How is burden measured for the secondary circuit of either a current transformer or potential transformer? Also, is there a test set made for measuring burden?

  • 3
    \$\begingroup\$ What is "burden"? \$\endgroup\$ May 6, 2013 at 20:12
  • \$\begingroup\$ Do you mean burden voltage? en.wikipedia.org/wiki/Multimeter#Burden_voltage \$\endgroup\$
    – jippie
    May 6, 2013 at 20:48
  • \$\begingroup\$ I suspect he means "load" but without knowing "load current" or "load impedance", that's no help. \$\endgroup\$ May 6, 2013 at 20:54

1 Answer 1


The burden voltage of a current meter isn't necessarily measured. A current meter essentially measures the voltage buildup due to a current through a known resistor. It is the voltage drop over the multimeter when measuring current.

The (shunt) resistor in the current meter is a know and static value, so if you know what current flows through it, you can calculate the burden voltage by applying Ohm's Law

The burden voltage in that case is \$U_{burden} = I_{measured} × R_{shunt}\$

  • \$\begingroup\$ This was mentioned in an EEVBlog video and I didn't get it. Now I understand it, +1. \$\endgroup\$
    – Bill
    May 6, 2013 at 23:30

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