Dear friends, I wanted to know the procedure for high voltage spike measuement. i.e, consider my source is 230v supply and I'm using some step down transformer to convert it into 5v as my ADC is 5v ADC and then I measure the voltage fluctuation by digital processing on acquired data. Now my problem is if sudden 1-2 kv voltage spike is there on 230v supply then how to measuer it? as if I feed the signal through same channel as 230-5v conversion Transformer then that 1-2 kv will convert into 400v or somewher near but 400v is too high for my ADC. so can u please help me to find out general idea to do it. u can mail me to my id.