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NI VirtualBench Calibration Procedure
Oscilloscope Test Conditions
Follow these guidelines to optimize the equipment and the environment during calibration:
•
Keep connections to the device as short as possible. Long cables and wires act as antennae,
picking up noise that can affect measurements.
•
Use a USB connection between the PC and VirtualBench.
•
Verify that all connections to the device, including front panel connections, are secure.
•
Keep relative humidity between 10% and 80% noncondensing.
•
Allow a warm up time of at least 30 minutes to ensure that the VirtualBench is at a stable
operating temperature.
•
Plug the VirtualBench, PC, and the test equipment into the same power strip to avoid
ground loops.
•
Verification limits are defined assuming the same test equipment is used during verification
and adjustment.
•
Maintain an ambient temperature of 23 ±5 °C. The device temperature will be greater than
the ambient temperature.
Oscilloscope 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
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 oscilloscope calibrator has been calibrated within the time limits specified
in its specifications, and that a self-calibration has been performed before VirtualBench
calibration. Consult the oscilloscope calibrator user documentation for instructions on
calibrating these devices.
Function generator
NI 5421
Must be able to generate a 1 kHz square
wave between 36 mV
pp
and 18 V
pp
with
less than 200 ns rise time and less than 5%
overshoot.
SMB to BNC cable
NI part number
778827-01
Cable needed to connect from the function
generator to the VirtualBench BNC
connectors.
Table 12.
Recommended Equipment (Continued)
Equipment
Recommended
Model
Minimum Requirements