Multi-Component Tester Calibration / Operation / Comparison (M8 ver. M12864) (4K)
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- Опубликовано: 12 июн 2024
- Calibration and use of multi-component "Transistor Tester M8 version M12864". I will put together another video using it, and a third comparing it to another brand of tester.
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Price: About $15 (no case)
Battery: 9V
From the company's manual (edited):
Measurable components include many 2 and 3 lead components:
Resistors, capacitors, potentiometers, inductors, diodes, LEDs,
transistors, field-effect transistors, thyristors, and others.
To start press in on the digital selector. Test starts after 2 seconds. Tester auto shuts off after 28 seconds. Do not touch part or leads or socket or test points when testing.
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RESISTORS Measurement (1K，0.05% tol , 470K 0.1% tol):
2 resistors can be measured with values with up to 4 decimal digits in the right dimension. All symbols are surrounded by the probe numbers of the Tester (TP 1,2,3). Potentiometers can be measured. Adjust towards middle. Resolution of resistor measurement is to 0.01Ω, values up to 50MΩ are detected.
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CAPACITORS: ALWAYS DISCHARGE CAPACITORS BEFORE PLACING IN TESTER!
WARNING: CAPACITORS CAN SHOCK AND KILL. USE PROPER PRECAUTIONS!
Polarity of caps is usually not critical (electrolytic capacitors). But for certainty, put the negative lead in the port with the lower number (-1+2, -1+3, -2+3)). (Note: measurement voltage is between 0.3 V to 1.3 V so the polarity is not critical for most electrolytics). Time to measure capacitors increases with larger caps.
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Non-Polarized Capacitance Measurement (1800PF 1% tol and 100nF 1% tol):
Symbol and value with up to four decimal digits in the right dimension are displayed. The value can be from 25pF to 100mF (100,000uF).
The resolution can be up to 1pF (@8MHz clock). For capacity above 90nF the Equivalent Serial Resistance (ESR) is measured with a resolution of 0.01Ω and is shown with two significant decimal digits. For capacitors with a value above 5000pF the voltage loss after a load pulse
can be determined. The voltage loss give a hint for the quality factor of the capacitor.
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Electrolytic capacitors： When the capacity value is
greater than 90NF it will display the ESR value. Polarity is not critical.
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INDUCTANCE Measurement (0.1mH):
The range is 0.01mH to greater than 20H, but the accuracy is low. For resistors less than 2100Ω the inductance will be shown.
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TRANSISTOR Measurement (2SA1941):
Display the Collector cutoff current Iceo with current-less base
(10uA units) and Collector residual current Ices with base hold
to emitter level. This values are shown only if they are not zero
(especially for Germanium transistors).
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THYRISTOR Measurement (MCR100):
Thyristors and Triacs can only be detected, if the test current is
above the holding current. Some Thyristors and Triacs need as
higher gate trigger current than this Tester can deliver. The
available testing current is only about 6mA.
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OPTIONAL MENU FUNCTIONS FOR THE ATmega328
FREQUENCY Measurement： signal input at F-in GND, Max input signal less than 5V.
Below 25kHz, average is displayed with a resolution of 0.001Hz.
Stops with digital selector press.
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FREQUENCY GENERATOR (between test points 2&3)： Set frequencies are available. Dial then select with start / stop with digital selector press.
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10-bit PWM (@test points TP2&3)(Pulse Width Modulation): Fixed frequency select-able pulse width at the pin TP2. Stop with long digital selector press (greater than 1.3 s).
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C+ESR (@test points TP1&3):stand-alone capacity measurement Equivalent Series Resistance (ESR) WARNING: Ensure that no residual voltage remains in the equipment! Capacitance from 2uF up to 50mF. Measurement voltage is about 300mV, so in many cases the capacitor can be measured "in circuit".
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ROTARY ENCODER: disable
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SELF-TEST: With the menu function "Self-test" a full self-test with calibration is done. With that call all the test functions T1 to T7 and also the calibration with external capacitor is done every time.
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SWITCH OFF: Switch off tester immediately.
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SHOW DATA: Shows the version number of the software and the calibration data.
@google 
Наука
Thanks for a great demonstration, I bought one, kit, for about four bucks, the red one, a couple hours to assemble, calibrate as per your video, and I've cleaned up one box of unknown parts, and segregated them. I would've paid a hundred bucks for one of these, twenty years ago, nice to have now. Thanks again, great demonstration
I'm glad it was useful.
I really need one of these testers. The one on the right seems to do the same job as the one on the left, but the right one seems better to me. Thanks for doing a showdown between them. It’s helped me make up my mind. I’ll order with your link if there is one posted. Thanks again.
@tsbrownie , I came here finding some data sheet on the left one, and found more than that! Seems that calibration method works fine, too. Thanks a lot!
I am only thinking...: over the "do not dispose" symbol, there are two passthroug pads. What are They for? In some pre-assembled ones, there is a hole ("window") that claims to "read IR codes from remote controls"...but I could not find anywhere info about that. Anyone has?
