TB 9-6625-2146-24
Table 4. Dc Voltage - Continued
Calibrator indications (V)
TS-340/U and Weston, Models
TS-433/U
Test instrument
430, 455, 622 series, 901 and 931
range
r0.25%
r0.5%
Min
Max
Min
Max
75
V
---
---
74.625
75.375
100
V
---
---
99.50
100.5
125
V
---
---
124.37
125.63
150
V
149.625
150.375
149.25
150.75
200
V
---
---
199.0
210.0
250
V
---
---
248.75
251.23
300
V
---
---
298.5
301.5
400
V
---
---
398.0
402.0
450
V
---
---
447.75
452.25
500
V
---
---
497.5
502.5
600
V
---
---
597.0
603.0
750
V
---
---
746.25
753.75
1000
V
---
---
995.0
1005.0
9. Dc Amps
a. Performance Check
(1) Set TI function switch (if applicable) to dc amps and set range switch to
lowest range.
(2) Connect equipment as shown in figure 1.
NOTE
Position dc current shunt range plugs as required for range
being calibrated. Also set decade resistor controls as required
for current limiting and remove when current exceeds decade
resistor current capability.
(3) Adjust dc power supply no. 1 and decade resistor as required for full-scale
indication on TI meter. Multimeter will indicate within limits specified under accuracy in
table 5 for TI being calibrated.
NOTE
Perform tracking and linearity check on a convenient range at
cardinal points two-thirds and one-third of full scale.
Indications will be within stated percent of full scale for each
cardinal point.
(4) Repeat technique of (1) and (3) above for remaining ranges.
b. Adjustments. No adjustments can be made.