NI 5122/5124/5142 Calibration Procedure
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© National Instruments
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39
Adjustment
If the NI 5122/5124/5142 successfully passed each of the verification procedures within the
calibration test limits, then an adjustment is recommended but not required to guarantee its
published specifications for the next two years. If the digitizer was not within the calibration test
limits for each of the verification procedures, you can perform the adjustment procedure to
improve the accuracy of the digitizer. Refer to
Appendix A: Calibration Options
to determine
which procedures to perform.
An adjustment is required only once every two years. Following the adjustment procedure
automatically updates the calibration date and temperature in the EEPROM of the digitizer.
Note
If the digitizer passed the entire verification procedure within the calibration
test limits and you do not want to perform an adjustment, you can update the
calibration date and onboard calibration temperature without making any
adjustments by completing
only
steps 2 and 12 in this section.
Complete all of the following steps to externally adjust the NI 5122/5124/5142.
1.
Connect the scope calibrator test head directly to the channel 1 input of the digitizer.
Configure the calibrator to output an exact 4 V DC signal into a 1 M
Ω
load impedance.
2.
Obtain an instrument session handle using the niScope Cal Start VI.
3.
Wait 2,500 ms for the impedance matching and frequency of the calibrator to settle.
4.
Adjust the vertical range using the niScope Cal Adjust Range VI.
LabVIEW VI
C/C++ Function Call
Call
niScope_CalStart
with
the following parameters:
resourceName
: The name of the
device to calibrate. You can find
this name under Devices and
Interfaces in MAX.
password
: The password required
to open an external calibration
session. If this password has not
been changed since
manufacturing, the password is
"
NI
".
