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Chapter 3 Front-Panel Operation
Programming Overvoltage Protection
42
Programming Overvoltage Protection
Overvoltage protection guards the load against output voltages that reach a
specified value greater than the programmed protection level. It is
accomplished by shorting the output via an internal SCR when the trip level is
set to equal or greater than 3 volts, or by progamming the output to 1 volt when
the trip level is set to less than 3 volts.
The following steps show how to set the OVP trip level, how to check OVP
operation, and how to clear overvoltage condition.
• Front-panel operation:
Setting the OVP Level and Enable the OVP Circuit
1 Turn on the power supply.
The power supply will go into the
power-on / reset
state; the output is disabled
(the
OFF annunciator turns on); the 8V/20A* or 25V/7A** range is selected (the
8V* or 25V** annunciator turns on); and the knob is selected for
voltage
control.
2 Enable the output.
The
OFF annunciator turns off and the display will go to the meter mode.
3 Enter the OVP menu and set the trip level.
You will see the above message on the display when you enter the OVP menu.
Adjust the control knob for the desired OVP trip level.
Note that you cannot set the trip levels to lower than 1.0 volt.
4 Enable the OVP circuit.
You will see the above message after pressing key.
LEVEL 22
22
2.0V (E3633A)
LEVEL 55
55
5.0V (E3634A)
OVP ON
Power
Output
On/Off
Over
Voltage
Over
Voltage
Over
Voltage
*For Agilent E3633A Model **For Agilent E3634A Model