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NI 6738/6739 Calibration Procedure
Adjustment
The following procedure adjusts the analog output of your NI 6738/6739.
At the end of each calibration procedure, these new constants are stored in the external
calibration area of the EEPROM. These values are password-protected, which prevents the
accidental access or modification of any calibration constants adjusted by the metrology
laboratory. The default password is
NI
.
Complete the following steps to perform device analog adjustment with a DMM.
Note
If your DMM has a self-calibration routine, self-calibrate the device before
performing AO adjustment.
1.
Connect the DMM to AO 0 as shown in Table 5,
Note
If you are using the NI 4070, ensure that it is set to the 10 V range.
2.
Call
DAQmxCreateAOVoltageChan
with the following parameters:
•
taskHandle
:
taskHandle
•
physicalChannel
:
Dev_name/ao0
•
nameToAssignToChannel
:
AOVoltageChannel
•
minVal
:
-10.0
•
maxVal
:
10.0
•
units
:
DAQmx_Val_Volts
•
customScaleName
:
NULL
Note
Throughout the procedure, refer to the NI-DAQmx function call parameters
for the LabVIEW input values.
3.
Call
DAQmxStartTask
with the following parameter using Table 7,
•
taskHandle
:
taskHandle
4.
Call
DAQmxWriteAnalogF64
with the following parameters, using
7.5
for
data
:
•
taskHandle
:
taskHandle
•
numSampsPerChan
:
1
•
autoStart
:
1
•
timeout
:
10.0
•
dataLayout
:
DAQmx_Val_GroupByChannel
•
writeArray
:
&data
•
sampsPerChanWritten
:
&samplesWritten
•
reserved
:
NULL
Summary of Contents for NI 6738
Page 1: ...PXIe 6738...
