Teledyne Lecroy AP033 Operator's Manual
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Teledyne Lecroy AP033 Operator's Manual

Active differential probe
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Operator's
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AP033 Active
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  • Page 1 Operator’s Manual AP033 Active Differential Probe 1.800.561.8187 information@itm.com www. .com...
  • Page 2 AP033 Active Differential Probe Operator’s Manual February 2017 1.800.561.8187 information@itm.com www. .com...
  • Page 3 Teledyne LeCroy documentation for their own internal training purposes. Teledyne LeCroy is a registered trademark of Teledyne LeCroy, Inc. Windows is a registered trademark of Microsoft Corporation. Other product or brand names are trademarks or requested trademarks of their respective holders. Information in this publication supersedes all earlier versions.

  • Page 4: Table Of Contents

    Probe Input Loading....................10 Grounding the Probe ....................10 Selecting the Proper Range..................11 Operating with Teledyne LeCroy Oscilloscopes ............13 Designing Test Fixtures for the AP033 Probe ............16 Maintenance ....................... 17 Cleaning ........................17 Calibration Interval ....................17 Service Strategy ......................
  • Page 5 Notes .......................... 52 Figures Figure 1, Typical CMRR Graphs ...................7 Figure 2, channel setup dialog with AP033 probe dialog behind it........8 Figure 3, AP033 Equivalent Input Model ................10 Figure 4, AP033 Block Diagram ..................11 Figure 5, AP033 probe dialog with probe controls and attributes........13 Figure 6, Effect of Differential Offset ................15...

  • Page 6: Safety Instructions

    Operator’s Manual Safety Instructions This section contains instructions that must be observed to keep this oscilloscope accessory operating in a correct and safe condition. You are required to follow generally accepted safety procedures in addition to the precautions specified in this section. The overall safety of any system incorporating this accessory is the responsibility of the assembler of the system.
  • Page 7 AP033 Active Differential Probe Use only within operational environment listed. Do not use in wet or explosive atmospheres. Keep product surfaces clean and dry. Use indoors only. Handle with care. Probe accessory tips are sharp. They can puncture skin or cause other bodily injury if not handled properly.

  • Page 8: Overview

    Overview Description The AP033 is a wide band differential active probe. The probe features low noise, low input capacitance, high common mode rejection, and FET-buffered inputs in the probe head. User selectable attenuation and offset give the probe flexibility to measure a large range of signal amplitudes.

  • Page 9: Optional Accessories

    ADPPS Power Supply Adapter for Non-ProBus Oscilloscopes Oscilloscope Software Compatibility Teledyne LeCroy LC series oscilloscopes must have legacy software version 8.1.0 or higher loaded. All X-Stream oscilloscopes are compatible. To verify the software version installed on the oscilloscope, either: •...

  • Page 10: Specifications

    Output impedance 50 Ω, intended to drive 50 Ω. Add uncertainty of termination impedance to accuracy. Teledyne LeCroy measures CMRR with a fixture that connects the probe tip ground to the signal source ground. This method is necessary to obtain a reproducible CMRR measurement. Not grounding the probe...
  • Page 11 AP033 Active Differential Probe Typical Electrical Characteristics Typical characteristics are parameters with no guaranteed performance. Tests for typical characteristics are not provided in the Performance Verification Procedure. Bandwidth, probe only: (-3 dB): DC to 500 MHz Risetime, probe only: ≤ 700 ps (÷10 Attenuation) ≤...

  • Page 12: Figure 1, Typical Cmrr Graphs

    Operator’s Manual Figure 1, Typical CMRR Graphs General Characteristics Temperature: 0° to 50° C Operating -40° to 75° C Storage Input Connectors: Compatible with 0.025” (0.635 mm) square pins 0.036” (0.91 mm) maximum diameter (for round pins) Power Requirements: Powered from oscilloscope through ProBus interface or with ADPPS power supply.

  • Page 13: Operation

    ADPPS can be interconnected with a 50 Ω coaxial cable. To minimize the effect of skin loss, this cable should be 1 m or less in length. The AP033 is designed to drive a 50 Ω load. The gain will be uncalibrated if the output is not correctly terminated. If you are using the probe with an instrument with a high input impedance, place a 50 instrument input before attaching the ADPPS..
  • Page 14 Operator’s Manual To maintain the high performance capability of the probe, user care in connecting the probe to the test circuit. Increasing the parasitic capacitance or inductance in the input paths may introduce a “ring,” or slow the rise time of fast signals. To minimize these effects, use the shortest length possible when connecting the probe to the circuit under test.

