Reasonably well- as long as you're not expecting to catch 1ns spikes....
Most of the write ups are positive, software is open source-
I think that's what scottbee used to capture the traces earlier...
Battery Voltages -- Surprise!
- Thread starter Scottbee
- Start date
- th_trl_thread_readers 0
- Status
Reasonably well- as long as you're not expecting to catch 1ns spikes....
Most of the write ups are positive, software is open source-
I think that's what scottbee used to capture the traces earlier...
this would capture the trace - digitally at a sample rate of up to 150K samples per second -you need to sample 2x the shortest signal you're trying to capture...... making it equivalent to a 60K scope.
- you plug it into your computer via USB and your computer displays it.. ...
Plus once you have it on your computer, you can do whatever you want with the data...
How would voltage drop for diode be determined? You use duty of 0.81 as example and use for possible correction factor. Did you note that duty on the scope screen of loaded eGo seemed to show approximately 64%. At 64, takes that correction to 1.25 and squaring even worse of course. Do you agree it is showing something like 64%? Note my unloaded, unreliable testing at mostly in high eighties and it seems most posts that I have read put duty in mid eighties(+ or - some).
Just thinking about that scope image. 3.92 peak and apparent duty of ~64%. Makes Vave about 2.51. Makes Vrms 3.14. Let's assume a "standard" atty at, say, 2.8 ohms. Watts becomes 3.14*3.14/2.8 or 3.52. Seems awfully low. What's wrong here?
That would probably be cheaper than trying to find the interface option for my scope.
Maybe I'll give ebay another shot. Taking pictures of a DSO seems sort of 'old school'.
I had to run the cal program twice but it looks OK now. Maybe in the next few days I'll get a chance to play some more with the eGos.
Notice that digital measuring devices have a built in '1 bit' noise. If not filtered out will add to peak measurements, 1 bit on the zero and 1 bit on the peak for a peak to peak 2 bits higher than the true peak.
Last edited:
yep- on all counts.... they aren't perfect but you can get consistent measurements, a picture and data dumped right into your computer to do whatever you want with....
I was looking to pick up a digital storage scope on flea bay and these kept comming up- oddly, you can get a great scope for $200 but I don't want it around the house- already have too much junk....
Went ahead and took the first measurement on eGo (#2).
pic#1 is at full charge, 3 ohm carto. I'll add a couple more pics as I vape this one down.
pic#2: about 25 min
pic#3: about 55 min
pic#4: about 90 min
pic#5: about 120 min
pic#1 is at full charge, 3 ohm carto. I'll add a couple more pics as I vape this one down.
pic#2: about 25 min
pic#3: about 55 min
pic#4: about 90 min
pic#5: about 120 min
Last edited:
pic#6: about 150 min
pic#7: about 180 min
pic#8: about 200min (note Duty Cycle jitter)
100% a few puffs later, and then not enough for vapor a few minutes after that.
All done
The test Setup:
Tek TDS 310, 1Xprobe, Cheapo meter modified for loaded voltage testing.
900mah eGo and 3 ohm CE2,
pic#7: about 180 min
pic#8: about 200min (note Duty Cycle jitter)
100% a few puffs later, and then not enough for vapor a few minutes after that.
All done
The test Setup:
Tek TDS 310, 1Xprobe, Cheapo meter modified for loaded voltage testing.
900mah eGo and 3 ohm CE2,
Last edited:
nice pics, so looks like the ego is regulating to 3.3Vave to me, the Vrms formula (/root(dc) agrees with the CRO pretty well.
Vrms is dropping as the battery lowers which explains the drop off in performance I have noticed from a full charge to a flat battery, even though throwing a multimeter at it says the same voltage over all.
problem solvered.
Vrms is dropping as the battery lowers which explains the drop off in performance I have noticed from a full charge to a flat battery, even though throwing a multimeter at it says the same voltage over all.
problem solvered.
I think we are getting close to 'crash and burn'.
I/m trying to catch the 100% point.
Less than an hour, I'm sure
Vavg is climbing and Vrms is falling.
Edit: Test complete, see results a couple of posts back.
