TB 9-6625-1998-24
NOTE
Increase capacitance of C5 and decrease capacitance of C13
(12) Set frequency dial to 200.
(13) Adjust C14 (fig. 2) until audio analyzer indicates 200.00 kHz (R).
(14) Set frequency dial to 20 and repeat (11) through (13) above for best in-tolerance condition.
(15) Repeat a (1) through (4) above and, if required, (1) through (14) above for best
intolerance condition.
(16) Set FREQ RANGE MULTIPLIER switch to X100 and frequency dial to 20.
(17) Readjust frequency dial until audio analyzer indicates 2000.0 Hz.
(18) Reposition frequency dial to indicate 20.
NOTE
Remove frequency dial knob and loosen set screws to reposition
dial to 20. Tighten set screws after repositioning dial.
(19) Set frequency dial to 200.
(20) Adjust A3C3 and A3C4 (fig. 3) until audio analyzer indicates 20.000 kHz and
VOLTS RMS meter indicates at least 1.0 (R).
(21) Repeat (16) through (20) above for best in-tolerance condition.
(22) Repeat a (4) and if audio analyzer does not indicate within limits specified,
perform (23) through (26) below.
(23) Set FREQ RANGE MULTIPLIER switch to X1K and frequency dial to 200.
(24) Adjust A2C1 (fig. 3) until audio analyzer indicates 200.00 kHz (R).
(25) If VOLTS RMS meter indicates more than 1.2, adjust A2R5 (fig. 3) for 1.2
indication on VOLTS RMS meter (R).
(26) Repeat a (1) through (4) and, if required, (16) through (25) above for best
intolerance condition.
10. Frequency Meter (AN/URM-127 Only)
a. Performance Check
(1) Connect OUTPUT to audio analyzer INPUT high.
(2) Set FREQ RANGE MULTIPLIER switch to X10 and FREQ METER switch to
ON.
(3) Set frequency dial to 40, and fine tune for maximum vibration on 400 window of
FREQ METER. Audio analyzer will indicate between 396.00 and 404.00 Hz.
(4) Set FREQ RANGE MULTIPLIER switch to X1 and frequency dial to 60.
(5) Fine tune frequency dial for maximum vibration on 60 window of FREQ
METER. Audio analyzer will indicate between 59.400 and 60.600 Hz.
