Joy-it COM-VM330 User guide

www.joy-it.net

Pascalstr. 8 47506 Neukirchen-Vluyn

VOLTMETER WITH 3-DIGIT LED DISPLAY

COM-VM330

1. GENERAL INFORMATION

Dear customer,

Thank you for purchasing our product. In the following, we will show you
which things should be noted during the use.

Should you encounter any unexpected problems, do not hesitate to
contact us.

www.joy-it.net

Pascalstr. 8 47506 Neukirchen-Vluyn

2. USAGE

This voltmeter can measure DC voltages from 3 V to 30 V without

requiring an additional power supply for the meter.

To measure a voltage, connect the positive end of the voltage you want
to measure to the positive terminal of the voltmeter (red wire) and the
negative end of the voltage source to the negative terminal of the
voltmeter (black wire).

You can also measure voltages below 3 V with this voltmeter, but for this

you have to supply power to the display regardless of the measuring
voltage. This requires soldering, because you have to remove a solder
bridge on the back of the unit and solder more wires to the board.

Now you have a new pin assignment on the measuring device. Please

note that two ground connections must be connected to the negative

terminal of the measuring device (black cable) (one for the measuring
voltage and one for the supply voltage).

New pin assignment

V + -

Measuring voltage +

(0 - 30 V)

Supply voltage +

(3V)

Measuring voltage -

Supply voltage -

V + -

Not connected

Measuring voltage +

( 3 V - 30 V)

Measuring voltage -