Agilent Technologies E4419B User Manual page 171

During calibration, the power meter automatically switches the power reference oscillator
N O T E
on (if it is not already on), then after calibration, it switches it to the state it was in prior to
the calibration.
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E4419B Power Meter User's Guide
Must Cal Off On
Press this softkey to switch the Zero/Cal Lockout facility On or Off. When
Zero/Cal Lockout is On, the power meter is prevented from making a
measurement until the sensor connected has been zeroed and calibrated.
This softkey is coupled to the equivalent softkey in the System Inputs menu.
TTL Inputs Off On
Press this softkey to disable/enable (Off/On) the ZERO and CAL rear panel
TTL inputs.
Menu Reference 3
149