Paidong Industrial Zone Qiligang,Yueqing City,Zhejiang province,China.
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    08 Jun, 2023
    Posted by elcb_admin
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    Voltmeters: A Guide to Related Content

    What is a Voltmeter?

    A voltmeter is a measuring instrument used to measure the DC or AC voltage value in a circuit. In use, in order to ensure that the measured parameters are valuable, the voltmeter needs to have a very high resistance in the internal structure, and the voltmeter should be connected in parallel with the circuit to prevent the reading of the voltmeter from being disturbed.

    A din rail voltmeter is a special voltmeter designed to be mounted on a rail, which can provide accurate voltage measurement for various circuit systems, and can be widely used in industrial, commercial, and residential applications.

    Din Rail Single Phase Digital Voltmeter - TOVME-1 60-450VAC
    Din Rail Single Phase Digital Voltmeter - TOVME-1
    Din Rail Three Phase Digital Voltmeter - TOVME-3 60-450VAC
    Din Rail Three Phase Digital Voltmeter - TOVME-3

    The products in the picture above are single-phase and three-phase DIN-rail AC digital voltmeters. This style of voltmeter is very compact and easy to install. It is an ideal solution.

    Voltmeter Symbol

    Voltmeter Symbol - Letter V
    Voltmeter Symbol - Letter V

    What are the types of voltmeters?

    There are many styles of voltmeters. For example, portable multimeters carried by electricians are used to detect current, resistance, and voltage. There are also battery-powered voltmeter devices. Some voltmeters are installed together with the device under test for long-term detection, such as installed Rail voltmeters on the rail.

    There are mainly two main types of voltmeters as follows, namely digital voltmeters, and analog voltmeters.

    Digital voltmeter. The digital voltmeter will display the measured voltage value in digital form, unlike the pointer of other voltmeters, which can reduce the mistakes of observers. In practical applications, digital voltmeters are versatile, inexpensive, and capable of accurate and fast readings.

    Analog voltmeter. The analog voltmeter will move the pointer on the dial to the corresponding scale position according to the voltage value in the circuit. Voltmeters are usually designed to consume the least amount of current in order to minimize the impact on the circuit under test. Due to the use of the pointer, when observing the value of the analog voltmeter, it is necessary to observe whether the analog voltmeter is in a horizontal orientation, and also pay attention to whether there is any other magnetic field interference nearby.

    Unit of measure for a voltmeter

    The unit of voltage is volts (V), and in a circuit, it represents the potential difference between two points. Different voltmeters can measure voltage values in different size ranges, for example, millivolts (mV), volts (V), and kilovolts (kV).

    The accuracy of the measured data depends on the quality and maintenance calibration of the voltmeter product. Generally speaking, a high-quality voltmeter can have better accuracy, and regular maintenance and calibration can also bring reliable measurement data.

    Common application scenarios of voltmeters

    The voltmeter is connected in parallel to the circuit under test and is often used to detect the DC or AC voltage value in various equipment circuits such as electronic equipment, medical equipment, and low-power mechanical equipment. In practical applications, for example:

    1. Detect whether a circuit is energized, such as wall sockets and sockets.
    2. Measure the voltage on the known resistance circuit to calculate the current.
    3. Detect the voltage of the battery to determine whether the battery needs to be charged or replaced.
    4. Monitor the voltage and other information of the device under test to calculate the power consumption of the device under test.

    In the practical application of voltmeters, safety is very important. Voltmeters should be used by professionals who are familiar with how to use them safely, wear appropriate personal protective equipment, and ensure that the rated voltage range of the voltmeter used is suitable for the voltage to be measured.

    How to buy a suitable voltmeter according to your actual needs?

    Considering the type of circuit applied, the voltage range to be measured, and other additional product features, the following factors need to be considered when selecting a voltmeter:

    Circuit Type: Consider the type of circuit the voltmeter will be used in. There are also different options for voltmeters for high-voltage circuits and low-voltage circuits.

    Voltage range: Make sure that the required voltage range is within the voltage range of the selected voltmeter. Note that some voltmeters have a fixed voltage measurement range, while others have multiple selectable voltage measurement ranges.

    Measurement Accuracy: Ensure that the selected voltmeter provides accurate and reliable measurement data. Generally speaking, high-quality voltmeters have more perfect data accuracy.

    Numerical display: Digital voltmeters and analog voltmeters have different numerical display methods. Digital voltmeters use a digital display to show voltage values, while analog voltmeters use scales and needles to show them.

    Other additional functions: additional needs for additional functions, such as data logging, network connection, etc., functions that can provide more convenience.

    It is very important to choose a suitable voltmeter according to your actual needs. This type of voltmeter needs to provide accurate and reliable values and meet specific requirements.

    Why are voltmeters connected in parallel and ammeters in series?

    An ammeter is a measuring device that measures the magnitude of the current in a circuit. Since the resistance of the ammeter is low, the ammeter is basically connected in series with the circuit.

    The voltmeter has high resistance, so the voltmeter is basically connected in parallel to the circuit. Because if the voltmeter is connected in series on the circuit, the high resistance will greatly affect the current on the circuit, resulting in inaccurate measurement data.

    Why is the resistance of the voltmeter high?

    When the voltmeter measures the voltage value, in order to ensure that the current of the device under test is not changed as much as possible, the voltmeter needs to be designed in a high-resistance style. In this way, the current will not flow to the line with the voltmeter, and the accuracy of the measured data can be guaranteed.


    All in all, a voltmeter is an important tool for measuring voltage in a circuit. Voltmeters mainly include analog voltmeters and digital voltmeters, which can measure direct current and alternating current and are widely used in industry, commerce, and residences.