Testing and identify all the transistor: bipolar (NPN and PNP)， field-effect tube， mosfets (n-channel and p-channel enhancement pattern and depletion mode MOSFET)， thyristor， inductance， SCR and bidirectional pin. And voltage test and identification of pin diode， double diode， varactor diodes， zener diode (test voltage up to 5 v) and LED.
Power supply requirements: 8 to 12 v
Testing and identify all the transistor: bipolar (NPN and PNP)， field-effect tube， mosfets (n-channel and p-channel enhancement pattern and depletion mode MOSFET)， thyristor， inductance resistance， SCR and bidirectional pin.
And voltage test and identification of pin diode， double diode， varactor diodes， zener diode (test voltage up to 5 v) and LED.
Power supply requirements: 8 to 12 v
Fourth， interface specifications and related operations
P4 interface (power supply)
VDD: positive (7 ~ 12 v)
GND: power supply cathode
SW1: the power switch
P5 interface
DS18B20
P3 interface (frequency) measurement
Fx: input (1 v to 10 v) coupling dc voltage
GND， the power to
Four， buttons
FREQ: frequency measurement or test temperature (long press button to enter measurement).
TRANS: transistor test.
Delivery (excluding DS18B20)
Note: the screen is backlit， standard LCD1602 interface.
