Portable electro-magnetic field detection and measurement appara

Details Portable electro-magnetic field detection and measurement appara Portable electro-magnetic field detection and measurement appara

1995-04-13

1998-06-30

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Magnetometers

324260, 324133, 340600, G01R 3302, G01R 2908, G01R 1300

Patent

active

057739749

ABSTRACT:
Apparatus for detection of the electro-magnetic field and measurement of its strength in the near field. The apparatus includes an antenna suited to receive specified type of the electro-magnetic field; a detector to convert received signal into DC voltage, a summing device and a potentiometer to set the reference level, a DC amplifier for amplification of resulting signal. The apparatus further includes a voltage-controlled oscillator and a speaker that produces an audible tone with the pitch proportional to the field strength. The apparatus further includes a squelch circuit that blocks the sound when the field strength gets lower than the preset range. The apparatus further includes LED level bar as visual means of indicating field strength. The apparatus is constructed as a fully self-contained unit needing no additional equipment for its operation.

REFERENCES:
Hewlet-Packard Data Sheet For HP8590 Spectrum Analyzer (1994 Catalog, pp. 242 & 244).
EMCO Data Sheet For 7405 Probe Kit (1994 Catalog, p. 18).

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