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Protect Function

• Enable UVP;

• The output time exceeds the warm-up time;

• The output voltage value is less than the set voltage protection point Level

and the period is greater than the set protection delay time Delay.

Enable UVP

1. Press [Shift]+[R-set](Protect) to enter Protect menu interface.

2. Rotate the knob to select UVP and press [Enter] key to confirm.

3. rotate the knob to select On and press [Enter] key to confirm.

4. Rotate the knob to adjust the warm-up time Warm Up and press [Enter] key

to confirm.

5. Rotate the knob to adjust the under-voltage limit Level and press [Enter] key

to confirm.

6. Rotate the knob to adjust the delay time Delay and press [Enter] key to

confirm.

7. Press [Esc] to exit.

Warm-up time

You can specify the warm-up time for UVP protection to make the instrument

not judge the under-voltage protection fault within the specified warm-up time.

Delay time

You can specify an UVP delay to prevent momentary output settings, DUT and

status changes from tripping the under-voltage protection. In most cases these

momentary conditions would not be considered an under-voltage 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 under-voltage condition persists, the output will shut

down.

Clear Under-voltage Protection

When under-voltage protection occurs, the instrument responds as follows:

• Instrument output 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 under-voltage 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

ITech IT-M3412 User Manual

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