TB 9-6625-1138-24
(4) Adjust TI FREQUENCY dial to 400 Hz and fine tune for a peak indication on
R.M.S. VOLTS meter.
NOTE
If necessary, increase calibrator output amplitude for at least
three-quarter scale indication on TI R.M.S. VOLTS meter.
(5) Record TI R.M.S. VOLTS meter indication and calibrator output indication.
(6) Adjust calibrator output frequency to 50 kHz and fine tune TI for a peak
indication on R.M.S. VOLTS meter.
(7) Adjust calibrator output until TI R.M.S. VOLTS meter indicates value recorded
in (5) above. If calibrator does not indicate within 5 percent of value recorded in (5) above,
perform b (1) and (2) below.
(8) Repeat technique of (3) through (7) above for TI switch setting listed in table 5.
If calibrator does not indicate within limits specified in (7) above, perform adjustments
listed in table 5.
Table 5. Frequency Response
Test instrument
Calibrator
Adjustments
output amplitude
(fig. 1) (R)
MAX INPUT VOLTAGE
RANGE (VOLTS)
switch position
switch position
0.3
300 MV
280 mV
C4
1
1 V
0.9 V
C1
3
3 V
2.8 V
C8
10
3 V
2.8 V
C2
b. Adjustments
(1) Adjust calibrator output amplitude for indication as established in a (5) above.
(2) Adjust C3 (fig. 1) until TI R.M.S. VOLTS meter indicates value recorded in a (5)
above (R).
11. Selectivity
a. Performance Check
(1) Connect frequency counter and calibrator to TI INPUT terminal using 600
load.
(2) Position controls as listed in (a) through (e) below:
MAX INPUT VOLTAGE switch to 3.
(a)
MODE SELECTOR switch to NORMAL.
(b)
SCALE VALUE switch to RELATIVE.
(c)
RANGE (VOLTS) switch to 3 V.
(d)
FREQUENCY dial to 25 Hz.
(e)
(3) Adjust calibrator output for a 40-ms indication on frequency counter.
(4) Adjust FREQUENCY dial for a peak indication on TI R.M.S. VOLTS meter.
(5) Adjust calibrator amplitude for a 3 V indication on TI R.M.S. VOLTS meter.
(6) Adjust REF ADJUST control for a 0 (zero) dB indication on TI R.M.S. VOLTS meter.