[NEW] FNIRSI HRM-10 ⭐ Battery Internal Resistance Tester

[@shlomsi2000]

Most internal battery resistance meters can also function as a resistance meter for plain resistors, this is very useful for very low resistors (wires, shunt resistors), you just can not get this low and accurate with a regular multimeter. And if you want to check the calibration of this meter, just get a piece of known gauge copper wire, and look at a table for the resistance and compare, very easy

[@ryanstanley2985]

Like to see Victor VC97 review too.

[@pault6533]

Version 0.3 is available for download. My unit shipped with 0.4 (just received it directly from FNIRSI) V0.3 20240620 1. Updated some English translations 2. Fixed some operational anomalies V0.2 20240430 1. Updated some clocks that could not be saved after power off V0.1 20240425 1. Updated the automatic shutdown issue

[@khuongathebounga4141]

Thanks for reviewing this. I was actually thinking of buying this tester. I know you mentioned that you didn’t have another battery tester to compare the internal resistance, but do you know if its voltage reading was accurate? If you get a chance to, are you able to use your Siglent desktop multimeter to make a few comparisons because i believe that meter is your most reliable and accurate meter. Thanks again Hugo. You’re nearly at 10k subs!! Congratulations!!

[@paulthomas4917]

The accuracy of the voltage reading oddly isn't important, I know how odd that sounds. imagine the voltmeter was 50% in error i.e. a 12 volt battery read 18 volts, all that you have to do to find the internal resistance of that 12 volt battery is to monitor the voltmeter (which is reading 18 volts when the actual value is 12) apply a load across the battery under test such that the reading on the voltmeter is half the offload voltage (9 volts) the the load resistor value is the same as the internal resistance of the battery. Now here is your homework lol, why is that so, hint potential divider.

[@khuongathebounga4141]

@@paulthomas4917 Thank you for giving me those tips and you made some really great points. As the saying goes, “You learn something new everyday”. I appreciate you sharing that.

[@paulthomas4917]

Hmm, if you wanted to check the accuracy of that meter you would only have to understand what it is doing to get a result. What the meter does is measure the battery voltage off load and then measure the battery again with a load. Therefore, when the meter tells you that a given battery is say 3.6 volts with a resistance of 0.1R You could take your multimeter, connect it across the battery note the voltage and then connect a 0.1R resistor across the battery and if the meter was correct your multimeter should read 1/2 of 3.6Volts (1.8) . Obviously you could used any value load resistor but for accuracy the bigger deflection cause by the load the better. Think of it as the internal resistance and the load resistor are forming a potential divider hence the reason you get 1/2 the battery voltage with a resistor of the same value as the internal resistor. An interesting meter, I would be suspicious of its suitability on a car battery, however. Great video, thank you

[@pault6533]

I agree with this post. Also When you are testing new cells you could compare results against the data sheet. Take into consideration whether the cell has built in protection circuit. Finally, those data sheets should tell you what SOC the cell’s internal resistance is to be inspected. Usually at or near full charge.

[@paulthomas4917]

@@pault6533 Yes, If you simply had a value of a cell's internal resistance (which neessurally would have to be when the Cell(s) are charged) this would only tell you what the maximum current you could pull for a give voltage. Only having what the value of the internal resistance should be would the value you have measured be of real value. That said, when TC measured his wife's car battery, I think t showed 0.1R, if that was so when she cranked the engine, the starter motor would have had 2 Volts, and the internal resistance of the battery would have had 10 volts! Yet, turning the ignition key and seeing the dash lights dim, would have told the same story. I think making one of these testers would be appealing, particularly if you had it as an addition to your multimeter which had the ability to capture the min and max voltage since then you would only need a test button, resistor, and if you are dumb like me, a calculator to perform ohms law.

[@jaanbhanoojo1984]

Sir could you please guid me Which one should i select For 1mhz sine and square wave signal Especially for square wave signal like ups power supply testing And i want buy it from your description link will i get all accessories Dso1511g Dso153 ET120m ET120mpro Fnirisi 5012

[@ciprianwinerElectronicManiac]

Damn, I wanna slap myself for not seeing this meter on the market when I bought my YR1030 meter. This one has a nice screen at least. Also that white battery is Ni-Mh.

[@LawpickingLocksmith]

OMG, I have yet to measure my car battery with it.