Whoops

Re: ATMega based LCRs
« Reply #20 on: May 18, 2017, 08:25:03 PM »
Very nice Link and tests.

Thank you Ungifted


ungifted

Re: ATMega based LCRs
« Reply #21 on: May 19, 2017, 03:27:59 AM »
Thank you for your feedbacks and support!
http://diy-tubes.com - parts for guitar/studio gear

Whoops

Re: ATMega based LCRs
« Reply #22 on: May 24, 2017, 04:34:47 PM »
Hi Ungifted I just checked my MK-328 tester and it already came with the firmware V1.12K

Do you know if this meter takes into account (subtracts) Leakage from the HFE measurement when measuring HFE of germanium transistors?



« Last Edit: May 24, 2017, 11:33:51 PM by Whoops »

ruffrecords

Re: ATMega based LCRs
« Reply #23 on: June 10, 2017, 04:37:23 PM »
Can anyone recommend a good one of these that will test JFETs? The one I have just identifies them as a pair of diodes and gives the forward voltage drop.

Cheers

Ian
www.customtubeconsoles.com
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

ungifted

Re: ATMega based LCRs
« Reply #24 on: June 10, 2017, 07:27:38 PM »
Whoops Yes, it takes into account leakage when measuring germanium transistors, please check 1.12k datasheet
https://github.com/svn2github/transistortester/tree/master/Doku/tags/english/ttester_eng112k.pdf
ruffrecords
At least MK328 must measure JFETS, not so in detail as DCA75 but it it must identify them correctly. I saw jfets as a diode junction with fake J201s or SK170s when their gain is too low or possibly other reasons. BTW even mk328 with 1.12k doesn't show Vgs (off) though it must (see docs). Only Vg (on) shown.
Please note that every transistor tester from China with 1.12k must identify jfets. But stock firmware of T3-T4 as instance identify them as BJT.
http://diy-tubes.com - parts for guitar/studio gear

Re: ATMega based LCRs
« Reply #25 on: July 01, 2017, 10:25:21 PM »
I just tried the one pictured here:

http://www.instructables.com/id/AVR-Transistor-Tester/

and it was a total fail for measuring JFETs. I manually measured Idss of a J201 at 390uA and the tester reported 220uA.

I tried to calibrate but it didn't make any difference.

Whoops

Re: ATMega based LCRs
« Reply #26 on: July 02, 2017, 03:34:21 PM »
Wow. Not bad for under $15. I can deal with +-0.6% for on-the-fly measurements.

yes, probably not bad even if it cost $150

lololol