As I have received a "FNIRSI"
HRM-10 Battery Internal Resistor tester and recalibrated it with a Keysight U1272A DMM
(too much number on the HRM-10 tester, but after calibration it seems good at reading voltage values), I have made some strange tests after coming back at my little apartment
It seems that all Battery resistor tester are using a 1Khz signal check, so the strange idea I have had is testing ESR of capacitor with these tools
Here are the results (some surprise too see), the
master reference is of course the
ST42 Tools: Genuine YR1030 from Vapcell // HRM-10 // ST42 // DS4T252
You will see the signal output of each one with the great DS4T252, then the mesured values.
I use 2 capacitors: a brand new 1000uF/35V Nichicon from Mouser, and a dead 1000uF/25V coming from my Beringher MiniMon800 Audio Router.
Signal output of the ST42 is amazing
Photos are taken with auto-hold enabled (as always on mine
)
Also after a little time, I saw that the 2 testers starts to charge the capacitor.