0323-00...
  • Page 4 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 5 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.

  • Page 7: Table Of Contents

    AC Coupling ....................Degauss ......................Current Overload Test (TCPA300 Only) ..............TCPA300 Amplifier Test Record ................TCPA400 Test Record..................TCP305 and TCP312 Performance Verification ............... Required Test Equipment ..................DC Gain Accuracy.................... Rise Time ...................... Bandwidth ..................... TCP305 Current Probe Test Record ................
  • Page 8 TCPA400 Amplifier ..................TCP305 and TCP312 Adjustments ................Required Test Equipment ..................Accessing the Adjustments .................. TCP305 and TCP312 DC Gain Adjustment ............... TCP303 and TCP404XL Adjustments ................Required Test Equipment ..................Adjustment Locations ..................TCP303 and TCP404XL Transient Response and Coarse Gain Adjustment ......
  • Page 9 Figure 5: Setup for degaussing the current probe .............. Figure 6: Overload test setup..................Figure 7: DC gain accuracy test setup for TCP305 and TCP312 ..........Figure 8: Rise time test setup for the TCP305 and TCP312 ..........Figure 9: Bandwidth test setup for TCP305 and TCP312 ............
  • Page 10 Table of Contents Figure 40: TCPA300 and TCPA400 optional accessories............. Figure 41: TCP305 and TCP312 replaceable parts ............Figure 42: TCP303 replaceable parts ................Figure 43: TCP404XL replaceable parts................ TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual...
  • Page 11 Table 11: Required test equipment ................Table 12: Equipment settings for DC gain accuracy ............Table 13: DC gain accuracy test for the TCP305 and TCP312..........Table 14: Equipment settings for rise time ..............Table 15: Equipment settings for bandwidth ..............
  • Page 12 Table 40: TCPA300 and TCPA400 standard accessories parts list........... Table 41: TCPA300 and TCPA400 optional accessory parts list..........Table 42: TCP305 and TCP312 replaceable parts list ............Table 43: TCP303 replaceable parts list ................ Table 44: TCP404XL replaceable parts list ..............

  • Page 13: 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. While using this product, you may need to access other parts of a larger system.
  • Page 14 General Safety Summary Do not connect a current probe to any wire that carries voltages above the current probe voltage rating. Power Disconnect. The power switch disconnects the product from the power source. See instructions for the location. Do not block the power switch; it must remain accessible to the user at all times.
  • Page 15 General Safety Summary The following symbol(s) may appear on the product: TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual...

  • Page 16: Service Safety Summary

    Service Safety Summary Service Safety Summary Only qualified personnel should perform service procedures. Read this Service Safety Summary and the General Safety Summary before performing any service procedures. Do Not Service Alone. Do not perform internal service or adjustments of this product unless another person capable of rendering first aid and resuscitation is present.

  • Page 17: Compliance Information

    IEC 61000-4-6:2003. Conducted RF immunity IEC 61000-4-11:2004. Voltage dips and interruptions immunity EN 61000-3-2:2006. AC power line harmonic emissions EN 61000-3-3:1995. Voltage changes, fluctuations, and flicker European Contact. Tektronix UK, Ltd. Western Peninsula Western Road Bracknell, RG12 1RF United Kingdom This product is intended for use in nonresidential areas only.
  • Page 18 Compliance Information Australia / New Zealand Complies with the EMC provision of the Radiocommunications Act per the following standard. Declaration of Conformity – EMC CISPR 11:2003. Radiated and Conducted Emissions, Group 1, Class A, in accordance with EN 61326-1:2006 and EN 61326-2-1:2006. FCC –...

  • Page 19: Environmental Considerations

    Union requirements according to Directives 2002/96/EC and 2006/66/EC on waste electrical and electronic equipment (WEEE) and batteries. For information about recycling options, check the Support/Service section of the Tektronix Web site (www.tektronix.com). Restriction of Hazardous This product has been classified as Monitoring and Control equipment, and is outside the scope of the 2002/95/EC RoHS Directive.
  • Page 20 Compliance Information TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual...

  • Page 21: Preface

    The current probes covered in this manual are listed below: TCP312 (30 A, 100 MHz, compatible with TCPA300) TCP305 (50 A, 50 MHz, compatible with TCPA300) TCP303 (150 A, 15 MHz, compatible with TCPA300)
  • Page 22 Preface TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual...

  • Page 23: Performance Verification Overview

    The warranted specifications for the probes that are checked in the performance verification procedures are listed as shown. (See Table 2.) Table 2: Probe performance verification checks Probe DC gain accuracy Bandwidth Risetime TCP312 TCP305 TCP303 TCP404XL TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual...

  • Page 24: Test Procedure Conditions

    Performance Verification Overview Test Procedure Conditions These procedures are valid only under the following conditions: The system has been calibrated at an ambient temperature of 23 ° ±5 °C. The system is operating in an environment whose limits are described in the Specifications section.

