Products > Test Equipment
Aliexpress bargain alert- WinApex 268B AC/DC clamp meter
Fungus:
Not always practical, but:
You can also wrap the wire around the clamp a few times and get more accuracy that way.
eg. wrap it around 10x and divide the result by 10.
Martin72:
--- Quote from: mikeselectricstuff on July 14, 2024, 08:46:42 pm ---After measuring, power off and verify that the reading returns to zero.
--- End quote ---
In this context, I am somewhat surprised that even higher-priced current clamps do not use the compensation method that prevents the core from magnetizing (at least as long as the current clamp is not "overrun").
Aldo22:
--- Quote from: Fungus on July 14, 2024, 09:27:48 pm ---Not always practical, but:
You can also wrap the wire around the clamp a few times and get more accuracy that way.
eg. wrap it around 10x and divide the result by 10.
--- End quote ---
Thank you, that helps with low currents. :-+
What bothers me about my ANENG ST212 is that it does not display a stable value.
It constantly changes the measurement display, e.g. in the range from 0.95A to 1.05A, without changing anything in the measurement setup.
These measurements are probably even in the specified range ± (2.5% +8d) for DC current, but difficult to read in this way.
With averaging, the measurement might quite accurate. But the way it is, you have to estimate from the changing values.
But at least it is "honest" and shows you the uncertainty. ;)
The WinApex 268B seems a bit more stable.
Phil1977:
If you want to have a look inside:
The cyan clamp housing is glued so I couldn't get a glimpse on the magnetic sensor. The thin green wire going from the main IC blop to the clamp is probably the NCV antenna.
There are two trimming potentiometers - so maybe recalibration of the clamp is feasible.
A small annoyance is that the "ZERO" button only works in DC amps.
wasedadoc:
--- Quote from: Phil1977 on July 15, 2024, 08:43:07 am ---
A small annoyance is that the "ZERO" button only works in DC amps.
--- End quote ---
The zero button on any clamp meter is to subtract the ambient magnetic field. Earth's field and nearby magnetised objects. That should be a steady offset. When measuring AC that offset is removed by an AC coupling or software. Have you ever seen a "zero" button on a clamp meter which does not measure direct current?
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version