Keithley 7037, Инструкция по эксплуатации

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5
Operation
5-1
Introduction
The information in this section is formatted as follows:
•
Power limits
— Summarizes the maximum power lim-
its of the Model 7037 card assembly.
•
Mainframe control of the card
— Summarizes pro-
gramming steps to control the card from the Model
7001/7002 Switch System mainframe.
•
Measurement considerations
— Reviews a number of
considerations when using the Model 7037 to make
measurements.
Power limits
CAUTION
To prevent damage to the card, do not
exceed the maximum signal level speci-
fications of the card. For reactive loads,
be sure to use voltage clamping and cur-
rent limiting as explained in the Reac-
tive loads paragraph.
Digital I/O maximum signal levels
Output channels
Maximum user-supplied pull-up voltage: 42V
Maximum sink current:
Per channel: 250mA
Per card: 1A
Input channels
Maximum voltage level: 42V peak
Relay switch maximum signal levels
To prevent overheating or damage to the relays, never exceed
the following maximum signal levels: 110V DC, 110V rms,
155V peak between any two inputs or chassis, 1A switched,
30VA (resistive load).
Reactive loads
Operation is specified for resistive loads. Reactive loads
require voltage clamping (for inductive loads) and current
surge limiting (for capacitive loads) to prevent damage to the
relays and to external circuitry.