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National Instruments Corporation
11
SCXI-1125 Calibration Procedure
Complete the following steps to adjust the gain and offset of the
SCXI-1125:
1.
Connect the DMM to AO 0+ and AO 0- (pin 3 and 4) on the rear
connector. Refer to Table 5 for rear signal pin assignments of the
SCXI-1125.
Note
You can access these pins using a 50-pin cable connected to an SCXI-1349.
2.
Connect the calibration output to pins AI- and AI+ for all channels.
Refer to the
SCXI-1320 High-Voltage Terminal Block Installation
Guide and Specifications
for connection instructions. If you are not
using the recommended SCXI-1320, refer to Table 4 for the front
signal pin assignments of the SCXI-1125. If the calibration signal
source is floating, connect AI- to the SCXI chassis ground using the
ground lug available on the SCXI terminal block.
3.
Start an external calibration session using the DAQmx Initialize
External Calibration VI.
Note
Throughout the adjustment procedure, refer to the function call parameters for the
LabVIEW input values.
4.
Set the SCXI-1125 to a gain value listed in Table 3 using the DAQmx
Setup SCXI Calibration VI.
LabVIEW Block Diagram
NI-DAQmx Function Call
Call
DAQmxInitExtCal
with the following
parameters:
deviceName
:
"SC1Mod1"
password
:
"NI"
calHandle
:
&calHandle
LabVIEW Block Diagram
NI-DAQmx Function Call
Call
DAQmxSetup1125Cal
with the following
parameters:
calHandle
:
calHandle
channelNames
:
"SC1Mod1/ai
X
"
†
gain
:
(gain value found in Table 3)
float64
†
Where
X
refers to the channel you are calibrating.
