ASR-3000 Series User Manual 
30 
Alarms 
The ASR-3000 series have a number of protection features. When 
one of the protection alarms is tripped, the ALM icon on the 
display will be lit and the type of alarm that has been tripped will 
be shown on the display. When an alarm has been tripped the 
output will be automatically turned off. For details on how to clear 
an alarm or to set the protection modes, please see page 210. 
 
This alarm is activated and output will be 
disabled immediately when output overvoltage 
or overcurrent is detected. 
Abnormal Power 
Source Block 
This alarm is activated and output will be 
disabled immediately when internal power 
source abnormality is detected. Beware that all 
operations will be disabled except for the power 
shutdown operation if an error occurs. 
Abnormal Internal 
Control 
This alarm is activated and output will be 
disabled immediately when internal control 
abnormality is detected. Beware that all 
operations will be disabled except for the power 
shutdown operation if an error occurs. 
Voltage limit protection prevents a high voltage 
from damaging the DUT. This alarm can be set 
by the user. 
Frequency limit protection prevents a high 
frequency from damaging the DUT. This alarm 
can be set by the user. 
Over current protection prevents high current 
from damaging the DUT. This alarm can be set 
by the user. 
Over temperature protection for power stage 
board. OTP is a hardware protection function. 
Only when the unit has cooled can the over 
temperature protection alarms be cleared.