Hi, today i try to mausere current flow with my Xl830l multimeter. I put 5k ohm and measure current with 9v power adepter. Result is 200 ma. Then i measure 1k 2k so go on. Result is proportional to resistor as expected but 100 times higher:) my multimeter measure voltage and ohms correctly. Is this weird? My multimeter only maesure current wrong?
Thank you
11.2k ohm, 5v, expected current 0.44 ma ,result correct mode:2m
11.2k ohm, 5v, expected current 0.44 ma ,result wrong mode:20m
9.2k ohm, 5v, expected current 0.54 ma ,result compeletly wrong mode:200m
9.2k ohm, 5v, expected current 0.54 ma ,result wrong mode:20m
11.2k ohm, 5v, expected current 0.44 ma ,result wrong mode:200m
above 2 mA current i always get 1 (over threshold) value in all modes.in other word i cant see any value lower than 4.7 k ohm resistor(1k,2k,3k etc)
No,
You need to break the circuit and insert your current meter between the brakes.
thanks for reply. but i am quite familiar with circuits. i do know how to use . just maybe there is trick that i dont know.
Are you mixing up the reading of the colour code on your resistors and they are not what you think they are?
Check with your multimeter the value of your resistor matches what you expect them to be.
i also check with multimeter measurement. it is correct. moreover it is hard to believe i understand you, thats why i added photo. check pls!
So you added extra information to the original post. I find it hard to believe you did that, especially as it is against the forum rules.
That is why I never saw the pictures.
It is not unusual for beginners to miss-read a resistor.
You may want to read this before you proceed:-how to get the best out of this forum
Yes I could miss read resistors. I update post because I want show everyone clear photos.
Worth checking I guess, but I've never seen a blown ammeter fuse do anything but give 0 as a reading subsequently.
a7
hammy
May 3, 2022, 5:44pm
12
Measure the resistors with the multimeter to check the resistance is what you think .
Also you wires are just poked into the Arduino holes , which will give a poor result .
Yes i checked. They re consistent with colors.
Why in these experiments is there an Arduino?
Set up a proper experiment with resistors, wires, power supply (or battery) alone.
Use your ohmmeter, perhaps after some time with the manual or google if you aren't entirely confident about its use.
You will either confirm Ohm's Law or ...
determine that your meter is busted or bogus or …
duscover some exciting new science around voltage, current and resistance.
Third one there being the least likely.
a7
When i tried to measure current in my Arduino project i aware this weird result. İn order To be more clear i just show you weird part. But u re right . İf i used a battery it would be more clear. Of course ohm law correct and my multimeter wrong. I want to learn what is the possible problem or is this common with these cheap multimeters
It is possible that the contacts on the large multi switch selector are not making correct contact, hence the fact it looks like it is 100 times off.
U re right, i will clean connectors and try again
system
November 1, 2022, 3:19pm
18
This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.