Night ya'll.
I/m trying to catch the 100% point.
Less than an hour, I'm sure
Vavg is climbing and Vrms is falling.
Edit: Test complete, see results a couple of posts back.
Night ya'll.
Last edited:
I think we are getting close to 'crash and burn'.
I/m trying to catch the 100% point.
Less than an hour, I'm sure
Vavg is climbing and Vrms is falling.
Edit: Test complete, see results a couple of posts back.
Night ya'll.
Great pictures. Seems as if regulation is to neither RMS or average. Right on theme - SURPRISE! But closer to RMS than average. 3.223 to 3.4 (change of +0.177) on average volts and 3.538 to 3.417 (change of -0.121) on RMS volts. A 0.15 add to cheapo DC volts not too bad of an estimate of RMS volts. Using RMS squared divided by 3 ohms I get power at 4.17 to 3.89 watts. (4 + or - 0.15, there about). Makes some of the high voltage reports of 12 to 16 watts seem even hotter. Some cheapo meters have AC reads that are not based on half cycle averages. Thinking that with such meters some relationship to the AC read of such meters might provide a better correction factor to the DC read to get to RMS volts than simply a 0.15 add.
Last edited:
Well, what it shows me, with playing with the scope, the meter, the camera, and posting pictures, a 900mah eGo lasts me a little over 3 hours. Can you imagine a 16 hour day?
Guess that's why I use Big Battery Mods, and let the wife use the 'girly' e-cigs
\
Newton was wrong. A bigger battery falls slower, much slower.
Guess that's why I use Big Battery Mods, and let the wife use the 'girly' e-cigs
\
Newton was wrong. A bigger battery falls slower, much slower.
Last edited:
Well, what it shows me, with playing with the scope, the meter, the camera, and posting pictures, a 900mah eGo lasts me a little over 3 hours. Can you imagine a 16 hour day?
Guess that's why I use Big Battery Mods, and let the wife use the 'girly' e-cigs
\
Newton was wrong. A bigger battery falls slower, much slower.
Could you make an a reasonable estimate of how many hits you where taking each minute and duration of the hit? Thinking that mAh might be estimated here. Peak volts off charger was 3.96 and 3.44 peak near cut off. Average is (guess what) 3.7 volts. At 3 ohms - about 1.233 amps. Say 6 second hits - each hit about 2.06 mAh with no PWM - 2.06 times average duty with PWM - ~2.06*0.912 or 1.88mAh. Say average 2.5 hits per minute - estimating - 4.7 mAh per minute. 200 minutes (500 hits) - 940 mAh. Maybe number of hits over-estimated?
Naw, by my estimate: I vape a lot
For a whole day I used to go through at least a dozen 510 batts (had a 5 port charger at work, and one at home),
An 18650 didn't make it all day, two would,
a 26650 makes it ALL DAY, usually.
The eGos are for the wife, after she outgrew the 901.
The big mods just aren't her 'style'.
Compared to other e-cigs, the 900mah seems reasonable for the eGo.
Last edited:
Naw, by my estimate: I vape a lot
For a whole day I used to go through at least a dozen 510 batts (had a 5 port charger at work, and one at home),
An 18650 didn't make it all day, two would,
a 26650 makes it ALL DAY, usually.
The eGos are for the wife, after she outgrew the 901.
The big mods just aren't her 'style'.
Compared to other e-cigs, the 900mah seems reasonable for the eGo.
Your choice. But great pics and great experiment. So - what do you think is parameter being regulated to? Maybe, little guy on board drawing straws of shall, I pick RMS or shall I pick average.
Not knowing what the Joye engineers did but I do know that if you know how a circuit responds, like cell discharge curves, that it would not be difficult to use a scaled voltage to drive a PWM circuit. Sense the only voltage available (loaded cell voltage at the time of fire) and drive the output mosfet with a Duty Cycle derived from that sensed voltage. A sample and hold circuit in the controller, op amp, PWM output. THe PWM output could be feed back to a comparator until a pre determined voltage is output. We can see this kind of varying pulse width at start up, just before the output stabilizes. All of the circuits could easily be inside the small controller chip in the eGo. The six pin chip in the Li-ion protection board has several voltage references, comparators, an oscillator, logic gates, and drivers for the mosfets. This type of integration would be easy for something that was going to be 'mass produced'.
