National Instruments NI PXIe-4464

8 | ni.com | NI PXIe-4464 Calibration Procedure
AI Gain Accuracy Verification
Complete the following steps to verify the AI gain accuracy:
1. Using the equipment described in Table 1, connect the output of the calibrator to the analog
input channel 0 of the device.
2. Configure the calibrator to generate an output with the amplitude and frequency listed in
the -20 dB gain row of Table 5.
3. Create and configure an AI voltage task on the device as shown in Table 6.
Table 5. AI Gain Accuracy Limits
Device
Gain
(dB)
Calibrator Output
As Found Test
Limit
As Left Test Limit
Amplitude
(V
rms
)
Frequency
(Hz)
Min
(V
rms
)
Max
(V
rms
)
Min
(V
rms
)
Max
(V
rms
)
-20 6.3 1000 6.27828 6.32180 6.29606 6.30394
-10 6.3 1000 6.27828 6.32180 6.29606 6.30394
0 6.3 1000 6.27828 6.32180 6.29606 6.30394
10 2.0 1000 1.99310 2.00692 1.99875 2.00125
20 0.63 1000 0.62783 0.63218 0.62961 0.63039
30 0.2 1000 0.19931 0.20069 0.19988 0.20013
Table 6. AI Gain Verification Configuration
Configuration Value
Physical channel Dev_name/ai0
Gain
*
-20 (dB)
Coupling AC
Terminal configuration Pseudodifferential
Excitation (IEPE) 0 (A)
Acquisition mode Finite number of samples
Rate 204800.0
Samples per channel 102400
*
Refer to Table 3 for the maximum and minimum voltages to specify to ensure the specified gain range
is used on the module.