NI 9235/9236 Calibration Procedure
18
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Test Limits
The following definitions describe how to use the information from
Tables 5 through 8.
Calibrator Output
The
Calibrator Output
is the calibrator resistance output entered for
verification.
Nominal Value
The
Nominal Value
is the approximate value that the module should read,
given the corresponding calibrator output.
1-Year Limits
The
1-Year Limits
column contains the
Upper Limits
and
Lower Limits
for
the test results. That is, when the device is within its 1-year calibration
interval, the test results should fall between these upper and lower limit
values.
For accuracy verification,
Upper Limits
and
Lower Limits
are given in units
of V/V for verification and units of
με
for reference.
Table 5.
NI 9235 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
)
120
0
0
—
—
—
—
108
0.0263158
–50,000
0.0263048
0.0263268
–49,980.1
–50,019.9
114
0.0128205
–25,000
0.0128149
0.0128261
–24,989.3
–25,010.7
117
0.0063291
–12,500
0.0063261
0.0063321
–12,494.1
–12,505.9
123
–0.0061728
12,500
–0.0061698
–0.0061758
12,493.8
12,506.0
126
–0.0121951
25,000
–0.0121897
–0.0122005
24,988.7
25,011.3
132
–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.