Products > Test Equipment
FNIRSI HRM-10 Battery Internal Resistance Tester [ & Milli-Ohmmeter] Review
Paul T:
It's not too difficult to make a small adapter board for use with other connectors.
A 4-wire connection can be extended to other attachments - without any penalty, as long as the connections are reliable.
Here's an example of a round-trip cable tester setup. It's meant to determine the total resistance a cable has on the power wires. The lower the resistance, the better ampacity.
My previous milli-ohmmeter adapted to 4P header and these various attachments go to USB-A, USB-Mini, USB-Micro, USB-C. Also, I made shunts for far-end termination from good quality connectors. The resistance of the connectors at the ends of the cables are present in the product usage, so I feel it's valid to capture the entire path the way I do.
The key to adapting the FNIRSI to these components was 2x5 headers that the Kelvin clips can grab onto. 5 rows handle the pressure of the jaws better than just a few. They are all in parallel. The V+I+V-I- labels match up with my previous equipment force and sense connections.
DaneLaw:
Looks like there is a new bundled version.
with also probes and cellmount at an added cost of around +18$.
The HRM10 socket is as debated, just a standard GX12-4pin.
So you could likely also get some of the accessories for other 4wire-battery-testers using that connector, just double check the pin-out matches.
Paul T:
This is a nice kit, in theory. However, the length of the wires between the tester pens to the junction is too short, barely the length of the pen itself. If you want to aim the pens at opposing ends of the battery so that the probes are perpendicular to the face, it can't be done. :--
DaneLaw:
--- Quote from: Paul T on October 29, 2024, 09:11:33 pm ---This is a nice kit, in theory. However, the length of the wires between the tester pens to the junction is too short, barely the length of the pen itself. If you want to aim the pens at opposing ends of the battery so that the probes are perpendicular to the face, it can't be done. :--
--- End quote ---
Many of these graphical promo-display pictures, ain't 100% representative of the actual product, sizewise, they are orchestrated to make it look neat as can also be seen on the dual 90-degree angle of the cable on the probes., so hopefully they will fit their intended use-case, but then again the jaws kontra cable length are actually very close to the pictured dimension above.
These accessories would come as stand-alone spares and be purchasable for users who already purchased the HRM-10 with just jaws, not sure about the price, but the seller that sold me the HRM10 would reach out when he got them as spares.
Been testing the HRM10 on various cable-resistance, and the readings are very close to the values on YR2050 (DC-based)
TheDefpom:
I edited my review video for this today and uploaded it to YouTube (currently unlisted) will go public on Wednesday next week.
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