Signal Generator Overview
Front Panel Display
Chapter 1 13
EXT2 LO/HI This annunciator is displayed as either EXT2 LO or EXT2 HI. This
annunciator appears whenever 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
Φ
M annunciator will replace FM.
L This annunciator appears when the signal generator is in listener mode and
is receiving information or commands over the GPIB interface.
MOD ON/OFF This annunciator indicates if the RF carrier is modulated (MOD ON), or if the
modulation is off (MOD OFF). Either condition of this annunciator is always
visible in the display.
OVEN COLD This annunciator 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. The
annunciator is timed, and automatically turns off after a specified period.
PULSE This annunciator appears when pulse modulation is turned on.
R This annunciator appears when the signal generator is in remote GPIB
operation.
RF ON/OFF This annunciator indicates when the RF signal is present (RF ON) at the RF
OUTPUT, or if the RF 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 GPIB interface.
SWEEP This annunciator appears when the signal generator is sweeping in list or
step mode.
T This annunciator appears when the signal generator is in talker mode and
is transmitting information over the GPIB 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.
UNLOCK This annunciator appears when any of the phase locked loops are unable to
maintain phase lock. You can determine which loop is unlocked by
examining the error messages.
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