TB 9-6625-2146-35
Table 4. Dc Current - Continued.
Digital voltmeter indications (mV dc)
Test instrument
SRI, Models C-CILKI and C-CILORD
ME-221/U and Weston, Models 430,
range
901, 931, and 622 series
0.25%
0.5%
Min
Max
Min
Max
2.5 A
---
---
24.875
25.125
3 A
29.925
30.075
29.85
30.15
5 A
49.875
50.125
49.75
50.25
7.5 A
74.813
75.187
74.625
75.375
10 A
---
---
99.5
100.5
15 A
---
---
14.925
15.075
20 A
19.95
20.05
19.90
20.10
25 A
---
---
24.875
25.125
30 A
29.925
30.075
29.85
30.15
50 A
---
---
49.75
50.25
10. Ac Volts
a. Performance Check
(1) Set TI function switch (if applicable) to ac volts and set range switch to lowest
range.
(2) Connect ac calibrator (A1) to TI.
(3) Adjust ac calibrator to mid-frequency of frequency range (if applicable) as listed
in table 5 and voltage output for full-scale indication on TI. Ac calibrator will indicate
within limits specified under accuracy in table 5 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.
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