The Com- Power CLCE-400 Current probe is ideal for those engineers who need to complete Emissions EMC Pre-Compliance testing for requirements of CISPR 22, CISPR 32, DO-160, Mil Std 461 etc, as well as for applied current monitoring during conducted immunity tests.
The RF current probe or EMC Current clamp design incorporates a split-core ferrite in a rugged, circular hinged enclosure; thereby allowing the probe to be opened on one side in order to easily place the wire, cable(s) or cable bundle(s) to be tested into the probe window, making the Com-Power CLCE-400 much more convenient to use than other non-split core probes. Its small size is also convenient for those whom have limited space.
Typically the Current Probe should be used in conjunction with a spectrum analyzer, EMI receiver or or any 50Ω impedance measurement equipment, which measure magnitude quantities in terms of true rms voltage. The Transfer Impedance conversion factor, defined as the ratio of secondary voltage to the primary current, is usually expressed in terms of dB over 1Ω, It is used to convert the voltage quantity into a current quantity, expressed in terms of dB over 1 uA. transfer impedance conversion: [dBuV] - [dBΩ] = [dBuA] The conversion factor may also be derived from the Transfer Admittance value, expressed in terms of dB over 1 S. transfer admittance conversion: [dBuV] + [dB(S)] = [dBuA]
Why Use a Current Probe for Emissions testing?
The Com-Power CLCE400 Current probe is invaluable for measuring high frequency common mode currents flowing on wires or cables. Experience has proven that poorly terminated ( bonded or filtered) cable shields are the number one cause for radiated emissions failures during EMC Pre Compliance Testing. By measuring the CM Currents aka antenna currents on these cables it's possible to troubleshoot and apply fixes to a product direcly in your development lab. With a good degree of accuracy , engineers can predict if a cable current will pass or fail in the measurement chamber thus saving time, money and resources before attending the EMC test house.