NI 5922 Calibration Procedure
16
ni.com
•
refPosition
:
50.0
•
numRecords
:
1
•
enforceRealtime
:
NISCOPE_VAL_TRUE
5.
Call
niScope_InitiateAcquisition
. (niScope Initiate
Acquisition VI) with the following parameter:
•
vi
: The instrument handle you obtained from
niScope_init
6.
Call
niScope_FetchMeasurement
(niScope Fetch
Measurement VI) with the following parameters:
•
channelList
:
"0"
•
timeout
:
1.0
•
scalarMeasFunction
:
NISCOPE_VAL_DC_ESTIMATE
7.
Call
niScope_ConfigureChanCharacteristics
(niScope Configure Chan Characteristics VI) with the following
parameters:
•
channelList
:
"0"
•
inputImpedance
:
NISCOPE_VAL_1_MEG_OHM
•
maxInputFrequency
:
0
8.
Call
niScope_InitiateAcquisition
(niScope Initiate
Acquisition VI) with the following parameter:
•
vi
: The instrument handle you obtained from
niScope_init
9.
Call
niScope_FetchMeasurement
(niScope Fetch
Measurement VI) with the following parameters:
•
channelList
:
"0"
•
timeout
:
1.0
•
scalarMeasFunction
:
NISCOPE_VAL_DC_ESTIMATE
10. Calculate the bias current using the following formula:
where
a
= the voltage measured in step 6
b
= the voltage measured in step 9
1,000,000 is the NI 5922 impedance in ohms
Compare the resulting bias current to the value listed in the
Calibration
Test Limits
column or the
Published Specifications
column in Table 5.
If the result is less than the selected test limit, the device has passed this
portion of the verification.
Bias Current
a b
–
1,000,000
------------------------
=
