Portable Analog Wattmeter

The Portable Analog Wattmeter is an electrical measuring instrument used to measure electrical power in a circuit. Manufactured by Elmo Agencies, a trusted scientific manufacturer in Ambala, it provides an analog pointer indication of power through a calibrated scale, making it suitable for laboratory experiments, electrical testing, and educational demonstrations.

A wattmeter measures the electrical power consumed or delivered by a circuit. A traditional analog wattmeter generally uses a combination of current and voltage measuring elements to determine power. The interaction of these elements produces movement of the instrument’s pointer, which indicates the power value on the calibrated scale.

Rated Accuracy: ± 1.0% of full scale value as per ISS 1248/84 between 10% to 100% of the scale for Single phase UPF Wattmeters
: ± 1.5% of full-scale value as per ISS 1248/84 for Three Phase Wattmeters
: ± 1.5% of full-scale value as per ISS 1248/84 for 0.2 P.F. (LPF) Single Phase Wattmeter
: ± 3° (Electrical) as per ISS 1248 for Power Factor Meters

Note: All Wattmeters are calibrated at cos f = 1 and Varmeters at sin f = 1
All low power factor wattmeters are calibrated at cos f = 0.2 lag
Other voltage and current ranges can be supplied on request, subject to technical feasibility

Working Principle

An analog wattmeter operates using two measurement circuits:

• Current coil: Connected in series with the load to respond to the current flowing through the circuit.
• Voltage coil: Connected across the load to respond to the voltage.

The interaction between the magnetic fields produced by these coils generates a deflecting torque. The resulting pointer movement provides an indication related to the real electrical power being measured.

Key Features

• Analog pointer-based power measurement
• Designed for electrical power measurement
• Portable construction for convenient use
• Calibrated scale for direct visual readings
• Suitable for laboratory and educational applications
• Useful for practical electrical testing

Applications

The Portable Analog Wattmeter can be used for:

• Electrical power measurement experiments
• Physics and electrical laboratory work
• Educational demonstrations
• Electrical testing and practical training
• Circuit and load measurement studies
• Technical and vocational education

Advantages

The analog display provides continuous visual feedback of the measured power, allowing users to observe changes as the electrical load or operating conditions change. Its portable format also makes it convenient for different laboratory and testing arrangements.

Conclusion

The Portable Analog Wattmeter by Elmo Agencies provides a practical method for measuring electrical power using an analog pointer and calibrated scale. It is designed in a portable format, making it convenient for use in laboratory work, practical electrical experiments, and testing applications where the instrument may need to be moved between setups.