TB 9-6625-2212-24
(7) Adjust TI ADJUST FOR NULL controls for a minimum indication on true rms
voltmeter. True rms voltmeter will indicate 10 mV.
(8) Repeat (3) through (7) above at 50 kHz, 20 kHz, 10 kHz, 1 kHz, 100 Hz,
and 20 Hz.
b. Adjustments. No adjustments can be made.
10. Notch Frequency Accuracy
a. Performance Check
(1) Connect calibrator OUTPUT HI and LO to TI INPUT.
(2) Connect TI OUTPUT to true rms voltmeter INPUT.
(3) Position controls as listed in (a) through (d) below:
ADJUST FOR NULL controls centered.
(a)
MODE pushbutton to NOTCH.
(b)
ATTEN pushbutton to 0 dB.
(c)
NOTCH FREQUENCY switch to 20 Hz.
(d)
(4) Set calibrator for a 0 dBm, 20 Hz output.
(5) Adjust calibrator frequency for minimum indication on true rms voltmeter.
Calibrator frequency readout will indicate between 19.6 and 20.4 Hz.
(6) Repeat technique of (3) through (5) above for settings listed in table 3.
Calibrator frequency readout indications will be within limits specified.
Table 3. Frequency Accuracy
Test instrument
NOTCH
FREQUENCY switch
Calibrator frequency readout indications
and calibrator output
settings
Min
Max
100 Hz
98
Hz
102
Hz
1 kHz
980
Hz
1020
Hz
10 kHz
9.8
kHz
10.2
kHz
20 kHz
19.6
kHz
20.4
kHz
50 kHz
49
kHz
51
kHz
100 kHz
98
kHz
102
kHz
b. Adjustments. No adjustments can be made.