HP ESA-E Series Programmer's Manual page 372

Exposing the analyzer to high levels of input power over a prolonged
CAUTION
period of time can damage the internal circuitry.
Chapter 7
(LO Align Failure) status bit only, no
message
A failure has occurred during the alignment of the local
oscillator (LO). Measurement results may be invalid.
LO Out Unlevel (LO Out Unleveled)
Indicates the output of the local oscillator (LO) has
become unleveled. This condition must be corrected to
make valid measurements.
LO Unlevel (LO Unleveled)
Indicates the internal circuitry of the local oscillator
(LO) has become unleveled. This condition must be
corrected to make valid measurements.
LO Unlock (Synth Unlocked)
Indicates the phase locked circuitry of the local
oscillator (LO) has become unlocked. This condition
must be corrected to make valid measurements.
Meas Uncal (Measurement Uncal)
The measurement is uncalibrated. Check the sweep
time, span and bandwidth settings, or press
.
Couple
Overload: Reduce Signal and press <ESC>
(Input Overload Tripped)
This message applies to the HP E4401B and
E4411B only. A signal has been applied to the input
connector that caused the overload protection circuitry
to engage. The input signal must be reduced. After the
signal is reduced, press
detector so that you can continue using the analyzer.
Error Messages
Status Messages
to reset the overload
ESC
Auto
7-5