The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 05, 1986
Filed:
Jul. 01, 1983
David C Tedd, Folkestone, GB;
David M Kennedy, Hythe, GB;
Thorn EMI Instruments Limited, Dover, GB;
Abstract
A multimeter is provided with two slide switches, one switch providing a selection of four functions, i.e. 'OFF', 'AC', 'DC/JUNCTION' and 'RESISTANCE/CONTINUITY' and the other switch providing a selection of six range settings and a 'JUNCTION/CONTINUITY' setting. The multimeter also has three input sockets for insertion of test leads. At least two of the combinations of the switches and sockets are incompatible, i.e. 'AC' and 'JUNCTION/CONTINUITY', and a current input socket and 'RESISTANCE/CONTINUITY'. An internal buzzer is incorporated in the multimeter to provide an audible indication to a user that an incompatible combination has been selected. The buzzer is preferably also used in junction and continuity test modes.