Keysight Technologies DSO-X 2002A, User Manual

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258 Keysight InfiniiVision 2000 X-Series Oscilloscopes User's Guide
20
Utility Settings
• Every two years or after 4000 hours of operation.
• If the ambient temperature is >10° C from the calibration temperature.
• If you want to maximize the measurement accuracy.
The amount of use, environmental conditions, and experience with other
instruments help determine if you need shorter User Cal intervals.
User Cal performs an internal self-alignment routine to optimize the signal path in
the oscilloscope. The routine uses internally generated signals to optimize circuits
that affect channel sensitivity, offset, and trigger parameters.
Performing User Cal will invalidate your Certificate of Calibration. If NIST (National
Institute of Standards and Technology) traceability is required, perform the
"Performance Verification" procedure in the Keysight InfiniiVision
2000/3000 X-Series Oscilloscopes Service Guide using traceable sources.
To perform user calibration:
1 Disconnect all inputs from the front and rear panels, including the digital
channels cable on an MSO, and allow the oscilloscope to warm up before
performing this procedure.
2 Press the rear-panel CAL button to disable calibration protection.
3 Connect short (12 inch maximum) equal length cables to each analog channel's
BNC connector on the front of the oscilloscope. You will need two equal-length
cables for a 2-channel oscilloscope or four equal-length cables for a 4-channel
oscilloscope.
Use 50W RG58AU or equivalent BNC cables when performing User Cal.
For a 2-channel oscilloscope, connect a BNC tee to the equal length cables.
Then connect a BNC(f)-to-BNC(f) (also called a barrel connector) to the tee as
shown below.