  • Page 25: Tcpa300 And Tcpa400 Performance Verification

    (See page 4, Making DC Current Loops.) Tektronix part number 174-4765-00 Calibration Adapter TCPA Calibration Adapter Current Probe TCPA300/400-compatible probe Tektronix TCP303, 305, or 312 (TCPA300) or TCP404XL (TCPA400) Required for functional test only. TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual...

  • Page 26: Making Dc Current Loops

    TCPA300 and TCPA400 Performance Verification Making DC Current Loops You need to construct simple current loops to complete some tests for the amplifiers. The current loops are also used in the DC gain accuracy tests for the probes. 5-Turn DC Current Loop Construct the loop using a cylindrical form approximately 3 inches in diameter: 1.

  • Page 27: Front-Panel Display

    TCPA300 and TCPA400 Performance Verification Front-Panel Display The status and error LEDs on the front panel are illuminated briefly during the amplifier power-on sequence. Verify that all LEDs are functional by doing the following procedure: 1. Power-cycle the amplifier and check that the LEDs light briefly. Note that the PROBE DEGAUSS AUTOBALANCE and OVERLOAD LEDs are multi-color: a.

  • Page 28: Dc Gain Accuracy

    TCPA300 and TCPA400 Performance Verification DC Gain Accuracy Use the following procedure to verify the DC gain accuracy of the amplifier. Test Equipment Setup Set up the test equipment as follows: 1. Connect the output of the amplifier to the DMM: a.

  • Page 29: Table 4: Equipment Settings

    TCPA300 and TCPA400 Performance Verification 3. Make or verify the equipment settings as shown: Table 4: Equipment settings Digital multimeter Measurement Type DC volts Range Autoranging Current source Voltage Current 100 mA Output TCPA300 and TCPA400 amplifier Coupling Procedure After the equipment is set up, proceed as follows: 4.
  • Page 30 TCPA300 and TCPA400 Performance Verification For example, using an expected output V of 2.5000 V and a measured output M of 2.510, the %Error would be: NOTE. It is important that the correct polarity be used to calculate the % Error. 6.

  • Page 31: Bandwidth

    Figure 3: Bandwidth test setup 1. If you are using a Tektronix oscilloscope that supports the TekProbe Level 2 Interface, use the TekProbe Interface Cable to connect the amplifier OUTPUT to the oscilloscope input. If you are not using a Tektronix oscilloscope that supports the TekProbe Level 2 Interface, use a 50 Ω...
  • Page 32 TCPA300 and TCPA400 Performance Verification Table 6: Equipment settings for bandwidth check (cont.) Trigger mode Auto Trigger position Acquisition mode Average Number of waveforms to average Measurement type Peak-to-Peak Leveled sine wave generator Frequency 3 MHz Amplitude TCPA300 ~3.0 V TCPA400 1.0 V TCPA300 and TCPA400...
  • Page 33 TCPA300 and TCPA400 Performance Verification 4. Connect the Calibration Adapter to the output of the leveled sine wave generator. 5. Enable the output of the leveled sinewave generator. 6. Verify the amplifier output is what is listed for the TCPA300 amplifier. (See Table 7 on page 12.) The TCPA400 amplifier output is also listed.

  • Page 34: Table 7: Tcpa300 Bandwidth Measurements

    TCPA300 and TCPA400 Performance Verification Table 7: TCPA300 bandwidth measurements TEKPROBE Interface Cable Coaxial cable Bandwidth Vertical Amplifier Vertical Amplifier filter and gain output, gain output, generator Correction Range setting setting frequency factor 1 A/V 500 mA/div ~3 A 500 mV/div ~3 V 50 MHz 1.09...

  • Page 35: Ac Coupling

    TCPA300 and TCPA400 Performance Verification AC Coupling The following test checks that the AC coupling circuit of the amplifier functions properly. First, you measure a square-wave signal in DC coupling mode and record the value, and then switch to AC coupling and measure the signal amplitude. Figure 4: AC coupling test setup To perform the check, do the following: 1.

  • Page 36: Degauss

    TCPA300 and TCPA400 Performance Verification Table 9: TCPA300 and TCPA400 AC coupling measurements TEKPROBE Interface Cable BNC coaxial cable Minimum Maximum Minimum Maximum Square wave Vertical coupled coupled coupled Vertical coupled coupled coupled generator gain amplifier amplifier amplifier gain amplifier amplifier amplifier Amplifier...

  • Page 37: Current Overload Test (Tcpa300 Only)

    TCPA300 and TCPA400 Performance Verification Current Overload Test (TCPA300 Only) This test checks the functionality of the TCPA300 current overload detection circuit using the setup shown. You set the current source to output the maximum rated current for the probe/amplifier you are testing, and then increase the current source to a level that engages the overload circuit (the OVERLOAD LED is on).

