Ohms and Volts - and some surprises

[hifistud]

This all surprised me!!

Sublime Vapours 11/25/10 09:38AM, Sublime Vapours 11/25/10 09:38AM Hifistud on USTREAM. Educational

And on Youtube:

 

[emonty]

very informative Dave!!!

 

[Switched]

Very interesting indeed. I have done many such experiments and I would like you to pursue those tests with different attys. I don't have a cisco atty but I do get about a 0.5V+ drop on everything unregulated, but only a 0.2V drop on a particular regulated board. Notwithstanding, I do have a regulated device that drops 0.5, regardless of atomiser.

However, all that being said, the eGo will put out 3.2V until it is dead. So folks should not fear vaping at a lower voltage as you pointed out in your vid. Thank you Dave and please continue your experiment and come back to us with your conclusions.

 

[hifistud]

I'll be making sure that everything I review or play with gets properly checked and tested - this widget is likely to prove to be an amazingly useful tool...

 

[emonty]

were can we get this widget or can anybody point out how to make it, thank you!

 

[hifistud]

Daves Devices is the place - use the contact form to get hold of Dave and he'll sort you out.

 

[emonty]

Daves Devices is the place - use the contact form to get hold of Dave and he'll sort you out.

thank you, appreciated!

 

[hifistud]

Welcome!! ...

 

[emonty]

strange, I go to contact and cannot enter anything......

 

[hifistud]

OK - if you go to the "preferred suppliers" page, there's a link under the banners... his nick is Dave. I can't put a link in here, due to rules...

 

[emonty]

OK - if you go to the "preferred suppliers" page, there's a link under the banners... his nick is Dave. I can't put a link in here, due to rules...

the uk vapors forum, right?

 

[hifistud]

Aye... indeed.

 

[Scottbee]

Interesting video...

Some similar information was posted back in January: http://www.e-cigarette-forum.com/forum/joye-510/65055-battery-voltages-surprise.html

What was discovered when using the oscilloscope is that the voltage output of the 510 style battery system (including the eGo class units) is not actually "true DC". It is pulsed. Trying to measure that effective voltage with an inexpensive meter that can't evaluate "true RMS" will give unrealistic results.

 

[Switched]

Hey Scott LTNS, care to expand on your observation wrt the vid as per my question? I am aware of PWM, I am curious as to why all unregulated devices ----> 3.3V loaded?

 

[Scottbee]

Hey Scott LTNS, care to expand on your observation wrt the vid as per my question? I am aware of PWM, I am curious as to why all unregulated devices ----> 3.3V loaded?

It would be pure speculation on my point.. and I do not want to insult or question another testers setup or results without additional data. Obviously I got results that were different (my Bartleby for example will deliver 3.6VDC into a Cisco 1.5 510 atty) and more consistent with expectations.

The internal resistance of the battery, device, and of course the test rig all come into play here. It would only take about .1 Ohm of parasitic resistance in the test rig or device to completely muck up the results.

Also, one would expect "large" batteries to have low internal resistance and they should be able to deliver very close to 3.7VDC into even low resistance loads. But... just because a battery is "large", that is no absolute guarantee that it has low internal resistance.

 

[emonty]

ordered one from Dave, thxs for the great tip!!!

 

[hifistud]

It would be pure speculation on my point.. and I do not want to insult or question another testers setup or results without additional data. Obviously I got results that were different (my Bartleby for example will deliver 3.6VDC into a Cisco 1.5 510 atty) and more consistent with expectations.

Indeed - and I thank you for your courtesy! That was very much an "unboxing" and a bit of experimentation. The next job is to get the scope out and do a little more digging - there are many, many batteries to check out!

The internal resistance of the battery, device, and of course the test rig all come into play here. It would only take about .1 Ohm of parasitic resistance in the test rig or device to completely muck up the results.

Also, one would expect "large" batteries to have low internal resistance and they should be able to deliver very close to 3.7VDC into even low resistance loads. But... just because a battery is "large", that is no absolute guarantee that it has low internal resistance.

Also very true. Dave's device is, I think, primarily a tool to allow any user to get a broad view of what's going on vis a vis batteries and atties/cartos - but I've got much more work to do before anything completely definitive is likely to emerge.

Fun, though!

 

[Papa Lazarou]

Good video, cheers for posting Something I wondered is whether the the atomiser resistance changes much with temperature, especially while its being used. Is that something you can measure with that?

Also would be interesting to note if you got the same voltage drop on the mods when using something like an AW IMR high drain battery.

 

[hifistud]

It's possible to measure the current draw and the voltage under load, so the resistance can be calculated from that - with a non-regulated battery, at any rate. With PWM batteries, then the scope will have to come out, I think. That said, I do want to tie down some useful measurements that everybody can do with a simple multimeter and Dave's sniffer device.

And yes, that's one of the questions that interests me, too. One would hope that an IMR would cope better with an LR atty or carto. More experimentation to be done!! I think Dave may need to get a lot of these sniffers into production!

 

[basilray]

Dave!

Let me start by saying that I have always enjoyed your work, but find the "sober" videos much more enjoyable than the "inebriated" vids, if you will.

This is a very informative video. Testing under load is important to some, but I think not all because of the degree of difficulty without some sort of specialized piece of equipment to do so. Assuming that the fancy rig you have starts hitting the market, I think "under load" will be the new catch phrase in the vaping community!

I look forward to more vids of your testing! Thanks for posting this!!!