2 Features and Functions62 Keysight U1731C/U1732C/U1733C User’s GuideThe annunciator is shown on the display while the relative mode is active. Pressagain to exit the relative mode.Performing the open/short CALThe CAL function offsets (corrects) the LCR meter's internal parameters as well asexternal connector residues for further measuring. Performing this action will helpyou to correct the influence for temporary uses.There are three types of open/short CAL available:– OS-Factory: Open/Short CAL is performed during factory calibration mode(security code protected). It covers all frequencies and all ranges.– OS-User: Open/Short CAL is performed at every power-on option interval. Itcovers all frequencies and all ranges. (see page 26 for the OS-User setup).– Open/Short CAL for single range and frequency by pressing and holding thekey for more than 1 second.The corrections for the and are pre-stored in the LCRmeter. They are both calibrated at the terminal ends.You can set the LCR meter to start up using the or open/short CAL from the Setup menu (see page 76).CalNullNOTE – The relative mode cannot be activated if the display value is .– Relative mode is only available in manual ranging; therefore, activation whilein autoranging will automatically set the LCR meter to manual ranging.– The relative mode cannot be activated if the LCR meter is set at auto-rangingwith data hold activated.CalNull