Register 1,Highest technology and best quality,10:1 to 1000: 2,Number:6+1 3,Current: 10(120A). 4,ISO9001: 2008. RegisterKey Technical IndexJD series Electronic Type Counter for Electric Energy Meter1. Pulse ratio specification: 10: 1 20: 1 40: 1 80: 1 100: 1 200: 1 400: 1 800: 11000: 12. Start-up work voltage no greater than: 2.8v3, Normal working voltage: 3.5v to 6.5v4, Pulse width: 70 to 320ms5 ...