Digital measurement transmitter with current signal

Details Digital measurement transmitter with current signal Digital measurement transmitter with current signal

2011-04-19

2011-04-19

Dole, Timothy J (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S522000, C324S600000

Reexamination Certificate

active

07928742

ABSTRACT:
A measurement transmitter, including: A microprocessor having a reset input and a clock output for providing a periodic clock signal; a monitoring circuit having a clock signal input and a reset output; and a current controller for issuing in a band range, during operation, a measurement signal current representing a measured value. The clock signal input is connected with the clock signal output and the reset input with the reset output. Upon absence of the clock signal, the reset output periodically issues a reset signal. The measurement transmitter further includes a comparator circuit having a first input, which is connected via a lowpass with the reset output of the monitoring circuit, and a second input, on which a reference voltage is applied. An output of the comparator circuit is connected with the current controller. After repeated output of the reset signal, the voltage at the first input of the comparator circuit moves above the reference voltage, so that a control signal is then present on the output of the comparator. The control signal causes the current controller to issue an error signal outside of the band range.

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patent: WO 2005/017851 (2005-02-01), None

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