  • Page 38: Table 10: Maximum Current Ratings For Tcpa300-Compatible Probes

    Table 10: Maximum current ratings for TCPA300-compatible probes Maximum Current current Current loop source Probe model Range rating, Amps used for test output, Amps TCP312 10 A/V ±30 ±6 TCP305 10 A/V ±50 ±10 TCP303 50 A/V ±212 50 T ±4.24...

  • Page 39: Tcpa300 Amplifier Test Record

    TCPA300 and TCPA400 Performance Verification TCPA300 Amplifier Test Record Photocopy this form and use it to record the performance test results. TCPA300 test record Instrument Serial Number: Certificate Number: Temperature: Relative Humidity %: Date of Calibration: Technician: Performance test Range, A/V Minimum Measured/calculated Maximum...

  • Page 40: Tcpa400 Test Record

    TCPA300 and TCPA400 Performance Verification TCPA400 Test Record Photocopy this form and use it to record the performance test results. TCPA400 test record Instrument Serial Number: Certificate Number: Temperature: Relative Humidity %: Date of Calibration: Technician: Performance test Minimum Measured/calculated Maximum Front-Panel Display Pass/Fail...

  • Page 41: Tcp305 And Tcp312 Performance Verification

    TERMINATED INTO 50 Ω status LED is on. Verify that the 50 Ω termination is connected at the DMM input when performing the following procedures. No probe or amplifier adjustments are required during these test procedures. If any tests fail, information is available. (See page 50, TCP305 and TCP312 DC Gain Adjustment.) WARNING.

  • Page 42: Required Test Equipment

    TCP305 and TCP312 Performance Verification Required Test Equipment To perform the acceptance tests in this section, you will need the test equipment listed. The test equipment must meet or exceed the specifications listed. The test procedures may need to be modified if the recommended equipment is not used.

  • Page 43: Dc Gain Accuracy

    TCP305 and TCP312 Performance Verification DC Gain Accuracy This procedure tests the DC gain accuracy of the TCP305 and TCP312 Current Probes. In this test you compare the voltage output of the amplifier to a reference input. This test uses current loops that you make using wire and 3-inch forms.

  • Page 44: Table 12: Equipment Settings For Dc Gain Accuracy

    TCP305 and TCP312 Performance Verification Equipment Settings Make or verify the equipment settings in the table below: (See Table 12.) Table 12: Equipment settings for DC gain accuracy Digital multimeter Measurement Type DC volts Range Autoranging Current source Amplitude DC A...

  • Page 45: Table 13: Dc Gain Accuracy Test For The Tcp305 And Tcp312

    TCP305 and TCP312 Performance Verification Table 13: DC gain accuracy test for the TCP305 and TCP312 Current Expected source output, V M1-M2 %Error, Probe Range output (ADC) (VAC) M1 (VDC) M2 (VDC) (VDC) calculated TCP305 5 A/V ±1.00 A ±1.00 V ±3.00 A...

  • Page 46: Rise Time

    TCP305 and TCP312 Performance Verification Rise Time This procedure measures the rise time of the TCP305 and TCP312 Current Probes. In this test you directly measure the rise time of a step input. Setup equipment connections. Figure 8: Rise time test setup for the TCP305 and TCP312 Equipment Connections 1.

  • Page 47: Table 14: Equipment Settings For Rise Time

    TCP305 and TCP312 Performance Verification Table 14: Equipment settings for rise time Oscilloscope Vertical input 50 Ω impedance Vertical scale 200 mA/division Time base 2 ns/division Record length Coupling Offset 0 V (mid-scale) Trigger type Edge Trigger mode Auto Trigger position...

  • Page 48: Bandwidth

    Figure 9: Bandwidth test setup for TCP305 and TCP312 Equipment Connections 1. If you are using a Tektronix oscilloscope that supports the TekProbe Level 2 Interface, use the TekProbe Interface Cable to connect the amplifier OUTPUT to the oscilloscope input. If you are not using a Tektronix oscilloscope that supports the TekProbe Level 2 Interface, use a 50 Ω...

  • Page 49: Table 15: Equipment Settings For Bandwidth

    TCP305 and TCP312 Performance Verification Equipment Settings Make or verify the listed equipment settings. Table 15: Equipment settings for bandwidth Oscilloscope Vertical input impedance 50 Ω Time base 200 ns/division Record length Coupling Offset 0 V (mid-scale) Trigger type Edge...

  • Page 50: Table 16: Bandwidth Test For The Tcp305 And Tcp312

    TCP312: This completes the performance verification for the TCP305 and TCP312 probes. If the TCP305 and TCP312 probes fail any of the verification tests, refer to the Adjustments section for servicing information. TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual...

