TB 9-4931-217-40
(c) FUNCTION switch to NORMAL.
(d) GENERATOR OUTPUT +/OFF/- switch to + (positive).
(8) Adjust resistance decade dials for a null indication on TI meter while decreasing
DETECTOR RANGE switch to 30 MICROVOLTS.
(9) Set DEVIATION RANGE switch to +1 ppm and DEVIATION dial to X0. If
TI meter does not indicate a null, perform b (1) below.
(10) Set DETECTOR RANGE switch to 300 MICROVOLTS and DEVIATION
RANGE switch to +.001%. If TI meter does not indicate a null, perform b (2) below.
(11) Set DETECTOR RANGE switch to 3 MILLIVOLTS and DEVIATION
RANGE switch to +.01%. If TI does not indicate a null, perform b (3) below.
(12) Set DETECTOR RANGE switch to 30 MILLIVOLTS and GENERATOR
OUTPUT +/OFF/ - switch to OFF.
b. Adjustments
NOTE
Remove upper CALIBRATION TRIMMERS cover to gain
access to adjustments.
(1) Adjust RANGE 1 trimmer for a null indication on TI meter (R).
(2) Adjust RANGE 10 trimmer for a null indication on TI meter (R).
(3) Adjust RANGE 100 trimmer for a null indication on TI meter (R).
39. 100 Ohm Decade Linearization
a. Performance Check
(1) Position controls as listed in (a) through (d) below:
(a) MULTIPLIER switch to 100 X STANDARD.
(b) DEVIATION RANGE switch to +0.1 ppm.
(c) DEVIATION dial to X0.
(d) Resistance decade dials to 0000TEN0.01(00).
(2) Adjust DETECTOR ZERO control for a null indication on TI meter while
decreasing DETECTOR RANGE switch to 3 MICROVOLTS (most sensitive range).
(3) Set DETECTOR RANGE switch to 1000 MICROVOLTS and GENERATOR
OUTPUT +/OFF/- switch to + (positive).
(4) Adjust resistance standard no. 1 for a null indication on TI meter while
decreasing DETECTOR RANGE switch to 3 MICROVOLTS (most sensitive range).
NOTE
If null indication cannot be obtained using resistance standard,
adjust DEVIATION dial to complete null indication.
