| 摘要 |
In a voltage measurement apparatus high—i.e. un-attenuated—voltages are connected to an attenuator 12, which then feeds attenuated voltage waveforms to a microprocessor-based analogue-digital converter/voltage measurement circuit 14. A representative digital voltage signal 16 and a synchronising signal 18 are then sent across an optical isolation barrier 20, and are then output to metering circuits 22. The metering circuits 22 receive analogue current inputs 24 which are sampled in synchronism with the digital voltage signals for an accurate measurement of power. Safe outputs 26 are provided which are isolated from any dangerous voltage. |
