XPost: at.home.repair, uk.d-i-y   
   From: junk@admac.myzen.co.uk   
      
   On 11/05/2019 19:54, Commander Kinsey wrote:   
      
      
   >   
   > I know the multimeter is accurate, I've tested it on all sorts of things.   
      
   The only way you will know that your multimeter is accurate is by having   
   it calibrated against a known standard, ideally specified to 10x better   
   than your meter.   
      
   At 0.65A a high end Fluke multimeter @ £200+ will give 0.65A +/- 0.01A   
   on a typical £50 multimeter £50 it will give 0.65A +/-0.09A   
      
   Without a specification for what you have purchased, you may have meter   
   capable of measuring fairly accurately currents in the range 100A to   
   1000A but not capable of 0 to 10A measurements with any degree of accuracy   
      
   Typically you may be trying to measure and compare a 0.65A current with   
   measuring equipment with a total uncertainty of measurement of around 0.6A   
      
    > The 8.5A was measured both with one of those energy efficiency meters   
    > on my house's meter tail, and by knowing what devices were running.   
      
   So your comparison standard is something British Gas used to give away   
   for free, possible so inaccurate that it hasn't got a published   
   specification for its current measuring capability.   
      
      
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