Keysight 42941A Impedance Probe Kit Operation and Service Manual
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Notices The information contained in this document is subject to change without notice. This document contains proprietary information that is protected by copyright.All rights are reserved. No part of this document may be photocopied, reproduced, or translated to another language without the prior written consent of Keysight Technologies. Keysight Technologies Japan, Ltd.
• DO NOT Operate In An Explosive Atmosphere Do not operate the instrument in the presence of flammable gasses or fumes. Operation of any electrical instrument in such an environment constitutes a definite safety hazard. • Keep Away From Live Circuits Operating personnel must not remove instrument covers. Component replacement and internal adjustments must be made by qualified maintenance personnel. Do not replace components with the power cable connected.
Warranty This Keysight Technologies instrument product is warranted against defects in material and workmanship for a period corresponding to the individual warranty periods of its component products. Instruments are warranted for a period of one year. Fixtures and adapters are warranted for a period of 90 days. During the warranty period, Keysight Technologies will, at its option, either repair or replace products that prove to be defective.
Assistance Product maintenance agreements and other customer assistance agreements are available for Keysight Technologies products. For any assistance, contact your nearest Keysight Technologies Sales and Service Office. Addresses are provided at the back of this manual. Safety Symbol General definitions of safety symbols used on the instrument or in manuals are listed below.
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Contents 1. Installation Guide Incoming Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Connecting the 42941A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Serial Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.
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1 Installation Guide
Installation Guide Incoming Inspection Incoming Inspection Inspect the shipping container for damage. If the shipping container or cushioning material is damaged, it should be kept until the contents of the shipment have been checked for completeness and the 42941A has been checked mechanically and electrically. The shipment should contain everything listed in Table 1-1. If the contents are incomplete or if there is mechanical damage or defect, notify the nearest Keysight Technologies office.
Installation Guide Connecting the 42941A Connecting the 42941A Follow the steps below to connect the 42941A to the Impedance Analyzer. Step 1. Join the 42941A four-terminal pair connection block to the test connectors on the front panel of the Impedance Analyzer by gently matching the four BNC connectors and securing screws of the block with the test connectors and accessory mounting holes of the instrument until they come into complete contact. Step 2.
Installation Guide Serial Number Serial Number Keysight Technologies uses a two-part, ten-character serial number that is stamped on the serial number plate (Figure 1-2) attached to the bottom of the four-terminal pair connection block. The first four letters and one digit are the serial prefix and the last five digits are the suffix.
2 Overview
Overview Product Overview Product Overview The 42941A is the impedance probe kit designed for the Impedance Analyzer. When used with the Impedance Analyzer, this kit allows impedance measurement and analysis in a wide frequency range of up to 110 MHz. Its 1.5-meter cable for probing allows you to evaluate implemented circuits and mounted devices.
Overview Functions Functions Figure 2-2 and Figure 2-3 show the names of the 42941A’s parts and probe adapters, respectively. Figure 2-2 42941A Parts Table 2-1 42941A Function No. NAME FUNCTION 1 Four-terminal Pair Connection Block Connects the 42941A to the Impedance Analyzer 2 Securing Screws Secures the 42941A to the Impedance Analyzer. 3 Probe Attaches to various probe adapters for measurement.
Overview Functions Figure 2-3 Probe Adapters Table 2-2 Probe Adapters No. NAME FUNCTION 4 3.5-mm Short A short device used for the adapter setup. 5 3.5-mm Load A load device (50 Ω) used for the adapter setup. 6 Pin Probe Attached to the probe to measure implemented circuits, mounted devices, and printed circuit patterns. 7 Ground Lead Attached to the pin probe to connect to the GND of the DUT. 8 BNC Adapter Attached to the probe to measure devices and cables that have BNC connectors.
3 Operation This chapter describes the proper methods for setting up the Impedance Analyzer, connecting the probe adapter, fixture compensation with the 42941A, and DUT measurement.
Operation Impedance Analyzer Setup Impedance Analyzer Setup Before beginning measurements, you should perform the adapter setup to extend the calibration plane from the surface of the four-pair terminal to the tip of the probe. Also refer to the operation manual of the Impedance Analyzer for more information on the adapter setting. NOTE For adapter setup, use the furnished short and load devices.
Operation Connecting Probe Adapter Connecting Probe Adapter Probe adapters are furnished with the 42941A to measure DUTs of various shapes and characteristics. Attach the appropriate probe adapter for your DUT. Connecting Pin Probe Attach the pin probe to the 3.5-mm connector top of the probe and insert the pin. WARNING The pin is sharp and potentially hazardous to personnel. When using or changing, handle the pin probe with care to prevent injury.
