TB 9-4931-321-24
meter. Function generator frequency display will indicate 980 Hz or less. Difference
between this indication and indication recorded in (3) above will be 70 Hz or more.
b. Adjustments. No adjustments can be made.
11. Bandwidth
a. Performance Check
(1) Adjust function generator frequency for 1000 Hz.
(2) Adjust FREQ control to obtain peak indication on TI meter.
(3) Adjust function generator output amplitude to obtain a 0 (zero) dB indication on
TI meter 0 (zero) to 2 dB scale.
(4) While maintaining function generator output amplitude constant, reduce
function generator frequency until TI meter indicates 1.5 dB on 0 (zero) to 2 dB scale.
Record function generator frequency indication.
(5) While continuing to maintain function generator output amplitude constant,
increase function generator frequency until TI meter indication returns to 0 (zero) dB and
again drops to 1.5 dB. The difference in this function generator frequency indication and
indication recorded in (4) above will be 130 Hz or more.
(6) Turn BANDWIDTH control fully counterclockwise and repeat (1) through
(4) above.
(7) Repeat technique of (5) above. The difference in frequencies will be 15 Hz
or less.
(8) Set INPUT (INPUT SELECTOR) switch to HIGH. Adjust function generator
output amplitude to obtain on-scale indication on TI meter.
on TI meter.
(10) Adjust function generator output amplitude to obtain a 1 dB indication on TI
meter 0 (zero) to 2 dB scale.
(11) Turn BANDWIDTH control fully clockwise. Adjust FREQ control to obtain
peak TI meter indication.
(12) If TI meter does not indicate between 0.5 and 1.5 dB on 0 (zero) to 2 dB scale
(between 0.9 and 1.1 dB), perform b below.
b. Adjustments
(1) Set function generator frequency to 1000 Hz.
(2) Adjust FREQ control to obtain peak indication on TI meter.
(3) Adjust function generator output amplitude to obtain 1 dB indication on TI
meter 0 (zero) to 2 dB scale.
(4) Turn BANDWIDTH control fully counterclockwise.
(5) Adjust FREQ control to obtain peak indication on TI meter.
