Tektronix P7330 Service Manual
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Tektronix P7330 Service Manual

Tektronix P7330 Service Manual

3.5 ghz differential probe
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Enlarged version
Service Manual
P7330 3.5 GHz
Differential Probe
071-1057-00
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
P071105700
071105700

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Summary of Contents for Tektronix P7330

  • Page 1 Service Manual P7330 3.5 GHz Differential Probe 071-1057-00 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.
  • Page 2 Commercial Computer Software – Restricted Rights clause at FAR 52.227-19, as applicable. Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes that in all previously published material. Specifications and price change privileges reserved.

  • Page 3: General Safety Summary

    Do Not Operate in an Explosive Atmosphere. Keep Product Surfaces Clean and Dry. Provide Proper Ventilation. Refer to the manual’s installation instructions for details on installing the product so it has proper ventilation. P7330 3.5 GHz Differential Probe Service Manual...
  • Page 4 Symbols on the Product. The following symbols may appear on the product: CAUTION WARNING Double Protective Ground Not suitable for Insulated Refer to Manual High Voltage (Earth) Terminal connection to the public telecom- munications network P7330 3.5 GHz Differential Probe Service Manual...

  • Page 5: Manual Structure

    Preface This is the service manual for the P7330 3.5 GHz Differential Probe. Read this preface to learn how this manual is structured and where you can find other information related to servicing this product. Manual Structure This manual contains three sections – Description, Performance Verification, and Adjustment Procedures, and is intended to be used by qualified service personnel.

  • Page 6: Contacting Tektronix

    This phone number is toll free in North America. After office hours, please leave a voice mail message. Outside North America, contact a Tektronix sales office or distributor; see the Tektronix web site for a list of offices. P7330 3.5 GHz Differential Probe Service Manual...
  • Page 7 Description This document describes the Performance Verification and Adjustment Proce- dures for the P7330 Probe. There are no user-replaceable parts inside the probe. If the probe fails the performance verification procedure, and adjusting the probe cannot compensate for the failure, contact your Tektronix service center.

  • Page 8: Equipment Required

    SMA adapter wrench 7/32-in Required for adjustment procedures only Special Adapters Required Some of the adapters listed in Table 1 are custom-made and available only from Tektronix. The adapters are described on the following pages. P7330 3.5 GHz Differential Probe Service Manual...
  • Page 9 Description TekConnect-to-SMA The TekConnect-to-SMA Adapter, Tektronix part number TCA-SMA, allows Adapter signals from an SMA cable or probe to be connected to a TekConnect input. See Figure 1. Connect and disconnect the adapter the same way as you do the P7330 Probe.
  • Page 10 Measure the offset voltage using a DVM, BNC coaxial cable, and BNC-to-dual-banana jack. Offset voltage output Signal out. The SMA connector on the rear of the box allows for direct monitoring of the probe signal. Signal P7330 3.5 GHz Differential Probe Service Manual...
  • Page 11 SMA connectors allow stimulus signals to connect to the fixture and are located on the front and back of the fixture. The fixture is designed to be used with a probe positioner, such as a Tektronix PPM203B.
  • Page 12 6. Verify that contact is made on both pins. (You may need to readjust the fine position and/or pressure adjustment to make positive contact with the test points.) 7. Proceed with the instructions according to your specific test . P7330 3.5 GHz Differential Probe Service Manual...

  • Page 13: Theory Of Operation

    Figure 5: P7330 simplified schematic diagram The offset signal from the oscilloscope extends the dynamic range of the P7330 probe by compensating for some of the DC voltage that may be part of the signal applied to the probe.
  • Page 14 The DC CMRR adjustment is used to optimize the common-mode rejection performance of the probe tip amplifier to DC signals. The AC CMRR perfor- mance of the P7330 probe is not adjustable, but is set by the probe tip amplifier design and manufacturing process.

  • Page 15: Performance Verification

    16 and photocopy the test record, and use it to record the performance test results. The recommended calibration interval is one year. No software is required to do a performance verification of the P7330 probe. These procedures test the following specifications: Output offset voltage...

