TB 9-5915-214-35
o. Press TYPE parameter key; dC should be displayed in the CUTOFF
FREQUENCY display. If CUTOFF FREQUENCY display does not indicate dC, repeat
steps n and o until dC is displayed.
p. Press INPUT GAIN(db) ∆ control key until display indicates 20.
q. While switching the INPUT GAIN(db) ∇ ∆ controls between 20 and 00, adjust R105
r. Press INPUT GAIN(db) ∇ control key until display indicates 00.
s.
Adjust R176 (fig. 2) for digital multimeter indication of 0 V dc 1
mVdc.
t. Repeat c through s above for CH2.
u. Disconnect equipment setup.
8. Low
Pass/High Pass Response
a. Performance Check
NOTE
then repeat procedures using CH 2.
(1) Connect calibrator to INPUT CH 1.
(2) Connect true rms voltmeter to OUTPUT CH 1.
(3) Press TYPE parameter key until CUTOFF FREQUENCY display indicates bu.
(4) Press INPUT(db) ∇ and OUTPUT GAIN(db) ∇ control keys until displays
indicate 00.
(5) Press MODE parameter key until CUTOFF FREQUENCY display indicates L.P.
(6) Press corresponding keys as listed in (a) through (c) below and verify CUTOFF
FREQUENCY indicates 1.000.
(a) 1 data entry key.
(b) KILO parameter key.
(c) FREQ parameter key.
(7) Adjust calibrator for a 100 Hz, 1 V output and reference true rms voltmeter to 0 dB.
(8) Adjust calibrator for initial output of 1 kHz, 1 V output and then adjust
calibrator frequency to obtain a -3 dB true rms voltmeter indication. If calibrator frequency
does not indicate 1 kHz, 20 Hz, perform b below.
(9) Adjust calibrator for initial output of 2 kHz, 1 V output and then adjust
frequency does not indicate 2 kHz, 40 Hz, perform b below.