Performance Verification; Environmental Conditions; Recommended Equipment; Multiplexer Connections - Keithley 7021 Instruction Manual

Service Information
Performance verification
The following paragraphs discuss performance verification
procedures for the Model 7021, including path resistance,
offset current, contact potential, and isolation.
With the Model 7021's backplane jumpers installed, the per-
formance verification procedures must be performed with
only one card (the one being checked) installed in the Model
7001/7002 mainframe. These conditions do not apply if the
backplane jumpers are removed.
CAUTION
Contamination will degrade the perfor-
mance of the card. To avoid contamina-
tion, always grasp the card by the side
edges and shields. Do not touch the con-
nectors and do not touch the board sur-
faces or components. On plugs and
receptacles, do not touch areas adjacent
to the electrical contacts.
NOTE
Failure of any performance verification
test may indicate that the card is contami-
nated. See the Handling and cleaning pre-
cautions paragraph to clean the card.
Table 6-1
Verification equipment
Description
DMM
Electrometer w/voltage source
Sensitive Digital Voltmeter
Triax cable (unterminated)
Low thermal cable
(unterminated)
6-2
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Environmental conditions

All verification measurements should be made at an ambient
temperature between 18 ° and 28 ° C and at a relative humidity
of less than 70%.

Recommended equipment

Table 6-1 summarizes the equipment necessary for perfor-
mance verification, along with an application for each unit.

Multiplexer connections

The following information summarizes methods that can be
used to connect test instrumentation to the card. Detailed
connection information is provided in Section 4.
One method to make instrument connections to the card is by
hard-wiring a 96-pin female DIN connector and then mating
it to the connector on the Model 7021. Input and output
shorting connections can also be done at the connector. The
connector in the Model 7011-KIT-R connection kit
(Table 4-1) can be used for this purpose. Pin identification
for the connector is provided by Figure 4-9 and Table 4-2.
Model Specifications
100 Ω ; 0.01%
Keithley Model 2000
Keithley Model 20pA, 200pA; 1%
6517A 100V source; 0.15%
Keithley Model 182 3mV; 60ppm

Keithley Model 7025

Keithley Model 1484
Applications
Path resistance
Offset current, path isolation
Contact potential
Offset current
Contact potential