Battery-operated hand field-strength meter and method of null ba

Details Battery-operated hand field-strength meter and method of null ba Battery-operated hand field-strength meter and method of null ba

1996-10-02

1999-03-02

Noland, Thomas P.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

324 98, G01R 2908

Patent

active

058776192

ABSTRACT:
A method of null balancing a hand field-strength meter is described in which the effect of the measurement probe on the balancing is suppressed by short-circuiting the measurement probe by two MOS-FETs connected in series across the probe outputs so that the null balancing can be performed when the field-strength meter is located in the vicinity of a high strength field. In a preferred embodiment of the null balancing circuit for the meter another circuit branch consisting of two other complimentary MOS-FETs connected in series with each other is connected in parallel across the first two MOS-FETs via two resistors R1,R2.

REFERENCES:
patent: 3835380 (1974-09-01), Wobb
patent: 5264798 (1993-11-01), Beg, Jr. et al.

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