ESG Family Signal Generators Front and Rear Panel
Display Annotation
User’s Guide 3-11
T
The T annunciator appears when the signal generator is in the talk mode
and is transmitting information over the GPIB or RS-232.
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, for example if I/Q modulation is turned on and no I/Q
signals are connected. A second annunciator,
ALC OFF, will appear in the
same position when the automatic leveling control circuit is disabled.
When the ALC is disabled, the
UNLEVEL annunciator has no meaning, so
these annunciators will never conflict.
UNLOCK This annunciator appears when any of the signal generator’s phase locked
loops are unable to maintain phase lock. You can determine which loop is
unlocked by interrogating the error messages.
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