Me too, I saw that and can't find anything on it. Someone referenced it, but supplied no info.
@@RI-ns8wz It looks like they are connected to the crystal. I suppose that probing them would show an 8 MHz square wave.
You can easily calibrate the one with the yellow PCB. Just insert a jumper between 1-2-3 like the other and press test, it will automatically go into calibration
Thank you, I will try that.
Thanks for this info i had no idea this was hidden in the unit :-)
I've been thinking of putting together some electic devices and can get boards and the parts at good prices. One of these units maybe very helpfull to ID parts, so less like to put in wrong ones. Even years ago with better eye sight, it could be hard to ID alot of parts, alot are smaller know too.
I like the video, interesting comparison. Are they only available in self assembly 'kit' ??
I have seen them assembled.
Working batteries don't get recognized from this device but a dead one shows up as a diode.
The ESR was wildly off on the red one. Have you tested it with more caps? And tested some caps in circuits like it says it will do?
Have tested it with lots of caps since and it seems to be pretty close. Never tried it with caps in circuit.
Both can be calibrated. Just short 1-2-3. Press test and follow the screen instructions. Need a cap > 100nF.
Nice
Great video. To probe pulse transformers it's necesary to know isolation, do you know some equipment to do this. Thank you.
No, sorry I don't. I've done very rough measurements using a frequency generator and voltage meter, but I think you're looking for something more.
@@tsbrownie Thank you !
Not sure it matters, but you have a fresh battery in the M8 and a tired one in the M12864. Could affect accuracy. I have an M8 and a GM328, the latter an upgraded version of your M12864. Both these units came with problems. The M8 got stepped on before it arrived and the display glass was broken. I ended up replacing the display - not exactly an economical repair but it did teach me a bit on how to repair these units. The G328 case was hopelessly mis-fit to the circuit board and had to be Dremel adjusted to make it fit. If you're the bumble-fingers type you probably shouldn't try either of these repairs. The G328 also uses a smaller font which allows more data to appear on the screen, which I like. As you say, take the accuracy with a grain of salt, but these units do help in diagnosing good vs bad and in identifying unknown components.
Good point. I also got another high value cap / inductor meter and after a few months it quit. Seems I will be trying to replace a chip on it per others on the internet with the same problem. Too bad they don't put more effort in quality in these things. I'd rather pay a few bucks more and have them be reliable.
I have the unit on the left I have found that if I flip inductors over they sometimes read correctly.
That's an interesting observation. I will have to check that out.
what is the value of the capacitor used to calibrate with? Is it 100nf or 200nf? Thanks
Could you tell me what is the difference between the GM328 and GM328A versions?
Good question. I did a search and everything I could find that claimed to compare does not. I found references to the "A" version from 4 years back, so it's not really new. Wish I could help more.
Hi. If we replace it with a 16 MHz crystal, can we measure more accurately? For the LCR T4 model. Thnx.
I don't know. To be honest I have not even thought of that.
Do you know if it's possible to test two components at a time on one tester?
I do not think so.
Does anyone know at which Frequency is Inductance tested with this unit? thank you so much
The specs are in the description. It does not specifically mention inductance, but under capacitance it says it's at 8 MHz.
@@tsbrownie Hi mate, it doesn’t say in the specs or in any other doc at which frequency in Inductance measure. Thats what I would to figure out. Thanks
@@tsbrownieHi. If we replace it with a 16 MHz crystal, can we measure more accurately? For the LCR T4 model. Thnx.
B is HFE or more accurately BETA!!! (the transistors gain)
did you calibrate it with a 200nf when it was asking for a 100nf?
I used the capacitor they supplied. There are lots of numbers they show on the screen when it is calibrating, I assume some are the internal values of the device. So when it says 100 nF, it might be the base line of the device, don't know. The instructions don't explain what is being displayed.
@@tsbrownie ok thanks. I don't think mine came with the capacitor, do you know the value?
yellow or red??
What the capacitor number that they send you with it ?
Sorry I don't recall. It got mixed in with my other caps. It was something like 25pF.
@@tsbrownie sorry . I was asking about the calibration capacitor that you use
@@abeditani8293 I understand, but I put it in my cap box and forgot which one it was. Sorry
At 3:10 the tester asks for an over 100nF [0.1uF]
at 3:53 it's read as a 220nF [0.22uF]
You mentioned that the tester on the left can not be calibrated but I found a RUclips video of someone doing it. It looks like you are suppose to connect a wire to pins 1 2 3 and turn it on just like the tester on the right. Maybe they had different firmware?
ruclips.net/video/epIeS7Rk3EA/видео.html
Yes, it is very similar. I will have to check into that. Thanks.
@@tsbrownie Awesome! Thanks.
ty to u but writing was hindered the vision
Mine arrived with no knob, no instructions & I have yet to figure out how to assemble the damned case !
I understand. Lots of kits from "overseas" come with zero or poor instructions. Many are less than complete.
Mine arrived with no case and no capacitor etc
mine never arrived
B is Beta
Hfe AKA Beta
I was going to write the same comment! 😁