Rosemount Engineering Company Limited

Timothy D Price

A circuit provides electrical isolation from an input signal which has a leading edge and a trailing edge. On the leading edge of the input signal, a first signal is transmitted across an isolation device to provide a first isolated signal representative of the leading edge of the input signal. On the trailing edge of the input signal, a second signal is transmitted across the isolation device to provide a second isolated signal representative of the trailing edge of the input signal. The first and second isolated signals are electrically isolated from and representative of the input signal.

Electrical isolation circuit

Clock-controlled dual slope voltage to frequency converter has an integrator supplying a charging ramp to a threshold detector. The slope of the ramp depends on the input voltage to the integrator and the threshold detector is triggered by the ramp to enable a pulse from a clock to generate a constant current discharge pulse. The discharge pulse is fed to the integrator to produce a discharge ramp back below the threshold. The frequency output is taken from the output of the threshold detector to be synchronous with triggering of the detector.

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Bognor Regis, United Kingdom

Timothy D Price