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Registered Member #1381
Joined: Fri Mar 07 2008, 05:24PM
Location: Hungary
Posts: 74
I'm in search of the possibly "best" Current monitor / Rogowski coil on today's market. My question would be: Is there any alternative to a Pearson Electronics current monitor ? (For pulsed current application. In our experiment, we are trying to measure the current of a 100-200kV "fast" discharge into a load of around 10 ohms, underwater) Ion physics corp, offers similar. But that device's usable risetime for the 20kA range is longer. (preferably 20ns or lower) We also consider the use of Rogowski coil, for it's inherit greater frequency range at the cost of measurement accuracy (sensitivity to conductor placement) and the need for an active integrator.
Jin-Liang Liu, Bing Ye, Tian-Wen Zhan, Jia-Huai Feng, Jian-De Zhang, and Xin-Xin Wang Coaxial Capacitive Dividers for High-Voltage Pulse Measurements in Intense Electron Beam Accelerator With Water Pulse-Forming Line IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, VOL. 58, NO. 1, JANUARY 2009 161
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
Took me a while to recover the odd name to search for: Current Viewing Resistors.
For example, the K-2000-4 from T & M Research Products. 2.5 milliohm shunt, so 10 kA would give you 25 volt output. 48 MHz bandwidth; 8 ns risetime.
E_max = 2000 J, so it could handle an impulse of 800,000 A^2.s (for example, 10 kA for 8 whole milliseconds). If 6 AWG wire can handle the pulse without insulation damage, so can that CVR. I don't know if the CVR also has a current limit due to Lorentz forces.
Years ago I toyed with the design of a high-bandwidth coaxial resistor, using a thin-walled cylinder of stainless steel as the resistive element. A patent search might be in order. A 1/400 ohm shunt resistor must have ESL on the order of 20 pH to have a L/R time constant that short (without frequency compensation). Perhaps compensation is the practical art, just like scope probes. This reference gives some background and ideas.
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Question about precise Current measurement tools (~10kA range)
