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National Instruments Corporation
5
NI 9205/9206 Calibration Procedure
Calibration Requirements
Password
The default password for password-protected operations is
NI
.
Test Equipment
National Instruments recommends that you use the following equipment
for calibrating the NI 9205/9206:
•
Fluke 5700A calibrator. If that instrument is unavailable, use a
high-precision voltage source with an accuracy of at least 10 ppm.
•
NI cDAQ-9172 chassis.
Test Conditions
Follow these guidelines to optimize the connections and the environment:
•
Keep connections to the device as short as possible. Long cables and
wires act as antennae, picking up extra noise that can affect
measurements.
•
Use shielded copper wire for all cable connections to the device.
Use twisted-pair wire to eliminate noise and thermal offsets.
•
Maintain an ambient temperature of 23 ±10 °C. The device
temperature will be greater than the ambient temperature.
•
Keep relative humidity below 80%.
•
Allow a warm-up time of at least 10 minutes to ensure that the
measurement circuitry is at a stable operating temperature.
Calibration Process
This section provides instructions for verifying and adjusting the
NI 9205/9206.
Calibration Process Overview
The calibration process consists of the following steps:
1.
Initial Setup
—Configure the device in NI-DAQmx.
2.
Self-Calibration
—Measure the onboard reference voltage of the
device and adjust the self-calibration constants.
3.
Verification Procedure
—Verify the existing operation of the device.
This step confirms whether the device was operating within its
specified range prior to calibration.