Chess board has elastic membrane surface over hollow cavities with pressure sensors connected to start and stop chess clock
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Current transformer arrangement for a solid-state electricity meter
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ACTIVE CURRENT TRANSFORMER
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ACTIVE CURRENT SENSOR WITH PRIMARY REDUCER
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Electronic pulse-width modulation system - has feedback via input transformer with two secondaries
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High rated ratio current instrument transformer - divides current to be measured into two branches, one being current comparator primary used for transformer ratio setting
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Moisture detector using conductivity or capacitance variation - has electrode separation material heating to avoid contamination triggering by residual moisture
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Electronic multiplier with digital input control - uses controlled potential divider with network of series and parallel resistors and electronic switches
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Current measurement transducer with digital output - is suitable for digital wattmeters and uses current feedback comparison technique
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Frequency multiplication in heat energy consumption metering - where frequencies proportional to temp. difference and thermal capacity are multiplied using coincidence stage
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Static operating element for AC electricity meters - has a multiplier which multiplies input current by input voltage
