HP 4937A Operating And Service Manual page 30

MODEL 4937A
LOOP START
Establishing Talk Condition
1
, Seize the line as described in the previous section. Loop Start Terminate End,
2, Connect lineman's handset (butt-in) to DIAL jacks located on the front panel,
3, Press DIAL key. The HP 4937A will provide talk battery and will ac couple lineman's handset to the
line under test,
4, The line is now ready to accept tones or voice.
5, To perform transmission Impairment measurements, release the DIAL key.
6
, Perform desired measurement as described in the Measurements Section,
Releasing The Line
1. Loop start terminate always provides office battery. To remove battery, use 3IG SELECT key to
turn off signaling.
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