Agilent Technologies Official Manual for Agilent PSG Signal Generators

	Signal Generator Overview
	Front Panel Display
MOD ON/OFF	This annunciator (E8257C and E8267C only) which is always present on the display,
	indicates whether active modulation formats have been enabled or disabled with the
	Mod On/Off hardkey. Pressing the Mod On/Off hardkey enables or disables all active
	modulation formats (AM, FM, Φ M, Pulse, or I/Q) that are applied to the output carrier
	signal available through the RF Output connector. The Mod On/Off hardkey does not set
	up or activate an AM, FM, Φ M, Pulse, or I/Q format; each individual modulation
	format must still be set up and activated (for example, AM > AM On) or nothing will be
	applied to the output carrier signal when the Mod On/Off hardkey is enabled.
OVEN COLD	This annunciator (Option UNR only) appears when the temperature of the internal oven
	reference oscillator has dropped below an acceptable level. When this annunciator is on,
	frequency accuracy is degraded. This condition should occur only if the signal generator
	is disconnected from line power.
PULSE	This annunciator (E8257C and E8267C only) appears when pulse modulation is on.
R	This annunciator appears when the signal generator is remotely controlled over the
	GPIB, RS-232, or VXI-11/Sockets LAN interface (TELNET operation does not activate
	the R annunciator). When the R annunciator is on, the front panel keys are disabled,
	except for the Local key and the line power switch. For information on remote
	operation, refer to the Programming Guide.
RF ON/OFF	This annunciator indicates when the RF and microwave signal is present (RF ON) at the
	RF OUTPUT, or if the RF and microwave signal is not present (RF OFF) at the RF
	OUTPUT. Either condition of this annunciator is always visible in the display.
S	This annunciator appears when the signal generator has generated a service request
	(SRQ) over the RS-232, GPIB, or VXI-11 LAN interface.
SWEEP	This annunciator appears when the signal generator is in list, step, or ramp sweep mode;
	ramp sweep is available with Option 007 only. List mode is when the signal generator
	can jump from point to point in a list (hop list); the list is traversed in ascending or
	descending order. The list can be a frequency list, a power level list, or both. Step mode
	is when a start, stop, and step value (frequency or power level) are defined and the
	signal generator produces signals that start at the start value and increment by the step
	value until it reaches the stop value. Ramp sweep mode (Option 007 only) is when a
	start and stop value (frequency or power level) are defined and the signal generator
	produces signals that start at the start value and produce a continuous output until it
	reaches the stop value.
T	This annunciator appears when the signal generator is in talker mode and is transmitting
	information over the GPIB, RS-232, or VXI-11 LAN interface.
UNLEVEL	This annunciator appears when the signal generator is unable to maintain the correct
	output level. The UNLEVEL annunciator is not necessarily an indication of instrument
	failure. Unleveled conditions can occur during normal operation. A second annunciator,
	ALC OFF, will appear in the same position when the ALC circuit is disabled.
Chapter 1	15