  • Page 51: Tcp305 Current Probe Test Record

    TCP305 and TCP312 Performance Verification TCP305 Current Probe Test Record Photocopy this form and use it to record the performance test results. TCP305 test record Instrument Serial Number: Certificate Number: Temperature: Relative Humidity %: Date of Calibration: Technician: Range, Performance test...

  • Page 52: Tcp312 Current Probe Test Record

    TCP305 and TCP312 Performance Verification TCP312 Current Probe Test Record Photocopy this form and use it to record the performance test results. TCP312 test record Instrument Serial Number: Certificate Number: Temperature: Relative Humidity %: Date of Calibration: Technician: Range, Performance test...

  • Page 53: Tcp303 And Tcp404Xl Performance Verification

    TCP303 and TCP404XL Performance Verification TCP303 and TCP404XL Performance Verification The test procedures in this section verify warranted specifications and proper performance of the TCP303 and TCP404XL Current Probes, using the appropriate amplifier. Tolerances that are specified in these procedures apply to the amplifier and current probe and do not include test equipment error.

  • Page 54: Equipment Required

    Digital Multimeter DCV: 0.1% accuracy, 5 digit Keithley 2700 resolution Current Probe Amplifier Use appropriate amplifier Tektronix TCPA300 or TCPA400 BNC Cable 50 Ω, 0.76 m (30 in) long Tektronix part number 012-0117-00 Cable TEKPROBE Interface Tektronix part number 012-1605-00...

  • Page 55: Dc Gain Accuracy

    TCP303 and TCP404XL Performance Verification DC Gain Accuracy This procedure tests the DC gain accuracy of the TCP303 and TCP404XL. In this test you compare the voltage output of the amplifier to a reference input. This test uses a 50-turn current loop that you make using wire and a 3-inch form.
  • Page 56 TCP303 and TCP404XL Performance Verification Procedure 1. Do not clamp the current probe around any conductor, but make sure the jaws are locked shut. 2. Press the amplifier PROBE DEGAUSS AUTOBALANCE button. Wait for the degauss/autobalance routine to complete before proceeding. The routine is complete when the indicator light turns green.

  • Page 57: Table 19: Dc Gain Accuracy Test Worksheet For The Tcp303 And Tcp404Xl

    TCP303 and TCP404XL Performance Verification 5. Record the results on the test record. Table 19: DC gain accuracy test worksheet for the TCP303 and TCP404XL Current source output Expected output, V M1-M2 % Error, Probe Range (ADC) (VAC) M1 (VDC) M2 (VDC) (VDC) calculated...

  • Page 58: Rise Time

    Figure 11: Rise time test setup for the TCP303 and TCP404XL Equipment Connections 1. If you are using a Tektronix oscilloscope that supports the TekProbe Level 2 Interface, use the TekProbe Interface Cable to connect the amplifier OUTPUT to the oscilloscope input. If you are not using a Tektronix oscilloscope that supports the TekProbe Level 2 Interface, use a 50 Ω...

  • Page 59: Table 20: Equipment Settings For Rise Time

    TCP303 and TCP404XL Performance Verification Equipment Settings Make or verify the equipment settings in the table below: (See Table 20.) Table 20: Equipment settings for rise time Oscilloscope Vertical scale: TCP303 200 mA/division TCP404XL 1 A/division Vertical input impedance 50 Ω Time base: TCP303 10 ns/division...
  • Page 60 TCP303 and TCP404XL Performance Verification Procedure 1. Do not clamp the current probe around any conductor, but make sure the jaws are locked shut. 2. Press the amplifier PROBE DEGAUSS AUTOBALANCE button. Wait for the degauss/autobalance routine to complete before proceeding. The routine is complete when the indicator light turns green.

  • Page 61: Bandwidth (Tcp303)

    Figure 12: Bandwidth test setup for TCP303 Equipment Connections 1. If you are using a Tektronix oscilloscope that supports the TekProbe Level 2 Interface, use the TekProbe Interface Cable to connect the amplifier OUTPUT to the oscilloscope input. If you are not using a Tektronix oscilloscope that supports the TekProbe Level 2 Interface, use a 50 Ω...

  • Page 62: Table 21: Equipment Settings For Bandwidth

    TCP303 and TCP404XL Performance Verification Equipment Settings Make or verify the equipment settings in the table below. (See Table 21.) Table 21: Equipment settings for bandwidth Oscilloscope Vertical input impedance 50 Ω Time base 200 ns/division Record length Coupling Offset 0 V (mid-scale) Trigger type Edge...

  • Page 63: Bandwidth (Tcp404Xl)

    TCP303 and TCP404XL Performance Verification Table 22: Bandwidth test for the TCP303 TEKPROBE Interface Cable BNC cable M2 @ Oscilloscope TCPA300 Oscilloscope TCPA300 @3 MHz warranted BW Probe Range vertical gain output vertical gain output ref freq freq (15 MHz) Calculation TCP303 5 A/V 10 mA/div...

