NI 9229/9239 Calibration Procedure | © National Instruments | 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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