NI 9244 User Manual and Specifications
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© National Instruments
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35
Note
Accuracy specifications are valid for L-L, L-N
and L-Earth measurements.
Input noise at 50 kS/s
L-Earth and N-Earth................... 4.22 mV
rms
L-N and L-L
1
.............................. 6 mV
rms
Table 1.
DC and AC Accuracy
Measurement Conditions
Percent of
Reading
(Gain Error)
Percent of
Range
*
(Offset Error)
Calibrated max (-40 °C to 70 °C)
0.17%
0.14%
Calibrated typ (23 °C ±5 °C)
0.043%
0.012%
Uncalibrated max (-40 °C to 70 °C)
0.42%
0.32%
Uncalibrated typ (23 °C ±5 °C)
0.18%
0.08%
*
Range equals 565.7 V (400 V
rms
)
1
The module returns L-N and N-Earth values only. Refer to
Converting L-N Measurements to L-Earth
sections for
details on changing the point of reference of the measurement