  • Page 15: Probe Input Loading

    Attaching any probe to a test circuit will add some loading. In most applications, the high impedance of the AP033 Active Differential Probe inputs imparts an insignificant load to the test circuit. However at very high frequencies, the capacitive reactance of the probe’s input capacitance may load the circuit enough to affect measurement accuracy.

  • Page 16: Selecting The Proper Range

    Selecting the Proper Range The AP033 has two independent controls that set the common mode range and equivalent volts/division. The probe gain can be set to x1 or x10. The gain control (GAIN) only affects the differential mode range of the probe. A separate input attenuation control (ATTEN) sets the probe input attenuator to either ÷1 or ÷10.

  • Page 17: Table 1, Dynamic Ranges And Input Capacitance At Different Attenuator Settings

    Because the common mode signal is rejected by the probe, and not displayed, changes in the amplitude of the common mode component are not apparent. Exceeding the common mode range may introduce distortion into the AP033 output. To reduce the possibility of errors caused by exceeding the common mode range, the probe monitors the input voltage.

  • Page 18: Operating With Teledyne Lecroy Oscilloscopes

    2 mV/div to 10 V/div (with external ÷10 attenuator installed). Some of the transitions in scale factor will result in a change of the attenuation in the AP033 probe. The common mode range, input capacitance, and noise level of the probe will change with the probe attenuator setting.

  • Page 19: Table 2, Recommended Settings To Obtain Desired Equivalent Volts/Division

    AP033 Active Differential Probe limited to the scale factors that can be obtained without changing the AP033 gain or attenuation. Thus in Manual gain control mode, only the scale factor of the oscilloscope will be changed. In this mode, dedicated touch screen controls are displayed for Probe Attenuation and Probe gain (see Figure 5).

  • Page 20: Figure 6, Effect Of Differential Offset

    Operator’s Manual Adding Offset The AP033 has true differential offset capability. This allows you to remove a DC bias voltage from the differential input signal while maintaining DC coupling. By using probe offset rather than offset at the oscilloscope inut, the full dynamic range of the probe remains centered around the offset level.

  • Page 21: Designing Test Fixtures For The Ap033 Probe

    Often it is desirable to connect the probe directly to user fabricated test fixtures, such as those used for semiconductor characterization. To facilitate use with custom test fixtures, the input receptacles of the AP033 probe are compatible with commercially available 0.025 in. (0.635 mm) square pins. The receptacles do not require a specific rotational alignment for the square pin.

  • Page 22: Maintenance

    Service Strategy The AP033 circuits utilize fine pitch surface mount devices; it is, therefore, impractical to attempt component-level repair in the field. Defective probes must be returned to a Teledyne LeCroy service facility for diagnosis and exchange. A defective probe under warranty will be replaced with a factory refurbished probe.

  • Page 23: Troubleshooting

    7. Is a ProBus Power Supply Overload error message displayed? If so, remove all other ProBus accessories from the oscilloscope. Is the message still displayed? If so, remove the AP033. Is the message still displayed? If so, the oscilloscope should be returned for service.
  • Page 24 Operator’s Manual B. Incorrect Frequency Response Possible causes are a defective probe or oscilloscope, poor connections, or poor grounding. 1. Verify that the BW limiting of the oscilloscope is off. 2. Connect the probe to another oscilloscope. If the probe now measures properly, the problem may be in the oscilloscope.

  • Page 25: Returning A Probe

    AP033 Active Differential Probe Returning a Probe Contact your local Teledyne LeCroy service center for calibration or other service. If the product cannot be serviced on location, the service center will give you a Return Material Authorization (RMA) code and instruct you where to ship the product. All products returned to the factory must have an RMA.

  • Page 26: Matching Procedure For ÷10 Plugs

     NOTE: The AP033 has different input capacitance. The 10 Plug-on attenuator supplied with model AP033 cannot be properly adjusted for use with model AP033. Make sure that the attenuator is marked “AP033” before attempting this procedure. Equipment Required Test Oscilloscope The oscilloscope must support ProBus.

  • Page 27: Procedure

    AP033 Active Differential Probe Procedure 1. Attach the AP033 to the test oscilloscope. If the test oscilloscope is not equipped with ProBus, use the ADPPS to provide power for the AP033. 2. Attach the ÷10 Attenuator Adapter to the AP033 probe tip.

