Patent ID: 9625558
Date: 2017-04-18
CPC Classifications: G01R,G05B

Claim:
1. A duplex system measuring and outputting at least voltage or current, the duplex system comprising: a first measurement device measuring at least the voltage or current to generate a first measurement value; a second measurement device measuring at least the voltage or current to generate a second measurement value; a control device outputting the first measurement value or the second measurement value, the control device disconnected from the first measurement device and performing a changeover from the first measurement device to the second measurement device when a difference between a present first measurement value and a previous first measurement value is equal to or greater than a predefined reference value or the first measurement device stops measuring voltage or current values; and a filter filtering the second measurement value based on the first measurement value to decrease a difference between the first measurement value or second measurement value output by the control device before the changeover and the first measurement value or second measurement value output by the control device after the changeover.