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How can I check the operation of a Vigilohm XM200?

To check that a Vigilohm XM200 is operating correctly:
  • Disconnect terminal 4 from the line supply (value indicated: 999).
  • Connect terminal 4 to terminal 11. If R=0 then the Vigilohm is operating correctly.
  • If R=999 and remains displayed permanently, the Vigilohm XM200 is faulty.
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