TB 9-6625-2343-40
(30) Change calibrator output frequency to 150 kHz.
(31) Adjust A4R85 FM FLATNESS (fig. 9) for a display between 99.9 and 100.1 percent. (R)
(32) Press TI keys as listed in (a) through (c) below:
(a) INSTR PRESET.
(b) HP FILTER 300 Hz.
(c) LP FILTER 3 kHz.
(33) Set calibrator for a wideband output frequency of 1 kHz at an amplitude of 500 mV.
(34) Move TI sensor module from AM/FM test source FM OUTPUT to FM/4 OUTPUT.
(35) Adjust AM/FM test source CARRIER FREQUENCY TUNE for a TI indication
of approximately 100 MHz.
(36) Press TI keys as listed in (a) and (b) below:
(a) DATA MHz.
(b) MEASUREMENT FM.
(37) Adjust calibrator output for a TI indication 100 kHz.
(38) Press TI MEASUREMENT ΦM key.
(39) Adjust A3R27 PM SENS (fig 10) for a TI indication of 100 0.2 rad. (R)
(40) Reduce all outputs to minimum and disconnect equipment setup.
PHASE MODULATION
SENSITIVITY
Figure 10. A3 board.
10. Phase Modulation
a. Performance Check
(1) Press TI INSTR PRESET key.
(2) Set AM/FM test source TEST MODE switch to FM and connect equipment as
shown in figure 11 below.