1The use of single chip microcomputer ATMEAG328P DIP-28 with IC block. 2The display unit uses a 160x128 pixel color display, full-screen characters 8x20, 16-bit color depth, graphic display elements symbols. 3Rotating coding switch control, one-button measurement, automatic shutdown. 4Powered by 9V laminated battery (not included), can also use the power adapter, the whole current of about 30mA, about 20nA current after shutdown. 5Automatic detection of NPN and PNP transistors, FET, diodes, dual diode, thyristor, silicon controlled rectifier, automatic identification of the above transistor pin out. 6Test NPN and PNP triode common emitter current amplification factor, base-emitter threshold voltage, collector-emitter leakage current at turn-off. 7Identification for Darlington transistors through triode base-emitter threshold voltage and high current amplification factor. 8Detect power triode and FET built-in protection diodes. 9Test FET gate-source turn-on threshold voltage, drain-source on-resistance, gate-source capacitance. 10It can measure up to 2 resistors at a time, so the adjustable resistors of the three feet can also be measured. If the adjustable resistor is adjusted to the end point, only one resistance value can be measured. 11The resistance is measured at a maximum resolution of 0.01. Can measure up to 50M. 12Capacitor measurement range from 25pF to 100mF with 1pF resolution. 13For capacitors larger than 90nF, the equivalent series resistance (ESR) is measured at the same time. The resolution of the equivalent series resistance is up to 0.01. 14For capacitors larger than 5000pF, the voltage drop rate after charging is also displayed. This value can reflect the quality factor (Q value) of the capacitor. 15Measure up to two diodes at a time, showing their positive and negative, on-voltage. 16The LED is also shown as a graphical symbol of the diode, which has a much higher turn-on voltage than a normal diode. 17A voltage stabilizing diode with a reverse breakdown voltage lower than 4.5V can also be detected and displayed as a double diode symbol. The positive and negative poles have a diode symbol with a turn-on voltage of about 700mV, and the turn-on voltage corresponding to the other diode symbol is a regulated value. So don't measure a normal diode and a voltage stabilizing diode simultaneously. 18When testing a single diode, the reverse junction capacitance of the PN junction is tested at the same time. The PN junction capacitance of the transistor can also be tested. At this time, only the base and emitter of the transistor, or the base and collector can be placed at the same time. 19Capacitors below 25pF can also be tested. This test requires first preparing a 30pF capacitor, first testing the 30pF capacitor, then measuring the capacitor to be tested in parallel with it, and subtracting the measured value of the 30pF capacitor from the result. 20The inductance is measured simultaneously for resistors up to 2100, measuring from 0.01mH to 20H. 21The test process takes about 2 seconds, and large capacitors and inductors take longer. 22Additional features include frequency measurement, voltage measurement, square wave generator, PWM generator, infrared remote control decoding, infrared remote control code, DS18B20 temperature sensor test, DHT11 temperature and humidity sensor test, color selection, debug calibration, continuous test, etc. 23The frequency measurement range is from 1Hz to 1 MHz or higher.