The tester automatically detects the type and layout of the lead leads of the connected component, and displays the measured parameters of the tested part. The tester is powered by 9V battery and during the measurement it draws current 12-15mA, while in sleep mode it draws current 20nA.
Connect the test components to the three random (or two) available leads, the measurement starts when you press the button. Discharge the tested capacitors before capacity measurement. After unpacking the new tester, carry out the calibration, we do it by connecting the 1-2-3 lead wires with minimal resistance (e. g. with two jumpers made of silver or unnecessary resistor tips). Press the microcircuit button and start calibration, at 38% we will be asked to remove jumpers, at 82% we connect to 1-3 pre-prepared capacitor leads with capacity greater than 100nF.
Type of elements tested and parameters checked:.
capacitors: capacity 25pf-100 000uF, ESR, Vloss
bipolar NPN, PNP transistors: hFE, Uf
MOSFET field resistors N channel, channel P: gateway threshold voltage and capacity
JFET connector field resistors: Vgs, I
Dual diodes and dual diodes: conductive voltage and capacity
Resistors, resistance measurement of two resistors simultaneously: up to 50M?
Inductance 0.01mH-20H and winding resistance
You can find such possibilities in the description, but it is worth checking it yourself.
Since one picture is better than many words, below the animated gif with test results of LEDs, bipolar and field transistors, thyristor, resistors, capacitors and inductance, at the end of this text you will also find video from the device tests.
The accuracy of the M328 tester compared to the multimeter is very good.
The first column is informatively the type of element to be tested, the second column is the multimeter measurement result, the third column is the multimeter measurement uncertainty, the fourth column is the tester's measurement result, and the fifth column is the difference between multimeter and tester indication.
0,107mH / 0,08
0,012mH / 0,06
0,10mH / 0,7
0,007mH / 0,62 (775%)
5,14mH / 8,44
0,2mH / 0,09
5,23mH / 8,9
0,09mH / 0,46 (5%)
9,83mH / 14,42
0,3mH / 0,12
10.2mH / 15,0
0,37mH / 0,58 (4%)
Where the difference was at least 10x greater than the measurement uncertainty, I entered the percentage difference from the multimeter and the tester result. The Sanwa PC500a multimeter and the UT58D multimeter were used to measure resistance and capacitance.
An error is visible when measuring low resistance of inductive elements, and when measuring voltage drop on the honey (probably the tester examines diodes with a different current than the multimeter and therefore differences appeared).
I am curious what is the scattering of the parameters and what accuracy the rest of the tester will obtain, if you will carry out the tests with your testers, please write in this topic what results you have achieved. I would be happy to familiarize myself with your opinion about this useful device, which in my opinion will be useful in every workshop.
It would be useful in the workshop. The most useful is probably the measurement of inductivity. I could knit my own coils based on electronic scrap. Most cores are no-name so the inductance of such a coil is a mystery. I am waiting impatiently for the appearance of this gadget. You will need to collect some more points until then.
I have such a modified T4 yolk. There is even a topic about this model with us on the forum. Very interesting equipment, with quite nice features and generally sufficient accuracy in amateur applications. He can do more than one multimeter, being simple to use and interpret results. Well done for the idea, it will probably be useful to not one Electrodowicz!
These testers are based on the same design and the differences are only in the displays used and in the power supply method, eg a 3.7V type 14500 battery. All of them use 1%, 680? / 470k? resistors, less often with a better reference voltage, and the rest make the software. Such a graphic is also more attractive than a display of 2x 16 alphanumeric characters. The DIY version has open source code and there are often patches or some functions are added and the "Chinese" ones do not show on what version of the software they work; who corrected her. If there are any "bugs" in the software, there is no way to improve it.
For me, the accuracy of measurement is - it is sufficient. He treats it as a tester, if the elements are operational - in multimetrs I had, I did not have the large capacity measurement - here 47.000 uF without stuttering. Beta and Rds roughly and quickly determines whether the element is ok. Large distortion on the diodes - a multimeter is something else.
