89771-18

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Panel Meters - Counters, Hour Meters includes a wide range of sensing, controlling, and monitoring devices used in a variety of industrial and commercial applications. These instruments enable the measurement of current, voltage, frequency, resistance, temperatures and other significant parameters of an application. In this article, we will discuss the application field and working principle of 89771-18.

The 89771-18 is specifically designed as a digital line frequency panel meter for identifying, displaying and monitoring three-phase electrical systems in applications such as motor control centers, transformers, and a variety of other electrical systems. The meter features an adjustable scaling factor that can be used to display the frequency of a three-phase system or to measure the period of the motor supply voltage and accurately calculate the motor\'s speed. Additionally, the range of measurements can be adjusted using a potentiometer, to measure line frequencies from 2 to 20 Hertz with an accuracy of +/- 0.05%. The instrument is designed to perform in any voltage range from 10 to 280 volts.

When it comes to the working principle of the 89771-18, it is based on the RMS (root mean square) method for converting the instantaneous motor speed and voltage measurements to a consistent and repeatable measured value. The measured value is then used to display the motor speed on the digital display of the meter. The motor speed is calculated by counting the frequency of the pulse signals and then using the ratios of the voltage and current signals to calculate the frequency and power readings. This method is highly reliable and accurate in measuring the motor speed and power readings.

The 89771-18 can also be used to measure the AC line voltage of single-phase electrical systems. The meter features a range of voltage from 0 to 500 volts, with the accuracy of +/- 0.25% of the full scale reading. Additionally, the meter also features an automatic adjustment of the display scale for changing supply voltages. This ensures that the readings remain accurate no matter how the supply voltage fluctuates.

Overall, the 89771-18 panel meter is an excellent tool for precise and reliable monitoring of three-phase electrical systems. Its adjustable scaling factor ensures that the measurements remain accurate no matter the voltage range and the motor speed. Additionally, the instrument is highly reliable and accurate when measuring the AC voltage of single-phase electrical systems. In fact, with its precise and reliable readings, the 89771-18 panel meter is ideal for a range of industrial and commercial applications.

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