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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
Recommended
Equipment
Calibrator
Function
Generator
Chassis
Test Conditions
The following setup and environmental conditions are required to ensure the NI 9225 meets
published specifications.
•
Keep connections to the NI 9225 as short as possible. Long cables and wires act as
antennas, picking up extra noise that can affect measurements.
•
Use shielded copper wire for all cable connections to the NI 9225. Use twisted-pairs wire
to eliminate noise and thermal offsets.
•
Maintain an ambient temperature of 23 °C ±5 °C. The NI 9225 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 NI 9225 measurement
circuitry is at a stable operating temperature.
Table 1. Recommended Equipment
Model
Fluke 5500A
NI 4461
NI cDAQ-9178
NI 9225 Calibration Procedure | © National Instruments | 3
Where Used
Accuracy,
Adjustment
Gain Matching,
Phase Matching
All
Requirements
Use a high-precision voltage
source with an accuracy
≤100 ppm.
Use a function generator capable
of sourcing both 1 kHz and
20 kHz ±10 V
AC sinusoidal
pk
signals with amplitude
uncertainty of ±10%.
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