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NI PXIe-5694 Calibration Procedure
Test Conditions
The following setup and environmental conditions are required to ensure the NI 5694 meets
published specifications.
•
Keep cabling as short as possible. Long cables and wires act as antennas, picking up extra
noise that can affect measurements.
•
Verify that all connections, including front panel connections and screws, are secure.
•
Maintain an ambient temperature of 23 °C ±5 °C.
•
Keep relative humidity between 10% and 90%, noncondensing.
•
Allow a warm-up time of at least 30 minutes after the chassis is powered on and NI-RFSA
is loaded and recognizes the NI 5694. The warm-up time ensures that the NI 5694 and test
instrumentation are at stable operating temperature.
•
In each verification procedure, insert a delay between configuring all devices and acquiring
the measurement. This delay may need to be adjusted depending on the instruments used
but should always be at least 1,000 ms for the first iteration, 1,000 ms when the power level
changes, and 100 ms for each other iteration.
•
Plug the PXI Express chassis and the calibrator into the same power strip to avoid ground
loops.
•
Use a torque wrench appropriate for the type of RF connector that you are using.
NI recommends a 0.565 N · m (5 lb · in.) wrench for SMA connectors and a 0.90 N · m
(8 lb · in.) wrench for 3.5 mm connectors.
•
Ensure that the PXI Express chassis fan speed is set to HIGH, that the fan filters, if present,
are clean, and that the empty slots contain filler panels. For more information, refer to the
Maintain Forced-Air Cooling Note to Users
document, available at
ni.com/manuals
.
Initial Setup
Refer to the
NI 5694 Getting Started Guide
for information about how to install the NI-RFSA
software, the NI 5694 hardware, and how to configure the NI 5694 in Measurement &
Automation Explorer (MAX).
As-Found and As-Left Limits
The as-found limits are the published specifications for the NI 5694. NI uses these limits to
determine whether the NI 5694 meets the device specifications when it is received for
calibration.
The as-left limits are equal to the published NI specifications for the NI 5694, less guard bands
for measurement uncertainty, temperature drift, and drift over time. NI uses these limits to
reduce the probability that the instrument is no longer calibrated at the end of the calibration
cycle.