  • Page 64: Tcp303 Current Probe Test Record

    TCP303 and TCP404XL Performance Verification TCP303 Current Probe Test Record Photocopy this form and use it to record the performance test results. TCP303 test record Instrument Serial Number: Certificate Number: Temperature: Relative Humidity %: Date of Calibration: Technician: Performance test Range, A/V Test Minimum...

  • Page 65: Tcp404Xl Current Probe Test Record

    TCP303 and TCP404XL Performance Verification TCP404XL Current Probe Test Record Photocopy this form and use it to record the performance test results. TCP404XL test record Instrument Serial Number: Certificate Number: Temperature: Relative Humidity %: Date of Calibration: Technician: Performance test Range Test Minimum...
  • Page 66 TCP303 and TCP404XL Performance Verification TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual...

  • Page 67: Adjustment Procedures Overview

    Adjustment information you can make to the amplifiers and probes is available. (See Table 23.) Table 23: Amplifier and probe adjustments Adjustments Device DC gain accuracy Low frequency High frequency Amplifiers TCPA300 (4 adjustments) TCPA400 Probes TCP312 TCP305 TCP303 TCP404XL TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual...

  • Page 68: Tcpa300 And Tcpa400 Amplifier Adjustments

    ±50 mV Current Source 0.1%, 0 to ±100 mA Fluke 5100 A or HP 6612C Termination 50 Ω ±0.1%, 0.5 W Tektronix part number 011-0129-00 BNC Cables 50 Ω, 1.05 m (42 in) long Tektronix part number 012-0117-00 Cables TEKPROBE Interface...

  • Page 69: Tcpa300 Amplifier

    TCPA300 and TCPA400 Amplifier Adjustments TCPA300 Amplifier The TCPA300 has four internal adjustments that affect the gain of the amplifier. (The TCPA400 has one adjustment.) Each range has an individual control, except the 1 A/V range, which does not have an adjustment. To make adjustments to the amplifier, do the following: 1.

  • Page 70: Tcpa400 Amplifier

    TCPA300 and TCPA400 Amplifier Adjustments Figure 14: Gain adjustment locations TCPA400 Amplifier The TCPA400 has one internal gain adjustment in the amplifier. To make adjustments to the amplifier, do the following: 1. Set up the circuit shown. (See Figure 13 on page 47.) 2.

  • Page 71: Tcp305 And Tcp312 Adjustments

    TCP305 and TCP312 Adjustments TCP305 and TCP312 Adjustments The TCP305 and TCP312 Current Probes have one characteristic that is adjustable–DC gain. The following text describes the DC gain adjustment procedure. Tolerances that are specified in these procedures apply to the current probes and do not include test equipment error.

  • Page 72: Tcp305 And Tcp312 Dc Gain Adjustment

    TCP305 and TCP312 Adjustments TCP305 and TCP312 DC Gain Adjustment Use the following procedure to adjust the DC gain of the TCP305 and TCP312 Probes. Equipment Connections 1. Connect the amplifier OUTPUT to the DMM input using a BNC-to-Dual Banana connector, 50 Ω BNC cable, and a 50 Ω precision feedthrough termination.

  • Page 73: Figure 16: Dc Gain Adjustment Setup For Tcp305 And Tcp312

    60 mA 0.3008 0.2997 0.3018 This completes the adjustments for the TCP305 and TCP312 Current Probes. Do the appropriate performance verification procedure for the probe you adjusted, using these procedures. (See page 19, TCP305 and TCP312 Performance Verification.) TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual...

  • Page 74: Tcp303 And Tcp404Xl Adjustments

    Square wave with a rise time <35 ns, ≥5 A into AVTECH AVR-3-PW-C-P-TEK2 Generator (TCP404XL only) 50 Ω Current Probe Amplifier Tektronix TCPA300 (TCP303) or TCPA400 (TCP404XL) AC Current Source AC A: 0.25% accuracy, 0 to ±5 A, square wave Wavetek 9100 output, 40 Hz-1 kHz, t <10 ms...

  • Page 75: Adjustment Locations

    TCP303 and TCP404XL Adjustments Adjustment Locations The location of the probe adjustments is shown below. (See Figure 17.) Figure 17: TCP303 and TCP404XL adjustment locations TCP303 and TCP404XL Transient Response and Coarse Gain Adjustment These procedures describe how to adjust and optimize the transient response and coarse gain adjustment of the TCP303 and TCP404XL probes, using the 1 ms, 10 ms, and DC gain adjustments.

  • Page 76: Figure 18: Tcp303 And Tcp404Xl Transient Response And Coarse Gain Adjustment Setup

    1. If you are using a Tektronix oscilloscope that supports the TEKPROBE Level 2 Interface, use the TEKPROBE Interface Cable to connect the amplifier OUTPUT to the oscilloscope input. If you are not using a Tektronix oscilloscope that supports the TEKPROBE Level 2 Interface, use a 50 Ω...

