Products > Test Equipment
TC1 lcr-meter transistor-tester fix
madires:
Your TC1 seems to be another variation with two separate boost converters. To verify the output voltage for the Zener test you could reverse engineer the boost converter (IC and feedback voltage divider).
chris2u:
Looking at the first set of specs from AliExpress, it mentions 20V for zener....Then later specs show 30V..So yes, like a covid 19 variant ...Needs another booster!. 8)
https://www.aliexpress.com/item/4001208715581.html?spm=a2g0o.detail.1000023.1.67d0549fikoqen
indman:
--- Quote from: chris2u on January 29, 2022, 03:44:20 pm ---The zener test voltage is 23.1V (Not over 30v as other units are) and am wondering if this is normal for this model ?
--- End quote ---
Yes, this is normal, because as a DC-DC converter chip is used SDB628, which can adjust the output voltage range to a maximum of 28V! Exactly the same chip is used to produce a 7-9V input voltage for a 7805 stabilizer.
Felipe Lacerda:
--- Quote from: chris2u on January 30, 2022, 07:09:15 am ---Looking at the first set of specs from AliExpress, it mentions 20V for zener....Then later specs show 30V..So yes, like a covid 19 variant ...Needs another booster!. 8)
https://www.aliexpress.com/item/4001208715581.html?spm=a2g0o.detail.1000023.1.67d0549fikoqen
--- End quote ---
TC-T7-H is the best version available? Is this seller reliable?
chris2u:
What I think would be nice is if you could change the colors allocated to the three inputs.
This way I could have (1) Red, (2) Black, (3) Green, which was the color of the supplied leads and test hooks.
It's would be a lot easier to identify what lead is what and what is base, collector and emitter and so on if things are the same colors throughout.
ATM I'm having to order purple test clips from China as there are not too many around locally.
Maybe some firmware genius could come up with a solution..
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