DC 0~30V Digital Voltmeter LED Display

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Overview: DC 0~30V Digital Voltmeter LED Display 

The 3-wire digital voltmeter with a red LED display for measuring DC voltage typically has three wires: a positive power wire, a ground wire, and a measurement wire. Here’s a general pinout description for such a voltmeter:

Red Wire (Power Supply Positive, Vcc): This wire is connected to the positive terminal of the power supply. It provides the voltage required to power the voltmeter itself. This wire is usually connected to a voltage source within the operating range of the voltmeter (often between 4.5V and 30V).

Black Wire (Ground, GND): This wire is connected to the ground or negative terminal of the power supply. It serves as a common ground for both the power supply and the voltage measurement.

Yellow/White Wire (Measurement, Vin): This wire is connected to the point where the voltage is to be measured. This wire allows the voltmeter to sense the voltage of the circuit or battery.

Typical Connection:

Red Wire: Connect to the positive terminal of the power source (e.g., +12V from a car battery).

Black Wire: Connect to the ground or negative terminal of the power source.

Yellow/White Wire: Connect to the point where you want to measure the voltage.

      +--------------+

      |   Voltmeter  |

      |              |

      |  Red (Vcc)   +------> + Power Supply (e.g., +12V)

      |  Black (GND) +------> Ground (0V)

      |  Yellow (Vin)+------> Point to measure voltage

      +--------------+

Notes:

Ensure the power supply voltage does not exceed the operating range of the voltmeter. 30 Volts

The measurement wire should be connected to the point where you want to monitor the voltage. It can be connected to the same power supply being used to power the voltmeter if you're measuring the power supply voltage itself, or it can be connected to a different voltage source.

If there is only one voltage source and you are measuring that same source, the yellow/white wire can often be connected to the red wire.

This is a general guide, and it's always recommended to refer to the specific datasheet or manual for your voltmeter model for precise information.