National Instruments PXIe-4480, Calibration Procedure, Page: 23 / 34

NI PXIe-4480/4481 Calibration Procedure | © National Instruments | 23
Note
Set the gain parameter to the value of the device gain setting being calibrated,
where 0, for example, represents 0 dB.
7. Repeat step 6 for each of the remaining gain ranges, sequentially substituting the gain
parameter with 6, 20, and 26.
Note
All ranges must be adjusted for offset for the calibration to be valid.
Voltage Gain Adjustment
8. Using the equipment described in Table 1, connect the output of the calibrator to all of the
device input channels in parallel, as shown in Figure 2.
9. Configure the calibrator to output a 6.3 V
rms
signal at 1 kHz.
10. Call
DAQmxAdjustDSAAICalWithGainAndCoupling
(DAQmx Adjust DSA AI
Calibration With Gain and Coupling VI from the DAQmx Adjust DSA AI Calibration
Polymorphic VI), using the following parameters:
calHandle :
myCalHandle
coupling :
DAQmx_Val_AC
gain :
0
referenceVoltage :
6.3
Note
Set the gain parameter to the value of the device gain setting being calibrated,
where 0, for example, represents 0 dB.
11. Configure the calibrator to output a 3.15 V
rms
signal at 1 kHz.
12. Repeat step 10 for the 6 dB gain range, substituting the gain parameter with 6 and the
referenceVoltage parameter with 3.15.
13. Configure the calibrator to output a 630 mV
rms
signal at 1 kHz.
14. Repeat step 10 for the 20 dB gain range, substituting the gain parameter with 20 and the
referenceVoltage parameter with 0.63.
15. Configure the calibrator to output a 315 mV
rms
signal at 1 kHz.
16. Repeat step 10 for the 26 dB gain range, substituting the gain parameter with 26 and the
referenceVoltage parameter with 0.315.
Note
All ranges must be adjusted for gain for the calibration to be valid.
Charge Gain Adjustment
Note
Charge gain adjustment is optional. However, if charge adjustment is
conducted on one channel, it must be conducted on all channels to be valid.
17. Using the equipment described in Table 1, connect the output of the calibrator through the
calibration capacitor to device input channel 0, as shown in Figure 4.