  • Page 77: Table 31: Settings For Transient Response And Preliminary Gain Adjustments

    TCP303 and TCP404XL Adjustments Equipment Settings Make or verify the listed equipment settings. Table 31: Settings for transient response and preliminary gain adjustments TCPA300 and TCPA400 Coupling Range: 5 A/V TCPA300 Oscilloscope Vertical Gain: TCP303 Using TEKPROBE Cable: 100 mA/division Using BNC Cable: 20 mV/division TCP404XL...
  • Page 78 TCP303 and TCP404XL Adjustments TCP303 Procedure 1. Remove the access plugs that cover the DC gain, 10 μs, and 1 ms adjustments on the probe. 2. Preset the probe adjustments: The adjustment locations are shown. (See Figure 17 on page 53.) Do this only at the beginning of the probe adjustment process.
  • Page 79 TCP303 and TCP404XL Adjustments TCP404XL Procedure 1. Move the oscilloscope trace to one graticule line from the bottom of the screen. 2. Do not clamp the current probe around any conductor, but make sure the jaws are locked shut. 3. Remove the probe access plugs for 1 ms, 10 ms, and DC Gain. 4.

  • Page 80: Dc Gain Adjustment

    TCP303 and TCP404XL Adjustments DC Gain Adjustment This procedure adjusts the DC gain accuracy of the TCP303 and TCP404XL probes. Equipment Connections 1. Connect the amplifier OUTPUT to the DMM input using a BNC-to-Dual Banana connector, 50 Ω BNC cable, and a 50 Ω precision feedthrough termination.

  • Page 81: Table 32: Equipment Settings For Dc Gain Accuracy

    TCP303 and TCP404XL Adjustments Equipment Settings Make or check the equipment settings below. (See Table 32.) Table 32: Equipment settings for DC gain accuracy Digital multimeter Measurement Type AC volts, autorange Current source Output wave shape/frequency Square wave, 40 Hz Output TCPA300 and TCPA400 Coupling...
  • Page 82 TCP303 and TCP404XL Adjustments TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual...

  • Page 83: Maintenance

    Maintenance This section describes the preventive maintenance and repair procedures for the amplifiers and probes. Service Strategy The amplifiers have some mechanical and electrical parts that may be replaced by the user. The probes can also be repaired to component level. Preventive Maintenance The TCPA300 and TCPA400 Current Probe Amplifiers and current probes require little maintenance during normal use.

  • Page 84: Disassembly

    Disassembly Disassembly To access the internal adjustments or to replace internal components of the amplifiers, you need to remove the instrument case and internal covers. This section covers the disassembly of the amplifiers. Current probe procedures are described later in this section. Amplifiers Use these procedures when making adjustments or replacing components in the amplifiers.

  • Page 85: Removing The Outer Case And Internal Covers

    Disassembly Removing the Outer Case and Internal Covers To replace internal components, you need to remove the outer case and internal covers. You may also want to remove the case and covers to access the internal adjustments. The following procedures describe the removal process: 1.

  • Page 86: Figure 21: Removing The Right-Side Inner Panel

    Disassembly 3. Remove the 6 screws that secure the right-side inner panel to the chassis. Figure 21: Removing the right-side inner panel TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual...

  • Page 87: Figure 22: Removing The Left-Side Inner Panel

    Disassembly 4. Remove the 4 screws that secure the left-side inner panel to the chassis. Figure 22: Removing the left-side inner panel You now have exposed access to the amplifier adjustments. If you need to replace any of the internal components, refer to the following instructions. TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual...

  • Page 88: Replacing The Front Panel Assembly

    Disassembly Replacing the Front Panel Assembly If you need to replace the Front Panel Assembly, do the following: 1. Wear an antistatic wriststrap when handling the circuit assemblies. 2. Using pliers, remove the heat sink clip from U9 as shown. Figure 23: Disconnecting the front-panel assembly 3.

  • Page 89: Replacing The Amplifier Board

    Disassembly Replacing the Amplifier Board If you need to replace the amplifier board, you must detach the rear- and front- panel assemblies of the amplifier from the chassis. 1. Wear an antistatic wriststrap when handling the circuit assemblies. 2. Remove the 2 Phillips screws that attach the AC power connector to the rear panel.

  • Page 90: Figure 25: Removing The Amplifier Board

    Disassembly 8. Remove the screw that attaches the probe input connector to the front panel amplifier board to the chassis. Pull the front panel assembly away from the amplifier and set it aside as shown. 9. Remove the three screws that attach the amplifier board to the chassis. 10.

  • Page 91: Replacing The Power Supply

    Disassembly Replacing the Power Supply To replace the power supply, do the following: 1. Disconnect the AC and DC power connectors from the power supply. 2. Remove the four screws from the power supply. 3. Remove the power supply from the chassis. 4.

