Wismec Reuleaux RX200S scope measurements

Wismec Reuleaux RX200S scope measurements

This is part 2 of my look at the Wismec Reuleaux RX200S. To read part 1, look here:


Test setup

Here is the 0.2Ω load consisting of five 1Ω power resistors. The wires are 18 AWG.

2016-08-14 14.40.30-testload

The wires could have been thicker, and the solder joints more solid, but the point here is to have a consistent resistance, not necessarily the lowest one possible.

In any case, I’m measuring the voltage at the atomizer deck, so the voltage drop in the wires is not going to affect these measurements.

And here is the entire test setup.

2016-08-14 15.19.22-testsetup

The RX200 is connected to the load. The oscilloscope is connected to the center pin, and grounded at one of the negative posts on the atomizer deck.


Oh look, there’s a heartbeat.


There is one pulse every 200ms. Each pulse is about 450mV.

A closer look at one of the pulses. They vary somewhat in duration and shape, but in general they look like this.


The duration of each pulse seems to be somewhere between 5 and 10 ms.

Ok, enough of that. Let’s get to the meat of the matter.

Firing the mod

The Wismec RX200S still reads the load as a resistance of 0.23Ω.

I will measure the mod at the following settings: 5W, 10W, 20W, 40W, 80W, 160W, 200W and 250W.


At 5W the mod displays a voltage of 1.07V. The scope agrees.


At 10W the mod displays a voltage of 1.52V. The scope agrees.


At 20W the mod displays a voltage of 2.14V. The scope agrees.


At 40W the mod displays a voltage of 3.03V. The scope displays 3.06V RMS. Close.


At 80W the mod displays a voltage of 4.29V. The scope says 4.42V RMS. Only 3% too high in voltage, but closer to 6% too high in power (85W).


At 160W the mod displays a voltage of 6.07V. The scope says 6.32V, which is 4% too high. Convert to power, and we get more than 8% too much, at 173.66W.


At 200W the mod displays a voltage of 6.78V. Oscilloscope RMS is 7.06V (still 4% too high). Power is 216.71W which is still at 8% too high.


At 250W the mod displays a voltage of 7.58V. The scope said 7.81V during the first test, and 7.95V during the second, when the batteries were slightly discharged.

At 7.95V the voltage is closer to 5% too high, and the power is 274.79W, which is almost 10% too high.

Ramp up time

Looking at the shape of the graph, it is obvious that the ramp up time gets longer with higher wattage settings.

From a quick glance at the screenshot, it may look awfully long at 250W. Still, it’s only 150 ms or so at its longest.

That is probably not something you would ever notice while vaping.

Zoom & Enhance

The signal does look a bit hairy. Here’s the knee, just as the mod reaches the full voltage at its 250W setting.


And here is a closer look at the flat part, at increasing zoom levels.

Wismec-zoom-enhance5  Wismec-zoom-enhance7  Wismec-zoom-enhance9  Wismec-zoom-enhance11

This digital “ripple” seems to have an amplitude of about 0.4V give or take, which is ~5% of the total voltage. The frequency looks like 150 kHz or so.

I doubt that anyone would be able to hear, feel or taste any of that.

The RMS voltage is on the high side

When firing at full blast, the mod says that it’s outputting 7.58V. At 0.23Ω that is 249.96W and 32.96A. Very close to the selected power setting.


The scope on the other hand, said that it was measuring 7.81V RMS. At 0.23Ω that is 265.2W and 33.96A on the first try.

On the second try, the scope measured 7.95V, which is 274.79W and 34.57A.

That is a little bit lower than the measurement from my multimeter (see part 1), but still quite a bit higher than what the mod claims on its display.


It looks like the Wismec Reuleaux RX200S is a decent quality mod. Some shortcuts have been taken, but nothing too atrocious.

The mod does not have battery balancing, which is inconvenient for those of us who prefer to charge via USB. However, provided that the mod monitors the individual cells, and stops charging/discharging when it detects that a cell has gone out of bounds, this is not a safety hazard.

It does seem to fire a bit hotter than it should, especially noticable at higher power settings. Some may see this as a boon, while fussy nitpickers like me may be slightly irked. At least it doesn’t fire cooler than it claims to.

I think I can set the max output current in the Mod Range calculator to 35A, at least for now.

Other than that, I’m not really sure what to say about this mod. What do you think? Did I do the measurements wrong? Is the discrepancy significant? Do you prefer a mod that fires hot, to a mod that is accurate? And just how accurate should we really expect our mods to be? Feel free to let me know what you think in the comments below.

5 responses to “Wismec Reuleaux RX200S scope measurements”

  1. Hi Lars,

    Thanks for taking the time to properly test the RX200S, there’s been a lot of rumors, bro science, speculation and proud ignorance thrown around about the updated version of the RX200.

    Nothing to say about your test method, it’s more than scientifically adequate to me XD.

    I’ve had mine for 10 days now, red on black like yours, but I bought a set of black panels for it, as my devise is: if it ain’t, “paint it black”, and I have to say I’m really quite happy with it.

    Otherwhise, about the mod’s chip measurement accuracy I’d say that for it’s price and specs we really can’t complain, there are mods more than twice the price that are less accurate.

    And don’t get me started on falsely advertised specs…

    Here we get a few extra unadvertised joules, what’s to complain about? ;o)

    My only gripe atm about the RX200S is that Wismec could have raised to the occasion and upgraded the 510 connector for something less shitty…

    I’ve made a few shims for the atties I use on it, no big deal, but I’d gladly have spent 5 more bucks if it came with a properly springed 510.

    Voilà for my 2 cents, thanks again for your contribution to the vape community knowledge and safety.



  2. Hi, my RX200S had a little accident and all that is left is the main board, i have decided to make a case of my own and put a lipo battery. Should i go for 2s or 3s battery? What discharge rate should have, 30c -35c is ok or i need a higher one? Either battery will be 1500 – 2000 mah max for space reasons.

    • Is the board easily reconfigurable to 2S? If not I would go with 3S if I were you. You should try to get a battery with at least a 35 A continuous discharge rating, preferably more. For a 2Ah battery that’s a C value of 17.5 or greater, for a 1500 mAh battery it’s a C value of 23.33 or greater. Remember to use a detachable battery, because you will need to balance charge the battery in an external charger from time to time.

  3. I dont think that it can be reconfigure the mainboard to run on 2s so i will order is a 3s 1500mah 40c discarge rate. I will charge the battery with an external charger-balancer and not from the usb of the device so i think it should work out.

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