National Instruments VirtualBench - Page 52

52 | ni.com | 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 2DMM 3 Banana Plug-to-BNC Cable
HI
LO
300V
MAX
AMPS
500V MAX
HI
LO
1kV
MAX
3A, 250V
MAX
INPUT
MAX
1kV
1
3
2