National Instruments 5412, Процедура калибровки

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NI 5412 Calibration Procedure
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© National Instruments
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7. Call
niFgen_CreateWaveformF64
(niFgen Create Waveform (DBL) VI) using the
following parameters:
•
vi : The session handle returned from
niFgen_init
• channelName :
"0"
• wfmSize : The size in samples (
2000
) of the waveform.
• wfmData : The array of waveform samples (double representation).
• wfmHandle : A pointer to a waveform. The variable passed by reference through this
parameter acts as a handle to the waveform and can be used for setting the active
waveform, changing the data in the waveform, building sequences of waveforms, or
deleting the waveform when it is no longer needed.
Note
In LabVIEW, you must call the niFgen Util Create Waveform Data VI to
generate a single cycle sine wave with 2,000 samples and an amplitude of 1. Wire the
output of the niFgen Util Create Waveform Data VI to the Waveform Data Array
input of the niFgen Create Waveform (DBL) VI.
8. Configure the DMM using the following settings:
• Function: AC voltage
• Range: Refer to Table 6
• Input impedance: 1 MΩ
• Average readings: 4
• Digits: 6.5
Note
These values assume you are using an NI 4070 DMM. For other DMMs, use
the range closest to the values listed in step 8. The input impedance should be equal
to or greater than the values indicated in Table 2, Equipment Required for Calibrating
the NI 5412 .
9. Repeat steps 10 through 15 for each of the 24 iterations listed in Table 6, changing the Gain
and DMM Range (VRMS) values for each iteration.
Table 6.
Values for Verifying the AC Voltage Amplitude Absolute Accuracy
Iteration Gain
DMM
Range
(VRMS)
Expected
Amplitude
(VRMS)
Test Limit
(-VRMS)
Test Limit
(+VRMS)
1 12.000000 50 8.485281 -0.085560 0.170413
2 10.000000 50 7.071068 -0.0714178 0.142128
3 7.000000 5 4.949747 -0.050205 0.099702
4 5.000000 5 3.535534 -0.036062 0.071418
5 3.500000 5 2.474874 -0.025456 0.050205