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National Instruments Corporation
25
NI 5122/5124 Calibration Procedure
digitizer. Configure the load impedance of the calibrator to match the
input impedance of the digitizer.
6.
Wait 1000 ms for the impedance matching of the calibrator to settle.
7.
Call
niScope_InitiateAcquisition
(niScope Initiate
Acquisition VI) with the following parameter:
•
vi
: The instrument handle you obtained from
niScope_init
8.
Call
niScope_FetchMeasurement
(niScope Fetch
Measurement VI) with the following parameters:
•
channelList
:
"0"
•
timeout
:
1.0
•
scalarMeasFunction
:
NISCOPE_VAL_VOLTAGE_RMS
9.
Call
niScope_ConfigureHorizontalTiming
(niScope Configure
Horizontal Timing VI) with the following parameters:
•
minSampleRate
:
100,000,000
(for NI 5122),
200,000,000
(for NI 5124)
•
minNumPts
:
300,000
•
refPosition
:
50.0
•
numRecords
:
1
•
enforceRealtime
:
NISCOPE_VAL_TRUE
10. Call
niScope_Commit
(niScope Commit VI) with the following
parameter:
•
vi
: The instrument handle you obtained from
niScope_init
11. Wait 500 ms for the output of the calibrator to settle.
12. Repeat steps 12a through 12d for each Input Frequency listed for the
current iteration in Table 10 (NI 5122) or Table 11 (NI 5124).
a.
Configure the calibrator to output the Input Frequency for the
current iteration from Table 10 (NI 5122) or Table 11 (NI 5124).
b.
Call
niScope_InitiateAcquisition
(niScope Initiate
Acquisition VI) with the following parameter:
•
vi
: The instrument handle you obtained from
niScope_init
c.
Call
niScope_FetchMeasurement
(niScope Fetch
Measurement VI) with the following parameters:
•
channelList
:
"0"
•
timeout
:
1.0
•
scalarMeasFunction
:
NISCOPE_VAL_VOLTAGE_RMS