Products > Test Equipment
SOLVED: “LCR-T7” tester - reliable?
py-bb:
--- Quote from: elecdonia on December 29, 2022, 06:50:25 pm ---
--- Quote from: py-bb on December 29, 2022, 02:03:47 am ---When I was buying one I was wondering about that, the specifications given on ebay listings are very poor, I decided based on pictures of things shown measured. The specs are also wrong like the one I have is supposed to top out at measuring 5Mohm, it measured 9.7 earlier.
I've also found that it'll measure certain features only between certain ports, so say 1 and 3 is generally better (measures more) than 1 and 2.
I'll take some pictures of mine soon - it can't hurt.
--- End quote ---
When you get different results testing the same resistor (or capacitor) on different ports of the transistor tester (such as 1-2, 2-3, or 1-3) this means you need to perform the "self calibration" procedure. To do this you first need to assemble 3 very short wires (< 2 inches) twisted or soldered together. Then place them into the ZIP socket on the tester to short out all three port pins at the same time (1, 2, and 3). Next press power button on tester. Display should be "selftest." After some time passes it will display "isolate probes." Now remove the shorting wires. Selftest will continue and eventually the tester will shut off. Next time you test a resistor (or capacitor) the result should be nearly identical no matter which set of test ports (1-3, 1-2, or 2-3) the component is connected to.
Note: Inductors and some other 2-wire components may require using ports 1 and 3 to test.
-E
--- End quote ---
Not what I meant, I meant like say we put a capacitor between 1 and 3, you'll get an ESR and a drop %age out of it as well as a capacitance, put the same capacitor on 1 and 2 and you get just capacitance.
"" for diodes (but different readings)
indman:
--- Quote from: eti on December 26, 2022, 06:42:25 am ---I recently saw some info where folk have bought this tester (and the “LCR-T1” variant) and had issues with them failing after a short time - something to do with caps going short.
--- End quote ---
Hi! Why create duplication and many topics for discussing the same device, if there is a global topic where this project is discussed and one of the respected authors madires participates? In this way, you are spraying valuable information that would be useful to other people.And so you have to jump from one branch to another, instead of just using a search service that normally works on the forum. :--
eti:
--- Quote from: indman on December 30, 2022, 07:55:48 am ---
--- Quote from: eti on December 26, 2022, 06:42:25 am ---I recently saw some info where folk have bought this tester (and the “LCR-T1” variant) and had issues with them failing after a short time - something to do with caps going short.
--- End quote ---
Hi! Why create duplication and many topics for discussing the same device, if there is a global topic where this project is discussed and one of the respected authors madires participates? In this way, you are spraying valuable information that would be useful to other people.And so you have to jump from one branch to another, instead of just using a search service that normally works on the forum. :--
--- End quote ---
Good point. Thanks. Happy 2023! Thanks for your hard work. It’s appreciated.
elecdonia:
--- Quote from: py-bb on December 29, 2022, 07:08:58 pm ---
--- Quote from: elecdonia on December 29, 2022, 06:50:25 pm ---
--- Quote from: py-bb on December 29, 2022, 02:03:47 am ---I've also found that it'll measure certain features only between certain ports, so say 1 and 3 is generally better (measures more) than 1 and 2.
--- End quote ---
When you get different results testing the same resistor (or capacitor) on different ports of the transistor tester (such as 1-2, 2-3, or 1-3) this means you need to perform the "self calibration" procedure. Note: Inductors and some other 2-wire components may require using ports 1 and 3 to test.
--- End quote ---
Not what I meant, I meant like say we put a capacitor between 1 and 3, you'll get an ESR and a drop %age out of it as well as a capacitance, put the same capacitor on 1 and 2 and you get just capacitance
--- End quote ---
Yes, there are enhanced measurement features for capacitors and inductors. These function only with ports 1-3. Availability of these features depends on which firmware is in the tester. I need to re-read the official transistor tester documentation again - I know these enhanced features exist but I haven’t yet studied them in depth.
py-bb:
--- Quote from: elecdonia on December 30, 2022, 04:07:05 pm ---
--- Quote from: py-bb on December 29, 2022, 07:08:58 pm ---
--- Quote from: elecdonia on December 29, 2022, 06:50:25 pm ---
--- Quote from: py-bb on December 29, 2022, 02:03:47 am ---I've also found that it'll measure certain features only between certain ports, so say 1 and 3 is generally better (measures more) than 1 and 2.
--- End quote ---
When you get different results testing the same resistor (or capacitor) on different ports of the transistor tester (such as 1-2, 2-3, or 1-3) this means you need to perform the "self calibration" procedure. Note: Inductors and some other 2-wire components may require using ports 1 and 3 to test.
--- End quote ---
Not what I meant, I meant like say we put a capacitor between 1 and 3, you'll get an ESR and a drop %age out of it as well as a capacitance, put the same capacitor on 1 and 2 and you get just capacitance
--- End quote ---
Yes, there are enhanced measurement features for capacitors and inductors. These function only with ports 1-3. Availability of these features depends on which firmware is in the tester. I need to re-read the official transistor tester documentation again - I know these enhanced features exist but I haven’t yet studied them in depth.
--- End quote ---
Whoa whoa whoa: you found a manual? - I got nothing with mine. I had to discover the 1-3 port thing!
BTW mine says T7 but if I do that firmware trick (press power button 4 times - I needed to unplug the battery to get it out of "bootloader mode") it says TC1 bootloader!
Also mine has wrong specs, ebay's listing said it could measure up to 5Mohm - I've tested 9.4Mohm just fine - I've not seen how high it can go.
Share the manual!
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