TB 9-6625-2146-24
Table 6. Ac Voltage- Continued
Calibrator indications (V ac)
General Electric, Model
Weston, Model 749
AK-4, Weston, Models 749
400 Hz only
Weston, Model 528
Test
and 633-VA1 At 60 Hz
ME-79/USM-33
25 to 125 Hz
instrument
only
ME-79A/USM-33
range
ME-489/U
50 to 1000 Hz
r2%
r3%
r5%
Min
Max
Min
Max
Min
Max
3
2.94
3.06
---
---
---
---
4
3.92
4.08
---
---
---
---
5
---
---
---
---
---
---
7.5
---
---
---
---
---
---
8
7.84
8.16
---
---
---
---
10
---
---
---
---
---
---
15
14.7
15.3
---
---
---
---
20
---
---
---
---
---
---
30
---
---
---
---
---
---
50
---
---
---
---
---
---
60
---
---
---
---
---
---
75
---
---
---
---
---
---
125
---
---
---
---
---
---
150
147
153
145.5
154.5
142.5
157.5
175
---
---
169.75
180.25
---
---
250
---
---
---
---
---
---
300
294.0
306.0
291.0
309.0
285.0
315.0
350
---
---
339.5
360.5
---
---
400
---
---
---
---
---
---
450
---
---
---
---
---
---
600
588.0
612.0
582.0
618.0
570.0
630.0
700
---
---
679.0
721.0
---
---
750
---
---
727.5
772.5
---
---
11. Ac Amps
a. Performance Check
(1) Set TI function switch (if applicable) to ac current and set range switch to
lowest range.
(2) Connect equipment as shown in figure 2.
(3) Adjust calibrator frequency for 60 Hz and voltage output as required to obtain
full-scale indication on TI. Multimeter will indicate within limits specified under accuracy
in table 7 for TI being calibrated.
(4) Repeat (3) above at low (50 Hz) and high (as applicable) (1000 Hz maximum)
frequency listed for TI.
(5) Repeat technique of (1), (3), and (4) above for remaining ranges.
