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Output Function

The heavy solid line illustrates the locus of possible operating points as a

function of output. As shown by the vertical portion of the line, the output current

remains regulated at its programmed setting as long as the output voltage

remains within its limit setting. A CC (constant current) status flag indicates that

the output current is being regulated and the output voltage is within its limit

settings.

Note that when the output voltage reaches the upper limit, the unit no longer

operates in constant current mode and the output current is no longer held

constant. Instead, the unit will now regulate the output voltage at its voltage limit

setting.

As shown by the horizontal portion of the shaded quadrants, when the unit is

sinking power, the output current may continue to increase in the negative

direction as more current is forced into the unit. This can happen when the

instrument is connected to an external device such as a battery, and its output

voltage is higher than the voltage limit setting of the instrument. Once the

current exceeds the built-in negative over-current limit, the output will shut

down. In such a case, it is important to set the voltage limit properly in order

prevent this protection shutdown.

How to Set

1. Press the composite keys [Shift]+[V-set] (Config) to enter the Config menu.

2. Rotate the knob to select Mode, and press [Enter] to setting interface.

3. Rotate the knob to select CV Priority or CC Priority and press [Enter] to

confirm.

When choosing different priority mode, the V-Rise Time/ V-Fall Time or I-

Rise Time/ I-Fall Time configuration will be dynamically displayed in config

menu.

4. Press [Esc] to exit.

4.2 Set the Output Voltage

The voltage setting range is between 0 to full rated output voltage, When the

[V-set] key is pressed, the light will be lit. At this time, the voltage setting value

flashes and the voltage value can be set.

• Under CV priority, press [V-set] to set the output voltage level.

• Under CC priority, press [V-set] to set the voltage high limit value, and

repeat press [V-set] to set the VH/VL limit value. This limit limits the output

voltage to a specified range.

ITech IT-M3400 Series User Manual

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