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Tip 9: Making AC Current Measurements
A multimeter uses a known internal resistance to create a voltage, which can be measured and converted to a current reading. In addition, the multimeter may have a fuse and switching circuits adding additional resistance to the current path. The voltage dropped created by the multimeter's current measuring circuit is specified as the burden voltage. The burden voltage for an ac current is often larger than a dc current due to the multimeter's series inductance and your measurement connections. The burden voltage increases as the input frequency increases. It is possible to create a circuit that oscillate when performing current measurements due to the multimeter's series inductance and your measurement connections.