Products > Test Equipment

TC1 lcr-meter transistor-tester fix

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madires:
I'm not sure about the exact current draw of the TC-1 since the boost converter also creates the 40+ V for the Zener check. OP zappenduster measured 300-400 mA which are quite high. The standard circuit needs about 20mA @ 5V on average. Add the backlight, the Zener test voltage and a possibly low efficiency boost converter.

belzrebuth:
I could try applying 5V at the output of the 5V regulator and measure the current draw at that rail to check if it's within this figure (20mA) or so.


Another thing I wanted to ask if it's normal for the tester to repeat a component test for 5 retries instead of just freezing at the component measurements.


With a component at the input terminal it just shows the result and then repeats the measurement for 5 times.
Without a component it does 5 retries displaying "no component" and then switches off.

madires:
Either press the start button for > 300 ms when powering on or enable UI_AUTOHOLD in config.h. There are many configuration switches to optimize the firmware for your needs.

indman:

--- Quote from: madires on June 08, 2021, 07:01:44 pm --- OP zappenduster measured 300-400 mA which are quite high.

--- End quote ---
Yes, this is the amount of current I measured on my TC-1 with a 3.7 V power supply at the time of launch. Later the current value can be kept at the level of 150mA.This is quite high,so the circuit requires a fairly capacious battery. From the +5V power supply, the circuit together with the display backlight consumes up to 30-50mA.

peteb2:
So to take the thread into another (massive apologies) direction.... i have owned a TC1 for the last 4+ yrs & today just when i need it the battery is discharged... So as usual i've set it onto charge but this time.... NoGo! So here's my quandary:

Replace the internal rechargable LiOn looking thing...& if i do that i might as well replace the ZiF socket that is hammered on '1,2,3' on a thing with a now yellowed coloured case with soldering iron burns *OR*...  do i stump up for a new (probably badly made knockup rendition) *OR* is there a better alternative?

I'm thinking a USB interface breakout module that interfaces with workbench PC that runs what the TC1 did and does in a GUI on screen, the same kind of thing but more accuracy ...please i'm a tech who fixes a lot of gear & yes i should at least fix my own old TC1, but is there a better alternative by any chance & not waste time o this used to death thing?  I already own a Peak DCApro semiconductor USB curve tracer tester but it appears to have a lower range of ability than my old TC1...  tia :scared:

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