Products > Test Equipment
Hantek LCR 1832C unlock
ru_tash:
--- Quote from: wind999 on March 03, 2024, 08:32:27 am ---NO. Before the upgrade, i have installed LCR2023041001, too. That's why i made just in case backup of the ROM.Luckily i don't need any more.
So, you can go directly to 1833cDump and then you can upgrade again with LCR2023041001.
Downgrade is possible because you are changing the entire ROM 512KB with the dump. I think there is no safety switch or R/W block something like that in the software or in the hardware level.
MOST important, DO NOT change the RC C66-C69 Capacitors as Yuri said.
--- End quote ---
through your tables I see that measured data of resistors was changed a little, that is reasonable as you installed another device's ROMdump which was probably calibrated to that particular unit.
so to speak, trade-off to get full functionality.
do you have precision resistors to check accuracy after all?
wind999:
Im waiting them. These days AliExpress is very slow. Probably in April. When i get them i will post the results.
tom55:
did any of you check capacitors and inductors at 100khz? especially small inductance like 2.2uH - i have problems with these in default fw (2021) did not upgrade or mod anything yet, the value often drifts down, a good 2.2uH showing as low as 1.8uH
update: installed 20230410AM version. it is stable now
ridiculous that they can't email it when asked or put on the website, but you have to hope somebody else got it and uploaded
tom55:
damnit this is still not good
i check 2.2uH and 2.4uH, at 4khz it looks accurate, at 10khz values go up way too much 2.7uH and 3.1uH
at 40khz still not stable when 2.2 measured 1.93uH, 2.4 was 2.1uH
also 40khz 2.2 was 2.1uH and 2.4 was 2.24uH
4-wire with shorting calibration used. seems like only fixed instability due to some signal breaks every 20 sec as guys here noticed previously. change component being tested or up/down frequency, it acts up with result
update: when it was stable, i tried to check 68nH inductor. reading was 0.065uH so pretty close
also noticed with 2023 fw the charging is now steady and takes more than 6 hours, while with previous version the draw from wall was jumping up an down all the time.
remains to see if the battery will last any longer
ru_tash:
--- Quote from: tom55 on May 27, 2024, 06:40:02 pm ---
update: when it was stable, i tried to check 68nH inductor. reading was 0.065uH so pretty close
--- End quote ---
one thing I noticed - the calibration state depend on how "good you powered it on", that is when I powered on with metal jumper inserted and L measured mode, some times it is not zero, I need series on-off cycles to get zero readings.
it looks like that calibration data stored in memory but to activate it you need to power on with random positive effect.
so, instead of every time (after power on) to do calibration I do on-off cycles until get zero readings.
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