  • Page 92: Replacing The Fan

    Disassembly Replacing the Fan If you need to replace the fan, you must first detach the rear panel of the amplifier from the chassis to gain access to the fan: 1. Remove the 2 Phillips screws that attach the AC power connector to the rear panel as shown.

  • Page 93: Figure 28: Removing The Fan

    Disassembly 2. Disconnect the DC power supply connector from J2 on the amplifier board as shown. (See Figure 28.) 3. Disconnect the fan connector from J3 on the amplifier board. 4. Gently pull back the rear panel enough to allow access to the four nuts that secure the fan to the rear panel.

  • Page 94: Probes

    The probes that mate with the TCPA300 and TCPA400 Current Probe Amplifiers have two physical styles. The TCP305 and TCP312 use a slender form factor that contain three replaceable assemblies — the connector/cable, the circuit board, and the current transformer.

  • Page 95: Tcp305 And Tcp312

    Disassembly TCP305 and TCP312 Disassemble the TCP305 or TCP312 probe body as follows: 1. Remove the two screws from the bottom of the probe and pull the strain relief boot back as shown. Note: When reassembling the probe, insert and tighten the two screws.

  • Page 96: Figure 30: Removing The Top Half Of The Probe

    Disassembly Figure 30: Removing the top half of the probe Figure 31: Removing the probe slide TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual...

  • Page 97: Figure 32: Removing The Current Transformer

    4. Probe reassembly is the reverse of steps 1 through 2 of this procedure and steps 1 through 5. (See page 73, TCP305 and TCP312.) NOTE. Exercise care when fitting the slide back into the probe body; aligning the switch contacts can require patience.

  • Page 98: Figure 33: Removing The Circuit Board And Cable Assembly

    8. Probe reassembly is the reverse of steps 1 through 6 of this procedure and steps 1 through 5. (See page 73, TCP305 and TCP312.) CAUTION. To avoid damaging the wires inside the probe, carefully dress the wires in the lower body half to avoid contact with the slide assembly.

  • Page 99: Tcp303 And Tcp404Xl

    Disassembly TCP303 and TCP404XL The following procedures explain how to disassemble the probe body and replace the current transformer, the circuit board, and the cable assembly. WARNING. Probe disassembly must be performed by qualified service personnel to avoid personal injury or loss of life. 1.

  • Page 100: Figure 35: Removing The Current Transformer

    Disassembly Removing the Current Remove the current transformer of the probe as follows: Transformer 8. To remove the current transformer, lift the assembly out of the probe as shown and unplug it from the circuit board. Figure 35: Removing the current transformer Removing the Circuit The circuit board and cable are replaceable separately on TCP303 probes (see note).

  • Page 101: Figure 36: Removing The Circuit Board And Cable

    Disassembly 10. To remove the cable, do step 9 and then unsolder the two switch wires. Figure 36: Removing the circuit board and cable Removing the Circuit The circuit board and cable are replaced as an assembly on TCP404XL probes. Board and Cable Assembly 11.

  • Page 102: Isolating Hardware Faults

    Isolating Hardware Faults Isolating Hardware Faults Use the following procedures to help locate a hardware malfunction. You can isolate the symptoms to the amplifier or probe by substituting a known good probe or amplifier. If you suspect that you have a defective probe and you don’t have another compatible probe, you can use the calibration adapter in place of the probe to verify some of the amplifier functions.

  • Page 103: Determining The Amplifier Firmware Version Number

    Isolating Hardware Faults Determining the Amplifier Firmware Version Number If you are having a problem with your amplifier, it may be helpful to know the version of firmware that is in the amplifier. The firmware version may help the Technical Support Center to isolate the amplifier symptoms to a specific cause. To determine the amplifier firmware version number, do the following: 1.
  • Page 104 Isolating Hardware Faults TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual...

  • Page 105: Replaceable Parts

    TCPA300 and TCPA400. As described below, use these lists to identify and order replacement parts. Parts Ordering Information Replacement parts are available from or through your local Tektronix, Inc., service center or representative. Changes to Tektronix instruments are sometimes made to accommodate improved components as they become available and to give you the benefit of the latest...

  • Page 106: Amplifier Replaceable Parts

    Amplifier Replaceable Parts Amplifier Replaceable Parts Figure 38: TCPA300 and TCPA400 replaceable parts TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual...

  • Page 107: Table 38: Tcpa300 And Tcpa400 Replaceable Parts List

    Amplifier Replaceable Parts Table 38: TCPA300 and TCPA400 replaceable parts list Fig. & Tektronix index part Serial no. Serial no. number number effective discont’d Name & description 38-1 174-4676-XX CABLE ASSEMBLY,DC, POWER SUPPLY 210-0457-XX NUT,PL,ASSEM WA:6-32 X 0.312,STL CD PL,W/LOCKWASHER 119-6721-XX FAN,TUBEAXIAL:12VDC,0.10A,1.2W,14CFM,5600RPM,32DBA,50MM X 50MM...

