Note the circuit around the three test pins TP1, TP2 and TP3 (top right corner). In the figure below we have taken the original circuit diagram of this circuit from and adapted it slightly to the electronics of the MK-168. (© 2019 Jos Verstraten)Īlthough the MK-168 comes without any documentation, the Internet offers more than enough ways to find out about the electronics of this device. It is worth noting that one has make the effort to connect the push button and the three 2 mm jacks with mini-connectors to the PCB.
It is almost impossible to show the symbols of the tested parts on such a display. That fact already indicates one limitation of the MK-168. This display has two rows of 16 alphanumeric characters of 5 x 7 dots each. On top of this PCB, a standard 1602A display is mounted via three spacers. The amazingly small amount of electronics is housed on one PCB in the device, of which the picture below shows both views. The internal or external 9 V power supply for the MK-168. Internally, the supply voltage is stabilized at 5.0 V. In the left side wall there is a hole for a standard 3.5 mm x 1.35 mm plug that allows you to connect a 9 V power supply to the MK-168. Unfortunately, no provision has been made to fix the battery, so the device will rattle quite a bit when you power it with such a battery. The device can be powered by a 9 V block battery that can be placed in the housing, see picture below.
Mk168 transistor tester manual#
The three test leads have a length of 17 cm and are equipped with a mini crocodile clamp at one end and a 2 mm plug at the other end.Īs is usually the case with this type of cheap Chinese equipment, no manual or documentation of any kind is included. The circuit board also has three tinned solder pads on which you can press SMD components to test. ZIF stands for 'Zero Insertion Force', thanks to the lever you can insert the connecting wires of the components to be tested into the socket without exerting any force. For the twenty-three euros you will not only get the transistor tester, but also three small test leads and a circuit board with a ZIF-socket for easy connection of separate transistors to the device. On some devices is written 'EZM Electronics Studio' as manufacturer, most testers are delivered without any manufacturer imprint. As is often the case with this type of device, the manufacturer is kept secret. The MK-168 is offered for prices from € 23,00 via the well-known Chinese mail order companies. It is ready-to-use, battery-powered and built into a handy housing. The MK-168 is one of the many Chinese devices that use this basic scheme. More Real Product's pictures in BLACK backgroundThe ability of a microcontroller to identify components was demonstrated by Markus Frejek on in 2009.
It can measure capacitance of 30pF- 100mF, resolution 1pF.īefore the measurement of capacitance, must to discharge the capacitor, otherwise may damage the instrument :)
Resistance measurement resolution is 0.1 ohms, 50M ohms can be measured. One button operation, automatic shutdown with only 20nA shutdown current. Key resistance using a thousandth of a metal film resistors, and the remaining use a hundredth metal film resistors.īacklit LCD screen with low power consumption, compared with the whole power consumption is almost negligible, so the light is always there, easy reading in the dark.Īutomatic recognition transistor type, pin, current magnification and the base - emitter junction voltage measured at the same time.Īutomatic Identification of N and P MOS FET type and pin, measure the gate threshold voltage and capacitance.Īutomatic identification the diode pin, measurement the forward voltage.Īutomatic identification of small power triac pin.Īutomatically detect NPN, PNP bipolar transistors, N-channel and P-channel MOS FET, JFET, diodes, dual diode, thyristor small power unidirectional and bidirectional thyristor. Microcontroller using 8MHz external crystal, better measurement accuracy. MK-168 Transistor Tester Diode Triode ESR RLC LCR Capacitance Resistance Inductance Meter MOS PNP NPN
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