  • Page 28: Figure 8, ÷10 Attenuator Adjustment Locations

    13. Set the signal generator frequency to about 50 Hz, and the output amplitude to about 10 V. 14. Set the test oscilloscope Volts/Div to 20 mV (for Teledyne LeCroy oscilloscopes with ProBus) or 2 mV/Div when using the ADPPS with an oscilloscope without scale factor correction;...

  • Page 29: Performance Verification

    AP033 Active Differential Probe Performance Verification This procedure can be used to verify the warranted characteristics of the AP033 Active Differential Probe. You can do the performance verification without removing the instrument covers and exposing yourself to hazardous voltages. Adjustment should only be attempted if a parameter measured in the Performance Verification Procedure is outside of the specified limits.

  • Page 30: Preliminary Procedure

    Extension Cable. Connect the male end of the ProBus extension cable to Channel 1 of the oscilloscope. 2. Turn the oscilloscope on and allow at least a 30-minutes warm-up time for the AP033 and test equipment before performing the Verification Procedure.

  • Page 31: Test Procedure

    A. Check Gain Accuracy 1. From the oscilloscope front panel, select Channel 1. Set the AP033 gain control to Manual, the Probe gain to X1, and the Probe Attenuation to /1. (/1 is the same as ÷1)
  • Page 32 Operator’s Manual 15. Record the answer to two significant places (±x.xx%) on line A-15 in the Test Record. 16. Verify that the X1 gain error is less than ±2%. 17. Change the probe Attenuation to /10 and the probe Gain to X10. 18.
  • Page 33 3. Set the oscilloscope to display Channel 1. Set Coupling to DC 1 MΩ, and Global BWL to Off. AP033 gain control to Manual, Probe Atten to /1 and Probe Gain to /1. AutoZero the AP033. Set the oscilloscope trigger mode to AUTO.
  • Page 34 Common Mode Drive 50 Ohm Termination input connector of the AP033 Calibration Fixture. 18. Set the oscilloscope to display Math channel A (Averaged AP033 Output), and trigger source to Channel 1. 19. Increase the Channel 1 vertical sensitivity as needed to view the signal.
  • Page 35 20 MHz on X-Stream oscilloscopes). 3. Set the AP033 Coupling to DC 1MΩ, Attenuation to /1, and Gain to X1. 4. Attach a BNC cable from the output of the Function Generator to the BNC T adapter.
  • Page 36 18. Remove all cables and test fixtures from the AP033 probe. This concludes the Performance Verification of the AP033. Complete and file the results recorded in the AP033 Performance Verification Test Record as required by your quality procedures. Apply a suitable calibration label to the AP033 housing as required.

  • Page 37: Ap033 Performance Verification Test Record

    AP033 Active Differential Probe AP033 Performance Verification Test Record Permission is granted to copy and use the following pages to record the AP033 Performance Verification results. File the completed record as required by applicable internal quality procedures. The section in the test record corresponds to the parameters tested in the performance verification procedure.
  • Page 38 Operator’s Manual AP033 Performance Verification Test Record, Page 2 Serial #:______________________________ Date: _______________ Step Description Intermediate Data Test Result Gain Accuracy Sine Wave Generator Output Voltage ___________ mV A-13 Probe Output Voltage ___________ mV A-15 __________ % X1 Gain Error (Test limit ≤ ±2%)

  • Page 39: Adjustment Procedure

    AP033 Active Differential Probe Adjustment Procedure Introduction You can use this procedure to adjust the AP033 Active Differential Probe to meet the warranted specifications. This procedure should only be performed if the instrument fails the Performance Verification tests. If the probe cannot be adjusted to meet the Performance Verification limits, repair may be necessary.

  • Page 40: Test Equipment Required

    Table 4, Adjustment Test Equipment Description Minimum Requirements Example Test Equipment Wide Band Oscilloscope 500 MHz bandwidth Teledyne LeCroy LT342 (see note) 2 mV to 200 mV vertical scale Teledyne LeCroy LC344A factors ProBus interface equipped* 2% vertical accuracy Digital Multimeter 0.1% DC volts accuracy at 0.4...
  • Page 41 Johanson 4192 Low Capacitance Screwdriver NOTE: If a Teledyne LeCroy ProBus equipped oscilloscope is not available, you may perform the adjustment procedure with an alternate oscilloscope that meets the other Minimum Specifications, and the model ADPPS power supply. The input termination of...

