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Calibration Procedures
The calibration process includes the following steps:
1.
Initial Setup—Install the device and configure it in Measurement & Automation Explorer
(MAX).
2.
Self-Calibration—Adjust the self-calibration constants of the device.
3.
Verification—Verify the existing operation of the device. This step confirms whether the
device is operating within its specified range prior to calibration.
4.
Adjustment—Perform an external adjustment of the device that adjusts the calibration
constants with respect to a known voltage source. The adjustment procedure automatically
stores the calibration date on the EEPROM to allow traceability.
5.
Reverification—Repeat the verification procedure to ensure that the device is operating
within its specifications after adjustment.
These steps are described in more detail in the following sections.
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 BNC of the device, or use a
short 50 Ω BNC coaxial cable if necessary. Long cables and wires act as antennas, picking
up extra noise that can affect measurements.
•
Keep relative humidity between 10 and 90% non-condensing, or consult the device
hardware documentation 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 5114 is at a stable operating temperature.
•
Plug the PXI/PXI Express chassis or PC and the calibrator into the same power strip to
avoid ground loops.
•
Ensure that the PXI/PXI Express chassis fan speed is set to HIGH, the fan filters
(PXI/PXIe)
are removed, and the empty slots contain PXI chassis slot blockers and 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.
.
NI 5114 Calibration Procedure | © National Instruments | 5
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