Operations and Features 3
Keysight U8001A/U8002A User’s and Service Guide 39
To disable OVP
1 Press on the “Over Voltage” button to disable the OVP. The OVP annunciator
will eventually turn off.
To clear the over voltage condition
1 OVP trip can only occur when the output is enabled. When the OVP condition
occurs:
– The output is disabled and the OFF annunciator will be turned on.
– If the keylock feature was enabled, it will be disabled. The LOCK annuciator
will be turned off.
– The OVP annunciator will fast-blink continuously.
– The display will show “TRIP”.
2 To clear the OVP trip conditon, press on the “Over Voltage” button again.
If OVP trip persists, decrease the voltage limit settings to clear the tripping.
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 an
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 and possibly damaging the power supply. To avoid
this, a diode must be connected in series with the output as shown in Figure 3-1.
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