Agilent Technologies E4400-90326 quick start Series Signal Generators, Carrier, Gpib operation

ESG Family Signal Generators		Exploring the User Interface
		Display
ENVLP	This annunciator appears if the burst envelope modulation is
	turned on. This annunciator is present only on ESG-D and ESG-DP
	Series Signal Generators.
ERR	This annunciator appears when an error message is placed in the
	error queue. This annunciator will not turn off until you have either
	viewed all of the error messages or cleared the error queue. You can
	view and delete error messages using the Utility menu.
EXT1 LO/HI	This annunciator toggles between EXT1 LO and EXT1 HI. This
	annunciator appears if the AC-coupled signal to the EXT 1 input is
	less than 0.97 Vpk or greater than 1.03 Vpk.
EXT2 LO/HI	This annunciator toggles between EXT2 LO and EXT2 HI. This
	annunciator appears if the AC-coupled signal to the EXT 2 input is
	less than 0.97 Vpk or greater than 1.03 Vpk.
EXT REF	This annunciator appears when an external 1, 2, 5, or 10 MHz
	frequency reference is in use.
FM	This annunciator appears when frequency modulation is turned on.
I/Q	This annunciator appears when I/Q modulation is turned on. This
	annunciator is present only on ESG-D and ESG-DP Series Signal
	Generators.
L	The L annunciator is turned on when the signal generator is in the
	listen mode and is receiving information or commands over the
	GPIB or RS-232.
MOD OFF	This annunciator toggles between MOD OFF and MOD ON and is
	always visible in the display. This annunciator indicates whether
	the modulations that you have enabled are modulating the RF
	carrier.
OVEN COLD	This annunciator appears when the temperature of the internal
	ovenized reference oscillator (ESG-AP, ESG-DP, and Option 1E5)
	has dropped below an acceptable level.
PULSE	This annunciator appears when pulse modulation is turned on.
R	The R annunciator appears when the signal generator is in remote
	GPIB operation.

Quick Start Guide 2-9