  • Page 16: Output Offset Voltage

    2. Set the voltage on each power supply to approximately +0.25 V, to set a source voltage of about +0.5 V (+0.5 V differential mode, 0 V common mode). Record this source voltage as V P7330 3.5 GHz Differential Probe Service Manual...
  • Page 17 Example: 0.1007–(–0.1012) 0.2017–0.2 gain %error 100% 0.498–(–0.503) 0.2019 0.0017 100% 1.001 0.2017 0.85% 7. Verify that the gain is 0.2, 8. Record the calculated gain on the test record. P7330 3.5 GHz Differential Probe Service Manual...
  • Page 18 Figure 8: Test system rise time setup 2. Set the oscilloscope trigger to internal clock. 3. Select the channel you have connected to on the 80E0X sampling head, and then set the oscilloscope vertical scale to 50 mV/div. P7330 3.5 GHz Differential Probe Service Manual...
  • Page 19 11. Secure the probe head in the probe positioner. The test setup should now be connected as shown in Figure 9 on page 14. P7330 3.5 GHz Differential Probe Service Manual...
  • Page 20 14. Using the probe positioner, probe the DM test points on the probe calibration fixture. Compare your display to Figure 10 on page 15 to verify that you have a valid connection with both pins. P7330 3.5 GHz Differential Probe Service Manual...
  • Page 21 10% and 90% amplitude points on the waveform. Record the rise time as t s+p. 18. Calculate the probe rise time using the following formula: 19. Record the calculated probe rise time on the test record. P7330 3.5 GHz Differential Probe Service Manual...
  • Page 22 Incom- Outgo- Maxi- Performance test – 10 mV ________ ________ + 10 mV Output offset voltage DC gain accuracy – 2 % ________ ________ + 2 % Rise time ________ ________ 140 ps P7330 3.5 GHz Differential Probe Service Manual...

  • Page 23: Adjustment Procedures

    These instructions are for personnel who are familiar with servicing the product. If you need further details for disassembling or reassembling the product, refer to the appropriate product manual. Contact your nearest Tektronix, Inc., Service Center or Tektronix Factory Service for installation assistance.

  • Page 24: Application Setup

    Select Adjustment in the Task to Perform list. 2. Click Continue. 3. The P7330 Probe Adjustments Dialog Box appears. See Figure 13 on page 20. NOTE. An error message appears if one of the following conditions exists: A probe is not connected to the adapter.

  • Page 25: Offset Zero

    BNC-SMA adapter Figure 12: Setup for offset zero 2. Set the offset switch on the calibration adapter to GND. 3. Click Offset Zero in the application window. See Figure 13 on page 20. P7330 3.5 GHz Differential Probe Service Manual...
  • Page 26 Click Store Setting after voltage is set Figure 13: Offset Zero Control in the P7330 Adjustments window 4. Set the offset zero voltage on the DMM to 0.000 V by adjusting the Offset Zero Control. The index value in the Offset Zero Control varies from 0 to 3969, and corresponds to approximately 20 mV of offset voltage range.
  • Page 27 Offset Zero and DC CMRR adjustments, it may be necessary to repeat the procedure to optimize the adjustments. 1. Click DC Gain Match in the application window. See Figure 14. Figure 14: DC Gain Match window P7330 3.5 GHz Differential Probe Service Manual...
  • Page 28 0.0000 V, 0.0001 V. Click Store Setting to save the offset gain level. 7. Record the output voltage as V 8. Set the input voltage on the DC source to approximately –3.0 V. Record the actual voltage as V P7330 3.5 GHz Differential Probe Service Manual...
  • Page 29 8. This is a temporary value until Accept is selected later, after all adjust- ments have been made. 13. Click Store Setting to store the gain level you set in step 6. 14. Proceed to the Offset Gain procedure. P7330 3.5 GHz Differential Probe Service Manual...

  • Page 30: Offset Gain

    Each click adjusts the offset control voltage by about 1.0 mV. To increment by ten clicks or about 10 mV, click in the bar to the left and right of the slider. P7330 3.5 GHz Differential Probe Service Manual...
  • Page 31 Setting to update the AFTER field with the new offset gain level. In the Summary Info box, the AFTER field updates with the control value from step 8. This is a temporary value until Accept is selected. P7330 3.5 GHz Differential Probe Service Manual...

  • Page 32: Verify Operation

    10. Click Yes to update the contents. This completes the adjustments to the probe. Verify Operation Do the performance verification procedures for the offset zero and DC attenua- tion specifications. End of document P7330 3.5 GHz Differential Probe Service Manual...

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