DK803A

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Panel meters are known as a type of measuring device, typically seen in analog displays. The DK803A series of panel meters belong to this category, and are specialized in displaying a wide range of values within a limited range at very low cost. This article will overview the application fields and working principle of the DK803A series.

Application Fields

The DK803A series are mainly used in a variety of applications that require measurement and display of various electrical parameters. Specifically, they can be used for monitoring electrical currents, free air temperatures, air velocity, and for many other applications. Besides, they can also be used for monitoring air, water, and other flow regimes. Generally, the DK803A panel meters are suitable for any application that requires the measurement of limited electrical parameters in a relatively small area.

Working Principle

The DK803A series works mainly on the principle of a bridge rectifier circuit. In this circuit, both AC and DC signals are fed into the meter\'s bridge rectifier, and their corresponding voltages measured and displayed on the corresponding meter. Generally, two different types of bridge rectifier circuits are commonly used for the DK803A series: optically coupled bridge rectifier circuit and voltage divider bridge rectifier circuit. In the optically coupled bridge rectifier circuit, a beam of infrared radiation is used to measure the signal strength and the corresponding voltage. The voltage divider bridge rectifier circuit works by using two resistors to divide the voltage into two parts, which are then fed into the bridge rectifier to measure the signal strength and the corresponding voltage.

Aside from the rectifier circuit, the DK803A series also make use of a differential amplifier to amplify the input signal. This is done by introducing a small amount of feedback, which allows for the gain of the input signal to be accurately controlled. This is done to ensure that the panel meter is able to accurately display the input voltage. Additionally, a scaling factor can also be set up, which allows the user to set a particular value at which the meter will register the displayed value.

Conclusion

The DK803A panel meters are used in a variety of applications that require the measurement and display of electrical parameters. They are specially designed to provide reliable, accurate, and low-cost measurements of various electrical parameters in a wide range of applications. The working principle of the DK803A series is mainly based on a bridge rectifier circuit, which makes use of an optically coupled bridge rectifier circuit and a voltage divider bridge rectifier circuit. Additionally, the series also make use of a differential amplifier to amplify the input signal for accurate voltage readings.

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