From: not@telling.you   
      
   On 21 Feb 2013, Ian Field wrote:   
      
   > In equipment like a VDU, where there are pulsed currents   
   > above the hearing frequency - electrolytics suffer a lot of   
   > ripple current, the weak ones will get noticeably warm - or   
   > even hot.   
   >   
   > Your sense of touch could save you the cost of an ESR meter   
   > - but the aluminium can isn't isolated, so rail decouplers   
   > on negative rails will be live.   
      
   I presume I could use an infared temperature sensor to do the   
   same job while keeping my fingers out of zapping range?   
      
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