Performance Tests 7 
150 Agilent U1602B/U1604B User’s and Service Guide 
Self-Calibration
The self- calibration performs an internal self- alignment routine to 
optimize the signal path that affects channel sensitivity, offset and trigger 
parameters. It is recommended that you run self- calibration in the 
following situations:
• Every 12 months 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
• after experiencing abnormal operation.
• to verify proper operation after repairing.
To start self- calibration, do the following:
1 Press   button to access Utility mode at F4 softkey.
2 On page 3/4 of Utility mode, press F1 to start self- calibration. 
A self- calibration dialog box appears to alert user to remove all input 
connections to the instrument before pressing F1 to start self- calibration.
Disconnect all probe and meter connections to the input terminal of the instrument. 
Allow the instrument to warm up at least 30 minutes before performing 
self-calibration.