EEVblog Electronics Community Forum
General => General Technical Chat => Topic started by: Boris_yo on September 18, 2022, 04:12:06 am
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Hi. Tested new alkaline battery 1.5v and here are the readings I got:
1. Chinese battery tester: 1.27v
2. Aneng brand Chinese battery tester: 1.50v
3. Chinese multimeter: 1.53v
Used lithium AA single-use battery:
1. Chinese battery tester: 1.23v
2. Aneng brand Chinese battery tester: 1.48v
Tested Sanyo 2500mAh barely charged AA battery:
1. Chinese battery tester: 1.03v
2. Aneng brand Chinese battery tester: 1.11v
Tested 9v alkaline rectangular battery:
1. Chinese battery tester: 8.85v
2. Aneng brand Chinese battery tester: 9.12v
It seems that while multimeter puts on zero load, the battery testers put a tad bit. Though why readings between both battery testers vary?
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Are these 'testers' analog meter variety? The cheaper the meter component the more inaccurate they are.
A analog meter is supposed to considered *most accurate at FSD (full scale deflection). Connect them to a good variable power supply and set the output to what the maximum range the meter should read. If that is anywhere near accurate, then check the meter at 1/4, 1/2, 3/4 range to see how good it is.
edit: most
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Yes, battery testers load the battery, a multimeter/DMM does not.
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Yes, battery testers load the battery, a multimeter/DMM does not.
I see now the question asked. Disregard my answer. Sorry.
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Hi. Tested new alkaline battery 1.5v and here are the readings I got:
::snip::
It seems that while multimeter puts on zero load, the battery testers put a tad bit. Though why readings between both battery testers vary?
Yes, a multimeter places essentially no load, while a tester places a load. As for the differences — well, think about it for a moment: what would cause a difference in measured voltage? Give us your hypothesis and we’ll let you know if it’s right.
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I think your generic or unnamed "Chinese battery tester" is the one getting the job done here...
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Which one is your Aneng tester? Does it look like this:
[attach=1]
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Connect a power supply set for 1.5V with rather hefty current capacity (at least 2A) and see what the #1 tester reads and how much current does it draw from the power supply.
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Some DMM's have a dedicated range for 1.5 and 9 volt batteries, which place a load across the cell. This gives a more realistic idea of the cell capacity.
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As for the differences — well, think about it for a moment: what would cause a difference in measured voltage? Give us your hypothesis and we’ll let you know if it’s right.
Impaired conductivity of battery tester? I used electronics contact spray on the one giving lowest reading and it still does. Probably has some kind of internal resistance or crappy components.
Which one is your Aneng tester? Does it look like this:
That's the one. Also here's the multimeter face. For voltage reading I set on 2 under V-
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Impaired conductivity of battery tester?
No. A battery is not a perfect voltage or current source, it has real world characteristics. Consider what those characteristics are.
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I suggest you probe the battery with the meter whilst it's being tested by the battery tester.
Theoretically you'll see more similar readings between the meter and tester as the meter will be reading the loaded battery
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Measure the battery current during the battery test to check for differences between testers.
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As for the differences — well, think about it for a moment: what would cause a difference in measured voltage? Give us your hypothesis and we’ll let you know if it’s right.
Impaired conductivity of battery tester? I used electronics contact spray on the one giving lowest reading and it still does.
No, it’s not that.
Probably has some kind of internal resistance or crappy components.
Earlier, you mentioned the battery tester applying a load. That is correct. Now, what poses a higher load (= more current flow): a smaller resistance or a larger one?
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Probably has some kind of internal resistance or crappy components.
Earlier, you mentioned the battery tester applying a load. That is correct. Now, what poses a higher load (= more current flow): a smaller resistance or a larger one?
Are you talking about resistance of battery or impedance of battery tester?
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It’s a general question to see if you understand Ohm’s law.