Fnirsi HRM-10 internal resistance meter - test and teardown

Testing the HRM-10 internal resistance tester (meter) from Fnirsi. It's intended to measure the internal resistance and the voltage of batteries, but it also seems to be able to measure the ESR of electrolytic capacitors and supercapacitors, and even resistances (resistors) down to sub milliohm values. This is possible thanks to its 4-wire Kelvin probes.

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[adrian.parano]

This is the best review for HRM-10 device I have seen in YT. You always go far and beyond, and this is simply because of your ex excellent understanding of how things work. Congratulations!!!

[d.k.]

Danke!
Thanks!

The comparison of all this types on one gadget gave me a good reference.
Very helpful.

[noakeswalker]

I built a 50KHz Esr meter, and a constant current adaptor for my Fluke multimeter for simple 4-wire milliohm measurements. But here is a device that will do both with 100x better resolution, AND it will do battery internal R as well ! I like your thinking about the phase measurements this could be doing, DGW. Thanks for showing us this thingy, it's a _good_ thingy.

[juanferrer]

Also got mine a week ago, here in Cdmx Mexico. It was a pretty nice surprise see your analysis. Saludos

[lorenzorentniop]

Hey you could try meshuring the R-ds on of MOSFETs!

[OldSkoolF]

Your videos are very good. Merry Christmas!

[WagTsX]

another cool device from Fnirsi. I would buy it just for checking smaller battery quality, but I already have a lead-acid (12v) battery analyzer that does check internal resistance using the same 2-wire per probe method, and when I need to work with batteries nowadays it's because i'm working with an UPS that use 12v VRLA batteries.
I beg for a feature like this to be built in multimeters from Fnirsi, it'll definately be handy.

[LawpickingLocksmith]

Got mine a few weeks ago. After setting time and date I also tested capacitors. It is then a 3 in one instruments as it keeps a log of tested units. First time I think back to the year 1985 when I spent 2 months of wages on a Fluke 8024B just to measure true RMS. This one had the famous Siemens ranges for low resistance. The Fluke had the shortest lifespan of all multimeters I ever bought out of around 50. Thanks Fnirsi, finally some good value for money.

[piconano]

I like it. I have their radiation meter and it works great.
This meter is a lot nicer than my old one panel type that measures only resistance and only up to 2 Ohms.
I used mine to make custom high current shunts for my projects.
Thanks for the video. I'm ordering one from your AliSlow link.

[dieseltinus]

So with this one you can find a short circuit on a printed circuit board. Handy.

[Basement-Science]

I know this is kind-of an industry standard testing method, but: I'd like to see some comparisons to an actual DC load test. Measure the open circuit voltage and then the voltage with a 10 ohm load or so, and calculate the internal resistance that way after 2s for example. While the capacitance of the batteries may be insiginifcant at 1kHz, any chemical short-term effects may be very significant depending on the battery type.

[adrian.parano]

I wonder what would happen if you charge the capacitors with different voltages before you measure them.. would it have any impact to the measured resistance values?

[adrian.parano]

It would be very interesting to know why only film capacitor showed 0.00mohms 😯

[dino]

Thanks for great review. I was looking for a low-ohm meter, this looks good and have ordered one. I was unsure before and I think they missed out on some sales by focusing on the battery internal resistance testing. It would be even better with a separate capacitor testing mode, perhaps possible through a firmware update.

[dredm]

My compliments, Dany K 📟
This channel gets better everyday on YouTube
May God reward you for you reviews, product safety and last but not least: analysis 📲

[amersa]

Heyy Daniel, , could you please explain to us, how 555chip gives us negative voltages, i did not get it, we can by using 555chip make voltage multiplier or Generating a negative voltage using diodes and capacitors ... i did not understand this.

[MrSlehofer]

Have you also tried measuring internal resistances of power inductors or SMPS transformers?

[Azaakiel]

Very nice quality product it seems. Nicely done probes. How good are tantalum capacitors?? Test panasonic batteries and panasonic 18650 and 21700 :)

[Gengh]

That's pretty good, are those big HV electrolytic caps used for coupling the generator so that it can send the signal without much attenuation and can work in batteries?

[Z-Ack]

With your style of humor and attitude along with the lifestyle ive picked up on your youtube videos, you gotta be puffing on that ole green shisha at least every once in a while.