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19852 Posts in 1275 Topics by 5182 Members - Latest Member: charbuild March 29, 2024, 03:46:39 AM
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Breaktru Forum  |  eCigarette Forum  |  Modding  |  Topic: The Multi-Meter is my Friend
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Author Topic: The Multi-Meter is my Friend  (Read 10167 times)

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Online Breaktru

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The Multi-Meter is my Friend
« on: September 30, 2011, 10:19:08 AM »
Assuming you have a decent Multi-Meter and you know how to properly read it,
measure your atty/carto resistance, attach atty/carto and measure voltage and current draw.

DON'T rely on Ohm's Law. You're calculations will be way off compared to what you are actually getting.

Current and Wattage is subjected to your regulator and battery limitations.

I've made these comparisons between actual measurements and ohm's law with the 08100w w/ two batts in series and w/ different batt models and mah's.
Also w/ the 04050c w/ 1 batt and w/ two batts in parallel and w/ different batt models and mah's.
« Last Edit: September 30, 2011, 10:26:29 AM by Breaktru Admin »

Online Breaktru

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Re: The Multi-Meter is my Friend
« Reply #1 on: September 30, 2011, 11:10:39 AM »
Handy Multi-Meter accessories:

Attach atty/carto to top, screw bottom into PV, attach amp probes to protruding studs, place meter on amperage 10A taking note of polarity. Neg to bottom, Pos to top stud. Meter will shunt to complete circuit.




Place atty/carto on top and screw bottom into PV.

Offline steamEngine

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Re: The Multi-Meter is my Friend
« Reply #2 on: September 30, 2011, 02:25:26 PM »
YES!
I thought that all along. I just ran some tests as you described and found that you are absolutely correct.
I see so many modders relying and quoting ohms law  :rules: as gospel. Now we know better  :applaude:

Offline SmokeRings

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Re: The Multi-Meter is my Friend
« Reply #3 on: September 30, 2011, 03:47:53 PM »
I tried to measure amperage but not sure what I'm doing  :-\

Online FlameOut

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Re: The Multi-Meter is my Friend
« Reply #4 on: September 30, 2011, 04:04:32 PM »
I tried to measure amperage but not sure what I'm doing  :-\

I would also like some insight in to hooking up the amp meter
and how is that blue thingy put together :help:

Online Breaktru

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Re: The Multi-Meter is my Friend
« Reply #5 on: September 30, 2011, 04:25:16 PM »
Okay, on the adapter to measure amperage,
Bottom connector is an old atty base and top one is a battery connector.
The center posts are wire together with a solid wire.
The outside casings (grounds) are NOT connected. (meter shunt completes circuit)
I soldered a small finishing nail end to each of the outer cases.
The amp meter leads will be place on each nail, Black to bottom and Red to top.

Setting the Meter:
Place your meter on Amps, DC, 10A range.
Usually the meter has 3 or 4 inputs for your meter leads.
The Black lead stays in "COM"
The Red lead goes in to "10A" not "mA"

Online Breaktru

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Re: The Multi-Meter is my Friend
« Reply #6 on: September 30, 2011, 07:32:16 PM »
I would like to play a little game here..........

With Ohm's Law, calculate what you believe your Amperage and Wattage is
then take actual measurements and post both results here...

Measure your atty or carto for actual resistance and your voltage output w/ the atty/carto attached.
Use the Amperage = Voltage x Resistance
the Wattage = Voltage x Amperage
Then compare to actual measured Amperage and find Watts as described above.

Offline memnoch

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Re: The Multi-Meter is my Friend
« Reply #7 on: October 03, 2011, 02:45:10 PM »
I'm pretty sure Ohms Law will still be correct, the difference is, your values are probably wrong that you're using. Chances are you're using estimations and as such, your result is incorrect. If all values are measured and then the math applied, the math should work. Remember, it's not Ohm's suggestion, it's Ohm's Law...

(not to sound like an ass with that last line there, but 1 +1 always equals 2, know what I mean?)

regards
« Last Edit: October 03, 2011, 02:54:11 PM by memnoch »

Online Breaktru

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Re: The Multi-Meter is my Friend
« Reply #8 on: October 03, 2011, 02:52:54 PM »
I'm pretty sure Ohms Law will still be correct, the difference is, your values are probably wrong that you're using. Chances are you're using estimations and as such, your result is incorrect. If all values are measured and then the math applied, the math should work. Remember, it's not Ohm's suggestion, it's Ohm's Law...

(not to sound like a --- with that last line there, but 1 +1 always equals 2, know what I mean?)

regards

I'm not saying that ohm's law is wrong.
I am pointing out the limitations of the regulator/DC-DC converter, battery and the internal wiring/connections.

Offline memnoch

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Re: The Multi-Meter is my Friend
« Reply #9 on: October 03, 2011, 02:53:51 PM »
I'm not saying that ohm's law is wrong.
I am pointing out the limitations of the regulator/DC-DC converter, battery and the internal wiring/connections.

That makes much more sense (=

Online Breaktru

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Re: The Multi-Meter is my Friend
« Reply #10 on: October 03, 2011, 04:12:17 PM »
Mem, I've taken voltage readings under load and actual resistance readings of my atty/carto and calculated w/ ohms law.
But if I compare it to the actual amperage (using regulators) I would see a big difference. I would expect that from the booster reg but I also seen it with the step down reg.

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