TB 9-6625-2343-40
(14) Press TI keys as listed in (a) through (d) below:
(a) DATA 12.2.
(b) DATA SPCL.
(c) DATA 5.1.
(d) DATA SPCL.
(15) Alternately switch TI DETECTOR between PEAK+ and PEAK- and note the
display for each detector.
(16) Adjust A51R12 TRAPEZOID SYMM (fig. 8) until the readings are the same for
both detectors within 0.010 kHz. (R)
(17) Press TI keys as listed in (a) and (b) below:
(a) MEASUREMENT FM.
(b) CALIBRATION CALIBRATE.
(18) Allow TI to take at least two readings.
(19) Adjust A4R50 FM SENS (fig. 9) for a displayed indication between 99.95 and
100.05 percent. (R)
R85
R50
FM
FM
FLATNESS
SENS
FM SENSITIVITY &
FM FLATNESS
A4
Figure 9. A4 board.
(20) Press TI INSTR PRESET key.
(21) Connect TI sensor module to AM/FM test source FM OUTPUT.
(22) Connect calibrator wideband OUTPUT TO AM/FM test source AUDIO INPUT.
(23) Set calibrator for a wideband output frequency of 1 kHz and an amplitude of 500 mV.
(24) Set AM/FM test source TEST MODE switch to FM.
(25) Adjust AM/FM test source CARRIER FREQUENCY TUNE for a TI indication
of approximately 400 MHz.
(26) Press TI keys as listed in (a) through (c) below:
(a) DATA MHz.
(b) MEASUREMENT FM.
(c) DETECTOR AVG.
(27) Adjust calibrator level for a TI indication of 280 kHz.
(28) Press calibrator NEW REF key.
(29) Press TI RATIO key.
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