Usb pt v?

[henrid84]

what is the voltage voltage of the PT? i know iead it somewhere i believe it was 3.7? if so i picked up a wall/usb adapter from radio shack (where i work) and its 5 volts and this thing is AMAZING.

just curious though, am i killing my PT faster by using this?

 

[Adrenalynn]

The PT is 5v, it's a USB passthrough - it's passing-through the voltage from the USB port, which is a regulated 5v. In order to bear the moniker "USB" it _must_ be 5v input - internally it can do whatever it wants with that 5v, but it must take the 5v supply.

The 5v PT will consume juice faster than a 3.7v [nominal] battery however... And likely burn up an atomizer faster, so need to be even more careful not to run them dry if you refill.

 

[DaShiVa]

The PT is 5v, it's a USB passthrough - it's passing-through the voltage from the USB port, which is a regulated 5v. In order to bear the moniker "USB" it _must_ be 5v input - internally it can do whatever it wants with that 5v, but it must take the 5v supply.

The 5v PT will consume juice faster than a 3.7v [nominal] battery however... And likely burn up an atomizer faster, so need to be even more careful not to run them dry if you refill.

You strike me as the type to own a multimeter... I remember someone testing output on the batts, but noone actually tested the operating voltage of a PT. Not sure how much resistance is in it, and how much it varies from a pc to a wall plug to a cigarette lighter adaptor.

 

[henrid84]

You strike me as the type to own a multimeter... I remember someone testing output on the batts, but noone actually tested the operating voltage of a PT. Not sure how much resistance is in it, and how much it varies from a pc to a wall plug to a cigarette lighter adaptor.

ya, because swear this thing works so much better than n the comp (2.0) witch is supposed to be 5 volts?

 

[Adrenalynn]

Well, both the computer and adapter will be 5v output. The adapter may be able to deliver more current, however.

Dash' - yeah, "one or two"... I'd need to disassemble the PT, I can probably do that tonight or tomorrow.

Just as an aside, since you "asked" - my home lab meters that get the most use (not the handhelds) are one of these: Agilent | 34410A Digital Multimeter, 6½ Digit High Performance and one of these: Bench Multimeter, NIST With Data - Bench Type Digital Multimeter - Electronic-Bench Testing - Test Instruments : Grainger Industrial Supply

 

[DaShiVa]

Adrenalynn, I stumbled across this thread for testing purposes: http://www.e-cigarette-forum.com/fo...-device-under-load-prodigy-other-devices.html - don't know if it's of any help to you, but might save taking a device apart.

 

[Adrenalynn]

Thanks for that - but it would require mating connectors that I don't have, or gutting both a battery and a cartomizer to get 'em.

I figure I'll measure the voltage at the terminals for the atomizer at rest, measure the voltage at the terminals for the atomizer under draw, plotted over time (until cut-off), then measure current draw.

Actually, I could probably just make-up a dummy USB extension, I have those connectors, but that adds some resistance. Every time you add a connector in the way you're adding a fair bit of resistance to the circuit. Most accurate would be gutting it and testing it at the output.

 

[DaShiVa]

Gutting a cartomizer to get the contacts makes sense, if that's what you meant, i thought you were talking about gutting an actual PT though, and I didn't see how that would help. - but I've got a lot of stuff on my plate at work today, so not tracking so well, don't mind me

 

[Adrenalynn]

Actually, no. Not if you want voltage under load. The cartomizer needs to be intact so you can draw on the PT. Without drawing on the PT, you're just going to be measuring voltage through a small resistance of the wire.

Gutting both a carto and a battery would give the male/female connectors necessary to build a semi-passive adapter (minus the resistance at the coupling).

Taking apart the PT will allow the voltage to be measured at the cartomizer, as well as the current draw.

 

[Pawpaw]

This is a crappy pic of the dead manual PT I tore apart a couple of months ago.

All I can see is the switch, a small resistor, & what I assume is an FET.