TB 9-6625-2146-24
(3) Adjust calibrator to mid-frequency of frequency range (if applicable) as listed in
table 6 and voltage output for full-scale indication on TI. Calibrator will indicate within
limits specified under accuracy in table 6 for TI being calibrated.
(4) Repeat (3) above at low and high frequency listed for TI.
(5) Repeat technique of (1), (3), and (4) above for remaining ranges.
NOTE
Perform tracking and linearity check on a convenient range at
cardinal points approximately two-thirds and one-third of full
scale. Indications will be within stated percent of full scale
for each cardinal point.
b. Adjustments. No adjustments can be made.
Table 6. Ac Voltage
Test
Calibrator indications (V ac)
instrument
Weston, Model 904
Weston, Model 433
Weston, Model 904
Weston, Model 433
range
125 to 450 Hz
125 to 2500 Hz
50 to 125 Hz
25 to 125 Hz
TS-340
Westinghouse, Model
25 to 400 Hz
PY-4
Weston, Model 430
15 to 200 Hz
25 to 2000 Hz
Weston, Model 455
25 to 1000 Hz
r0.5%
r0.75%
r1%
r1.25%
Min
Max
Min
Max
Min
Max
Min
Max
3
2.985
3.015
---
---
2.97
3.03
---
---
4
---
---
---
---
---
---
---
---
5
---
---
4.9625
5.0375
---
---
4.937
5.063
7.5
7.4625
7.5375
---
---
7.425
7.575
---
---
8
---
---
---
---
---
---
---
---
10
---
---
9.925
10.075
---
---
9.875
10.125
15
14.925
15.075
14.888
15.112
14.85
15.15
14.812
15.188
20
---
---
19.85
20.15
---
---
19.75
20.25
30
29.85
30.15
29.775
30.225
29.7
30.3
29.625
30.375
50
49.75
50.25
49.625
50.375
---
---
49.375
50.625
60
---
---
59.550
60.450
---
---
59.45
60.75
75
74.625
75.375
74.438
75.562
74.25
75.75
74.062
75.937
125
---
---
124.06
125.94
---
---
123.44
126.56
150
149.25
150.75
148.88
151.12
148.5
151.5
148.12
151.88
175
---
---
---
---
---
---
---
---
250
---
---
248.12
251.88
---
---
246.88
253.12
300
298.5
301.5
297.75
301.25
297.0
303.0
296.25
303.75
350
---
---
---
---
---
---
---
---
400
389.0
402.0
---
---
---
---
---
---
450
---
---
446.62
453.38
---
---
444.38
455.62
600
---
---
595.50
604.50
---
---
592.50
607.50
700
---
---
---
---
---
---
---
---
750
746.25
753.75
744.38
755.62
742.5
757.5
740.62
759.38
