Normal
Operation
Error and
Warning/
Status
Messages
When an abnormal condition is detected during op-
eration, the 681XXC displays an error message to
indicate that the output is abnormal or that a signal
input or data entry is invalid. It also displays warn-
ing messages to alert the operator to conditions that
could cause an inaccurate signal generator output.
Status messages to remind the operator of current
menu selections or settings are also generated.
Table6-2 is a summary list of possible error mes-
sages that can be displayed during normal opera-
tions. Table6-3 is a summary list of possible
warning/status messages.
6-8 681XXC OM
OPERATOR ERROR AND WARNING/
MAINTENANCE STATUS MESSAGES
Error Message Description
ERROR Displayed(on the frequency mode title bar) when (1) the
outputfrequency is not phase-locked or (2) an invalid
entrycauses a frequency range error.
LOCK ERROR Displayed(in the frequency parameters area) when the
outputfrequency is not phase-locked. The frequency
accuracyand stability of the RF output is greatly reduced.
Normallycaused by an internal component failure. Run
self-testto verify malfunction.
RANGE Displayed(in the frequency parameters area) when (1)
theanalog sweep start frequency entered is greater than
thestop frequency, (2) the dF value entered results in a
sweepoutside the range of the instrument, (3) the step
sizevalue entered is greater than the sweep range, (4)
thenumber of steps entered results in a step size of less
than1 kHz (0.1 Hz with Option 11) or 0.1 dB (0.001 mV),
or(5) the step sweep time entered divided by the number
ofsteps entered does not result in a dwell time of
<10ms. Entering valid values usually clears the error.
ERR Displayed(in the modulation status area) when either the
externalAM modulating signal or the external FM
modulatingsignal exceeds the input voltage range. In ad -
dition,the message “Reduce AM (FM) Input Level”ap-
pearsat the bottom of the AM (FM) status display. AM
(FM)will be turned off until the modulating signal is in the
inputvoltage range.
Table6-2. Possible Error Messages during Normal Operations