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4 - Front Panel Operation
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Condition Action
OV Condition
Usually overvoltage conditions are caused by an external source forcing voltage into the output
of the ac source. Remove this external source to eliminate the overvoltage. You can also
program the overvoltage level to a higher value, or turn the overvoltage protection off.
In other cases the output voltage may have exceeded the user-programmed overvoltage level. In
this case the unit may have inadvertently been programmed to a voltage that exceeded the
programmed overvoltage level. The VOLTage:PROTection command sets the overvoltage
protection level.
Note: The overvoltage protection level is programmed in peak, not rms volts.
OCP Condition
If the CURRent:PROTection:STATe command has been programmed to to disable the output
when rms current limit is activated, the unit will shut down. The rms current limit threshold is
set by the CURRent command. In this case you must check to see why the load is drawing more
current than the limit that has been programmed by the CURRent command.
SOA Condition
Protection circuits in the ac source let the load draw peak currents for short periods of time that
exceed the continuous capability of the unit. This allows loads that require large inrush currents
to turn on. The ac source will shut down if a combination of peak current duration and internal
component temperature exceeds a predetermined limit.
When this occurs, it means that the load has been drawing peak output currents that are beyond
the capability of the ac source to supply for extended periods. Slower output slew rates and
reduced peak current limit settings can be used to control the conditions that cause SOA
shutdowns.
OT Condition
When the internal operating temperatures of the ac source exceed predetermined thresholds, the
output turns off. If this happens, you must let the unit cool down before continuing operation.
RI Condition
If the Remote Inhibit input has been programmed to to disable the output when it receives an
external signal, the unit will shut down. The Remote Inhibit input is set by the
OUTPut:RI:MODE command. In this case you must check to what external event produced a
signal on the RI input.
Rail Condition
The internal high voltage rail that provides power for the ac source’s output is continuously
monitored for proper voltage level. If this voltage is not maintained within predetermined levels,
the output will shut down. This can happen if an extenal source forces too much power into the
ac source or if too much power is drawn from the ac source.
Remove the external source to eliminate the rail condition. Slower output slew rates and reduced
peak current limit settings can also be used to control the conditions that cause rail shutdowns.
6 - Using Transient Voltage Modes
The ac source voltage can be programmed in the following transient operating modes:
STEP causes the output to permanently change to its triggered value.
PULSE causes the output to change to its triggered value for a specific time, as determined by the
Pulse menu parameters.
LIST causes the output to sequence through a number of values, as determined by points entered
in the List menu.
FIXED disables transient operation for the selected function.