AM-48 Test Set (18-0015) Operating Instructions
0015-S07
7-7
6. Use Switches 3, 14, and 15 to connect a speaker or earphone to
the desired monitoring point and adjust volume. As a rule, leave
Switch 3 <OFF>.
7. Leave Switch 8 in <NOR> unless it is desired to avoid
transmission of tones in the signaling frequency band (in which
case, set to <SF SKIP>).
8. Use Switch 9 as required to Store and Recall setups or output
information to the Printer port. See ¶7.36 and 7.39.
9. Leave Switch 12 in <ON HK> except to go
off-hook on 2-wire
dial access lines. <TONE> and <PULSE> are
off-hook positions
and connect a 200Ω DC short across T and R.
Display Damping Switch . Set Switch 3 to <OFF> for a normal
display update of four (4) times per second, or to <DAMP> to slow the
display update to two (2) times per second.
Switch 3 also affects the monitor point of the speaker. Refer to the
upper part of Figure 9-1 with the descriptions below:
1. With Switch 14 set to <MON RCV> and Switch 3 set to <OFF>,
the speaker monitors the signal on the <RCV> jack (T1, R1) for
4-wire operation.
2. With Switch 14 set to <MON RCV> and Switch 3 set to <DAMP>,
the speaker monitors the received signal (from T1, R1 in 4-wire
operation, or T, R in 2-wire operation) at a point following the
noise weighting filter, notch filter (if in use), and auto-ranging
amplifiers. This is particularly useful for audibly monitoring the
residual noise in notched noise and S/N ratio measurements.
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