TB 9-5915-214-35
h. Alternate calibrator and TI frequencies between 25.6 kHz and 175 kHz using
technique of c above to enter TI frequency. Adjust C237 (fig. 1) for a -3 dB true rms
voltmeter indication or split the difference between the two readings.
i.
Press MODE parameter key until CUTOFF FREQUENCY display indicates h.P.
j. Alternate calibrator and TI frequencies between 25.6 kHz and 175 kHz, using
technique of c above to enter TI frequency. Adjust C207 (fig. 1) for a -3 dB true rms
voltmeter indication or split the difference between the two readings.
k. Press corresponding keys as listed in (1) through (5) below and verify CUTOFF
FREQUENCY indicates 2.100.
(1) 2 data entry key.
(2) . data entry key.
(3) 1 data entry key.
(4) KILO parameter key.
(5) FREQ parameter key.
l.
Adjust calibrator for a 2.1 kHz output.
m. Alternate between hP and LP. Adjust R230 (fig. 1) for a -3 dB true rms voltmeter
indication or split the difference between the two readings.
n. Press MODE parameter key until CUTOFF FREQUENCY display indicates L.P.
o. Set calibrator and TI frequencies for a 256 kHz output, using technique of c above to
enter TI frequency. If true rms voltmeter does not indicate -3 dB, adjust C234 (fig. 1) until
true rms voltmeter indicates -3 dB.
p. Alternate calibrator and TI frequencies between 25 kHz and 250 kHz using
technique of c above to enter TI frequency. Adjust R228 (fig. 1) for a -3 dB true rms
voltmeter indication or split the difference between the two readings.
q. Press MODE parameter key until CUTOFF FREQUENCY display indicates h.P.
r. Set calibrator and TI frequencies for a 256 kHz output, using technique of c above to
enter TI frequency. If true rms voltmeter does not indicate -3 dB, adjust C204 (fig. 1) until
true rms voltmeter indicates -3 dB.
s. Set calibrator and TI frequencies for a 2 MHz output, using technique of c above to
enter TI frequency, but press MEGA instead of KILO. If true rms voltmeter does not
indicate between -2.36 and -3.75 dB, readjust C204 (fig. 1) until true rms voltmeter
indicates between -2.36 and -3.75 dB.
t.
Press MODE parameter key until CUTOFF FREQUENCY display indicates L.P.
u. Set calibrator and TI frequencies for a 256 kHz output, using technique of c above to
enter TI frequency. Verify true rms voltmeter indicates between -2.36 and -3.75 dB.
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