NI 9246/9247 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 9246/9247
meets published specifications.
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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 device are secure.
•
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. The device 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 9246/9247 measurement
circuitry is at a stable operating temperature.
Initial Setup
Complete the following steps to set up the NI 9246/9247.
1.
Install NI-DAQmx.
2.
Make sure the NI cDAQ-9178 power source is not connected to the chassis.
3.
Connect the NI cDAQ-9178 chassis to the system safety ground.
a.
Attach a ring lug to a 14 AWG (1.6 mm) wire.
b.
Connect the ring lug to the ground terminal on the side of the NI cDAQ-9178 chassis
using the ground screw.
c.
Attach the other end of the wire to the system safety ground.
4.
Install the module in slot 8 of the NI cDAQ-9178 chassis. Leave slots 1 through 7 of the
NI cDAQ-9178 chassis empty.
Table 1.
Recommended Equipment
Equipment
Recommended
Model
Parameter
Measured
Requirements
Source
Fluke 5522A
Accuracy,
Adjustment
Use a high-precision current
source with an accuracy
≤
650 ppm
cDAQ Chassis
NI cDAQ-9178
All
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