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NI PXIe-4154 Calibration Procedure
Test Conditions
The following setup and environmental conditions are required to ensure NI PXIe-4154 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.
•
Verify that all connections to the device, including front panel connections, are secure.
•
Ensure that the PXI/PXI Express chassis fan speed is set to HI, that the fan filters are clean,
and that the empty slots contain filler panels. For more information, refer to the
Maintain
Forced-Air Cooling Note to Users
at
ni.com/manuals
.
•
Keep relative humidity between 10% and 70%, noncondensing.
•
Allow a warm-up time of at least 30 minutes after the NI-DCPower driver is loaded. Unless
manually disabled, the NI-DCPower driver automatically loads with the operating system
and enables the device. Allow the recommended warm-up time for all additional test
equipment.
•
Perform all measurements using
Local Sense
unless otherwise noted.
•
Perform all measurements with the niDCPower Samples to Average property/attribute set
to
20000
.
•
Use characterized values in all instances where precision shunt resistance is measured.
•
Use shielded copper wire for all cable connections to the device. Use twisted-pair wire to
eliminate noise and thermal offsets. Use separate twisted-pair wires for , Output -,
Sense +, and Sense - pins. Refer to Figure 1 for a connection diagram.
Figure 1.
Twisted-Pair Connection
•
Plug the chassis and the instrument standard into the same power strip to avoid ground
loops.
Load
+
–
Sense –
Sense +
Twisted Pair
Shield
Output –
NI PXIe-4154
