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14 Chapter 1
Signal Generator Overview
Front Panel Display
3. Annunciators
The display annunciators show the status of some of the signal generator functions and indicate any error
conditions. An annunciator position may be used by more than one function. This does not create a problem,
because only one function that shares an annunciator position can be active at a time.
ΦM This annunciator (E8257C and E8267C only) appears when phase modulation is on. If
frequency modulation is on, the FM annunciator replaces ΦM.
ALC OFF This annunciator appears when the ALC circuit is disabled. A second annunciator,
UNLEVEL, appears in the same position if the ALC is enabled and cannot maintain the
output level.
AM This annunciator (E8257C and E8267C only) appears when amplitude modulation is on.
ARMED This annunciator appears when a sweep has been initiated and the signal generator is
waiting for the sweep trigger event.
ATTEN HOLD This annunciator (Option 1E1 or E8267C only) appears when the attenuator hold
function is on. When this function is on, the attenuator is held at its current setting.
DIG BUS This annunciator appears when the Digital Bus is active, and the internal oven reference
oscillator is not cold (they appear in the same location).
ENVLP This annunciator appears if a burst condition exists, such as when marker 2 is set to
enable RF blanking in the Dual ARB format.
ERR This annunciator appears when an error message is in the error queue. This annunciator
does not turn off until you either view all the error messages or cleared the error queue.
To access error messages, press
Utility > Error Info.
EXT This annunciator appears when external leveling is on.
EXT1 LO/HI This annunciator (E8257C and E8267C only) appears as either EXT1 LO or EXT1 HI,
when the ac-coupled signal to the EXT 1 INPUT is <0.97 V
p
or >1.03 V
p
.
EXT2 LO/HI This annunciator (E8257C and E8267C only) is displayed as either EXT2 LO or
EXT2 HI. This annunciator appears when the ac-coupled signal to the EXT 2 INPUT is
<0.97 V
p
or >1.03 V
p
.
EXT REF This annunciator appears when an external frequency reference is applied.
FM This annunciator (E8257C and E8267C only) appears when frequency modulation is
turned on. If phase modulation is turned on, the ΦM annunciator will replace FM.
I/Q This annunciator (E8267C with Option 002/602 only) appears when I/Q modulation is
turned on.
L This annunciator appears when the signal generator is in listener mode and is receiving
information or commands over the RS-232, GPIB, or VXI-11 LAN interface.