NI PXIe-4464 Calibration Procedure | © National Instruments | 13
8. Repeat steps 2 through 7 for the 51.2 kS/s sample rate. When performing step 2, set the rate
parameter to 51200 and the samples per channel parameter to 25600.
9. Repeat steps 2 through 8 for each gain setting of the device. When performing step 2, set
the gain
1
parameter to -10, 0, 10, 20, and 30 as required.
IEPE Current Verification
Note This performance characteristic is not affected by adjustment. Consequently,
reverification after adjustment is not necessary.
Complete the following steps to verify the IEPE current:
1. Set the digital multimeter to the AMPS function and a range suitable to measure currents
between 4 mA and 20 mA.
2. Using the equipment described in Table 1, connect the AMPS input of the digital
multimeter to the analog input channel 0 of the device.
3. Create and configure an AI voltage task on the device as shown in Table 12.
10 4.7 10.8
20 2.0 4.3
30 1.4 2.8
1
Refer to Table 3 for the maximum and minimum voltages to specify to ensure the specified gain range is
used on the module.
Table 12. IEPE Current Verification Configuration
Configuration Value
Physical channel Dev_name/ai0
Gain
*
-20 (dB)
Coupling AC
Terminal configuration Pseudodifferential
Excitation (IEPE) 0.004 (A)
Acquisition mode Finite number of samples
Rate 204800.0
Samples per channel 10240
*
Refer to Table 3 for the maximum and minimum voltages to specify to ensure the specified gain range
is used on the module
Table 11. AI Noise Limits (Continued)
Device Gain (dB)
f
s
= 51.2 kS/s
Max (µV
rms
)
f
s
= 204.8 kS/s
Max (µV
rms
)
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