Agilent Technologies E3634A manual Ovp Clear, Over Voltage Over Voltage Over Voltage Over Voltage

Press OverVoltage

Over

Voltage

Over

Voltage

Over

Voltage

Over

Voltage

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Chapter 3 Front-Panel Operation

Programming Overvoltage Protection

3Clear the overvoltage condition and exit this menu.

Now, when you press OverVoltage key again, the “DONE” message is displayed for a second and the OVP annunciator will not blink any more. The output will return to meter mode.

•Adjust OVP trip level

1 Raise the OVP trip level.

Press OverVoltage key and turn the knob to raise the OVP trip level.

2Move to the OVP CLEAR mode.

OVP CLEAR

key to move to 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.

3Clear the overvoltage condition and exit this menu.

Now, when you press OverVoltage 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:

VOLT:PROT {<voltage>MINMAX}	Set the OVP level
VOLT:PROT:STAT {OFFON)	Disable or enable the OVP circuit
VOLT:PROT:CLE	Clear the tripped 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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