I'm curious how the Fluke i200s current clamp probe can give mV output without the use of batteries. How is this done? If one is measuring 200A I can see how the magnetic field could generate enough current in the probe to support some high-impedance, low-draw circuitry. But when measuring on the low scale, say, 2 or 3 amps, how could the probe output a few hundred mV? (The clamp is spec'd to output 100mV / amp on the 20A low scale, 10mV on the 200A high scale.) Can someone explain this to me? I'm fascinated to see it's possible & curious to know how. Thanks.

ld,eeiousCURIOUSITY KILLED THE CATGO TO SCHOOL AND HEAR IT FROM THE HORSES NOUTHOR GO TO YOUR NEAREST TECHINAL BOOK STORE AND PURCHASE TEST METERSFOR DUMMIESI AM PROTEUS

Batteryless current clamps?

Nov 17, 2009 63 Replies

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James Sweet 16 years ago

My uncle's house (in the US) has a 400A service with current transformers. They're not common but they do exist. IIRC 200A is the largest residential meter.

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John Larkin 16 years ago

It's dangerous to make catagorical statements like "There is no CT in residential metering." It only takes one counter-case to make you wrong.

John

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Michael A. Terrell 16 years ago

Like the claim that no US homes have three phase power that was made on this group (alt.engineering.electrical) a few years ago.

The movie \'Deliverance\' isn\'t a documentary!

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John Fields 16 years ago

He said, with his last breath, and then quietly sank into the sea... JF

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