Test Conditions; Initial Setup - National Instruments C Series Calibration Procedure

Equipment
Calibrator
Chassis
DSUB Connection
1
Accessory

Test Conditions

The following setup and environmental conditions are required to ensure the device 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 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.
• Keep relative humidity below 80%.
• Allow a warm-up time of at least 10 minutes to ensure that the device measurement
circuitry is at a stable operating temperature.

Initial Setup

Complete the following steps to set up the NI 9202.
1. Install NI-DAQmx.
2. Make sure that the cDAQ-9178 power source is not connected to the chassis.
3. Connect the 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 cDAQ-9178 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 cDAQ-9178 chassis. Leave slots 1 through 7 of the
cDAQ-9178 chassis empty.
1
For NI 9202 with DSUB variant
Table 1. Recommended Equipment
Recommended Model
Fluke 5500A
cDAQ-9178 (part number
781156-01)
NI 9923 (part number
781503-01)
NI 9202 Calibration Procedure | © National Instruments Corporation | 3
Requirements
Use a high-precision voltage source
with a gain error of <57 ppm and an
offset error of <2 mV.
—
—