Agilent Technologies N1021B User Manual
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Agilent Technologies N1021B User Manual

Agilent Technologies N1021B User Manual

Differential tdr probe
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Agilent N1021B
Differential TDR Probe
User's Guide

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Summary of Contents for Agilent Technologies N1021B

  • Page 1 Agilent N1021B Differential TDR Probe User’s Guide...

  • Page 3: Table Of Contents

    N1021B User’s Guide Agilent N1021B—At a Glance 2 Proper Handling Techniques 5 Adjusting the Probe Tip Separation 7 Attaching to a Positioner 8 Calibrating the Probe 9 Performing an Operation Verification 11 Probing a Differential Trace’s Length Midpoint 15 Probe Characteristics 16...

  • Page 4: Agilent N1021B-At A Glance

    RF connectors are unavailable. It is ideal for use with the Agilent 54754A TDR plug-in module. Although the N1021B probe was designed for TDR applications, it is also suitable as a high bandwidth, passive probe for non-TDR applications.
  • Page 5 Using the Probe ■ Refer to “Proper Handling Techniques” on page 5 before using the probe for the first time. ■ Refer to “Calibrating the Probe” on page 9 to cali- brate the test setup for use with the probe. Electrostatic discharge (ESD) can damage or destroy C A U T I O N electronic components and the input circuits on plug-...
  • Page 6 To order the parts listed in the table, search for “Parts” at www.agilent.com/Find/Parts. There are no replaceable parts on the probe. Table 1. Items Supplied With N1021B Item Part Number Pair of phase-matched cables...

  • Page 7: Proper Handling Techniques

    Proper Handling Techniques Use the following techniques to avoid damaging the probe. The probe tips are not replaceable. ■ Hold the probe perpendicular to the device under ° test. Probing angles greater than 15 from perpen- dicular will likely damage the tips over time. ■...
  • Page 8 5 in-lb (0.56 Nm) torque wrench. ■ Before cleaning the external case parts of the N1021B, disconnect the probe from all cables. Use a dry cloth or one slightly dampened with a mild soap and water solution. Do not attempt to clean internally.

  • Page 9: Adjusting The Probe Tip Separation

    Adjusting the Probe Tip Separation Turn the probe spacing adjustment wheel to change the spacing between the probe tips. Avoid using excessive force at the limits of the adjustment range.

  • Page 10: Attaching To A Positioner

    M2.5 socket-head screws (6 mm long) and an Allen wrench are provided to attach the adapter to the N1021B. The two screw holes on the probe are sepa- rated by ¼-inch (6.4 mm) on center. Torque each screw to 5 in-lb (0.56 Nm). A ¼-inch hole in the adapter is used to attach the adapter to the posi- tioner.

  • Page 11: Calibrating The Probe

    ■ De-skew the two test-setup cable paths ■ TDR measurement setup ■ TDR calibration. Use the N1021B kit’s phase-matched cables for the test N O T E setup cables referred to in the procedure. Do not connect these cables during the module calibration. The cables must be connected for the remaining steps in the procedure.
  • Page 12 4 Connect the probe to the cables and use the horizontal controls to position the portion of the response that corresponds to the end of the probe at the left side of the display. 5 Connect the DUT (Device-Under-Test).

  • Page 13: Performing An Operation Verification

    Module depending on the position of the TDR module. Always use high quality terminations for best results. 5 Connect the N1021B kit’s phase-matched cables to the TDR module’s inputs. The cables must remain connected for the remainder of the procedure.
  • Page 14 Measurement Results. 9 Click De-skew. The Start and Stop waveform markers will probably be located on the incident (first) step response as shown here. 10 Increase the horizontal time span to view both incident and reflected step responses. The reflected response is from the end of the cables. 11 Position the reflected response near the display’s left edge, then decrease the horizontal span while keeping the reflected response displayed.
  • Page 15 14 Connect the N1021B probe at the end of the cables. Click Calibration Wizard. The reference plane is located at the point where the cables attach to the probe. When the TDR calibration instructs you to disconnect every- N O T E thing from the module, disconnect the cables at the probe.
  • Page 16 24 Using the following equation, calculate the BW of the probe. This simplified equation estimates one- way bandwidth, based on the measured fall time in seconds. This is a conservative estimate for bandwidth, because it includes neither the fall time of the calibrated 54754A module nor the cables.

  • Page 17: Probing A Differential Trace's Length Midpoint

    Probing a Differential Trace’s Length Midpoint What are the effects of probing a differential trace midway along the trace’s length? At the probe’s tip, the TDR pulse splits into two parts traveling in opposing directions away from the probe. To the probe, it appears that two impedances are connected in parallel.

  • Page 18: Probe Characteristics

    Probe Characteristics The following are nominal characteristics of the probe and do not describe warranted performance. However, performance which is deemed grossly dif- ferent than the listed characteristics will be covered by a 1 year warranty Table 2. Characteristics of TDR Probe Description Characteristic Bandwidth (pitch dependent)

  • Page 19: Returning The Probe For Service

    Returning the Probe for Service For technical assistance, contact your local Agilent Call Center. Please notify the service office before returning your probe for service. Any special arrangements for the probe can be discussed at this time. This will help the Agilent service office repair and return your instrument as quickly as possible.

  • Page 20: Safety Symbols

    Safety Symbols The caution sign denotes a hazard. It calls attention to C A U T I O N a procedure which, if not correctly performed or adhered to, could result in damage to or destruction of the product. Do not proceed beyond a caution sign until the indicated conditions are fully understood and met.
  • Page 21 The information contained in this document is subject to change without notice. Companies, names, and data used in examples herein are fictitious unless otherwise noted. Agilent Technologies makes no warranty of any kind with regard to this material, including but not limited to, the implied warran- ties of merchantability and fitness for a particular purpose.
  • Page 22 © Copyright Agilent Technologies 2009 All Rights Reserved. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under copyright laws. Agilent Technologies, Inc. Digital Test Division 1400 Fountaingrove Parkway Santa Rosa, CA 95403, USA Agilent Technologies Part No. N1021-90001...

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