This graphical multi function tester is composed of resistance + capacitance + diode + inductor + transistor +mos. LCD 12864 LCD display, with a backlight, backlight color is generally yellow green. Power supply for 9V stacked battery. If for long time power supply, it can use 2 lithium battery composition of 8.4v battery as power supply. Function: *Added boot voltage detection function. *Automatic detection of NPN and PNP transistors, N channel and P channel MOSFET, diodes (including dual diode), thyristor, transistors, resistors and capacitors and other components. *Automatically test the pin of the element and display it on the LCD. *The positive bias voltage of the emitter transistor can be determined by detecting the amplification factor and the base of the transistor, the MOSFET protection diode, etc. *Measurement of gate threshold voltage and gate capacitance of MOSFET. *Display using 12864 LCD LCD (128*64 characters). *Higher test speed, effective component test: in 2 seconds (except for the larger capacitor, the measurement of large capacitance also takes a long time to measure the time for 1 minutes is normal). *One key operation, power on to test, one key to get the work done. *Power consumption off mode: less than 20 nA *Automatic shutdown function can avoid unnecessary waste, save battery energy, improve the life time. Features: 1. Using ATmega8, ATmega168 micro controller. 2. 2x16 character LCD display results. 3. One key operation, auto power off. 4. Turn off current is only 20nA, support battery operation. 5. Low cost versions do not support crystal, auto power off. 1.05k version of the software ATmega168 using the sleep mode to reduce power consumption in the absence of measurement. 6. Automatic detection of PNP and NPN bipolar transistor, N, P channel MOSFET, JFET, diode, dual diode, thyristor controlled silicon. 7. Automatic detection of pin layout. 8. The threshold voltage and current measurement of bipolar transistor amplification and emitter junction. 9. Darlington through the transistor can be a high threshold voltage and high current amplification factor identification. 10. For the bipolar transistor, diode detection and protection of MOSFET. 11. The threshold voltage and gate capacitance measurement value of MOSFET. 12. Measurement and symbol support two resistance showed that the highest four digits and the display unit. Resistance symbol display is connected to the tester probe (1-3). It can also measure the potentiometer. If the potentiometer is adjusted to the end of it, the tester can not distinguish between the middle and both ends of the pin. 13. The resolution of the resistance measurement is 0.1 ohm, the highest measured value of 50M ohm. 14. Can be detected and measured by a capacitor. Highest four digit number and unit display. Values can be from 25pf (8MHz clock, 1MHz 50pF@ clock) to 100mF. Resolution up to 1 pF (@ 8MHz clock). 15. The equivalent series resistance (ESR) capacitance value of the capacitor can be measured in the 2UF value. The resolution is 0.01 ohm and the two digit value is displayed. This feature requires at least 16K flash ATMEGA (ATmega168). 16. Two diodes can display the correct direction of the symbol. In addition, the forward voltage drop is shown. 17. LED is detected as a diode, the forward voltage drop is much higher than the normal. Dual light emitting diode detector for dual diode. 18. Zener diode can be detected if the reverse breakdown voltage is lower than 4.5V. This will be shown as two diodes that can only be determined by voltage. The probe surrounds the diode symbol is the same in this case, you can identify the diode real anode by 700mV near the threshold voltage! 19. If more than 3 diode classes are detected, the number of diodes is built to display additional failed messages. This will only happen if the diode is connected to all three probes and at least one is the type diode. In this case, you should only connect the two probes and start the measurement again, one by one. 20. The capacitance measurement of single diode reverse value. The bipolar transistor can also measure, if you connect the base and the collector or emitter. 21. Only one out of the whole bridge connecting measurement. 22. The 25pf value lower than the capacitor is usually not detected, but with a diode in parallel or at least 25pf shunt capacitor. In this case, you must subtract the capacitance of the parallel part. 23. The resistance of less than 2100 ohms can measure inductance, if your ATMEGA has at least 16K flash. The range will be more than 20H from the 0:01mH, but the accuracy is not good. The measurement results show only a single element connection. 24. The test time is about two seconds, only the capacitance and inductance measurement will take a long time. 25. The software can automatically shut down t