Agilent Technologies E3633A User Manual page 45

Chapter 3 Front-Panel Operation
Programming Overvoltage Protection
Over
3 Clear the overvoltage condition and exit this menu.
Voltage
Now, when you press
and the
mode.
• Adjust OVP trip level
Over
1 Raise the OVP trip level.
Voltage
Press
Over
2 Move to the OVP CLEAR mode.
Voltage
OVP CLEAR
Press
on the display. Turn the knob to the right until the above message appears on the
display.
Over
3 Clear the overvoltage condition and exit this menu.
Voltage
Now, when you press
second and the
the meter mode.
• Remote interface operation:
VOLT:PROT {<voltage>|MIN|MAX}
VOLT:PROT:STAT {OFF|ON)
VOLT:PROT:CLE
N o t e 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.
32
Over
key again, the "DONE" message is displayed for a second
Voltage
annunciator will not blink any more. The output will return to meter
OVP
Over
key and turn the knob to raise the OVP trip level.
Voltage
Over
key to move to the OVP CLEAR mode. The "OVP ON" message appears
Voltage
Over
key again, the "DONE'' message is displayed for a
Voltage
annunciator will not blink any more. The output will return to
OVP
Set the OVP level
Disable or enable the OVP circuit
Clear the tripped OVP circuit