  • Page 42: Preliminary Procedure

    4. Connect the AP033 probe output to the female end of the ProBus Extension Cable. Be careful to align the ProBus pins with the corresponding connector correctly.

  • Page 43: Procedure

    Procedure NOTE: This procedure must be performed with the probe set to Manual gain control. See Operating with Teledyne LeCroy Oscilloscopes on page 13 for more information about controlling probe settings in different software versions. A. Adjust Preliminary Probe DC Balance (R36) 1.

  • Page 44: Figure 10, Probe Tip Adjustment Locations

    Operator’s Manual Figure 10, Probe Tip Adjustment Locations B. Adjust Coarse DC Balance (R226) 1. Remove the shorting plug from the Logic Board. 2. Change the Channel 1 probe Gain to X1. 3. Reinsert the shorting plug into the two holes near the end of the Logic Board. 4.

  • Page 45: Figure 12, ÷10 Effective Gain Indicator

    DMM. 6. Short the output BNC connector by reconnecting the cable to the SHORT connector on the AP033 Calibration Fixture. The SHORT connector is the only BNC connector on the AP033 Calibration Fixture that does not have corresponding input pins for the probe tip. It is located on the end of the board beyond the Common Mode Terminated connector.
  • Page 46 Termination portion of the AP033 Calibration Fixture with the input receptacles in the AP033 probe head. Press the probe into the fixture to fully engage the pins. 11. Set the oscilloscope to display Channel 3. The waveform is the common mode signal.
  • Page 47 E. Adjust OFFSET (R330) 1. Set AP033 probe Attenuation to /1 and Gain to X1. Set the Channel 1 scale factor to 2 mV/div, and the acquisition mode to Auto. Set the BWL to 20 or 25 MHz . Adjust the OFFSET to 0.0 mV.
  • Page 48 AP033 for the next step. F. Adjust GAIN (R322C) 1. Set the AP033 offset to 0.000 V. Make sure the probe is still set to /1 Attenuation and X1 Gain. 2. Disconnect the BNC cable from the oscilloscope end of the ProBus extender cable.
  • Page 49 4. Connect a BNC cable from the CAL output BNC connector to the Differential Drive 50 Ohm Termination connector on the AP033 Calibration Fixture. 5. Carefully attach the Differential Drive 50 Ohm Termination portion of the AP033 Calibration Fixture to the probe tip. Press the probe into the fixture to fully engage the pins.
  • Page 50 Ohm Termination portion. 2. Remove the BNC cable from the Differential Drive 50 Ohm Termination connector of the AP033 Calibration Fixture. Connect one end of the BNC cable to the Common Mode Drive 50 Ohm Termination connector of the AP033 Calibration fixture.

  • Page 51: Reference Information

    2. Perform the Attenuator Matching Procedure listed on page 21. Apply calibration seals in accordance with your quality procedures. This concludes the Adjustment Procedure. Repeat the Performance Verification procedure to complete the calibration of the AP033. Reference Information Differential Mode and Common Mode Differential probes amplify the voltage difference that appears between the + and –...

  • Page 52: Common Mode Rejection Ratio

    Operator’s Manual Figure 13, Common Mode and Differential Mode Range Common Mode Rejection Ratio The ideal differential probe or differential amplifier would amplify only the differential mode voltage component and reject all of the common mode voltage component. Real differential probes and amplifiers are less than ideal, so a small portion of the common mode voltage component appears in the output.

  • Page 53: Certifications

    AP033 Active Differential Probe Certifications Teledyne LeCroy certifies compliance to the following standards as of the date of publication. For the current certifications, please see the EC Declaration of Conformity shipped with your product. EMC Compliance EC D - EMC...
  • Page 54 The probe is subject to disposal and recycling regulations that vary by country and region. Many countries prohibit the disposal of waste electronic equipment in standard waste receptacles. For more information about proper disposal and recycling of your Teledyne LeCroy product ESTRICTION OF AZARDOUS UBSTANCES The product and its accessories conform to the 2011/65/EU RoHS2 Directive.

  • Page 55: Warranty

    Spare parts, replacement parts and repairs are warranted for 90 days. In exercising its warranty, Teledyne LeCroy, at its option, will either repair or replace any assembly returned within its warranty period to the Customer Service Department or an authorized service center.

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