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Kai Klaas
04/27/12 07:31
  04/27/12 07:32

Read: 395 times

#187257 - Not so simple...
Responding to: Raghunathan's previous message
Raghunathan said:
What I want to know is this: Can I rig up a step down transformer, say 230/24V and connect an oscilloscope( I have a 20Mhz one ) to the secondary. Now in the same mains socket I create 'noise' by having a CF lamp and switch it on/off by touching the lead wires instead of a switch.

Dear Raghunthan,

mains filters are tricky. They do not only suppress noise over a hf band but can even increase it at lower frequencies. In any case a mains filter needs enough dampening of resonances which is normally provided by the flow of enough load current.

So, you would need two identical setups, both containing your original PC based data aquisition system, one with and the other one without the additional mains filter. Keep anything else identical. Now introduce your "noise" and look what happens...

Kai Klaas

List of 9 messages in thread
EMI / RFI Suppression visuals !!      Raghunathan      04/26/12 04:18      
   50:50      Stefan KAnev      04/26/12 12:27      
   try replacing the PC with another brand      Erik Malund      04/26/12 15:10      
   Not so simple...      Kai Klaas      04/27/12 07:31      
      One possible way to test ?      Raghunathan      04/27/12 10:57      
   one question      Erik Malund      04/27/12 07:58      
      Signals totally isolated      Raghunathan      04/27/12 10:51      
         I was thinking CMRR, but      Erik Malund      04/27/12 13:33      
         could it be ...      Erik Malund      04/27/12 14:06      

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