Hello. We just recently acquired a few such ready-made products in the cabinet, as presented on the photo @mozekam, only marked T7. How I suppose a newer version, although it looks the same from the outside. Purchased in Poland, although it is known where they were brought from. I will not advertise the store, everyone has Google. If someone does not care about delivery time, invoice, etc., it can be purchased directly from a Chinese, e.g. on Aliexpress. About $ 30. I may say: I am still impressed. Of course, this is not a superprofessional instrument, but I think it is very helpful for an amateur electronics or a workshop technician. I will even venture to say that it is indispensable nowadays. The more so because the price in relation to the possibility is very reasonable. Banal service: we connect the tested element basically almost in any way, we press Start and ... ready. If I had something like that from 30 years ago, I would probably go on the ceiling with happiness In comparison to the one presented in the first post, this "ready" additionally may: - measure Zener diodes to 30V (I checked: on pins A, K actually appears voltage around 37V), - check the infrared remote controls (IR diode visible on the casing), - has a built-in rechargeable Lion (voltage shown at the device startup), charged by a standard microUSB connector. Therefore, it is not possible to replace the battery, and you can charge from any USB port or adapter "from the cell". Anyway, there are videos on the net that present the capabilities of these devices. Greetings.
I bought it on Aliexpress - it was 3 weeks, I'm also impressed - the price is less than 30 $ - it has earned itself with a vengeance. Generally, now for Aliexpress, the electronics is a real mine - a mass of interesting devices and ideas, as if I had such a 20 years ago - I would fly like a previous speaker but even today it is useful despite less time for picking.
Mainly for making coils / chokes? Well, unless someone has such a major hobby After all, toto can detect (!) And measure (!) Almost any discrete elements from the electronics drawer (or repaired customer's equipment). You put a resistor and after a while you have a resistor and capacitor, you insert a capacitor - you have a capacitor and capacitance, diode - there is a diode (you see where A, where K, voltage drop at the connector), transistor - there is a transistor (type, field, bipolar, type connectors eg N, P, detects outputs eg where is BCE, amplification, etc.) - and so on, etc. Obviously, it probably will not recognize everything 100% correctly, eg I tried a FET transistor - it showed S and D depending on the connection (gate is always correct), it will not replace the multimeter or specialized instruments, eg RLC bridges, etc. I will say maybe : this tester will be appreciated by anyone who deals with the workshop electronics. Especially those who started their adventure some 25 or more years ago, not now when almost everything is ... ready. This device, too Greetings. PS Aha, of course, also detects / measures coils / inductance. I checked even on a fast network hit - it detected, measured, EDIT Anyway, not to beat the foam, let anyone who has not seen and interested, with a Polish teacher: https://www.youtube.com/watch?v=JmE2hxT4u2o
Does anyone know for what period of time will you get that tester and how many pieces will it be?
Do you want to receive this visit regularly shop Gulson does not say how many pieces he "throws at the store" and how long it will depend on the demand. The first batch of USB Keweisi KWS-V20 spread within a few days and now they are lying and waiting for the willing.
link The colleague has already developed and expanded this system.
