National Instruments NI 9234, Процедура калибровки, Страница: 15 / 17

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NI 9234 Calibration Procedure
Adjustment
The following performance adjustment procedure describes the sequence of operations required
to adjust the NI 9234.
Accuracy Adjustment
Complete the following procedure to adjust the accuracy performance of the NI 9234.
1. Set the calibrator to Standby mode (STBY).
2. Connect the NI 9234 to the calibrator as shown in Figure 1.
3. Adjust the NI 9234.
a. Initialize a calibration session on the NI 9234. The default password is
NI
.
b. Input the external temperature in degrees Celsius.
c. Call the NI 9234 get C Series adjustment points function to obtain an array of
recommended calibration voltages for the NI 9234.
d. Set the calibrator to a reference value determined by the array of recommended
calibration voltages.
e. Set the calibrator to Operate mode (OPR).
f. Call and configure the NI 9234 gain instance of the DAQmx adjustment function
according to Table 20.
g. Set the calibrator to Standby mode (STBY).
h. Repeat steps d through g for each calibration voltage in the array.
i. Disconnect the NI 9234 from the calibrator.
j. Short AI+ and AI- on the BNC connector together for the channel under adjustment
on the NI 9234.
k. Take a measurement using the NI 9234 offset instance of the DACQmx adjust function
for the channel under adjustment.
l. Close the calibration session.
4. Repeat steps 1 through 3 for each channel on the NI 9234.
EEPROM Update
When an adjustment procedure is completed, the NI 9234 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.
Table 20.
Adjustment Configuration
Physical Channel Reference Value
cDAQMod8/ai
x
The reference value from the array of adjustment points