Signal diplayed on CRO without any contact with signal

Discussion in 'General Electronics Chat' started by SSij, Nov 14, 2014.

  1. SSij

    Thread Starter New Member

    Oct 27, 2014
    4
    0
    I found that when my friend was touching on the signal (from signal generator) and I was touching the insulated part of the CRO probe, we got the signal displayed on CRO screen when I touched him. As I was going near him (without touching) signal was displayed with lesser amplitude.
    Can anyone tell me why this happened?
    Thank You
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,014
    3,234
    You bodies both act as antennas (large, somewhat conductive masses). Thus the signal is conducted through the air (either by capacitance coupling or electro-magnetic signal) from your friend to you and then through the probe insulator to the probe tip.
     
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