Patent ID: 6091237
Filing Date: 2000-07-18
Classification: G01R

Abstract:
A clamp-type power meter for measuring three-phase electric properties, comprising:a main body having a shape adapted to be held by hand during operation of said power meter;a clamp assembly formed at one end of the main body to clamp around an external power line to measure a current flowing in the power line;a first test terminal and a second test terminal provided at another end of the main body to electrically connect two external power lines to measure a voltage across the two external power lines;an operating unit with a memory unit connected to the clamp assembly, and each of the first and the second test terminals for calculating a result from current and voltage data being measured and storing the result in the memory unit, said memory unit having a plurality of instruction messages pre-stored therein for use in measuring three-phase electric properties; anda display unit provided on the main body and connected to the operating unit to display at least one of the current data, the voltage data and the result, wherein the main body is provided with a key connected to the operating unit for storing the result in the memory unit and displaying an instruction message from the plurality of instruction messages on the display unit to prompt a user for further measurements.