TB 9-6625-1493-35
(3) Polarity switch to + (positive).
(4) NULL switch to .0001.
e. Set POWER switch to LINE OPR and allow a 5 minute warm-up period.
f. Short INPUT and COMMON terminals, then adjust electrical ZERO control for a 0
meter indication.
g. Remove short from INPUT and COMMON terminals.
8. Conventional Voltmeter Accuracy
a. Performance Check
(1) Set NULL switch to TVM.
(2) Connect calibrator OUTPUT to TI INPUT and COMMON terminals.
(3) Set calibrator for an initial 200 mV dc output. Using output adjustment control,
adjust calibrator for a +.2 TI meter indication. Calibrator Error display will indicate
<15 percent ; if not perform, b below.
(4) Adjust calibrator for the initial output, then TI meter indication, as listed in
performed in (3) above, perform b below.
Test instrument
Calibrator
RANGE
Calibrator
Test instrument
Error indications
switch settings
initial outputs
meter indications
≤(%)
1
0.4 V
+.4
7.5
1
0.6 V
+.6
5.0
1
0.8 V
+.8
3.75
1
1.0 V
+1
3.0
11
1.0 V
-1
3.0
1
0.8 V
-.8
3.75
1
0.6 V
-.6
5.0
1
0.4 V
-.4
7.5
1
200
mV
-.2
15
10
10
V
-1
3.0
10
10
V
+1
3.0
2
100
100
V
+1
3.0
1001
100
V
-1
3.0
1000
1000
V
-1
3.0
1000
1000
V
+1
3.0
2
REDUCE CALIBRATOR OUTPUT TO A MINIMUM
1Set
FUNCTION switch to - (negative).
2Set
FUNCTION switch to + (positive).
CHANGE 1
