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Chapter 24, Connector, Key, and Knob Descriptions
Connector Descriptions
Chassis Ground
The rear-panel chassis ground terminal provides a general chassis connection, as
well as providing a safety ground when dc power is used.
WARNING: To prevent a potential shock hazard, always connect the chassis ground terminal to earth ground
when operating this instrument from a dc power source.
CRT VIDEO OUTPUT
This connector provides a signal for using an external video monitor. The signal
provides a duplicate of the Test Set’s screen.
Operating Considerations
A multi-sync monitor must be used to match the video sync rate of 19.2 kHz.
Examples of this type of monitor include - Mitsubishi Diamond Scan, NEC 3D,
Leading Edge CMC-141M, and Sony CPD-1302.
DC CURRENT MEASUREMENT
This connector is optional on the HP 8920A.
These connectors are used in series with a DC supply and load to provide a 0 to 10
amp DC current meter.
Operating Considerations
The dc current meter is designed to measure positive current (the connector’s
polarity is marked on the rear panel). Negative current of
≤10 amps will not
damage the instrument, but will cause inaccurate positive current measurements
(due to magnetic memory within the current-sensing element).
To recalibrate the current meter after negative current has been applied:
1. Connect a 10 amp positive current.
2. Disconnect the current.
3. Access the AF ANALYZER screen.
4. Select the DC Current Zero field to zero the meter.
See Also
"Displaying Measurements" on page 57
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