Operation Connecting Probe Adapter Connecting Ground Lead Remove the screw fixing the ground contact to detach the contact. Use the removed screw to attach the ground lead to the pin probe.
Operation Connecting Probe Adapter Connecting BNC Adapter Attach the BNC adapter to the 3.5-mm connector on top of the probe. Figure 3-3 Connecting BNC Adapter Connecting Clip Lead Attach the BNC adapter to the probe and then attach the clip lead to the adapter.
Operation Fixture Compensation Fixture Compensation In an actual measurement, a probe adapter is attached to the probe. Fixture compensation is required for compensating residual impedance and admittance. The fixture compensation includes OPEN and SHORT compensation measurements. For more information on fixture compensation, also refer to the Impedance Analyzer Operation Manual. NOTE Generally, there is no need to perform load compensation.
Operation Fixture Compensation 2. Press OPEN key to start the OPEN compensation data measurement. When the OPEN compensation data measurement is completed, the softkey label OPEN on OFF (if it is off) changes to OPEN ON off. Performing Short Compensation 1. Put the probe adapter into the SHORTed state as shown in Figure 3-6. Use an appropriate device for shorting since no short device is supplied with the BNC adapter.
Operation DUT Measurement DUT Measurement Before performing DUT measurement, open and short compensation should be done as described in the previous sections. DUT Measurement Using Pin Probe When measuring implemented circuits, mounted devices, and printed circuit patterns, use the pin probe. Figure 3-7 DUT Measurement Using Pin Probe NOTE The pin of the pin probe is replaceable. Replace it when damaged or dirty.
Operation DUT Measurement appropriate DC-blocking capacitor to the probe. Figure 3-8 Adjusting Pin-to-GND Gap DUT Measurement Using Ground Lead Use the ground lead to ground the probe to a distant point(Figure 3-9). When you attach the ground lead to the pin probe, detach the ground contact (refer to Figure 3-2).
Operation DUT Measurement DUT Measurement Using BNC Adapter The BNC adapter is used to measure I/O terminals or cables that have BNC connectors. It is also used as a mounting base for the alligator lead. Figure 3-10 DUT Measurement Using BNC Adapter DUT Measurement Using Clip Lead Use the clip lead to measure devices with leads that are large or mounted on the circuit board.
4 Specifications This chapter provides specifications of the 42941A test fixture.
Specifications Specifications Specifications Applicable Instruments Impedance Analyzer Frequency 40 Hz to 110 MHz Maximum Voltage ± 42 V peak max. (AC+DC) Output Impedance 25 Ω (Nominal) DC coupled Operating Environment temp. -20°C to +75°C (except four-terminal pair connection block) 0°C to +55°C (four-terminal pair connection block) humidity 15% to 95%RH ( @ wet bulb temp. < 40°C) Non-operating temp. -40°C to +70°C Environment humidity ≤ 90 % RH ( @ wet bulb temp.
5 Service This chapter provides information on servicing and proper maintenance.
Service Maintenance Maintenance An exploded view of the 42941A for parts identification is shown in Figure 5-1 and Figure 5-2. Do not disassemble any further than shown. Maintenance consists principally of cleaning contacts and replacing worn or damaged parts. Take special care when cleaning contacts. To order parts, use the Keysight Technologies part numbers listed in Table 5-1 and Table 5-2.
Service Maintenance Figure 5-1 Replaceable Parts (part 1 of 2) Chapter 5 31
Service Maintenance Table 5-1 Replaceable Parts (part 1 of 2) Reference Designator Part No. Qty. Description 1 42941-60001 1 PROBE 2 42941-65001 1 CHASSIS 3 42941-24001 1 COVER 4 42941-24015 1 KNOB 5 42941-24013 1 GND 6 - 1 CANTACT PROBE 7 42941-60002 1 CONTACT ASSY 8 0515-1718 4 SCR M4X12 9 0515-0914 2 SCR-MACH M3X0.
Service Maintenance Figure 5-2 Replaceable Parts (part 2 of 2) Chapter 5 33
Service Maintenance Table 5-2 Replaceable Parts (part 2 of 2) Reference Designator Part No. Qty. Description 1 42941-00601 1 COVER TOP 2 42941-40002 2 BUSHING 3 1253-0476 4 ADPT BNC-SMB 4 3050-0067 4 WSHR-FL MTLC 5 3050-0789 4 WSHR-FL NM 6 42941-25002 2 SLEEVE 7 2950-0054 2 NUT-HEX-DBL-CHAM 8 2190-0054 2 WSHR-LK INTL T 9 0515-0914 2 SCR-MACH M3X0.
This information is subject to change without notice. © Keysight Technologies 1999, 2015 Edition 4, March 2015 *42941-90010* 42941-90010 www.keysight.
