Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1974-12-18
1976-04-13
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 2700
Patent
active
039506975
ABSTRACT:
A device for measuring parameters of a dynamic object, in which device the output of a source of periodic oscillations with a dynamic object connected thereto is electrically coupled via a switch to the input of a regulable phase shift unit whose output is connected to a first input of a difference signal unit with a regulable amplification factor at one of its inputs, and to a second input of said difference signal unit whose output is electrically connected to an indication unit. With the switch being in its first position, the output of the dynamic object is connected to the second input of the difference signal unit, whereas the output of the source of periodic oscillations is connected to the input of the regulable phase shift unit, which makes it possible to measure the phase shift of the dynamic object within a range of 0.degree. to -180.degree., as well as to take measurements of the speed of response, the ratio between the electric signal amplitudes at the output and input of said dynamic object, and the capacitance and inductance of its components. With the switch being in its second position, the output of the source of periodic oscillations is connected to the second input of the difference signal unit, whereas the output of the dynamic object is connected to the input of the regulable phase shift unit, which makes it possible to measure the phase shift of signals at the input and output of said dynamic object, which is in excess of 180.degree., as well as frequency values of the source of periodic oscillations.
REFERENCES:
patent: 3612993 (1971-10-01), Tims et al.
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