Battery-operated hand field-strength meter and method of null balancing same
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United States of America Patent
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Mar 2, 1999
Grant Date -
N/A
app pub date -
Oct 2, 1996
filing date -
Oct 4, 1995
priority date (Note) -
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status (Latency Note)
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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.
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