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Figure 1. Bridge resistance - equipment setup.
Ratio Arm Calibration

Calibration Procedure For Model 230B, 860A, 865A, 290A, B, 801, And Sp2979 Page Navigation
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TB 9-4931-217-40
Table 4. Rheostat Arm Accuracy - Continued
Test instrument resistance
indicating (significant)
Resistance measuring system
dial settings
indications (ohms)
Vernier
Most
2d most
3rd most
4th most
control
Min
Max
1
0
0
0
0
00
---
0.04
0
0
0
1
00
9.9995
10.0005
0
0
0
2
00
19.999
20.001
0
0
0
3
00
29.9985
30.0015
0
0
0
4
00
39.998
40.002
0
0
0
5
00
49.9975
50.0025
0
0
0
6
00
59.997
60.003
0
0
0
7
00
69.9965
70.0035
0
0
0
8
00
79.996
80.004
0
0
0
9
00
89.9955
90.0045
0
0
0
TEN
00
99.995
100.005
0
0
1
0
00
99.995
100.005
0
0
2
0
00
199.99
200.01
0
0
3
0
00
299.985
300.015
0
0
4
0
00
399.98
400.02
0
0
5
0
00
499.975
500.025
0
0
6
0
00
599.97
600.03
0
0
7
0
00
699.965
700.035
0
0
8
0
00
799.96
800.04
0
0
9
0
00
899.955
900.045
0
0
TEN
0
00
999.95
1,000.05
0
1
0
0
00
999.95
1,000.05
0
2
0
0
00
1,999.9
2,000.1
0
3
0
0
00
2,999.85
3,000.15
0
4
0
0
00
3,999.8
4,000.2
0
5
0
0
00
4,999.75
5,000.25
0
6
0
0
00
5,999.7
6,000.3
0
7
0
0
00
6,999.65
7,000.35
0
8
0
0
00
7,999.6
8,000.4
0
9
0
0
00
8,999.55
9,000.45
0
TEN
0
0
00
9,999.5
10,000.5
1
0
0
0
00
9,999.5
10,000.5
2
0
0
0
00
19,999.0
20,001.0
3
0
0
0
00
29,998.5
30,001.5
4
0
0
0
00
39,998.0
40,002.0
5
0
0
0
00
49,997.5
50,002.5
6
0
0
0
00
59,997.0
60,003.0
7
0
0
0
00
69,996.5
70,003.5
8
0
0
0
00
79,996.0
80,004.0
9
0
0
0
00
89,995.5
90,004.5
10
0
0
0
00
99,995.0
100,005.0
11
0
0
0
00
109,994.5
110,005.5
1 Repeat (3) and (4) above for remaining resistance indicating dial settings listed in table 4.
b. Adjustments. No adjustments can be made.
10 CHANGE 1


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