TB 9-4931-700-50
(t) Repeat technique of (n) through (r) above for A12A4. Replace A12A4 in
TI.
(13) Repeat a(1) through (4) above.
9. Error Measurement
a. Performance Check
(1) Insert adapter (B1) between TI and autotransformer (A2) and connect
OUTPUT and SENSE terminals to ratio transformer (A8), using hook-up wire (B9).
Monitor output of ratio transformer, using ac/dc voltmeter (A1) and hook-up wire.
(2) Position TI controls as listed in (a) through (f) below:
(a) Press VOLTAGE RANGE 1V pushbutton.
(b) Set voltage controls to obtain indication of 1.000000 v
(c) Adjust FREQUENCY control to obtain FREQ scale indication of 1.
(d) Press FREQUENCY RANGE X1K pushbutton.
(e) Press ERROR RANGE 0 pushbutton.
(f) Press SENSE REMOTE pushbutton.
(3) Set ratio transformer dials to 1.000000 and record ac/dc voltmeter indication.
(4) Press ERROR RANGE X1 pushbutton and adjust ERROR MEASUREMENT
control to obtain an indication of 0 (zero) on % ERROR scale. If ac/dc voltmeter does not
indicate within 0.00017 V of value recorded in (3) above, perform b below.
(5) Repeat technique of (3) and (4) above, using setting and indications listed in
Test Instrument
ERROR RANGE
% ERROR
Ration Transformer
Ac/dc Voltmeter
Setting
Scale Setting
Setting
Indication (V)
Value of 9a(3) above 0.00017
X1
-3
.970874
Value of 9a(3) above 0.00017
X1
-2
.980392
Value of 9a(3) above 0.00017
X1
-1
.990099
Value of 9a(3) above 0.00017
X1
01
1.000000
Value of 9a(3) above 0.00017
X1
+3
1.030929
Value of 9a(3) above 0.00017
X1
+2
1.020408
Value of 9a(3) above 0.00017
X1
+1
1.010101
Value of 9a(3) above 0.000035
X.1
01
1.000000
Value of 9a(3) above 0.000035
X.1
-3
.997009
Value of 9a(3) above 0.000035
X.1
+3
1.003009
1Establish
a new 1-volt reference as in 9a(3) above.
b. Adjustments
(1) Set A1A4S1 (fig. 2) to +9.9 V position.
NOTE
Overload lamp illuminates.
