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National Instruments Corporation
9
NI 6110/6111/6115/6120 Calibration Procedure
3.
If the calibrator and computer are floating with respect to each other,
connect the negative output of the calibrator to the analog input
channel ground, as listed in Table 3.
4.
Refer to the
NI 6110/6111/6115/6120 Specifications
acceptable settings for the device. Although NI recommends that you
verify all ranges, you can save time by checking only the ranges your
application uses.
5.
Set the calibrator voltage to the test point value indicated in Table 5 for
the NI 6110/6111, Table 8 for the NI 6115, or Table 11 for the
NI 6120.
6.
Call
AI_Configure
to inform NI-DAQ of the input mode, input
range, and input polarity selected for the device. Set the following
parameters:
•
deviceNumber
—The value obtained from MAX
•
chan
—The channel currently being verified
•
inputMode
—
0
•
inputRange
—The range for calibration from Table 5 for the
NI 6110/6111, Table 8 for the NI 6115, or Table 11 for the
NI 6120
•
polarity
—
0
•
driveAIS
—
0
7.
Call
DAQ_Op
to acquire 1,000 points of voltage data. Set the following
parameters:
•
deviceNumber
—The value obtained from MAX
•
chan
—The channel currently being verified
•
gain
—The value specified by Table 5 for the NI 6110/6111,
Table 8 for the NI 6115, or Table 11 for the NI 6120
•
buffer
—Array of conversion samples returned
•
count
—
1,000
•
sampleRate
—
20,000
Table 3.
Channel Ground Connections
Channel Ground
Analog Input
ACH0GND
67
ACH1GND
32
ACH2GND
64
ACH3GND
29