How does the intelligent low-voltage monitoring unit resist strong electrical interference in its low-voltage electrical measurement?

For low-voltage electrical measurement, multiple isolation and shielding measures are employed to resist strong electrical interference.

Signal isolation: An ISO7240C isolation amplifier is used, with an isolation voltage of 3kVrms.

Power isolation: A DC-DC module WRB2405S-3W is used.

Spatial isolation: The PCB spacing between low-voltage and high-voltage circuits is greater than 15mm.

Shielding measures: A metal shielding cover is added to the low-voltage section. Shielded twisted-pair cables are used.

Through this design, the strong electrical interference suppression ratio is greater than 90dB, and the accuracy of low-voltage electrical measurement remains at 0.5 class.