Voltage Test Points FAQ's
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      3. Voltage Test Points FAQ's

      Q: How to determine the Safe-Test Point or ChekVolt voltage readings?

      A.) GracePESD devices have varying resistance across test points, causing voltage reduction.

      The R-3MT (Safe-Test Point) = 102kΩ per point

      The R-3MT-VI (ChekVolt) = 164kΩ per point

      The following formula can be used to find the expected voltage, for accuracy we recommend 10MOhm Multimeter.

      (Meter Resistance / Sum Test point Resistance) x System Voltage = Calculated Reduction Voltage (Expected Meter reading)

      Example "R-3MT":

      (1MΩ / (102kΩ + 102kΩ)) x 480V = 398V

       

      For a more in depth explanation please see our Safe-Test Point High Impedance Technical Note here.

       

      If you require further assistance please contact the Sales Department at Sales@gracetechnologies.com