NI 9218 Calibration Procedure
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© National Instruments
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23
EEPROM Update
When an adjustment procedure is completed, the NI 9218 internal calibration memory
(EEPROM) is immediately updated.
If you do not want to perform an adjustment, you can update the calibration date and onboard
calibration temperature without making any adjustments by initializing an external calibration,
setting the C Series calibration temperature,
and closing the external calibration.
Reverification
Repeat the
section to determine the As-Left status of the device.
Note
If any test fails Reverification after performing an adjustment, verify that you
have met the
and have run verification with another measurement
adapter before returning your device to NI. Refer to
Worldwide Support and Services
for assistance in returning the device to NI.
Accuracy Under Calibration Conditions
The values in the following table are based on calibrated scaling coefficients, which are stored
in the onboard EEPROM.
The following accuracy table is valid for calibration under the following conditions:
•
Ambient temperature 23 °C ± 5 °C
•
NI 9218 installed in slot 8 of an NI cDAQ-9178 chassis
•
Slots 1 through 7 of the NI cDAQ-9178 chassis are empty
*
The accuracy is inclusive of the NI 9982, NI 9983, and NI 9987.
Table 32.
NI 9218 Accuracy Under Calibration Conditions
*
Mode
Percent of Reading (Gain Error)
Offset Error
20 mA
0.42%
8 µ
Α
60 V
0.33%
8 mV
16 V
0.09%
2 mV
65 mV
0.14%
24
μ
V
IEPE 5 V
0.20%
—
Bridge 22 mV/V, 2 V
0.12%
36 µV/V
Bridge 22 mV/V, 3.3 V
0.12%
7.2 µV/V
