Specifications

620 Appendix G
Messages
Error number:
Messages indicating the internal status of the equipment
Messages that indicate the internal status of the equipment include messages indicating
irregularities of the equipment as well as those indicating the results of processing
(elapsing). These messages do not have numbers.
Messages indicating the measurement failure
DC bias overload
During DC bias voltage application, there was a sudden change on the connecting
condition of DUT, the direct-current impedance has lowered, resulting in momentary
over-current on the DC bias source.
Do not remove DUT during the DC bias application. When this error occurs frequently
during normal measurement, there may be a possible failure on the instrument. When that
is the case, please contact your nearest Agilent Technologies branch office or company
where you have purchased the instrument.
PLL Unlock
Error has been detected in the internal PLL (Phase Lock Loop) circuit of the E4991A. PLL
is used to generate a stable frequency source. It could occur with error on the external
reference signal, or when turning the power ON in the lower temperature.
If the external reference signal is not inputted or have no error, instrument tuning or repair
is necessary. If the message does not disappear in a few minutes after turning the power
ON, instrument tuning or repair is necessary. Please contact your nearest Agilent
Technologies branch office or company where you have purchased the instrument.
Power on test failed
Error was detected during self-test after loading the power.
Please contact your nearest Agilent Technologies branch office or company where you
have purchased the instrument.
RF overload
Due to the sudden change of impedance caused by removal of DUT or other reasons during
the measurement, there was a failure of ranging in the internal circuit.
Do not remove DUT during the measurement. When this error occurs frequently during
normal measurement, there may be a possible failure on the instrument. When that is the
case, please contact your nearest Agilent Technologies branch office or company where
you have purchased the instrument.