Multi-Component Tester Calibration / Operation / Comparison (M8 ver. M12864)

This is another multi-component tester. This shows the calibration and use of a "Transistor Tester M8 version M12864".


https://www.youtube.com/watch?v=C38e...ature=youtu.be


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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.