TB 9-6625-2317-40
(a) SOURCE FREQ to 1000 Hz.
(b) SOURCE LEVEL to 246 mV.
(c) SPCL 75.
(d) ANALYZER DIST (on).
(5) Configure measuring receiver for frequency measurements.
(6) On AM/FM test source, set TEST MODE switch to AM and adjust CARRIER
FREQUENCY TUNE control for 12.5 MHz display indication on measuring receiver.
(7) Configure measuring receiver for AM measurement and record amplitude
modulation displayed indication.
(8) Connect equipment as shown in figure 5, CONNECTION B.
(9) TI LEVEL/DATA ENTRY display will indicate within 2.5% +1 count of the
recorded value in (7) above.
(10) Audio analyzer display will indicate <0.3% distortion for models S/N without
2012 as leading numbers or ≤1% for models S/N with 2012 as leading numbers.
(11) Connect equipment as shown in figure 5, CONNECTION A.
(12) On audio analyzer, press SOURCE LEVEL pushbuttons to 492 mV.
(13) On measuring receiver, record amplitude modulation displayed indication.
(14) Connect equipment as shown in figure 5, CONNECTION B.
(15) TI LEVEL/DATA ENTRY display will indicate within 2.5% +1 count of the
recorded value in (13) above.
(16) Audio analyzer display will indicate <0.6% distortion for models S/N without
2012 as leading numbers or ≤2% for models S/N with 2012 as leading numbers.
b. Adjustments. No adjustments can be made.
13. FM Accuracy and Distortion
a. Performance Check
(1) Connect equipment as shown in figure 6, CONNECTION A.
(2) On AM/FM test source, set TEST MODE switch to FM.
(3) Set audio analyzer SOURCE LEVEL to 229 mV and LP FILTER to 80.
(4) Configure measuring receiver for frequency measurements.
(5) On AM/FM test source, adjust CARRIER FREQUENCY TUNE control for
100 MHz displayed indication on measuring receiver.
(6) Configure measuring receiver for FM measurement and record frequency
modulation displayed indication.
NOTE
Add filters on measuring receiver as necessary to indicate a
stable reading.
