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NI 5122/5124 Calibration Procedure
18
ni.com
Vertical Gain Accuracy
To verify vertical gain accuracy, complete steps 1 through 11 for each of
the 39 configuration iterations in Table 3.
1.
Call
niScope_ConfigureChanCharacteristics
(niScope
Configure Chan Characteristics VI) with the following parameters:
•
channelList
:
"0"
•
inputImpedance
: The Input Impedance value for the current
iteration from Table 3
•
maxInputFrequency
: The Maximum Input Frequency value for
the current iteration from Table 3
2.
Call
niScope_ConfigureVertical
(niScope Configure
Vertical VI) with the following parameters:
•
channelList
:
"0"
•
range
: The Range value for the current iteration from Table 3
•
offset
:
0.0
•
coupling
:
NISCOPE_VAL_DC
•
probeAttenuation
:
1.0
•
enabled
:
NISCOPE_VAL_TRUE
3.
Call
niScope_ConfigureHorizontalTiming
(niScope Configure
Horizontal Timing VI) with the following parameters:
•
minSampleRate
:
10,000,000
•
minNumPts
:
100,000
•
refPosition
:
50.0
•
numRecords
:
1
•
enforceRealtime
:
NISCOPE_VAL_TRUE
4.
Call
niScope_Commit
(niScope Commit VI) with the following
parameter:
•
vi
: The instrument handle you obtained from
niScope_init
5.
Connect the calibrator test head directly to the channel 0 input of the
digitizer and output the positive voltage from Table 6 (NI 5122) or
Table 7 (NI 5124) that corresponds to the vertical range used. Be sure
to configure the load impedance of the calibrator to match the input
impedance of the digitizer.
6.
Wait 2,500 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