Agilent Technologies 7000B Series User Manual page 398

18 Oscilloscope Utility Settings
• 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 calibration:
1 Set the rear- panel CALIBRATION switch to UNPROTECTED.
2 Connect short (12 inch maximum) equal length cables to each analog
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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.
InfiniiVision 7000B Series Oscilloscopes User's Guide