TB 9-6695-263-35
(3) Press 2.2 SPCL pushbuttons and allow time for at least two readings. If TI does
not indicate between 99 and 101 percent, perform b below. Record indication for use in
b. Adjustments.
Adjust A2R6 AM SENS (fig. 1) for 100 percent indication on TI
display (R).
a. Performance Check
(1) Connect calibration fixture AM output to TI INPUT.
(3) Press TI MEASUREMENT FREQ pushbutton.
(5) Position TI controls as listed in (a) through (e) below:
(a)
MEASUREMENT AM pushbutton pressed.
(b)
2.0 SPCL pushbuttons pressed.
(c)
HP FILTER 50 Hz pushbutton pressed.
(d)
LP FILTER 3 kHz pushbutton pressed.
(e)
DETECTOR AVG pushbutton pressed.
(6) TI display will indicate 0.01 percent or less.
b. Adjustments. No adjustments can be made.
a. Performance Check
(2) Set calibrator for a wideband output of 20 kHz at an amplitude of 175 mV.
(3) Position TI controls as listed in (a) through (c) below:
(a) All HP FILTER pushbuttons released (off).
(b) All LP FILTER pushbuttons released (off).
(c) DETECTOR PEAK + (positive) pushbutton pressed.
(4) Adjust calibrator wideband output for a 50 percent AM indication on TI display.
(5) Set audio analyzer to measure signal distortion with 80 kHz low-pass filtering.
Distortion will be 0.3 percent or less.
(6) Increase calibrator wideband output for a 95 percent AM indication on TI
display. Measured distortion will be 0.6 percent or less.
(7) Adjust calibrator frequency to 20 Hz and adjust wideband output to maintain 95
percent AM indication on TI display. Measured distortion will be 0.6 percent or less.
(8) Decrease calibrator wideband output for a 50 percent AM indication on TI
display. Measured distortion will be 0.3 percent or less.
(9) Remove cable from TI MODULATION OUTPUT.