On Tue, 12 Jul 2005, vasile surducan wrote: > On 7/8/05, Peter wrote: >> Afaik Rogowski coils are used to measure and scope the pulses in kA >> and nanosecond ranges. > > Peter, aren't you just a little bit too optimistic ? Compute what it > means 1kA variation (let's be humans, 0.1kA it's enough) in 1nS. Then > think where may appear such variation into the real world. I read about measuring lightning current in a lightning rod grounding system using Rogowski coil(s). Maybe nanoseconds is a little fast, say 10nsec and above. 100kV, 10nH and 10nsec go together, no ? 10nH should be the inductance of a few cm of wire or a spark gap ? > A Rogowski coil can be configured as an unshielded >> untwisted pair transmission line, terminated properly, and wound >> edgewise on the conductor to be analyzed. The result is more or less >> like a directional coupler with several windings. Afaik it has no upper >> frequency limit at all. > > Again, optimistic. Adapting is never an ideal concept. That's why the > VSWR was defined. So you know the VSWR and can calibrate it out ? Peter -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist