Measuring device for the accurate adjustment of the start-of-mea

Details Measuring device for the accurate adjustment of the start-of-mea Measuring device for the accurate adjustment of the start-of-mea

1983-03-28

1986-07-29

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Using radiant energy

324133, G01R 3100, G01R 1900

Patent

active

046032940

ABSTRACT:
A measuring device for the accurate adjustment of the start-of-measurement of a measuring transducer of two-conductor design is disclosed. The measuring device disclosed is of simple design, can be produced inexpensively and is highly accurate. In one embodiment of the measuring device, a pickup resistor is arranged in series with the measuring transducer. The input of a multivibrator is coupled to the pickup resistor. The duty cycle of the multivibrator changes as a function of the voltage at its input. The duty cycle is 1:1 for a current through the pickup resistor corresponding to the start-of-measurement. The multivibrator is coupled to a circuit having two light-emitting diodes which can be fed from the current flowing through the measuring transducer and which light up with equal brightness when the duty cycle is 1:1. The measuring device can be used with all measuring transducers of two-conductor design. In a further embodiment, the measuring device includes a differential amplifier arrangement having outputs coupled to a circuit having two light emitting diodes which light up with equal brightness when the start of measurement is attained.

REFERENCES:
patent: 2916670 (1959-12-01), Pederson
patent: 3076901 (1963-02-01), Rubin et al.
patent: 3576523 (1971-04-01), Lerbakken
patent: 3626289 (1971-12-01), Vinson et al.

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