NI 9246/9247 Calibration Procedure
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© National Instruments
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5
b.
Configure the AI current task according to Table 3.
c.
Start the task.
d.
For the maximum Test Point calculate and record the AC magnitude for each channel
on the NI 9246/9247. NI recommends using the Extract Single Tone Information VI
to calculate the magnitude. For the minimum test point average the value and record
the result.
Note
The output magnitude of the Extract Single Tone Information is in Apk. To
convert to RMS, use the following equation:
e.
Stop and clear the task.
7.
Compare the average for each channel to the limits in Table 4.
Note
The test limits listed in Table 4 should be used for calibration verification
only. These values only apply under the specific calibration conditions described in
this document, and are not to be construed as general operational specification of the
NI 9246/9247. For operation specification, refer to the most recent
NI 9246
Datasheet
and
NI 9247 Datasheet
at ni.com/manual.
8.
Set the calibrator to Standby mode (STBY).
9.
Repeat steps 3 through 7 for each test point listed in Table 4.
10. Disconnect the calibrator from the device.
Table 3.
NI 9246/9247 Timing Configuration
Sample Mode
Samples Per Channel
Sample Rate (kS/s)
Finite Samples
50,000
50
Table 4.
NI 9246/9247 Verification Test Limits for Accuracy
Test Point
1-Year Limits
Location
Value
Frequency
(Hz)
Lower Limit
Upper Limit
NI 9246
Max
2 Arms
55
1.9913 Arms
2.0087 Arms
Min
0.00 Adc
0.00
-0.023 Adc
0.023 Adc
NI 9247
Max
2 Arms
55
1.9925 Arms
2.0075 Arms
Min
0.00 Adc
0.00
-0.133 Adc
0.133 Adc
Arms
Apk
(
)
2
(
)
÷
=
