NI cDAQ Chassis Calibration Procedure 2 ni.com
• NI cDAQ-9188 Ethernet Chassis Quick Start—This document explains how to install the
application and NI-DAQmx driver software, set up your NI cDAQ-9188 Ethernet chassis and
I/O modules, confirm the system is operating properly, and take your first measurement. You can
find this document at
ni.com/manuals.
Calibration Interval
National Instruments recommends a calibration interval of one year for the NI cDAQ chassis. Adjust the
recommended calibration interval based on the measurement accuracy demands of your application.
Test Equipment
National Instruments recommends that you use the equipment in Table 1 for calibrating an NI cDAQ
chassis.
Test Conditions
The following setup and environmental conditions are required to ensure the NI cDAQ chassis meets
published specifications.
• Keep connections to the C Series module as short as possible. Long cables and wires act as
antennae, picking up extra noise that can affect measurements.
• Maintain an ambient temperature of 23 ±5 °C. The device temperature will be greater than the
ambient temperature.
• Keep relative humidity below 90%.
• Allow a warm up time of at least 10 minutes to ensure that the measurement circuitry is at a stable
operating temperature.
Calibration Procedures
The calibration process includes the following steps:
1. Initial Setup—Install the device and configure it in Measurement & Automation Explorer (MAX).
2. Verification—Verify the existing operation of the device. This step confirms whether the device is
operating within the published specifications prior to adjustment.
3. Adjustment—If the device does not fall within the desired specifications, return the device to NI for
repair. Refer to Where to Go for Support for assistance in returning the chassis to NI.
4. Reverification—Repeat the verification procedure to ensure that the device is operating within the
published specifications after adjustment.
The first two procedures are described in more detail in the following sections.
Table 1. Recommended Equipment
Equipment Recommended Model Minimum Requirements
Counter Agilent 53131A If this instrument is unavailable, use a
counter accurate to ±5 ppm.
C Series Digital I/O Module NI 9401 or NI 9402 —
C Series Connection Accessory NI 9934 (NI 9401) 25-pin DSUB connector kit.
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