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A voltmeter is an instrument used for measuring the electrical potential difference between two points in an electric circuit. Analog voltmeters move a pointer across a scale in proportion to the voltage of the circuit; digital voltmeters give a numerical display of voltage by use of an analog to digital converter.

A voltmeter in a circuit diagram is represented by the letter V in a circle.

Voltmeters are made in a wide range of styles. Instruments permanently mounted in a panel are used to monitor generators or other fixed apparatus. Portable instruments, usually equipped to also measure current and resistance in the form of a multimeter, are standard test instruments used in electrical and electronics work. Any measurement that can be converted to a voltage can be displayed on a meter that is suitably calibrated; for example, pressure, temperature, flow or level in a chemical process plant.

General purpose analog voltmeters may have an accuracy of a few percents of full scale and are used with voltages from a fraction of a volt to several thousand volts. Digital meters can be made with high accuracy, typically better than 1%. Specially calibrated test instruments have higher accuracies, with laboratory instruments capable of measuring to accuracies of a few parts per million. Meters using amplifiers can measure tiny voltages of microvolts or less.

Specificatoins of DC Voltmeter & Ammeter with Digital Display - 100V 10A:

  • Output Type: Digital
  • Display: 0.28" LED digital
  • Operating Voltage: 4V ~ 30V
  • Operating Current: <20mA
  • Measure voltage: 0V ~ 100V
  • Minimum Voltage resolution: 0.1V
  • Refresh rate: 500ms / times
  • Measure accuracy: 1% (1 digit)
  • Measure current: 10A
  • Minimum Current Resolution: 0.01A
  • Operating temperature: -10°C ~ 65°C
  • Operating Humidity: 10% ~ 80%
  • Size: 48mm x 29mm x 21mm

How to Use DC Voltmeter & Ammeter with Digital Display - 100V 10A:


The Thick Red Line (VCC): Power supply input positive

The Thick black line (GND): Power supply input negative

The Thin yellow line (V+): Voltage measuring positive

The Thin red line (I+): Current measuring positive

The Thin black line: Current or Voltage measuring negative

How to wiring: https://www.botnroll.com/img/cms/current-voltage-meter-wiring.png

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