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NI VirtualBench Calibration Procedure
To adjust the FGEN accuracy complete the following steps.
1.
Connect the voltage input HI and LO terminals of the DMM to the FGEN BNC using a
banana plug-to-BNC cable—observing the polarity of the banana plugs—as shown in
Figure 28.
Figure 28.
Cable Connections for FGEN Verification and Adjustment
2.
Call
FGEN Initialize Calibration
with the following parameter:
•
Password
=
NI
(default)
3.
Call
FGEN Setup Offset Calibration
with the following parameter:
•
Enable Filter
=
TRUE
4.
Wait 100 milliseconds.
5.
Perform a measurement with the DMM in the 1 V range. Record the reference value
measurement.
6.
Call
FGEN Adjust Offset Calibration
with the following parameter:
•
Reference Value
—Supplied from measurement in step 5
7.
Repeat steps 3 through 6 until
FGEN Adjust Offset Calibration
returns
TRUE
from its Calibration Done output.
8.
Repeat steps 3 through 7 with the following parameter:
•
Enable Filter
=
FALSE
9.
Call
FGEN Get Gain Calibration Adjustment Points
. This will return
two arrays:
•
Enable Filter
—A Boolean array of filter settings
•
Adjustment Point
—An array of voltage points used in the gain adjustment steps
1
VirtualBench FGEN
2
DMM
3
Banana Plug-to-BNC Cable
HI
LO
3
00V
MAX
AMP
S
500V MAX
HI
LO
1kV
MAX
3
A, 250V
MAX
INPUT
MAX
1kV
1
3
2