NI VirtualBench Calibration Procedure | © National Instruments | 49
FGEN Initial Setup
Note This section is necessary for pre-adjustment verifications only. If you are
performing a post-adjustment verification, skip the setup and go directly to the
Verifying the FGEN Offset section.
To set up the test equipment, complete the following steps.
1. If VirtualBench is running, shut down all instruments on the VirtualBench, and close the
VirtualBench software. Remove all signal connections.
2. Verify that the DMM has been calibrated within the proper calibration interval specified in
its specifications, and a self-calibration is performed.
Note Ensure that the VirtualBench is warmed up for at least 30 minutes and the
DMM is warmed up for the minimum time required as specified in its user
documentation.
FGEN Verification
You can use the verification procedure described in this section for both pre-adjustment and
post-adjustment verification.
Verifying the FGEN Offset
Complete the following steps to verify the VirtualBench FGEN offset.
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 27.
Figure 27. Cable Connections for FGEN Verification and Adjustment
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
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