4-7
Calibrating and Adjusting
To peform User Cal
To peform User Cal
Perform self-calibration:
• every 6 months or after 1000 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 adjustment 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.
User Cal should be performed at least once a year, any time the ambient
temperature of the oscilloscope has changed more than 10 °C since the last User
Cal, or after any repair.
Performing User Cal will not invalidate your Certificate of Calibration.
Successful completion of User Cal does not certify this oscilloscope with a
National Institute of Standards and Technology (NIST) calibration.
1
Disconnect all inputs signals from the oscilloscope
2 Set the rear-panel CALIBRATION switch to UNPROTECTED.
3 Connect the Trig Out signal from the rear panel to analog Channel 1 and
Channel 2 using 3 BNC cables and a BNC-tee connector.
The BNC cables from the BNC-tee to the channel inputs must be the same
length.
4
Press the Utility key, then press the Service softkey.
5 Begin the routine by pressing the User Cal softkey.
6 When the User Cal is completed, set the rear-panel CALIBRATION sw itc h
to
PROTECTED.
service.book Page 7 Wednesday, August 28, 2002 3:25 PM
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