From: curd@notformail.com   
      
   On Sun, 26 Aug 2018 08:33:46 +0100, Terry Pinnell wrote:   
      
   > Thanks, very helpful. Continuing testing today.   
      
   I had the same thing happen with an old Advance RF sig gen I owned about   
   40 years ago. It was fine for years then suddenly started outputting 115V   
   on the sig-out socket that was supposed to be 1mV-1V! Blew a lot of   
   transistors before I discovered the fault, 'cos I have very high skin   
   resistance and couldn't feel it. One particularly dull day I noticed a   
   tiny spark jumping from the probe tip to the DUT and on further   
   investigation discovered the high V output. The Earth connection to the   
   metal case should have prevented this, but the previous owner (a ham   
   radio operator) had for some bizarre reason inserted an insulating bush   
   between the Earth tag and the chassis!   
   This may or may not help you but it just reminded me how stupid some   
   (supposedly intelligent) people can be.   
      
      
      
      
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