APLVA400 Industrial Controls

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As a component of electrical and electronics, panel meters are usually used for measuring a variety of electrical quantities such as voltage, current, power, frequency, resistivity, and others. Panel meters of different types have different applications, and the APLVA 400 panel meter is no exception. This article provides a brief introduction to the APLVA 400 panel meter and its working principle, with special attention to its application field and working principle.

Developed by the Yokogawa Electric Corporation, the APLVA 400 panel meter is an analog display type instrument designed for measuring direct current voltage, direct current current, and power of low power circuits. It features two analog displays, housed in the same case: one for measuring DC voltage, and the other for measuring DC current. Apart from the DC voltage/current measurement, the APLVA 400 can also be used to measure power in low power circuits.

The APLVA 400 panel meter comes with an input voltage of 200V in AC and DC. The internal circuit of this instrument includes an amplifying circuit, an instrumentation amplifier, a voltage-coefficient resistance, and analog displays. In the AC input mode, the APLVA 400 is connected to a 3-block terminal for AC measurement. The instrumentation amplifier is placed between the two incoming terminals, and the voltage-coefficient resistance is connected ladder-like in between the two analog displays. This allows the instrument to read the input voltage and current, and display them on the analog displays.

As far as its application field is concerned, since the APLVA 400 displays DC voltage and current readings, its most likely usage is in low power and light construction projects. It can be used for measuring voltage and current in vehicles running on electric power, for trouble-shooting electric systems, for monitoring power output from solar and wind power systems, and for measuring watt-hours in various electrical projects. Other application fields include the monitoring and control of industrial processes, measuring output signals from transducers, and for educational purposes in teaching electrical engineering courses.

As for the working principle of the APLVA 400 panel meter, it relies mainly on the instrumentation amplifier. This type of amplifier is configured in a differential mode, which prevents the output voltage signal from being affected by high frequency disturbances. When an AC input voltage is applied to the APLVA 400 panel meter, the instrumentation amplifier amplifies the incoming signal with considerable accuracy and precision. The amplified signal is then sent to the two analog displays, where the voltage and current reading are displayed according to the reading range of the meter.

In conclusion, this article has provided an overview of the APLVA 400 panel meter, including its application field and working principle. This instrument is designed for measuring DC voltage and current in low power circuits, and for measuring power in various low power projects. It is usually used in vehicles running on electric power, for trouble-shooting electric systems, for monitoring power output from solar and wind power systems, and for measuring watt-hours in various electrical projects. As far as its working principle is concerned, the APLVA 400 panel meter relies on an instrumentation amplifier to amplify an AC input voltage, and then send the signal to the two analog displays, where the voltage and current readings are displayed for visual inspection.

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