User`s guide

14 Utilities
394 InfiniiVision Oscilloscopes User’s Guide
User Calibration
Perform user-calibration:
• Each year or after 2000 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. Disconnect all inputs and allow the
oscilloscope to warm up before performing this procedure.
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 Agilent InfiniiVision Oscilloscopes Service Guide using
traceable sources.
To perform User Cal
1 Set the rear-panel CALIBRATION switch to UNPROTECTED.
2 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 50 RG58AU or equivalent BNC cables when performing User Cal.