TB 9-4931-217-40
(5) Position controls as listed in (a) through (d) below:
(a) GENERATOR OUTPUT +/OFF/- switch to OFF.
(b) DETECTOR RANGE switch to 1000 MICROVOLTS.
(c) FUNCTION switch to LEAD ADJ.
(d) GENERATOR OUTPUT +/OFF/- switch to + (positive).
(6) Adjust LEAD ADJ control for a null indication on TI meter while decreasing
DETECTOR RANGE switch to 3 MICROVOLTS (most sensitive ranger).
(7) Position controls as listed in (a) through (d) below:
(a) GENERATOR OUTPUT +/OFF/- switch to OFF.
(b) DETECTOR RANGE switch to 1000 MICROVOLTS.
(c) FUNCTION switch to YOKE ADJ.
(d) GENERATOR OUTPUT +/OFF/- switch to + (positive).
(8) Adjust YOKE ADJ control for a null indication on TI meter while decreasing
DETECTOR RANGE switch to 3 MICROVOLTS (most sensitive range).
(9) Position controls as listed in (a) through (c) below:
(a) GENERATOR OUTPUT +/OFF/- switch to OFF.
(b) DETECTOR RANGE switch to 1000 MICROVOLTS.
(c) FUNCTION switch to NORMAL.
(10) Repeat (2) through (9) above until no further null adjustment is required.
(11) Turn resistance decade dials to 000100.01(00) and set GENERATOR OUTPUT
+/OFF/- switch to + (positive).
(12) Decrease DETECTOR RANGE switch setting until 3 MICROVOLTS range is
reached or until a full-scale indication is obtained on TI meter. If TI meter does not
indicate null on 3 MICROVOLTS range, perform b below.
(13) Set GENERATOR OUTPUT +/OFF/- switch to OFF and DEVIATION dial to X0.
(14) Repeat (3) through (5) (b) and (11) through (13) above, using resistance
standard and resistance dial settings listed in table 13. If TI meter does not indicate null
on 3 MICROVOLTS range, perform appropriate adjustment listed in table 13.
Table 13. 100 Ohm Decade Linearization
Test instrument
Resistance standard
Resistance decade
Adjustments
1
nominal resistance
dial settings
(behind lower calibration)
(k )
Step
100 ohms
10 ohms
trimmer cover)
1
20
1
TEN
---
2
---
2
0
100 - 2 (R)
3
30
2
TEN
---
4
---
3
0
100 - 3 (R)
35