TB 9-6625-1998-24
Figure 3. AN/URM-127A - adjustments
9. Frequency
a. Performance Check
(1) Connect OUTPUT to audio analyzer INPUT high.
(2) Set ATTENUATOR switch to X1V and adjust TI OUTPUT CONTROL for 1.0
on OUTPUT RMS (VOLTS RMS) meter.
(3) Set FREQ RANGE MULTIPLIER switch to X1K and frequency dial to 200. If
audio analyzer does not indicate between 196.000 and 204.00 kHz, perform b below.
(4) Repeat technique of (3) above at FREQ RANGE MULTIPLIER switch and
frequency dial settings listed in table 4. If audio analyzer does not indicate within limits
specified, perform b below.
Table 4. Frequency
Test instrument
Audio analyzer indications
FREQ RANGE
MULTIPLIER
Min
Max
dial settings
switch settings
X1K
100
98.000
kHz
102.000
kHz
X1K
20
19600.0
Hz
20.400
kHz