Voltage measurement instrument having transient overvoltage inpu

Details Voltage measurement instrument having transient overvoltage inpu Voltage measurement instrument having transient overvoltage inpu

1997-11-25

1999-07-06

Do, Diep

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Meter protection or fraud combatting

324142, 324156, 220 402, 174 521, G01R 104

Patent

active

059201886

ABSTRACT:
A voltage measurement instrument such as a digital multimeter is provided with transient overvoltage input protection. Internal walls are integrally molded with the instrument case and disposed in close proximity to the input receptacles and terminals to separate conductive surfaces and provide transient overvoltage barriers. Top and bottom wall portions are fitted together in tongue-and-groove fashion to increase the creepage and clearance path without increasing the linear distance between conductive surfaces. This arrangement also allows the instrument to maintain a low profile.

REFERENCES:
patent: 2930834 (1960-03-01), Hose
patent: 5084670 (1992-01-01), Melenotte
patent: 5166599 (1992-11-01), Hochreuther et al.
patent: 5243275 (1993-09-01), Nakazawa et al.
patent: 5442337 (1995-08-01), Hwang
patent: 5625286 (1997-04-01), Kamiya

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