Тестер транзисторов GM328A

New Version GM328A Transistor Tester Diode Capacitance ESR Voltage Frequency Meter PWM Square Wave Signal Generator Soldering

Product Features:

Digital LCD display for easy reading, measurement data and graphs can be displayed

Rotary switch control, button measurement is easy to use

Press and hold the test button to exit the frequency measurement function. The frequency measurement range is from 1Hz to 1MHz or more, and when the measured frequency is lower than 25KHz, the period is displayed

Square wave generator, there are multiple levels of square wave frequency optional, left or right hand test button to switch different square wave frequencies, long press the test button to exit the square wave generator

Pulse signal generator, left-hand or right-hand test button adjusts the duty cycle of the pulse from 1% - 99%. Press and hold the test button to exit the pulse signal generator

The power supply is powered by the 5V Type-c power supply interface, and customers can also solder the 9V battery interface for power supply

Automatic shutdown, shutdown current is only about 20nA

Note: Before testing the capacitor, discharge the capacitor and then insert the test stand for measurement, otherwise it may damage the microcontroller of the tester.

Input voltage: DC5V

Working voltage: about 30mA,

Transistor tester control

The tester is controlled by a rotary encoder switch,

The rotary encoder switch can have a total of 6 operations, short press, long press, left hand, right hand, hold left hand, hold right hand.

Press once in the shutdown state to turn on the power and start the test.

After a test is complete, if no device is detected. Long press the switch or left and right rotary switch to enter the function menu, after entering the function menu, the left or right rotary switch can be selected above and below the menu item, to enter a function item, then short press the switch. When you need to exit from a function, press and hold the switch.

Calibration:

Tester calibration is used to eliminate errors in its own components, making the final test results more accurate. Calibration is divided into quick calibration and full-function calibration.

Operation method of quick calibration: Shorting the three test points TP1, TP2 and TP3 with a wire, and then pressing the test button while paying attention to the screen. The color of the screen will change to white on a black background, and the message "Selftest mode..?" will appear when the message "Selftest mode..?" After that, press the test button to enter the quick calibration process; If the message "Selftest mode..?" appears?" After 2 seconds, if there is no keystroke, a normal test process is carried out, and finally the resistance value of the wire shorted to TP1, TP2, TP3 three test points is displayed. After entering the quick calibration process, some data will appear on the screen, leave him alone. Wait until a flashing string appears on the screen

"isolate Probes!" After that, remove the wires shorted to TP1, TP2, TP3. Until the screen appears with the string "Test End", the quick calibration is complete. For the first calibration, a full-featured calibration method is used.

Full function calibration needs to be accessed from the function menu, and an additional 220nf capacitor is required. Full-featured calibration performs a more comprehensive calibration process that can take longer. After entering the function menu, rotate the test button to the menu item "Selftest", and then press the test button to enter the full-function calibration process, the flashing string "short probes!" first pops up on the screen, at this time, as with quick calibration, use the wire to short the three test points, wait for the calibration process to proceed, and the flashing string "isolate probes!" pops up on the screen! , remove the wires shorted to the three test points and continue to wait for the calibration process to proceed, and the string "1-|| pops up on the screen -3 > 100nf", mount the prepared 220nf capacitors on test points TP1 and TP3. Wait until the screen prompts "Test End" and the full-featured calibration process is complete.

Package List:

GM328A Transistor Tester X1