Hello! I have a Uni-t UT202A+ clamp meter. When measuring current I found that if I move the wire inside the clamp, then the reading changes. The meter is using a current transformer for sensing the current through the measured wire.
I made some tests and I found that, if I measure the current through the wire while powering a 220V AC/1000W heater:
1. With the wire on the upper side of the clamp I=4.710A
2. With the wire on the center side of the clamp I=4.660A
3. With the wire on the lower part of the clamp (the most close to the meters body) I=4.419A
If I just close the clamp against the wire, while powering the same load as above:
1. With the upper side of the clamp I=0.022A
2. With the center side of the clamp I=0.099A
3. With the center side of the clamp I=0.134A
Tested with a UT203R, the value of the current is not varying if I move the wire inside the clamp.
I would like to know if the variations are normal ?
I made some tests and I found that, if I measure the current through the wire while powering a 220V AC/1000W heater:
1. With the wire on the upper side of the clamp I=4.710A
2. With the wire on the center side of the clamp I=4.660A
3. With the wire on the lower part of the clamp (the most close to the meters body) I=4.419A
If I just close the clamp against the wire, while powering the same load as above:
1. With the upper side of the clamp I=0.022A
2. With the center side of the clamp I=0.099A
3. With the center side of the clamp I=0.134A
Tested with a UT203R, the value of the current is not varying if I move the wire inside the clamp.
I would like to know if the variations are normal ?
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