Home gaussmeter with filter-integrator circuit for measuring elf

Details Home gaussmeter with filter-integrator circuit for measuring elf Home gaussmeter with filter-integrator circuit for measuring elf

1991-04-11

1992-09-22

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

324 72, 324 96, 324115, 324122, 324132, 324225, 340600, G01R 3302, G01R 2908, G01R 1510

Patent

active

051500515

ABSTRACT:
A meter (10) for measuring extremely-low-frequency radiation includes a coil circuit (22) whose output is filtered by a sharp-cut-off high-pass filter (24) to pass standard house-current frequencies but suppress the frequency components that would predominate as a result of movement of the meter with respect to the earth's magnetic field. An integrator (26) compensates for the frequency response of the coil circuit (22), an RMS circuit (35) converts the signal to its root-mean-square value, and a display circuit (28) provides a display determined by the resultant signal.

REFERENCES:
patent: 4634969 (1987-01-01), Edlin et al.
patent: 4691165 (1987-09-01), Szedlmajer
patent: 4803421 (1989-02-01), Ostrander
patent: 4837489 (1989-06-01), McFee
patent: 4914382 (1990-04-01), Douville et al.

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