Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Casings
Patent
1980-04-22
1984-03-27
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Casings
324 73R, 324115, 73431, G01R 104, G01R 1512
Patent
active
044397267
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a portable multimeter having an indicating subassembly for visualizing the measured value of a measuring variable to be examined, a processing subassembly for converting or adapting the measuring variable, separate housings for the subassemblies being connected to each other in such a way that they can be folded together in a rest condition, and control and indicating parts to be protected which come to lie toward the inside.
If one disregards the electrical properties of a multimeter, good readability, convenient handling and ruggedness of special importance to the user.
Good readability requires a large indicating area for displaying the measured value. At the same time the indicating area should be arranged so that the viewer can occupy a nearly perpendicular direction of view thereto without contortions.
Convenient handling necessitates, for one thing that the measuring instrument is light and handy and that it can be taken along without difficulty to various work stations. Furthermore, the individual control elements must be highly accessible.
Ruggedness is required in a multimeter if only for the reason that it must be transported frequently. Sensitive parts such as those made of glass must not break and the indicating and control elements must not get dirty.
It is self-evident that not all of the mentioned requirements can be fulfilled without difficulty since they necessitate in part divergent measures. Thus, a large indicating area can be realized in a small handy measuring instrument only with difficulties. Also the requirement for ruggedness to mechanical stress during transport can be met only by measures which lead to a larger measuring instrument. This applies to the use of protective cases which, in addition, are almost always in the way, as well as to the use of a cover which can be hinged over the elements to be protected.
It appears at first obvious to construct a multimeter, similar to that described in German Published Nonprosecuted Patent Application 2 636 079 in such a manner that parts of the measuring instrument are accommodated in a cover-like flap which can be swung out. From German Published Nonprosecuted Patent Application 2 458 766 it is furthermore known to subdivide a measuring instrument in such a manner that an indicating subassembly with the measuring mechanism and scale as well as a processing subassembly with measuring range selector and amplifier are created.
A foldable multimeter, in which the indicating subassembly is mounted in the cover would have considerable advantages over equipment of conventional design. For transport, such an instrument could simply be folded so that the then inner control and indicating elements would be protected by the outer housing parts. It would be an additional advantage that when the instrument is folded out, the control and indicating areas together would be twice as large as its base area. The originally contradictory requirements for a large indicating area and ruggedness on the one hand, and easy handling on the other hand, can therefore largely be met in this manner.
Although the idea to design a foldable multimeter may be self-suggesting, the practical construction of a really handy and practical instrument presents considerable problems, the solution of which is an object of the invention. In particular, it is an object of the invention to provide a portable multiple measuring instrument which is of flat design with rounded external corners so that the folded instrument can be put in a trouser pocket if necessary. The housing of the measuring instrument must be designed so that with small external dimensions, the interior is well utilized and at the same time, favorable conditions for reading and operating the measuring instruments are obtained.
This problem is solved in a portable multimeter comprising an indicating subassembly for visualizing a measured value of a measuring variable to be examined, a processing subassembly for converting or adapting the measuring variable, separate housings for the sub
REFERENCES:
patent: D241726 (1976-10-01), D'Antonio
patent: 3829773 (1974-08-01), Nigg
"Compact, `Diary`, Checkbook, All Count" 5/1975, Electronics, vol. 48, No. 7, pp. 40-41.
Heinze Siegfried
Hochreuther Karl
Scholpp Werner
Brown Boveri & Cie AG
Greenberg Laurence A.
Lerner Herbert L.
Snow Walter E.
Strecker Gerard R.
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