TB 9-5915-214-35
d. Connect true rms voltmeter to rear panel CH 1 OUTPUT using 50Ω termination
and reference true rms voltmeter to 0 dB.
e. Adjust calibrator for a 2 MHz, 0.1 V output. If true rms voltmeter does not indicate 0
dB, 0.01 dB, adjust C265 (fig. 2) until true rms voltmeter indicates 0 dB, 0.01 dB, or as close
to 0 db as possible.
f Press corresponding keys as listed in (1) through (5) below and verify CUTOFF
FREQUENCY indicates 1.500.
(1)
1 data entry key.
(2)
. data entry key.
(3)
5 data entry key.
(4)
MEGA parameter key.
(5)
FREQ parameter key.
g. Adjust calibrator for a 5 MHz, 0.1 V output. If true rms voltmeter does not indicate 0
dB, 0.05 dB, adjust R249 (fig. 2) until true rms voltmeter indicates 0 dB, 0.05 dB, or as close
to 0 db as possible.
h. Repeat b through g above until both indications are within tolerance.
i. Repeat technique of a through h above for CH 2.
19. 2nd Quadriatic Frequency Calibration
b. Press INPUT(db) ∇ and OUTPUT GAIN(db) ∇ control keys until displays indicate 00.
c. Press corresponding keys as listed in (1) through (5) below and verify CUTOFF
FREQUENCY indicates 175.0.
(1)
1 data entry key.
(2)
7 data entry key.
(3)
5 data entry key.
(4)
KILO parameter key.
(5)
FREQ parameter key.
d. Connect calibrator WIDEBAND output to INPUT CH 1 using cable and
termination supplied with calibrator.
e. Connect true rms voltmeter to OUTPUT CH 1.
f. Adjust calibrator for a 175 kHz, 0.1 V output and reference true rms voltmeter to 0 dB.
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. 2) 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. 2) for a -3 dB true rms
voltmeter indication or split the difference between the two readings.
CHANGE 2 15
