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Chapter 1 15
Signal Generator Overview
Front Panel Display
2. Annunciators
The display annunciators show the status of some of the signal generator functions, and
indicate 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 given time.
ΦM This annunciator appears when phase modulation is turned on. If frequency
modulation is turned on, the FM annunciator will replace
ΦM.
ALC OFF This annunciator appears when the ALC circuit is disabled. A second
annunciator, UNLEVEL, will appear in the same position if the ALC is enabled
and is unable to maintain the output level.
AM This annunciator appears when amplitude modulation is turned 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 appears when the attenuator hold function is turned on.
When this function is on, the attenuator is held at its current setting.
BERT This annunciator appears when the Option UN7 bit error rate test (BERT)
functions are turned on.
ENVLP This annunciator appears if the burst envelope modulation is turned on.
ERR This annunciator appears when an error message is placed in the error
queue. This annunciator will not turn off until you have viewed all of the
error messages or cleared the error queue. You can access error messages by
pressing
Utility > Error Info.
EXT This annunciator appears when external leveling is turned on.
EXT1 LO/HI This annunciator is displayed as either EXT1 LO or EXT1 HI. This
annunciator appears when the ac-coupled signal to the EXT 1 INPUT is less
than 0.97 V
p
or greater than 1.03 V
p
.
EXT2 LO/HI This annunciator is displayed as either EXT2 LO or EXT2 HI. This
annunciator appears when the ac-coupled signal to the EXT 2 INPUT is less
than 0.97 V
p
or greater than 1.03 V
p
.
EXT REF This annunciator appears when an external frequency reference is applied.
FM This annunciator appears when frequency modulation is turned on. If phase
modulation is turned on, the ΦM annunciator will replace FM.
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