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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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OT My second electric bike
On Tuesday, June 14, 2016 at 8:17:56 PM UTC-4, Clare wrote:
On Tue, 14 Jun 2016 15:01:58 -0700, Gunner Asch wrote: It SAYS 40 and 400 amp DC ranges -That has to be with the clamp. I will definitely find out. If it has plastic covered jaw ends I'll know without testing. Inductive pickups NEED bare steel core ends. Huh? Not really. In fact...most amp meters..inductive type...have plastic covered jaws. Just saying. Inductive clamps NEED a metal to metal core connection to close the magnetic circuit of the core.. Some clampons may use a Rogowski soil which has no core - but I have not seen one in a consumer grade or trade level meter - might be used in lab quality stuff for better linearity with no core to saturate.AC transformer coils have to be made of laminations or ferrite - solid iron doesn't work very well - and the only time an air gap is used in a transformer is to prevent saturation when there is a DC component in the power. Most AC clampmeters can not give anywhere near accurate results with the clamp not fully closed, while a hall efect sensor REQUIRES a gap in the magnetic circuit. Every insuctive clamp I have ever seen - for ammeters, tachometer pickups, or timing lights - have exposed cores - and they don't work worth squat if the jaws cannot close fully. I've heard that the idea is to get the proper magnetic field reading from the live cable/wire which helps determine amperage with ammeters, not "amp meters". |
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