NI 5421, Процедура калибровки

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NI 5421/5441 Calibration Procedure | © National Instruments | 27
11. Create an array of waveform samples. Each waveform should have samples and cycles that
correspond to the current iteration in Table 8.
12. (LabVIEW Only) You must call the Sine Pattern VI to create the array of waveform
samples for step 11. Specify an amplitude of
0.5
, and samples and cycles that correspond
to the current iteration in Table 8. Wire the Sinusoidal Pattern output of the Sine Pattern
VI to the Waveform Data Array input of the niFgen Create Waveform (DBL) VI in
step 13.
13. 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 of the waveform that you created in step 11 or step 12
• wfmArray : The array of waveform samples that you created in step 11 or step 12
(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.
14. Call
niFgen_SetAttributeViInt32
(NI-FGEN Arbitrary Waveform Handle
property) using the following parameters:
•
vi : The session handle returned from
niFgen_init
• channelName :
"0"
• attributeID :
NIFGEN_ATTR_ARB_WAVEFORM_HANDLE
• value : The wfmHandle from step 13
a. Call
niFgen_SetAttributeViBoolean
to set the digital filter state (NI-FGEN
Digital Filter Enabled property) using the following parameters:
•
vi : The session handle returned from
niFgen_InitExtCal
• channelName :
"0"
• attributeID :
NIFGEN_ATTR_DIGITAL_FILTER_ENABLED
• value :
VI_TRUE
7 20 MHz 1,000 200 -1.0 dB to
+0.5 dB
-1.2 dB to
+0.5 dB
8 43 MHz 1,000 430 -3.0 dB to
+0.5 dB
-3.0 dB to
+0.5 dB
Table 8. NI 5421/5441 Setup for Main Analog Path Flatness Verification (Continued)
Iteration Frequency
Number of
Samples
Number of
Cycles
Published Specification
Low-Gain
Amplifier
High-Gain
Amplifier