Advertisement
Test Equipment
Table 1 lists the equipment recommended for the performance verification and adjustment
procedures. If the recommended equipment is not available, select a substitute using the
requirements listed in Table 1.
Equipment
Calibrator
Chassis
DSUB Connection
Accessory
Test Conditions
The following setup and environmental conditions are required to ensure the NI 9220 meets
published specifications.
•
Keep connections to the NI 9220 as short as possible. Long cables and wires act as
antennae, picking up extra noise that can affect measurements.
•
Verify that all connections to the NI 9220 are secure.
•
Use shielded copper wire for all cable connections to the NI 9220. Use twisted-pairs wire
to eliminate noise and thermal offsets.
•
Maintain an ambient temperature of 23 °C ±5 °C.
•
Keep relative humidity below 80%.
•
Allow a warm-up time of at least 10 minutes to ensure that the NI 9220 measurement
circuitry is at a stable operating temperature.
Initial Setup
Complete the following steps to set up the NI 9220.
1.
Install NI-DAQmx.
2.
Make sure the NI cDAQ-9178 power source is not connected.
3.
Install the module in slot 8 of the NI cDAQ-9178 chassis. Leave slots 1 through 7 of the
NI cDAQ-9178 chassis empty.
4.
Connect the NI cDAQ-9178 chassis to your host computer.
5.
Connect the power source to the NI cDAQ-9178 chassis.
Table 1. Recommended Equipment
Recommended
Model
Fluke 5700A
NI cDAQ-9178
NI 9923
NI 9220 Calibration Procedure | © National Instruments Corporation | 3
Requirements
Use a high-precision voltage source with an
accuracy of ≤15 ppm and an output impedance
of ≤50 Ω.
—
—
Advertisement
