Keithley 7035, Инструкция по эксплуатации

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3
Card Connections
and Installation
3-1
Introduction
WARNING
The procedures in this section are in-
tended only for qualified service person-
nel. Do not perform these procedures
unless qualified to do so. Failure to rec-
ognize and observe normal safety pre-
cautions could result in personal injury
or death.
The information in this section is arranged as follows:
• Handling precautions
⎯
Explains precautions that
must be followed to prevent contamination to the card
assembly. Contamination could degrade the perfor-
mance of the card.
• Multi-pin (mass termination) connections
⎯
Covers
the basics for connecting external circuitry to the con-
nector card.
• Model 7035 installation and removal
⎯
Provides the
procedure to install and remove the card assembly from
the Model 7001/7002 mainframe.
Handling precautions
To maintain high impedance isolation, take care when
handling the card to avoid contamination from such foreign
materials as body oils. Such contamination can substantially
lower leakage resistances and degrade performance.
To avoid possible contamination, always grasp the relay card
and the connector card by the side edges or shields. Do not
touch the board surfaces or components. On connectors, do
not touch areas adjacent to the electrical contacts. Dirt
buildup over a period of time is another possible source of
contamination. To avoid this problem, operate the mainframe
and card assembly in a clean environment.
If a card becomes contaminated, it should be thoroughly
cleaned as explained in Section 5.
Multi-pin (mass termination)
connections
Since connections to external circuitry are made at the 96-pin
male DIN bulkhead connector, there is no need to separate
the connector card from the relay card. If the connector card
is separated from the relay card, carefully mate them
together and install the supplied 4-40 screw to secure the
cards. Make sure to handle the cards by the edges and shields
to avoid contamination.
The connector will mate to a 96-pin female DIN connector.
Terminal identification for the DIN connector of the multi-
pin connector card is provided by Figure 3-1 and Table 3-1
and can be identified in one of three ways:
1. Mux terminal consisting of banks A-I, channels 1-36.
2. Connector description consisting of rows a-c, pins 1-32.
3. Schematic and component layout designation consisting
of pins 1-96.