Method and circuit for producing an input variable for a cross-c

Details Method and circuit for producing an input variable for a cross-c Method and circuit for producing an input variable for a cross-c

1990-08-24

1992-03-17

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Suppressed zero

324144, 324167, G01R 1510, G01R 120

Patent

active

050972030

ABSTRACT:
A method of producing an input variable for a cross-coil indicating instrument from a measurement signal is disclosed in which the frequency of the measurement signal is converted into a frequency-proportional input current for the cross-coil indicating instrument (11). Furthermore, a circuit is disclosed in which an input terminal for the measurement signal is connected to a period measuring device (3, 4, 5) the output of which is connected to a divider (6). The output of the divider feeds a control variable which is proportional to the frequency of the measurement signal (f.sub.M) to an input (13) of a processing circuit (8, 10). The known method and the known circuit have the disadvantage that, in case of a low frequency of the measurement signal, a jerky movement of the pointer of the indicating instrument (11) can be observed. In order to eliminate this jerky movement, an input current which brings the cross-coil indicating instrument 11 to a predetermined value, independent of the actual frequency, is produced below a predetermined first frequency value of the measurement signal.

REFERENCES:
patent: 3068406 (1962-11-01), Dellinger
patent: 4841238 (1989-06-01), Birch

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