A tester of LCR - T3 components, Yes, but still?


testeur_composants_-lcr-t3 photo de l'appareil a few weeks ago, François presented on Facebook a little tester of components at the very affordable price. Very interested I immediately ordered this little module to see what he had in my stomach.
After a wait of several weeks ( well Yes, cargo Chinese in there every day ) I finally get my little package well protected by packaging bubble paper, , and here are a few tests that I could make, and my impressions.


the tester


opening, constitution


testeur_composants_-lcr-t3 emballage en papier bulle et polystyrène the package arrived well packaged in paper bubbles and other layers of styrofoam, which foreshadows a small battle with my scissors.


testeur_composants_-lcr-t3 photo de l'appareil stroke of luck, I got the version already mounted, on the net several websites announce a kit, but there is not much soldering: the push button, the support clamps and the power cable.


then what is there on this circuit board?


testeur_composants_-lcr-t3 photo de la face arrière de l'appareil - Côté composants


the heart of the tester is a microcontroller Atmel Atmega 328P, then there’s a graphic LCD display of 5,5 x 3cm, a start-up, a push button Connector ZIF (Zero Insertion Force) and a handful of SMD components to operate the µcontroleur and generate the necessary test analog signals.


power, when is she, entrusted to a linear regulator classic 78L 05 . The inspection of the circuit reveals a correct quality of welds. On my copy, I had no evidence of flow stripping generally present on the (very) low-cost trunks, or solder balls. The achievement is so neat, the drawing of the circuit board is well done with the double face (at least) of both mass and vias ( through ) conducted with eyelets and no legs of resistances. More screen printing is also present and of good quality, it provides information about the different possible connections for testing, terminals 1, 2 and 3 on the ZIF connector as well as an area to test for SMD components ( components mounted on the Surface ).


commissioning.


the 78L 05 regulator allows to power the tester with a DC voltage in a range of 7-35v, it leaves the choice! I haven’t seen diodes at the entrance of food, so pay attention to the polarity reversals, the 78L 05 is may be rustic, but the other components are more sensitive. Come on! I’m starting. I connect a 9v battery and press the yellow button, Ho! of life!


testeur_composants_-lcr-t3 photo de l'appareil montrant l'écran de démarrage the first screen is the contrast preset (at 26 for me). To adjust it, the push to increment it. Once the desired affect value, wait and the test program begins. If like me you have too press, arrived at 60 value back to 1 and continues to increment is. During the next few starts, the setting will be more requested. To make the adjustment later, simply remove the battery, hold the button and reconnect the battery: the setting screen will be available again.


then the next powered; the screen shows us the version of the software and the voltage of the battery for approx. 3 seconds. During these 3 s it also performs tests, if any component is connected the display will show: “ No, unknow or damaged part ” pretty explicit.


to perform a test, he will have to plug a component on inputs 1, 2 or 3 of the connector. With silkscreen, easily identified the clamps that correspond to different inputs. In addition they have been evenly distributed optimal on the connector, in order to test components with different pinouts and varied.


passive components


resistors, capacitors, chokes… we’re going to test everything.


first to move to the bench, a resistance of 100Ω 1% and first result: 100.2 the precision is there, we can go up to 50MΩ.


as you can see in the photo, the resistance is connected between 1 and 3. The order of the legs is irrelevant so, we could also use 1 and 2 or 2 and 3.


testeur_composants_-lcr-t3 photo de l'appareil montrant le résultat d'un test de résistance.


the following, a potentiometer, we must use the 3 entries, but still in no particular order. The tester detects two resistors which sum to the value of the potentiometer. By varying the cursor and raising a test values should vary, but the amount remains the same.


in the same way, a capacitor will be correctly identified whether chemical, polystyrene or ceramics. Some capacitors have a tolerance of 20%, hence a difference between marking the values and measured. This has happened only to a ceramic capacitor.


testeur_composants_-lcr-t3 photo de l'appareil montrant le résultat d'un test de condensateur céramique.


for them selfs or other coils and inductors the process remains the same. You can also read on the screen, the series resistance of capacitors and the selfs and the parameter Vloss which corresponds to the loss of power of the component.


testeur_composants_-lcr-t3 photo de l'appareil montrant le résultat d'un test de condensateur plastiquetesteur_composants_-lcr-t3 photo de l'appareil montrant le résultat d'un test de condensateur électrochimique. for them selfs or other coils and inductors the process remains the same. You can also read on the screen, the series resistance of capacitors and the selfs and the parameter Vloss which corresponds to the loss of power of the component.


testeur_composants_-lcr-t3 photo de l'appareil montrant le résultat d'un test d'inductance.
the active components.


a little more complicated: transistors, diodes, and sisters. Hey well no, our little Tester is doing well.


testeur_composants_-lcr-t3 photo de l'appareil montrant le résultat d'une double diode


the identification of diodes unfolds like clockwork, a small drawing shows the pinout of the component and of course, voltage junction as well as the capacity of the junction (useful for the choice of varactor diodes lovers remains superheterodyne and Colpitts .) I tried to set him up with a double diode in case TO220, but it’s me who got screwed, the result falls without appeal, pinout is correct as well as the two threshold voltages. The only downside is the Zener diodes , with a supply voltage of 5v. Impossible to measure Zener voltages higher than this one, we will be so as only measure the voltage drop of the diode.


testeur_composants_-lcr-t3 photo de l'appareil montrant le résultat d'un test de transistor PNP I could identify NPN transistors , PNP , MOSFET N and MOSFET P . I didn’t TRIAC or jFET handy for testing. For bipolar transistors, in addition to the pinout, we have the information of sender base threshold voltage ( vbe ) and gain ( hfe ). It is interesting to be able to pair transistors, as in some audio editing or oscillators.


testeur_composants_-lcr-t3 photo de l'appareil montrant le résultat d'un test de transistor MOS


in regards to the MOSFETs, we got the gate source threshold voltage ( vgs or vt ) and gate capacity, important for the choice of driver MOS or the choice of transistors for fast switching.


testeur_composants_-lcr-t3 photo de l'appareil montrant le résultat d'un test de diode LED


you can see on the pictures that the sense of connection does not matter, the tester adapts well different configurations. We forgot a component that is used very often… the LED.
OK, this is a diode and like her friends not luminescent, direct, here higher voltage display and the capacity of the junction.


the SMD components


as announced in the description, there is a place made of tinned pellets non varnished just between the ZIF connector and push button. The pads are wisely willing to test a wide variety of cases to rise to the surface. Silkscreen shows the different entries of measures. It’s quite small so don’t forget the tongs to place the component to test.


testeur_composants_-lcr-t3 photo de l'appareil montrant le résultat d'un test de condensateur électrochimique CMS


I bought this tester for less than € 10 on internet. There may not be the precision of a professional camera (although…) but we saw with 100Ω resistance which was less than 1%. This covers the vast majority of the components that we use on a daily basis. With its reduced but well-studied forms, it is easily integrable in a small box or a multifunction console.


testeur_composants_-lcr-t3 photo du dessous de l'appareil montrant l'emplacement du conneteur ISP de programmation du microcontrôleur


I think he’ll be part of electric devices constantly present on my (very crowded) established. A little bonus, on the underside of the circuit, we can see a 6 pin connector that corresponds to the pins of the ATMEGA328 programming.


testeur_composants_-lcr-t3 photo de l'appareil montrant le résultat d'un test de fusible avec un message d'erreur uh… it works for fuses 😉



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