©
National Instruments Corporation
19
NI 9235/9236 Calibration Procedure
Table 6.
NI 9236 Measurement Accuracy Verification Test Limits
Calibrator
Output
(
Ω
)
Nominal
Value
(V/V)
Nominal
Value
(
με
)
1-Year Limits
Lower
Limit
(V/V)
Upper
Limit
(V/V)
Lower
Limit
(
με
)
Upper
Limit
(
με
)
350
0
0
—
—
—
—
315
0.0263158
–50,000
0.0263048
0.0263268
–49,980.1
–50,019.9
332.5
0.0128205
–25,000
0.0128149
0.0128261
–24,989.3
–25,010.7
341.25
0.0063291
–12,500
0.0063261
0.0063321
–12,494.1
–12,505.9
358.75
–0.0061728
12,500
–0.0061698
–0.0061758
12,493.8
12,506.0
367.5
–0.0121951
25,000
–0.0121897
–0.0122005
24,988.7
25,011.3
385
–0.0238095
50,000
–0.0237995
–0.0238195
49,977.8
50,022.1
Note
: The Upper and Lower Limit (V/V) values are commonly used for verification. The Upper and Lower Limit (
με
) values
are for reference.
Table 7.
NI 9235/9236 Shunt Calibration Accuracy Verification Test Limits
Module
Nominal
Value
(
μ
V/V)
Nominal
Value
(
με
)
1-Year Limits
Lower
Limit
(
μ
V/V)
Upper
Limit
(
μ
V/V)
Lower
Limit
(
με
)
Upper
Limit
(
με
)
NI 9235
–599.28
1200.0
–597.96
–600.60
1197.3
1202.7
NI 9236
–873.47
1750.0
–871.72
–875.22
1746.5
1753.5
Note
: The Upper and Lower Limit (
μ
V/V) values are commonly used for verification. The Upper and Lower Limit (
με
)
values are for reference.
Table 8.
NI 9235/9236 Excitation Voltage Verification 1-Year Test Limits
Module
Lower Limit (V)
Upper Limit (V)
NI 9235
1.980
2.020
NI 9236
3.267
3.333