Card Connections And Installation; Introduction; Handling Precautions; Connections - Keithley 2001-TCSCAN Instruction Manual

Card Connections and Installation

2.1

Introduction

WARNING
The procedures in this section are in-
tended only for qualified service person-
nel. Do not perform these procedures
unless you are qualified to do so. Failure
to recognize and observe normal safety
precautions could result in personal in-
jury or death.
This section includes information on making connections to
the Model 2001-TCSCAN and on installing the card in the
DMM. This section is arranged as follows:
2.2 Handling precautions: Explains precautions that must
be followed to prevent contamination to the scanner
card assembly. Contamination could degrade the per-
formance of the scanner card.
2.3 Connections: Covers the basics for connecting exter-
nal circuitry to the scanner card.
2.4 Typical connection schemes: Provides some typical
connection schemes for 2-pole and 4-pole operation,
including thermocouple connections.
2.5 Card installation and removal: Summarizes the pro-
cedure to install the scanner card in the DMM, outlines
scanner card output connections, and describes how to
remove the card.
2.2

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 resis-
tances, degrading card performance. To avoid possible con-
tamination, 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 multi-
meter and scanner card in a clean environment. If the card
becomes contaminated, it should be thoroughly cleaned as
explained in paragraph 4.2.
2.3

Connections

This paragraph provides the information necessary to con-
nect your thermocouples or other external test circuitry to the
scanner card.
WARNING
The following connection information is
intended to be used by qualified service
personnel. Failure to recognize and ob-
serve standard safety precautions could
result in personal injury or death.
2
2-1