The conventional current transformer does not measure DC currents.
There are some DC current probe designs that use the nonlinear properties of a magnetic material to measure DC currents.
Some current probes use Hall effect sensors to measure the magnetic field around a wire produced by an electric current flowing through the wire without any need to cut or interrupt the wire. They are available for both voltmeters and oscilloscopes. Most current probes are self-contained, drawing power from a battery or the instrument, but a few require the use of an external amplifier unit. (See also: Clamp meter) http://en.wikipedia.org/wiki/Test_probe#DC_current_probes
The TCP300 and TCP400 series AC/DC Current Measurement family is a highly advanced current measurement system for today's current measurement needs. The split-core probes incorporate both transformer and Hall-effect technology to provide broad bandwidth measurement capabilities from DC up to 100 MHz at current levels as low as 1 milliamp to thousands of amps (when used with CT4 current transformer). When connected to Tektronix Oscilloscopes with TEKPROBE Level II, TekConnect (w/ TCA-BNC) or TekVPI (w/ TPA-BNC) interfaces, current measurements and calculations are simple and easy. http://www2.tek.com/cmswpt/psdetails.lotr?ct=PS&ci=13540&cs=psu&lc=EN
This model is: TCP303 with TCPA300
Current Location: 36-288
Vendor: Tektronix
Specifications: Datasheet
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