TB 9-6625-2071-24
(7) Set oscilloscope triggering for positive slope, auto level, channel 1 source and
DC coupling.
(8) Connect function generator Function Outputs Unbalanced to TI INPUT A using
a 50 Ω feedthrough termination.
(9) Set function generator for a sine wave, 10 kHz, 42 mVp-p, 50 Ω output.
(10) Adjust oscilloscope controls as necessary to view waveform. Adjust A12R26 (fig.
1) for a symmetrical square wave on oscilloscope.
(11) Adjust A12R55 (fig. 1) for a stable TI indication of approximately 10 kHz.
10. Channel B Sensitivity
a. Performance Check
(1) Position TI controls as listed in (a) through (d) below:
FUNCTION switch to RATIO B/A.
(a)
FREQ RESOLUTION, N switch to 1Hz, 106.
(b)
CHANNEL A DC/AC switch to AC.
(c)
CHANNEL A ATTEN switch to X10.
(d)
(2) Connect TI rear panel FREQ STD OUTPUT (10MHz OUT for AN/USM-459
and 5328AF096) to TI INPUT A using 50 Ω feedthrough termination (omit termination for
option H60).
(3) Connect function generator Function Outputs Unbalanced to TI INPUT B using
50 Ω feedthrough termination (omit termination for option H60).
NOTE
In (4) through (9) below the TI indications are not critical but
should be stable. Only the channel B input sensitivity is being
checked.
(4) Set function generator for each sine wave output listed in table 6. Slowly
increase function generator amplitude until TI indicates as listed in table 6. If adjusted
function generator amplitude exceeds limits specified, perform b (1) through (4) below (b (5)
through (10) below for AN/USM-459 and 5328AF096).
Table 6. Channel B Sensitivity.
Function generator
Adjusted function
output (50Ω)
Test instrument
generator output
indication
Amplitude
(mVp-p)
(kHz)
(mVp-p)
≤ 711
10.0
1.0
0.001000
≤ 711
0.010
1.0
0.000001
≤ 711
0.100
1.0
0.000010
≤ 711
1.0
1.0
0.000100
≤ 711
100.0
1.0
0.010000
≤ 711
1000.0
1.0
0.100000
<42 mVp-p for AN/USM-459 and 5328AF096
1