NI PXIe-4464 Calibration Procedure
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© National Instruments
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17
Gain Adjustment
5.
Using the equipment described in Table 1, connect the output of the calibrator to all of the
device input channels in parallel.
6.
Configure the calibrator to output a 6.3 V
rms
signal at 1 kHz.
7.
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
:
-20
referenceVoltage
:
6.3
Note
Set the
gain
parameter to the value of the device gain setting being calibrated,
where -20, for example, represents -20 dB.
8.
Repeat step 7 for the -10 dB and 0 dB gain ranges, sequentially substituting the
gain
parameter with -10 and 0.
9.
Configure the calibrator to output a 2.0 V
rms
signal at 1 kHz.
10. Repeat step 7 for the 10 dB gain range, substituting the
gain
parameter with 10 and the
referenceVoltage
parameter with 2.0.
11. Configure the calibrator to output a 630 mV
rms
signal at 1 kHz.
12. Repeat step 7 for the 20 dB gain range, substituting the
gain
parameter with 20 and the
referenceVoltage
parameter with 0.63.
13. Configure the calibrator to output a 200 mV
rms
signal at 1 kHz.
14. Repeat step 7 for the 30 dB gain range, substituting the
gain
parameter with 30 and the
referenceVoltage
parameter with 0.2.
Note
All ranges must be adjusted for gain for the calibration to be valid.
Timebase Adjustment
15. 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.
16. 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.
17. Call
DAQmxAdjustDSATimebaseCal
(DAQmx Adjust DSA Timebase Calibration VI)
with the following parameters to perform the timebase adjustment:
calHandle
:
myCalHandle
referenceFrequency
:
90000.0
