TB 9-6625-2102-24
8. Modulation Generator Frequency
a. Performance Check
(1) Initiate audio analyzer and set to measure frequency.
(2) Connect TI MODULATION GENERATOR OUT (600 :) to audio analyzer
INPUT HIGH.
(3) Perform steps as listed in (a) through (c) below for each row in table 3.
(a) Set TI FREQ/PERIOD MULT (Hz/s) to switch settings.
(b) Adjust TI VARIABLE control to settings.
(c) Using audio analyzer, verify frequency indications.
NOTE
All out of tolerance indications, perform b below:
Table 3. Frequency
Test instrument
FREQ/PERIOD MULT (Hz/s)
Audio analyzer
indications
VARIABLE
Switch
control fully
settings
1K/100K
cw
> 100 kHz
-
ccw
<1
kHz
10/1k
cw
>1
kHz
(4) Disconnect TI from audio analyzer and connect to oscilloscope Vertical 1 input.
(5) Set up oscilloscope to measure frequency.
(6) Perform steps as listed in (a) through (c) below for each row in table 4.
(a) Set TI FREQ/PERIOD MULT (Hz/s) to switch settings.
(b) Adjust TI VARIABLE control to settings.
(c) Using oscilloscope, verify frequency indications.
NOTE
All out of tolerance indications, perform b below:
Table 4. Frequency
Test instrument
FREQ/PERIOD MULT (Hz/s)
Oscilloscope
indications
VARIABLE
Switch
settings
control fully
10/1k
ccw
< 10 Hz
.1/10
cw
> 10 Hz
-
< .1 Hz
ccw
(7) Set up oscilloscope to measure duty cycle.
(8) Perform steps as listed in (a) through (c) below for each row in table 5.
(a) Set TI FREQ/PERIOD MULT (Hz/s) to switch settings.
