Multimeters

Details Multimeters Multimeters

1983-07-01

1986-08-05

Levy, Stewart J.

Electricity: measuring and testing

Plural, automatically sequential tests

324110, 324115, 340540, G01R 1512

Patent

active

046045694

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.

REFERENCES:
Barker, R. et al., "Contemporary Design Practice in General-Purpose Digital Multimeters", Hewlett-Packard Journal, vol. 28(6), Feb. 1977, pp. 20-27, Hioki E.E. Corp., Catalog No. 3207E, Jan. 1980.

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