Just to be clear: You are now writing about the device from the first post of the topic. I wrote about a different model, "ready", containing already option to test Zener diodes, IR remotes, battery and USB charging port, color display, and is enclosed in a housing. However, both of them allow to measure inductivity immediately, without any modifications
I did not know that there is a "color" version of this tester @mozekam great, the comparison is always useful. @ HD-VIDEO do you have a link to the DIY version of this construction with open source code? E8600 @ I expected that 775% would arouse interest, I compared the absolute difference between the result of the measurement with the multimeter and the tester's indication, where the difference was min. 10x greater than the uncertainty of the measurement with the multimeter I indicated an additional percentage, which determines how many percent of the multimeter indication is the mentioned difference in indications (this kind of error display). It just so happens that the measurement of low winding resistance is fraught with error. An example of a choke according to the multimeter had a resistance of 0.08? +/- 0.06? and the tester indicated 0.62? which is a value over 7x greater than the meter's indication, i.e. 775% @Adamcyn the store is not really, more distribution of gadgets, it is empty because everything has been chosen, there were soldering sets, there were also ESP8266: https://www.elektroda.pl/rtvforum/topic3338096.html there is a chance for many other interesting things, details here : https://www.elektroda.pl/rtvforum/viewtopic.php?p=16522042#16522042
I use an identical tester as in the first thread and for convenience and safety I put it in a practical, convenient and cheap housing with a transparent lid: The original ZIF socket is, let's say, moderate quality, and after a few times the plates are made and the elements are removed from the socket when placed in the socket will not have a good contact. The second problem related to this basis was the inability to place elements thicker than eg 1/4 resistors. In the legs - simply leads with a larger diameter than the legs of the power transistors do not fit and even destroy it. I quickly applied temporary - as it seemed to me at the time the solution, which turned out to be flawless for me and I would rather not change anything. As usual screws, insulating sleeves for transistors, eg TO220, soldered tips, washers and nuts are used. From the outside I placed a piece of laminate in case there was a need to solder the element, however, as so far, and I use a tester in this case, it was not necessary to solder for over a year. All measurements can be successfully performed by holding down the element pressed to visible terminals for a few seconds. In general, I recommend such encapsulation of the tester, cost about 20 PLN that is small, work a small amount, some glue from the gun and we are sure that nothing will damage and the tester will serve us a long time. The housing used can be found on the auctions by entering in the search engine: HERMETIC SURFACE BOX 120x80x50 S-BOX 216P, there are different sizes and shapes, which makes them applicable also to other devices in my service.
I also noticed an error when measuring BF199. The second error is the change in the displayed value depending on the battery voltage. Other inconveniences include poor display resolution of inductance and no measurement below 20 pF.
For people who order this tester, I advise you to pour the tape from the display or make a housing for the tester. Unfortunately, I managed to damage this tape, fortunately I am going to get such displays for about $ 3.5. Now even a little cheaper: http://www.gearbest.com/lcd-led-display-module/pp_530259.html
It just so happens that the measurement of low winding resistance is fraught with error. An example of a choke according to the multimeter had a resistance of 0.08? +/- 0.06? and the tester indicated 0.62? which is a value over 7x greater than the meter's indication, i.e. 775%
And you checked what the minimum resistance (short circuit) shows? Out of curiosity, I looked in my T7 - it detects a 0.00-0.01? resistor, sometimes it will "jump" 0.03-0.04, I made a short circuit on the hooks supplied in the set. PS Similarly as the pre-writers mentioned earlier, I treat the device more as a tester than a measuring instrument, although in most of the workshop applications I consider it to be sufficiently accurate. I would even say, especially considering the price - amazingly accurate
And you checked what the minimum resistance (short circuit) shows? Out of curiosity, I looked in my T7 - it detects a 0.00-0.01? resistor, sometimes it will "jump" 0.03-0.04, I made a short circuit on the hooks supplied in the set
@Stanley_P thank you for the hint, I forgot to write about the device calibration. I added calibration information to the material. In the tested unit, the measurement results are shorted as follows: 1-2 0.66? 2-3 0.00? 1-3 0.02?
@Stanley_P Thank you for the hint, I forgot to write about the device calibration.
Thank your colleague @@ GUTEK @, he used the word first
In the tested unit, a short circuit of the measurement leads gives the following results: 1-2 0.66?
And the problem of "overstated" resistance of the coil of this 0.62? reactor has probably been clarified. Try to repeat the measurements of the same element connected to the other lead combinations (1-3,2-3). Here I will add that in my T7 the measurement of resistance "short circuit" regardless of the chosen combination gives similar results of approx. 0.00-0.01?. Maybe I came across a better stand
I remembered one more thing. Only now I will not check because on this software, what I have is different. When the tester is turned on while holding down the button for a few seconds, the display contrast can be set. This probably was not written before.