  • Page 108: Table 39: Power Cord Identification

    Amplifier Replaceable Parts Table 39: Power cord identification Plug configuration Normal usage Option number/ North America 120 V Standard 161-0066-00 Universal Euro A1 161-0066-09 United Kingdom A2 161-0066-10 Australia A3 161-0066-11 Switzerland A5 161-0154-00 Japan A6 161-A005-00 China AC 161-0306-00 No power cord supplied.

  • Page 109: Figure 39: Tcpa300 And Tcpa400 Standard Accessories

    Amplifier Replaceable Parts Figure 39: TCPA300 and TCPA400 standard accessories Table 40: TCPA300 and TCPA400 standard accessories parts list Fig. & Tektronix index part Serial no. Serial no. number number effective discont’d Name & description 39-1 011-0049-XX TERMINATOR,BNC:COAXIAL,50 OHMS,2W,BNC 012-0117-XX CABLE ASSY:COAX,RFD,50 OHM,30.0L,MALE,BNC X MALE,BNC...

  • Page 110: Figure 40: Tcpa300 And Tcpa400 Optional Accessories

    Amplifier Replaceable Parts Figure 40: TCPA300 and TCPA400 optional accessories Table 41: TCPA300 and TCPA400 optional accessory parts list Fig. & Tektronix index part Serial no. Serial no. number number effective discont’d Name & description 40-1 174-4765-XX CABLE ASSY, CALIBRATION ADAPTER...

  • Page 111: Current Probes Replaceable Parts

    Current Probes Replaceable Parts Current Probes Replaceable Parts Figure 41: TCP305 and TCP312 replaceable parts TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual...

  • Page 112: Table 42: Tcp305 And Tcp312 Replaceable Parts List

    Current Probes Replaceable Parts Table 42: TCP305 and TCP312 replaceable parts list Fig. & Tektronix Index Part Serial No. Serial No. Number Number Effective Discont’d Name & Description 41-1 204-0288-XX BODY HALF,PROBE:UPPER BODY HALF,BLACK,POLY 214-0835-XX SPRING,HLCPS:0.127 OD X 2.65 L,SST...

  • Page 113: Figure 42: Tcp303 Replaceable Parts

    Current Probes Replaceable Parts Figure 42: TCP303 replaceable parts TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual...

  • Page 114: Table 43: Tcp303 Replaceable Parts List

    Current Probes Replaceable Parts Table 43: TCP303 replaceable parts list Fig. & Serial Serial Index Tektronix Number Number Number Part Number Effective Discont’d Name & Description 42-1 204-0713-XX BODY HALF,PROBE:LEFT W/CONTACTS 351-0955-XX SLIDE ASSEMBLY:WITH WARNING LABEL 335-0912-XX MARKER,IDENT:PROBE ID LABEL,TCP303...

  • Page 115: Figure 43: Tcp404Xl Replaceable Parts

    Current Probes Replaceable Parts Figure 43: TCP404XL replaceable parts TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual...

  • Page 116: Table 44: Tcp404Xl Replaceable Parts List

    Current Probes Replaceable Parts Table 44: TCP404XL replaceable parts list Fig. & Tektronix Index Part Serial No. Serial No. Number Number Effective Discont’d Name & Description 43-1 204-0713-XX BODY HALF,PROBE:LEFT W/CONTACTS 351-0955-XX SLIDE ASSEMBLY:WITH WARNING LABEL 335-0913-XX MARKER,IDENT:PROBE ID LABEL,TCP404XL...
  • Page 117 Glossary amp-second product The unit of measure defining the maximum amount of pulsed current that can be measured before the probe core becomes saturated. The amp-second rating applies only to measurement values between the maximum continuous and maximum pulse current ratings of the probe. The amp-second rating is equal to the peak current multiplied by the pulse width at the 50% point.
  • Page 118 Glossary Hall device A thin, rectangular piece of semiconductor material located in the core of the current probe. The Hall device uses the Hall effect for DC and low-frequency AC measurements. Hall effect The effect that produces a voltage potential in the Hall device when magnetic lines of force pass through the device.
  • Page 119 Adjustments Fan, 70 overview, 45 Front Panel Assembly, 66 TCP303 & TCP404XL, 52 Instrument Case & Internal TCP305 & TCP312, 49 insertion impedance, 96 Covers, 63 TCPA300 & TCPA400, 46 Power Supply, 69 amp-second product, 95 Probe Circuit Board or Cable...
  • Page 120 Index Test Record Performance Verification:TCP303, 42 Performance Verification:TCP305, 29 Performance Verification:TCP312, 30 Performance Verification:TCP404XL, 43 Performance Verification:TCPA300, 17 Performance Verification:TCPA400, 18 TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual...

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