Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-11-01
1978-01-31
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 57R, 324 98, 324123R, 324127, G01R 2704
Patent
active
040718190
ABSTRACT:
A device for accurately measuring the quantative value of the real part of complex impedance without the measurement affecting or being affected by the reactive component of that impedance. The device is useful for impedance matching, and especially for tuning antennaes and the like such that the real part of the impedance can be appropriately matched with the source or receiver during tuning. The device operates by comparing the power delivered to the load with the power dissipated in a resistance R when a current proportional to the main line current passes through it. When both power readings are the same, which may be determined by a null indicator, the real part of the load impedance equals the resistance R.
REFERENCES:
patent: 2797387 (1957-06-01), Adams et al.
patent: 3335368 (1967-08-01), Loughery et al.
Edelberg Nathan
Franz Bernard
Krawczewicz Stanley T.
Murray Jeremiah G.
The United States of America as represented by the Secretary of
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