Solar Electronics Co. 9214-1
CURRENT PROBES Current probes required by various EMI specifications, such as MIL-STD-461/2, are toroidal transformers designed to measure RF currents on active power lines or other conductors. APPLICATION A current probe is used as a pick-up device for measuring RF current in single conductors or cable bundles when connected to the 50 Ohm input of a radio frequency interference measuring receiver or spectrum analyzer. DESCRIPTION Direct connection to the conductor carrying EMI current is not necessary, since the probe can be opened for insertion of the conductor into the window of the toroid and then closed again to form a toroidal transformer, with the conductor acting as a one-turn primary. A correction factor graph is provided to convert measured μV to EMI μA. When the EMI current is measured in dB above 1 μV as indicated on a conventional EMI meter, the correction factor converts the measurement to dB above 1 μA. The correction factor is the inverse of the transfer impedance, Zt. Each probe is shipped with a graph of the correction factor versus frequency, keyed to the serial number on the probe. CLAMP-ON CURRENT PROBE 1.25" (32.0 mm), 20 Hz - 150 MHz
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Solar Electronics Co. 9214-1
