Odin DNA250C consistently reads atomizer resistance higher than Pico

[profess0r2000]

Hi all, I'm troubleshooting a Dovpo Odin DNA250C that appears to be reading resistance higher than another mod.

Using the same completely cold atomizer, without firing:

• Odin DNA250C Atomizer Analyzer: 0.469Ω (Raw 0.473Ω)
• Eleaf Pico/ArcticFox: 0.450Ω (Live 0.451Ω)
• Odin factory Mod Resistance: 0.004Ω

I also tested a second atomizer and saw the same pattern, with the Odin reading noticeably higher.

So far I've cleaned the 510/contacts, checked for resistance changes while gently moving the atomizer (stable), reapplied the DNA250C service pack, and performed an online Restore Defaults from Evolv, which restored the original Odin manufacturer configuration/theme. The resistance reading remained essentially unchanged.

This matters because I'm using temperature control and the Odin reaches its calculated temperature while the actual heater runs substantially cooler than it does on the Pico.

Before changing the factory 0.004Ω Mod Resistance or opening the Odin, is there a recommended DNA250C procedure for determining whether this is a 510/internal resistance issue, board measurement issue, or calibration issue?

Thanks!

[Wayneo]

No idea if Dovpo made any changes from the evolv defaults, but you can run those yourself. As well as setting/checking the internal mod resistance. Who even knows if your Pico is accurate.

Atomizer analyzer also showed you a temperature. Your mod uses that temperature to figure out internally what cold reading is at 70ºF for TC. You can see that in your TC profile right after the coil Ω's.

[profess0r2000]

3 hours ago, Wayneo said:

No idea if Dovpo made any changes from the evolv defaults, but you can run those yourself. As well as setting/checking the internal mod resistance. Who even knows if your Pico is accurate.

Atomizer analyzer also showed you a temperature. Your mod uses that temperature to figure out internally what cold reading is at 70ºF for TC. You can see that in your TC profile right after the coil Ω's.

Thanks, that helps. I hadn't accounted for the DNA normalizing the cold resistance to 70°F. I'll check the cold-ohms value in the TC profile after attaching the XL heater cold. The bigger issue I'm trying to understand is that Device Monitor reaches the TC setpoint and throttles power while a direct-contact thermometer on the SiC surface is still substantially below the expected temperature.

[profess0r2000]

4 hours ago, Wayneo said:

No idea if Dovpo made any changes from the evolv defaults, but you can run those yourself. As well as setting/checking the internal mod resistance. Who even knows if your Pico is accurate.

Atomizer analyzer also showed you a temperature. Your mod uses that temperature to figure out internally what cold reading is at 70ºF for TC. You can see that in your TC profile right after the coil Ω's.

Thanks — I did some more controlled testing based on your comments.

I restored the Odin to the online Dovpo manufacturer defaults and left the factory Mod Resistance at 0.004Ω. I then created a fresh temperature-sensing material using a linear TCR of 0.0002 (TCR200), with no preheat or Session Mode.

With the V5 XL completely cold, Atomizer Analyzer is stable at 0.473Ω (Raw 0.477Ω) around 84°F. Moving/twisting the atomizer does not change the reading.

I then measured the cold resistance for the TC profile and recorded a short 25W / 250°F run in Device Monitor. The CSV shows Cold Ohms at 0.466Ω and Live Ohms rising approximately:

0.469 → 0.472 → 0.473 → 0.474 → 0.475Ω

As it approaches ~0.475Ω, the DNA calculates approximately 250°F and throttles the power substantially. However, a direct-contact Terpometer on the SiC insert only reaches roughly 125–130°F.

I also noticed occasional anomalous samples in the EScribe recording, including a calculated temperature spike around 756°F / an 800°F Temp Peak, despite the 250°F setpoint.

For comparison, I put the exact same atomizer on an Eleaf Pico running ArcticFox. I verified the Pico profile is also set to Temperature Control, TCR200. The Pico reads the atomizer around 0.45Ω cold and heats the SiC substantially more at the same nominal temperature setting.

So at this point I'm hesitant to change the Odin's Mod Resistance or compensate by increasing the temperature/TCR. Does the DNA resistance/temperature behavior above look normal to you? In particular, would the transient ~756–800°F calculated samples suggest an electrical/contact issue, or is that something Device Monitor can report during normal transitions?

I have the EScribe and ArcticFox CSV recordings available if they would help.

[profess0r2000]

Update — I did some controlled testing with a Terpometer and EScribe Device Monitor.

DTV5 XL with SiC insert on a DNA250C. Factory mod resistance is 0.004Ω and cold resistance is consistently around 0.466–0.469Ω.

With a linear TCR200 material at 25W/250°F, the DNA sees Live Ohms around 0.474–0.475Ω as ~250°F and starts throttling heavily. However, direct Terpometer measurements showed the exterior ceramic only around 113°F.

I then switched to plain Watts mode (Boost off) so TC couldn't interfere. At 20W I measured approximately:

• Cold: 86°F / ~0.467Ω
• 5 sec: 120°F / ~0.485Ω
• 10 sec: 156°F / ~0.499Ω

The resistance rise in Watts mode is smooth and repeatable, and the SiC and exterior ceramic measurements are quite close.

Does this suggest that a linear TCR200 curve is inappropriate for this particular V5 XL heater on the DNA250C?

If so, does anyone have the current recommended DNA material CSV/curve for the V5 XL, or experience creating an individual material curve from measured temperature vs Live Ohms?

I'm especially interested in whether the old V5 TSM workaround/custom point near ~200°F is still recommended for the XL, or whether individual heater calibration is now preferred.

I haven't changed the DNA's factory 0.004Ω Mod Resistance.