Test Conditions
The following setup and environmental conditions are required to ensure the device meets
published specifications.
•
Keep connections to the device as short as possible. Long cables and wires act as
antennas, picking up extra noise that can affect measurements.
•
Use shielded copper wire for all cable connections to the device. Use twisted-pairs wire
to eliminate noise and thermal offsets.
•
Maintain an ambient temperature of 23 °C ± 5 °C. The device temperature will be greater
than the ambient temperature.
•
Keep relative humidity below 80% .
•
Allow a warm-up time of at least 15 minutes to ensure that the device measurement
circuitry is at a stable operating temperature.
Initial Setup
Refer to your getting started guide for your device for information about how to install the
software and hardware.
Note
You can access all of the NI R Series VIs for calibration at
<labview>
\vi.lib\LabVIEW Targets\FPGA\RIO\R Series\78XXR\783XR
\Calibration\Public
.
Self-Calibration
Complete the following steps to self-calibrate the device.
Note
No signal connections are needed for self-calibration.
1.
Wait 15 minutes for the device to warm-up.
2.
Launch the self-calibration VI
nirio78xxCalibrationSelfCal.vi
.
3.
Call self-calibration before doing the first verification.
4.
Pass a TRUE to
Save Cal Results
to save the constants to the user portion of the
flash memory. If you pass False, the constants are then discarded.
As-Found and As-Left Limits
The as-found (1-Year) limits are the published specifications for the NI PXIe-7865/7866. NI
uses these limits to determine whether the NI PXIe-7865/7866 meets the specifications when it
is received for calibration. Use the as-found limits during initial verification.
The as-left (24-Hour) calibration limits are equal to the published NI specifications for the NI
PXIe-7865/7866, less guard bands for measurement uncertainty, temperature drift, and drift
NI PXIe-7865 and NI PXIe-7866 Calibration Procedure
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© National Instruments
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