©
National Instruments Corporation
3
NI 6711/6713/6731/6733 Calibration Procedure
Equipment and Other Test Requirements
This section describes the equipment, test conditions, documentation,
and software you need to calibrate the NI 6711/6713/6731/6733.
Test Equipment
To calibrate the NI 6711/6713/6731/6733, you need a high-precision
DMM that is at least 10 ppm (0.001%) accurate. NI recommends that you
use the Agilent 3458A DMM for calibration.
If you do not have an Agilent 3458A DMM, use the accuracy specifications
to select a substitute calibration standard.
If you do not have custom connection hardware, you may need a connector
block such as the NI CB-68 and a cable such as the SH6868-D1. These
components give you easy access to the individual pins on the 68-pin
I/O connector.
Test Conditions
Follow these guidelines to optimize connections and test conditions during
calibration:
•
Keep connections to the NI 6711/6713/6731/6733 short. Long cables
and wires act as antennae, picking up extra noise, which can affect
measurements.
•
Use shielded copper wire for all cable connections to the device.
•
Use twisted-pair wire to eliminate noise and thermal offsets.
•
Maintain a temperature between 18 and 28 °C. To operate the module
at a specific temperature outside this range, calibrate the device at that
temperature.
•
Keep relative humidity below 80%.
•
Allow a warm-up time of at least 15 minutes to ensure that the
measurement circuitry is at a stable operating temperature.
Software
Because the NI 6711/6713/6731/6733 is a PC-based measurement device,
you must have the proper device driver installed in the calibration system
before attempting calibration. For this calibration procedure, you need
NI-DAQ version 6.9.2 or earlier installed on the calibration computer.
NI-DAQ, which configures and controls the NI 6711/6713/6731/6733,
is available at
ni.com/downloads
.
