AM-48 Test Set (18-0015) Unit Description
0015-S03
-1
Note: In 2-wire mode, the signal generator source
impedance will terminate the line with 600 or
900 ohms, regardless of the position of
<TERM> / <BRDG>. If the "QUIET" send
mode is selected while in 2-wire bridge mode,
the signal generator will be disconnected from
the send pair, and the send pair source
impedance will be >25 kohms. This will
allow the <TERM> / <BRDG> switch to
function.
14
Speaker Control . Two-position toggle and momentary
switch. See Figure 9-1 for a block diagram showing how
this switch interacts with Switch 3.
• Set <MON RCV> to connect the internal speaker to
audibly monitor the
receive pair.
• Set <MON SND> to connect the internal speaker to
audibly monitor the
send pair.
• Push <TALK> to mute the speaker and connect the
internal microphone to allow "talking" over the send pair.
This feature is useful in voice communication with an
assistant technician at the distant end of the transmission
line being tested. It also allows the AM-48 to be used as a
conventional push-to-talk telephone set on 2-wire dial
networks. See ¶7.38 for more details.
15
Volume Control . This controls the gain of the internal
speaker amplifier. Use this to set the speaker or earphone
loudness to a comfortable level.
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