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Introduction
WARNING
The procedures in this section are intended only for qualified service
personnel. Do not perform these procedures unless you are qualified to do so.
Failure to recognize and observe normal safety precautions could result in
personal injury or death.
This section includes information on making connections to the Model 2000-SCAN and on
installing the card in a Model 2000/2001/2002 Multimeter. This section is arranged as follows:
Handling precautions —
Explains precautions that must be followed to prevent
contamination to the scanner card assembly. Contamination could degrade the performance of
the scanner card.
Connections —
Covers the basics for connecting external circuitry to the scanner card.
Typical connection schemes —
Provides some typical connection schemes for 2-pole and
4-pole operation.
Card installation and removal —
Summarizes the procedure to install the scanner card in a
multimeter, outlines scanner card output connections, and describes how to remove the card.
Handling precautions
To maintain high impedance isolation between channels, care should be taken when handling
the scanner card to avoid contamination from such foreign materials as body oils. Such
contamination can substantially lower leakage resistances, degrading card performance. To
avoid possible contamination, always grasp the scanner card by the side edges or covers. Do not
touch board surfaces, components, or areas adjacent to electrical contacts.
Dirt build-up over a period of time is another possible source of contamination. To avoid this
problem, operate the multimeter and scanner card in a clean environment. If the card becomes
contaminated, it should be thoroughly cleaned as explained in
Section 4
“Handling and cleaning
precautions”
.
2-2
Card Connections and Installation
Содержание 2000-Scan
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