While I am familiar with DLROs what I am looking for I can't seem to find. What I want to do, using a kelvin configuration is measure in a range of 20 (19.999) Ohms with a current of 1 amp. I can find ranges like that and down to mΩ but a range like 19.999 Ohms with 1 Amp is something I can't find. Even a 1.999 Ohm range would be fine.
The goal here is to have receiving inspection remove about 10 feet (OK 10" +/- 1") from new spool of AWG 16.5 wire and measure it. We wind motors, very unusual hand built motors. The problem is we use a coil winding machine to make the coils (think 700 feet plus) of continuous copper enameled wire. This leaves a hell of a lot to go wrong. If the tension isn't monitored the wire can get stretched. But lately we have a new problem. We are supplied by Essex and another wire manufacturer. Lately we get wire that is not in specification. The ***** is they are winding using it and we don't know till the finished coils are checked.
Screw source inspection and all that. I want them (receiving inspection) to draw 10 feet off the beginning of a spool and measure it before we scrap 700 feet of wire plus the setup time and time to wind the coils.
Currently when the coils fail the engineer in coil wind drags the junk to me so I can hand it to a lab technician and have them run 1.0 amps from a DC Lab Standard through the stuff and use a lab bench meter to to measure the IR drop. This is getting old real quick. Additionally the wire temperature is allowed to get stable, the temperature is recorded and correction factors are applied.
I have looked at Biddle (Megger) and other manufacturers but can't find that damn 1 amp. Not for the range I want anyway. I am guessing a price range in the 2K to 3K USD. If anyone has any ideas other than build one I would love to hear them as to a manufacturer.
Thanks
Ron
The goal here is to have receiving inspection remove about 10 feet (OK 10" +/- 1") from new spool of AWG 16.5 wire and measure it. We wind motors, very unusual hand built motors. The problem is we use a coil winding machine to make the coils (think 700 feet plus) of continuous copper enameled wire. This leaves a hell of a lot to go wrong. If the tension isn't monitored the wire can get stretched. But lately we have a new problem. We are supplied by Essex and another wire manufacturer. Lately we get wire that is not in specification. The ***** is they are winding using it and we don't know till the finished coils are checked.
Screw source inspection and all that. I want them (receiving inspection) to draw 10 feet off the beginning of a spool and measure it before we scrap 700 feet of wire plus the setup time and time to wind the coils.
Currently when the coils fail the engineer in coil wind drags the junk to me so I can hand it to a lab technician and have them run 1.0 amps from a DC Lab Standard through the stuff and use a lab bench meter to to measure the IR drop. This is getting old real quick. Additionally the wire temperature is allowed to get stable, the temperature is recorded and correction factors are applied.
I have looked at Biddle (Megger) and other manufacturers but can't find that damn 1 amp. Not for the range I want anyway. I am guessing a price range in the 2K to 3K USD. If anyone has any ideas other than build one I would love to hear them as to a manufacturer.
Thanks
Ron
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