Digital multimeter having sealed input jack detection arrangement
US7654857B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 2007 |
| Grant date | Feb 2, 2010 |
| Priority date | — |
| Expiry date | May 28, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/125
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A multimeter for testing a plurality of electrical parameters comprises a case having a plurality of test lead jacks. Each of the test lead jacks includes a unitary conductive socket. Preferably, the sockets are made of metal such as brass. A circuit board located in the case has jack conductors in electrical communication with each of the sockets. A jack detection arrangement is adapted to automatically determine whether a plug is inserted into a respective one of the sockets based on a change in electrical characteristics. For example, the jack detection arrangement may include a photonic emitter and a photonic detector situated such that a beam path therebetween is interrupted by insertion of a plug. The case may further have a rotary selector knob for selecting a multimeter function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.