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Protection Function

momentary conditions would not be considered an over-power protection fault,

and having an UVP condition disable the output when they occur would be a

nuisance. Specifying an UVP delay lets the UVP circuit ignore these momentary

changes during the specified delay period. Once the UVP delay time has

expired and the over-power condition persists, the output will shut down.

Clear UVP Protection

When UVP occurs, the instrument responds as follows:

• Instrument input is off;

• The buzzer sounds;

• The interface displays “Under Voltage Protect” and flashes;

• Status register, the UV status bit is set to 1;

To clear the UVP and return to normal operation, firstly remove the conditions

that caused the protection fault. Press [Esc] key (or send the command

PROTection:CLEar) to clear the protection status. The Under Voltage Protect

displayed in front panel is cleared and the instrument exits OPP status.

6.4 Sense abnormal protection function

When the Remote Measure Function (Sense Function) is enabled, after the in-

strument’s On/Off switch is turned on, automatically detect the wiring conditions

of the Sense+ and Sense- terminals on the rear panel. If the Sense interface is

not connected or reversed connected, the instrument would make judgment

based on the measured voltage data. When the voltage difference between the

local voltage and remote voltage is greater than a certain value and such condi-

tion continues for a period, the instrument would report Sense abnormal protec-

tion and turn off the output. The output voltage is subject to local voltage, and

the instrument interface would prompt “Sense Protect”. This protection can pre-

vent the instrument from outputting high voltage when the Sense terminal is not

wired or when the line is loosened or reverse-connected under Remote Meas-

ure state, which may damage the DUT.

The Sense Protect will be triggered when the instrument state meets the follow-

ing conditions.

• The Sense Measure function is enabled in the Sestem menu.

• On/Off is turned on;

• The voltage difference between the local voltage measured by the instru-

ment and the remote voltage exceeds the specification value internally set

by the instrument;

ITech IT-M3300 Series User Manual

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