Products > Test Equipment
Brymen, difference in reading between mA and uA scale
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Kim Christensen:
Many people have already explained it, but this effect is true for measuring anything in the real world. It's called the observer effect.
EEVblog:

--- Quote from: J-R on August 14, 2023, 07:14:06 pm ---I don't see enough of a difference between the shunts used in the BM869s and the BM789 to outright state the BM789 is more accurate, and as I mentioned in my testing I did not see a visible indication that the BM789 was any better than the BM869s.  If the uA shunt was truly 200 Ohms like the manual states, then that would be a bigger difference compared to 100 Ohms.

--- End quote ---

Mine are both identical:
Fungus:
I just realized my Brymen BM857s has better current measurement specs than the BM869s.  :)

(it's probably no better in practice, but...)
LazyJack:

--- Quote from: MarioBros69 on August 14, 2023, 08:46:50 am ---
Maybe I expressed myself wrong, by real current I meant the current that flows through the circuit when I am not measuring

--- End quote ---

You still don't understand. The meter is part of the circuit. If you are not measuring and substitute the meter with a short then it is a different circuit with different current. Please draw the circuit for yourself and using Ohm's law calculate the current for the different scenarios.
sonpul:
I think he understands this. He doesn't understand why you can't make relative measurements like the REL button. Subtracting the resistance of probes, input capacitance, etc. It looks like he would like to automatically offset the display using Ohm's law.
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