Front-Panel Operation 3
Keysight E3633A and E3634A User’s Guide 61
– Adjust OVP trip level
1 Raise the OVP trip level.
Press key and turn the knob to raise the OVP trip level.
2 Move to the OVP CLEAR mode.
Press key to move the OVP clear mode. The “OVP ON” message
appears on the display. Turn the knob to the right until the above message
appears on the display.
3 Clear the overvoltage cond ition and exit this menu.
Now, when you press key again, the “DONE” message is displayed for
a second and the OVP annunciator will not blink any more. The output will
return to the meter mode.
– Remote interface operation:
OVP CLEAR
VOLT:PROT {<voltage>|MIN|MAX} Set the OVP level
VOLT:PROT:STAT|{OFF|ON} Disable or enable the OVP circuit
VOLT:PROT:CLE Clear the tripper OVP circuit
The power supply’s OVP circuit contains a crowbar SCR, which effectively shorts
the output of the power supply whenever the overvoltage condition occurs. If
external voltage source such as a battery is connected across the output, and
the overvoltage condition inadvertently occurs, the SCR will continuously sink a
large current from the source; possibly damaging the power supply. To avoid this
a diode must be connected in series with the output as shown in Figure 3-1 on
next page.
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