The slope of the Duty Cycle correction could even have multiple steps, or zones for various loaded cell voltages. If the goal was to 'flatten' the drain curve, they were successful. If would be difficult to keep the output level until the cell was discharged with a pre-programmed compensation that would work with a wide range of atty resistances, and still work as the cell aged.
So in short:
I think a voltage sample is taken each time the eGo is fired with this voltage setting the pulse width/duty cycle.
The amount of compensation was designed in just to flatten the power delivered. Only partial compensation was the objective. Better than none.
The slope of the Duty Cycle correction could even have multiple steps, or zones for various loaded cell voltages. If the goal was to 'flatten' the drain curve, they were successful. If would be difficult to keep the output level until the cell was discharged with a pre-programmed compensation that would work with a wide range of atty resistances, and still work as the cell aged.
So in short:
I think a voltage sample is taken each time the eGo is fired with this voltage setting the pulse width/duty cycle.
The amount of compensation was designed in just to flatten the power delivered. Only partial compensation was the objective. Better than none.
Last edited:
I kind of liked the little guy drawing straws. Much simpler to comprehend (for me). eGo has a bit of magic to it but there are many who prefer no little guys on their board. Riva for example. I kind of like it better than eGo - particularly at the front end. It seems to me we (vapers) might be doing our own regulation. That is, get a stronger early hit from a Riva -maybe 4 seconds is great. Get a toned down hit from an eGo - maybe need 5 or 5.5 seconds to "feel good". Auto regulation has apparent advantages but - possibly - organic appeals as well.
Sort of like
"pay no attention to the man behind the curtain"?
or,
some of us have multiple Big Battery mods all charged up ready to go
The first few hours off a 26650 UN-regulated battery is fairly flat.
But, the eGo has a following. It works for many.
"pay no attention to the man behind the curtain"?
or,
some of us have multiple Big Battery mods all charged up ready to go
The first few hours off a 26650 UN-regulated battery is fairly flat.
But, the eGo has a following. It works for many.
Last edited:
Some charting with Rocketman experiment results:
[/URL] Uploaded with ImageShack.us[/IMG]
A Riva or some other unregulated batt would produce heat (watts) on the order of the yellow line. The regulated eGo is the turquoise line. More consistent - but lower.
A Riva or some other unregulated batt would produce heat (watts) on the order of the yellow line. The regulated eGo is the turquoise line. More consistent - but lower.
JW,
That is a cool set of graphs. Thanks for taking the time to chart the data points I got (hope they are close to what others have gotten). If I get motivated in the next few days and test an eGo with a 1.6 ohm carto would you be willing to duplicate the graph for those results?
3 ohms is probably the highest that can be used with the eGo (and produce any vapor) and 1.6 ohms is probably the lowest resistance that can be used without damaging the eGo.
(you even name the image "rocketman")
That is a cool set of graphs. Thanks for taking the time to chart the data points I got (hope they are close to what others have gotten). If I get motivated in the next few days and test an eGo with a 1.6 ohm carto would you be willing to duplicate the graph for those results?
3 ohms is probably the highest that can be used with the eGo (and produce any vapor) and 1.6 ohms is probably the lowest resistance that can be used without damaging the eGo.
(you even name the image "rocketman"
)JW,
That is a cool set of graphs. Thanks for taking the time to chart the data points I got (hope they are close to what others have gotten). If I get motivated in the next few days and test an eGo with a 1.6 ohm carto would you be willing to duplicate the graph for those results?
3 ohms is probably the highest that can be used with the eGo (and produce any vapor) and 1.6 ohms is probably the lowest resistance that can be used without damaging the eGo.
(you even name the image "rocketman"
Absolutely on the charting. Much easier on second goround. An experiment with the 1.6 ohm atty may provide some explanation of the ~64% duty of the eGo in the eGo Booster video.
- Status
Similar threads
