HP 83751A User Manual page 90

OFFSET
This annunciator indicates that the displayed frequency is
offset from the actual RF output frequency.
MSG This annunciator indicates that the sweeper has a new
message that has not been displayed, such as an error
message or instrument failure message. Messages are viewed
by pressing the front panel CMsGl key.
MKRS This annunciator appears when any of the markers (0 to 9)
are on.
EXTMOD This annunciator appears under any of the following
conditions:
AM Mode = External
l
FM Mode = AC/Locked or DC/Unlocked
l
Pulse Mode = External
l
INTMOD This annunciator appears if Pulse Mode is set to Internal,
Scalar, or 1 kHz square-wave.
UNLOCK This annunciator appears when any of the internal
synthesizer loops are unlocked.
STEP This annunciator indicates that the Sweep Mode is set to
Stepped Sweep.
UNCPLD This annunciator indicates that automatic coupling between
the attenuator and the ALC reference level is turned off in
the Special area. (For Option 1El instruments only). This
mode is automatically selected whenever the ALC mode is
not in internal mode or unleveled mode.
EXT ALC This annunciator indicates that the ALC mode is set to
either Diode or Power meter.
This annunciator indicates that the Power Sweep function is
active.
SLOPE This annunciator indicates that the Power Slope function is
active.
UNLEV This annunciator indicates that the source is unable to
maintain the correct output power level for the current
output frequency, or that the ALC is turned off.
RF OFF This annunciator indicates that the RF output is turned off.
Front/Rear Panel
Display
7-21