National Instruments PXIe-4480, Calibration Procedure, Page: 29 / 34

NI PXIe-4480/4481 Calibration Procedure | © National Instruments | 29
Timebase Adjustment
2. Using the equipment described in Table 2, connect the output of the function generator to
device input channel 0, as shown in Figure 6. Connect a BNC shorting cap to the other
device input channels.
3. 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 90.000 kHz.
4. Call
D
AQmxAdjustDSATimebaseCal
(DAQmx Adjust DSA Timebase Calibration VI)
with the following parameters:
calHandle :
myCalHandle
referenceFrequency :
90000.0
Voltage Offset Adjustment
5. Using the equipment described in Table 2, connect a BNC shorting cap to each device input
channel, as shown in Figure 1.
6. 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_DC
gain:
0
referenceVoltage:
0.0
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 2, 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