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Chapter 1 15
Signal Generator Overview
Front Panel Display
1. Active Entry Area
The current active function is shown in this area. For example, if frequency is the active function, the
current frequency setting will be displayed here. If the current active function has an increment value
associated with it, that value is also displayed.
2. Frequency Area
The current frequency setting is shown in this portion of the display. Indicators are also displayed in
this area when the frequency offset or multiplier is used, the frequency reference mode is turned on,
or a source module is enabled.
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 (Option UNT 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 (Option UNT 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 (E8267D or E8257D with Option 1E1 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 (Options 003/004 only) appears when the digital bus is active,
and the internal oven reference oscillator is not cold (OVEN COLD appears in this
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 (Options UNT, UNU, or UNW 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
>1.03V
p
.
EXT2 LO/HI This annunciator (Options UNT, UNU, or UNW 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
.