Front Panel Features - HP 4934A Operating And Calibration Manual

Front Panel Features
13 IS 11
1 ON/STBY
powers up the complete instrument. In the STBY (standby) mode,
only some circuits have power. When a battery is fitted the
ON/STBY
key has the
following indicators associated with it:
BATTERY - indicates the instrument is powered from the internal battery.
During battery operation, connect the chassis terminal on the side panel to earth
ground.
CHARGING - indicates the instrument is in the STBY (standby) mode with AC
power connected and the battery is charging.
2 HOLD
(RCV) connects the receive hold circuit to the RCV port when testing
dial-up lines.
3 HOLD
(TRMT) connects the transmit hold circuit to the TRMT port when testing
dial-up lines.
4
BRDG
selects a high input impedance (>50 kO) for testing lines that are already
terminated. In BRDG (bridged) mode, it is still necessary to use the
RCV
key to
select the terminating impedance for the line you are testing. This ensures that the
HP 4934A will display the correct results.
5 DIAL connects the T (tip) and R (ring) binding posts to the TRMT port
(transmitter disconnected). To test a dial-up line or talk over the test line, connect
a butt-in to the T and R DIAL binding posts.
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