TB 9-6625-003-35
(7) Repeat technique of (5) and (6) above for control settings and indications listed
in table 7. Ratio transformer will indicate within limits specified.
Table 7. Range Accuracy
Ratio transformer
Initial ratio
Test instrument (SWR-DB)
indications
transformer settings
switch settings
Min
Max
.001000
20
.000955
.0010471
.010000
30
.009550
.010471
.001000
40
.000955
.0010471
.010000
50
.009550
.010471
.001000
60
.000955
.001047
1Before
proceeding to next step, perform (a) through (d) below:
(a)
Turn TI GAIN control one quarter turn from full counterclockwise position.
(b)
(c)
Multiply ratio transformer indication recorded in (b) above by 100 and adjust ratio transformer controls to indicate the
product.
(d) Increase signal generator amplitude and adjust frequency for peak indication on TI meter. Adjust amplitude for 0
decibel an TI meter.
(8) Set RANGE switch to 10 and adjust oscillator amplitude to minimum.
(9) Set ratio transformer controls to .100000 and adjust test oscillator amplitude for
an on-scale indication on TI meter.
(11) Adjust test oscillator amplitude and TI GAIN control for a 0-dB indication on TI
0 to 10 DB scale.
(12) Set ratio transformer controls to .010000 and set TI RANGE switch to 20.
(13) Adjust ratio transformer controls until TI meter indicates 0 dB.
Ratio
transformer will indicate between .009772 and .010233.
(14) Reduce test oscillator output to minimum and set TI GAIN control one-quarter
turn from fully counterclockwise position.
(15) Repeat (9) through (15) above for remaining positions of RANGE switch.
b. Adjustments. No adjustments can be made.
30. Expanded Range Linearity and Accuracy (exempt AN/GSM-256)
a. Performance Check
(1) Position TI controls as listed in (a) through (c) below:
(a) RANGE switch to 20.
(b) EXPAND switch to 0.0
26