Operation Overview
3-11
3.12.1
Overvoltage
The overvoltage protection circuit is set at a level slightly above the voltage range
specified in the specification of the Load. The overvoltage (OV) and voltage fault (VF)
status register bits are set when the OV condition occurs. They will remain set until
they are reset. The Load module will display ovP when overvoltage protection occurs.
3.12.2
Ove
r
current
When the Load is operating in CR or CV mode, it is possible for a module to attempt to
sink current more than it is rated for. The limit level of current is set at a level slightly
above the current of the Load. The overcurrent (OC) and current error (CE) status
register bits are set when the OC condition occurs, and will remain set until they are
reset. The Load module will display oCP when overcurrent protection occurs.
3.12.3
Overpower
The overpower protection circuit is set at a level slightly above the power range
specified in the specifications of the Load. The overpower (OP) and power error (PE)
status register bits are set when the OP condition occurs, and will remain set until they
are reset. The Load module will display oPP when overpower condition occurs.
3.12.4
Overtemperature
Each Load has an overtemperature protection circuit that will turn off the load if the
internal temperature exceeds a safe limit. The overtemperature (OT) and temperature
error (TE) status register bits are set when the condition occurs, and will remain set until
they are reset. The Load module displays otP if an overtemperature condition occurs.
3.12.5
Reverse Voltage
The Load conducts a reverse current when the polarity of the UUT connection is not
correct. The maximum safe reverse current is the same as the rated current of the
Load. If the reverse current of the UUT is over the rated current of the Load, the Load
may be damaged. If a reverse voltage condition is detected, you must turn off power
to the UUT immediately, and make a correct connection. The reverse voltage (RV)
and voltage fault (VF) status register bits are set when the RV condition occurs, and will
remain set until they are reset. The Load module will display rEv when reverse voltage
protection occurs.
All of the protection features will latch when they are tripped. When any protection
occurs the module will turn off the load input, and produce beep sound until you remove
the condition and reset protection by pressing LOAD key on the module.
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