Description
►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. Measurement of gate threshold voltage and gate capacitance of MOSFET. Display using 12864 LCD LCD (128*64 characters)..►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..►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..►If the test current exceeds the maintenance current SCR and bidirectional thyristor can be detected. But the current of some semiconductor SCR and triac than the tester can provide higher trigger current. The test current available only about 6mA! Note that all the functions only for program memory more microcontroller as ATmega168..►Measure resistance optional equipment calibration output port and zero offset self checking capability (ATmega168 and ATmega328). The need for a 100nF to a 20uF capacitor connected to pin 1 and pin offset voltage compensation analog comparator 3. This can reduce the measurement error of 40uF capacitor. A correction voltage reference voltage was found in ADC internal reference measurement to adjust the gain with the same internal capacitor.
