Table 1. Recommended Equipment
Equipment Recommended Model
Requirements
Calibrator
Fluke 5730A
DC gain error <500 ppm, DC offset error <100 µV,
AC gain error <0.2%
Chassis
cDAQ-9178
—
Test Conditions
The following setup and environmental conditions are required to ensure the NI 9775 meets
published specifications.
•
Keep connections to the NI 9775 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 NI 9775 are secure.
•
Maintain an ambient temperature of 23 °C ± 5 °C.
•
Keep relative humidity below 80%.
•
Allow a warm-up time of at least 15 minutes to ensure that the NI 9775 measurement
circuitry is at a stable operating temperature.
Initial Setup
Complete the following steps to set up the NI 9775.
1.
Install NI-DAQmx.
2.
Make sure the cDAQ-9178 power source is not connected.
3.
Install the module in slot 8 of the cDAQ-9178 chassis. Leave slots 1 through 7 of the
cDAQ-9178 chassis empty.
4.
Connect the cDAQ-9178 chassis to your host computer.
5.
Connect the power source to the cDAQ-9178 chassis.
6.
Launch Measurement & Automation Explorer (MAX).
7.
Right-click the device name and select
Self-Test
to ensure that the module is working
properly.
Verification
The following performance verification procedure describes the sequence of operation and test
points required to verify the NI 9775 and assumes that adequate traceable uncertainties are
available for the calibration references.
AC Accuracy Verification
Complete the following procedure to determine the As-Found Status of AC Accuracy of the
NI 9775.
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NI 9775 Calibration Procedure