Link: //pan.baidu.com/s/1h-LDFT-3Nv_a1VPLax7nlw password: kcu2 HW - 308.

1. Adopt ATmega8 ATmega168, or ATmega328 micro controller. 2.2 x16 character LCD display the results. 3. One key operation, automatically shut off the power. 4. Shut off the current 20 na, support for battery operation. 5. Low cost version without crystals, support automatically shut off the power. 1.05 k version software ATmega168 or ATmega328 when no measurements in sleep mode to reduce the power consumption. 6. Automatic detection of PNP and NPN bipolar transistor, MOSFET, Nancy (polocy) pelosi channel jfets, diode, double diode, thyristor SCR. 7. Automatically detect pin layout. 8. Measuring the current amplification coefficient of bipolar transistor threshold voltage and emission. 9. Darlington transistors can be high threshold voltage and high current amplification factor recognition. To bipolar transistor MOSFET, the protection of the diode detection. 11. Measure the MOSFET threshold voltage and gate capacitance value. 12. Two resistors and symbolic measurement showed that the top four digits and unit display. Display the resistance of the symbol is connected on both ends of tester probe number (1-3). So the potentiometer can also be measured. If the potentiometer to adjust to it, at the end of the tester is unable to distinguish between the middle and at the ends of the pin. 13. The resolution of the resistance measurement is 0.1 ohms, highest measured value 50 m ohm. 14. A capacitor can be testing and measuring. The highest shows four Numbers and units. Values can range from 25 pF (8 MHZ clock, 50 pF @ 1 MHZ clock) to 100 mf. The resolution can reach 1 pF (@ 8 MHZ clock). 15. Can for more than 2 uf numerical capacitor equivalent series resistance (ESR) capacitance measurement. A resolution of 0.01 ohms and display two digit number. This function requires at least 16 k flash ATMEGA (ATmega168 or ATmega328). 16. Two diodes can be displayed in the right direction. In addition, according to positive pressure drop. 17. For evaluation of a LED diode, pressure drop is much higher than normal. Double light emitting diode detection for the diode. 18. The zener diode can be detected, if reverse breakdown voltage is lower than 4.5 V. This will show as the two diode, can only be determined by the voltage. The probe around diode symbols are the same, in this case, you can use the 700 mv near threshold voltage recognition diode real anode! Article 19 * * * * this year to understand, not to turn over * * * * If more than three diode parts inspection, the establishment of diode number shows another failed messages. This will only happen, if the diode is connected to all three probes and at least one is diode. In this case, you should only connect two probes and start the measurement again, one by one. 20. The value of capacitance measurement of a single diode reverse. Bipolar transistor can also be measured also, if you connect the base and the collector and emitter. 21. You just need to find a single measurement of the whole bridge connection. 22. The value is lower than 25 pf capacitor is usually undetectable, but with a diode in parallel or at least 25 pf capacitor in parallel. In this case, you must subtract the shunt capacitance value. 23. The resistance less than 2100 ohms can measure inductance, if your ATMEGA has at least 16 k flash. Will range from 0:01 mH for more than 20 h, but the precision is bad. Measuring results show only a single element connection. 24. The test time is about two seconds, capacitance and inductance measurement will only need a long time. 25. The software can be set before the close of the power supply automatic measurement. 26. The built-in self-checking function and optional 50 hz signal check clock frequency accuracy and waiting for the call (ATmega168 and ATmega328). 27. Optional equipment calibration port output resistance and zero disorder self-checking capability (ATmega168 and ATmega328) need a 100 nf to 20 uf capacitance connected to pin 1 and pin 3 compensation between analog comparator offset voltage. It can reduce the measurement error of more than 40 uf capacitor. With the same internal correction capacitor voltage reference voltage was found to adjust the gain of the internal reference measurement of ADC. If the test, more than maintaining current SCR and bidirectional thyristor can be detected. But some semiconductor silicon controlled rectifier and the bidirectional thyristor is higher than the tester can provide current trigger current. Can provide the test current is only about 6 ma!Note that all function is only used to have more microcontroller program storage such as ATmega168.

Can display the battery voltage

 

 

 

 

Shutdown standby power consumption is super small, almost can be ignored

 

Boot working current is not big, can use the 9 v battery power supply, eliminating the booster with lithium electricity link,

 

Part of the testing pictures, testing components with metal foil resistors, polystyrene film capacitors, diodes, transistors, light-emitting diodes (leds) and imported silver mica capacitor and so on high precision components

Figure in the battery to test the product, when the shipment for the welding debugging good motherboard and LCD a, does not contain batteries and components to be tested,

 

If long time operation, can use a 9 v power supply.

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