AO Waveform Calibration Procedure for NI-DAQmx
4
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Test Equipment
Figure 1 shows the test equipment you need to calibrate your device. The
specific DMM, calibrator, and counter connections are described in the
Figure 1.
Calibration Connections
When performing calibration, National Instruments recommends that you
use the following instruments for calibrating an AO device:
•
Calibrator—Fluke 5700A. If that instrument is unavailable, use a
high-precision voltage source that is at least 50 ppm accurate for
12- and 13-bit boards and 10 ppm for 16-bit boards.
•
DMM—NI 4070. If that instrument is unavailable, use a multi-ranging
5.5-digit DMM with an accuracy of 40 ppm (0.004%).
•
Counter—Hewlett-Packard 53131A. If that instrument is unavailable,
use a counter accurate to 0.01%.
•
Low thermal copper EMF plug-in cables—Fluke 5440A-7002. Do not
use standard banana cables.
•
DAQ cable—NI recommends using shielded cables, such as the
SH68-68-EP with the NI 671
X
/673
X
or the SH68-C68-S with the
NI 672
X
.
HI
LO
Calibrator
HI
LO
DMM
Counter
AO Device
Shielded Cable
Accessory
CTR 0 OUT
AO GND
AO
x
AO GND
AO EXT REF
