NI 9229/9239 Calibration Procedure
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© National Instruments
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3
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.
Test Conditions
The following setup and environmental conditions are required to ensure the NI 9229/9239
meets published specifications.
•
Keep connections to the device 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 9229/9239 are secure.
•
(NI 9229/9239 with screw-terminal)
Use shielded copper wire for all cable connections
to the device.
•
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 9229/9239 measurement
circuitry is at a stable operating temperature.
Initial Setup
Complete the following steps to set up the NI 9229/9239.
1.
Install the NI-DAQmx driver software.
2.
Make sure the NI cDAQ-9178 power source is not connected.
Table 1.
Recommended Equipment
Equipment
Recommended
Model
Parameter
Measured
Requirements
Calibrator
Fluke 5700A
Accuracy,
Adjustment
Use a high-precision voltage source
with an accuracy
≤
100 ppm and an
output impedance
≤
50
Ω
.
Function
Generator
NI 4461
Gain Matching,
Phase Matching
Use a function generator capable of
sourcing both 1 kHz and 20 kHz
±10 V
pk
AC sinusoidal signals with
amplitude uncertainty of ±10%.
Chassis
NI cDAQ-9178
All
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