| 摘要 |
A meter movement controller has a movable meter vane, in the form of a disk of electrically conductive metal, movable between transmitting and sensor plates of a condenser to vary the transfer of energy between the plates. An SCR is arranged to be connected, in series with a diode, across a low-voltage source of AC potential at commercial frequency, and its anode is connected to the transmitting plate through a further condenser. A voltage divider is connected across the source in series with the diode, and the junction of the voltage divider is connected to the gate of the SCR. When the positive half wave of AC potential reaches a preselected potential, such as 100 volts, a triggering pulse is applied to the gate of the SCR to trigger the SCR conductive. This applies a 100-volt pulse to the transmitting plate of the condenser. A transistor amplifier, including a second SCR, connects the sensor plate to a control means, such as a relay winding. The relay winding is thus energized as a function of the transfer of energy between the condenser plates as modulated as a function of the position of the meter vane.
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