Technical data

Calibrating and Adjusting 3
7000 Series Oscilloscopes Service Guide 61
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 procedures in
Chapter 2 in this book 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.
7000 service guide.book Page 61 Thursday, October 16, 2008 12:18 PM