TB 9-5915-214-35
(11) Adjust calibrator for initial output of 2 kHz, 1 V output and then adjust
calibrator frequency to obtain a -25.4 dB true rms voltmeter indication. If calibrator
frequency does not indicate 2 kHz, r40 Hz, perform b below.
(12) Adjust calibrator for initial output of 1 kHz, 1 V output and then adjust
calibrator frequency to obtain a -7.6 dB true rms voltmeter indication. If calibrator
frequency does not indicate 1 kHz, r20 Hz, perform b below.
(13) Press MODE parameter key until CUTOFF FREQUENCY display indicates h.P.
(14) Press TYPE parameter key until CUTOFF FREQUENCY display indicates bu.
(15) Adjust calibrator for a 10 kHz, 1 V output and reference true rms voltmeter to 0 dB.
(16) 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, r20 Hz, perform b below.
(17) Adjust calibrator for initial output of 500 Hz, 1 V output and then adjust
calibrator frequency to obtain a -24 dB true rms voltmeter indication. If calibrator
frequency does not indicate 500 Hz, r10 Hz, perform b below.
(18) Press TYPE parameter key until CUTOFF FREQUENCY display indicates bES.
(19) Adjust calibrator for initial output of 500 Hz, 1 V output and then adjust
calibrator frequency to obtain a -25.4 dB true rms voltmeter indication. If calibrator
frequency does not indicate 500 Hz, r10 Hz, perform b below.
(20) Adjust calibrator for initial output of 1 kHz, 1 V output and then adjust
calibrator frequency to obtain a -7.6 dB true rms voltmeter indication. If calibrator
frequency does not indicate 1 kHz, r20 Hz, perform b below.
(21) Repeat technique of (1) through (20) above for CH 2.
b. Adjustments. Perform adjustments as indicated in Section IV if not previously
performed.
9. Cutoff Frequency Accuracy
a. Performance Check
(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.
