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NI 5105 Calibration Procedure
Note
In some cases, the complete calibration procedure may not be required. Refer
to
for more information.
Initial Setup
Refer to the
NI High-Speed Digitizers Getting Started Guide
for information about how to install
the software and hardware, and how to configure the device in MAX.
Test Conditions
Follow these guidelines to optimize the connections and the environment during calibration:
•
Always connect the calibrator test head directly to the input SMB of the device using the
BNC to SMB adapter. Long cables and wires act as antennas, picking up extra noise that
can affect measurements.
Note
Make sure the calibration test head has mechanical support to prevent
unnecessary strain on the SMB connector of the device.
•
Keep relative humidity between 10 and 90% non-condensing, or consult the device
hardware specifications for the optimum relative humidity.
•
Maintain an ambient temperature of 23 ±5 °C. The device temperature will be greater than
the ambient temperature.
•
Allow a warm-up time of at least 15 minutes after the NI-SCOPE driver is loaded. Unless
manually disabled, the NI-SCOPE driver automatically loads with the operating system and
enables the device. The warm-up time ensures that the measurement circuitry of the
NI 5105 is at a stable operating temperature.
•
Plug the PXI chassis or PC and the calibrator into the same power strip to avoid ground
loops.
•
(PXI/PXIe)
Ensure that the PXI chassis fan speed is set to HIGH, 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
document available at
ni.com/manuals
.
•
Verify that all connections to the device, including front panel connections, are secure.
•
Use shielded copper wire for all cable connections to the device. Use twisted-pair wire to
eliminate noise and thermal offsets.
Adjust the Digital Clock Manager (DCM)
Adjusting the digital clock manager for the NI 5105 is required in the calibration procedure.
NI recommends that you adjust the DCM at least once every two years, regardless of whether
you choose to perform a verification or adjustment of the device. Completing this procedure
does not affect the measurements in offset, gain, timing, or bandwidth verification sections
described later in this document.
Caution
Failing to adjust the DCM at least once every two years can result in
invalid measurements from the NI 5105.
