4-32
4.2 Operation and features SPM-32A ... SPM-36A
The AFC function ensures that the instrument remains tuned
to the first signal it encounters. If no signal is found the
search will end at one or other of the frequency limits.
Unless the wideband level of a signal (measured with
wideband receiver, WIDE) is not more than 60 dB above the
reference level (40 dB for a bandwidth of 25 Hz (100 Hz), it
will not be found).
Fig. 4-9 A typical search display.
Start frequency: Equal to the current receive frequency. It
can be entered as described in 4.2.3.1 (TUNE) and 4.2.3.2
(STEP).
Threshold: The current value can be used or a new value
can be entered. Default setting -20 dB or dBm.
Example: Setting a threshold level of -50 dB/dBm:
150
74
*
SEARCH
THRESHOLD
50ENTER—
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