Metal detector sensitivity adjustment and test assembly

Details Metal detector sensitivity adjustment and test assembly Metal detector sensitivity adjustment and test assembly

1984-08-27

1987-01-27

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Calibration

56 102, 324239, 340551, G01R 3500, G01N 2772, A01D 7518

Patent

active

046396667

ABSTRACT:
The metal detector circuitry for a forage harvester is provided with a socket for receiving a pluggable unit, the arrangement being such that a resistor in the pluggable unit is connected into the detection circuitry of a metal detector whereby the sensitivity of the metal detector may be changed by inserting into the socket a pluggable unit containing a resistor of a different value. A metal detector test assembly connected to the metal detector through the socket, provides a means for testing the sensitivity of the metal detector and its associated circuitry. The test assembly includes a signal unit which is placed adjacent the metal detector sensing unit and generates a magnetic field that is sensed by the sensing unit, and a test box with circuitry, indicators and switches for selectively checking the sensitivity of the metal detector and correct operation of its associated circuitry.

REFERENCES:
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patent: 4288748 (1981-09-01), Kaye et al.
patent: 4433528 (1984-02-01), Bohman
Nakane et al, "Standard Magnetic Field Radiated . . . in a Coplane"; CPEM 82 Digest; Conference on Precision Electromagnetic Measurements, Boulder, Colo. USA, Jun. 28-Jul. 1, 1982, pp. 5-7.
Instructions for Metal Detector Test Set IMDTS (Harvester)-150-579P.
Operator's Manual with Assembly Information, Forage Harvester 892 Electronic Metal Detector, Sperry New Holland, 1982.

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