TB 9-6625-2071-35
10. Channel B Sensitivity
a. Performance Check
(1) Position TI controls as listed in (a) through (d) below:
(a)
FUNCTION switch to RATIO B/A.
(b)
FREQ RESOLUTION, N switch to 1Hz, 106.
(c)
CHANNEL A DC/AC switch to AC.
(d)
CHANNEL A ATTEN switch to X10.
(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 (10) 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 a sine wave, 10 kHz, 1 mVp-p, 50 Ω output. Slowly
increase function generator amplitude until TI indicates 0.001000. If function generator
amplitude exceeds 71 mVp-p (42 mVp-p for AN/USM-459 and 5328AF096), perform b (1)
through (4) below (b (5) through (10) below for AN/USM-459 and 5328AF096).
(5) Repeat (4) above using frequencies and indications listed in table 4.
Function generator
Test instrument
frequencies
indications
10
Hz
0.000001
100
Hz
0.000010
1 kHz
0.000100
100
kHz
0.010000
1 MHz
0.100000
(6) Disconnect function generator from TI.
(7) Connect signal generator OUTPUT RF to TI INPUT B using 50 Ω feedthrough
termination (omit termination for option H60).
(8) Set TI FREQ RESOLUTION, N switch to 10Hz, 105.
(9) Set signal generator for a 10 MHz, 1 mV output. Slowly increase signal
generator amplitude until TI indicates 1.00000. If signal generator amplitude exceeds 25
mV (15 mV for AN/USM-459 and 5328AF096), perform b (1) through (4) below (b (5)
through (10) below for AN/USM-459 and 5328AF096).
(10) Repeat technique of (9) above using frequencies and indications listed in table 5.
If signal generator amplitude exceeds values listed in table 5, perform b (1) through (4)
below (b (5) through (10) below for AN/USM-459 and 5328AF096).