From: andrews@sdf.org   
      
   Hi all   
      
   I've recently picked up an old Weir bench PSU and recalibrated it   
   to within quite sharp tolerances.  However, the front panel meter   
   (switchable between voltage and current, although the schematic   
   shows it is working as voltmeter in both modes) reads accurately,   
   but the settling time must be a good 10-15 seconds before it stops   
   oscillating back and forth.   
      
   I haven't got as far as pulling the meter out yet but I expect   
   obtaining a compatible replacement will be difficult.  Looking at   
   online it seems most practical sources sources address electrical   
   damping for brief transients in the signal, this is rather the   
   mechanical side of things.  Basic research suggests pneumatic   
   damping is the usual order of the day but I haven't found anything   
   relating to actual maintenance and adjustment.   
      
   Does anyone have practical experience or is a replacement meter   
   the usual approach?   
      
   --   
   Andrew Smallshaw   
   andrews@sdf.org   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)