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NI PXIe-4464 Calibration Procedure
4.
Start the task.
5.
Acquire readings with the NI PXIe-4464. The readings are not used; the task is simply run
to set the device configuration.
6.
Measure the output current on the digital multimeter.
7.
Stop and clear the task.
8.
Compare this value to the appropriate limit in Table 13.
9.
Repeat steps 3 through 8 for each IEPE current setting of the device. When performing
step 3, set the
excitation
parameter to 0.010 and 0.020 as required.
10. After the last IEPE current verification step, turn off the current by performing steps 3
through 7 with the
excitation
parameter in step 3 set to 0.
11. Repeat steps 2 through 10 for all input channels of the device. In step 2, connect the AMPS
input of the digital multimeter to the channel being verified. In step 3, replace
ai0
in the
physical channel
parameter with the channel being verified.
Timebase Frequency Accuracy Verification
Note
All analog inputs on a single device use the same timebase circuitry.
Therefore, the measurements made on one channel are valid for all channels.
Complete the following steps to verify the timebase frequency accuracy:
1.
Using the equipment described in Table 1, connect the output of the function generator to
the analog input channel 0 of the device. Connect a BNC shorting cap to the other device
input channels.
2.
Configure the function generator to output a sine wave of 6.3 V
rms
(8.9 V
pk
) signal, no
offset, at a frequency of 10.000 kHz.
Table 13.
IEPE Current Limits
IEPE Current Setting (mA)
Test Limit
Min (mA)
Max (mA)
4
4.0
4.3
10
9.6
10.4
20
19.3
20.7