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???
08/21/07 21:15
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 		 #143479 - You still haven't said...
Responding to: ???'s previous message
... what the voltage is unsafe for. Unsafe for the mcu? Unsafe for the opto? Unsafe for the human user?

300V on a small capacitor is also 300V dc but in no way unsafe. Taking off your sweater creates higher voltages. But there is little power in it.

OTOH a static discharge might damage the mcu. But with a resistor divider and some capacitance which also filters noise I doubt it will.

List of 34 messages in thread
TopicAuthorDate
high voltage measurement            01/01/70 00:00      
   it all depends            01/01/70 00:00      
   Unsafe?            01/01/70 00:00      
      and unsafe it is            01/01/70 00:00      
         Just how unsafe?            01/01/70 00:00      
            Looks interesting (PC isolation)..            01/01/70 00:00      
   voltage range            01/01/70 00:00      
   Obvious?            01/01/70 00:00      
      Better have an optocoupler burn out than uC            01/01/70 00:00      
         Well, yes, but ...            01/01/70 00:00      
         Why?            01/01/70 00:00      
            why to let things burn out in first place?            01/01/70 00:00      
               You still haven't said...            01/01/70 00:00      
                  I think ...            01/01/70 00:00      
                     Right            01/01/70 00:00      
                        And that should have been obvious?            01/01/70 00:00      
   High-voltage isolation            01/01/70 00:00      
      Sure.....Thanks            01/01/70 00:00      
      Sadly            01/01/70 00:00      
      Avago tech            01/01/70 00:00      
         unsafe and burn            01/01/70 00:00      
   Isolation Techniques            01/01/70 00:00      
      Commercial Product            01/01/70 00:00      
         commercial products like?            01/01/70 00:00      
            It depends where you are            01/01/70 00:00      
               Also current measurement            01/01/70 00:00      
                  More details please            01/01/70 00:00      
                  9916340000            01/01/70 00:00      
                     Thanks            01/01/70 00:00      
      what about            01/01/70 00:00      
   You could use any opto to do this            01/01/70 00:00      
      M Chitrakar: what is the volume what's the range            01/01/70 00:00      
      HCNR201 and IL300F could also be used            01/01/70 00:00      
   This is how I managed high voltage measurements.            01/01/70 00:00      

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