Quick Answer: The Portable Analog Wattmeter is a single-phase electrodynamometer instrument for measuring active power, with selectable 75 V, 150 V, 300 V and 600 V ranges and a mirror scale with knife-edge pointer.
Last updated: October 2026
Key Features
Electrodynamometer movement, single phase
Selectable voltage ranges: 75 V, 150 V, 300 V and 600 V
Mirror scale and knife-edge pointer to avoid parallax
Accuracy class 1.0
Frequency range 45 Hz – 65 Hz
Technical Specifications
Specification
Value
Principle
Electrodynamometer, single phase
Voltage ranges
75 V / 150 V / 300 V / 600 V, selectable
Accuracy class
1.0
Scale
Mirror scale, knife-edge pointer
Frequency
45 Hz – 65 Hz
About This Product
A wattmeter measures the real power taken by a load, which is needed to work out power factor and efficiency. In electrical engineering labs it is used on single-phase circuits, transformers and motors, and in pairs for the two-wattmeter method of three-phase power measurement.
Frequently Asked Questions
What voltage ranges does the Portable Analog Wattmeter have?
It has selectable ranges of 75 V, 150 V, 300 V and 600 V.
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