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GeekTeches LCD GM328A Transistor Tester Diode ESR Meter PWM Square Wave Generator


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31,61 €


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Multi-functional transistor tester for automatic detection of NPN and PNP transistors, N channel, P channel, MOSFET and JFET, diodes, dual diode, thyristor, automatic identification of the transistor pinout. It also can be used for frequency measurement and PWM signal generator.


1. The processor uses high performance single chip ATmega328 and using external 8MHz oscillator as the system clock.
2. 1.8 Inch LCD screen, resolution is 128X160, Support 65536 colors.
3. Single button operation, support for automatic shutdown to reduce power consumption.
4. Power supply support battery, the current is less than 20nA when the system is turned off.
5. Measurement time of about 2S each time. Measuring time becomes longer when measuring capacitance or inductance.
6. Detection of NPN or PNP Bipolar Transistor automatic, N channel, P channel MOSFET and JFET, diode, Double diode, P-IGPT, Thyristor, Double thyristor etc. For some thyristor and double thyristor. Unable to test When the transistor tester can not meet the requirements of its trigger current and keep the current. Transistor testers are also unable to test the IGPT drive voltages is over than 5V.
7. Support identification pin for test element.
8. Support test current amplification factor for bipolar transistor and base emitter turn-on voltage.
9. Can judge Darlington transistor through the turn-on voltage and the current amplification factor.
10. Support test the gate threshold voltage of MOSFET, grid capacitance and drain electrode in the case of 5V gate voltage- source resistance RDSon
11. Supports the simultaneous measurement of two resistors,Data is four decimal format display. Support potentiometer test, It can not distinguish between the middle pin and this pin When the potentiometer is adjusted to one end of the potentiometer.
12. Minimum resistance resolution 0.01 ohm, Maximum resistance 50M ohms.
13. Can measure a capacitor, Capacitance range 25pf~100mF, Resolution 1pF.
14. Capacitance less than 25pF can be measured by parallel connection another known capacitor is greater than or equal to 25pF. The measured capacitance value can be obtained by subtracting the known capacitance value from the result.
15. When the test capacitance is greater than 90nF, it series equivalent resistance is also be shown, resolution is 0.01 ohm.
16. When the test capacitance is greater than 5000pF. Voltage loss after the test pulse is can be measured.This parameter can estimate the quality factor of the capacitor.
17. Support two diodes to be measured simultaneously and  display voltage drop for diode .
18. LED will be identified as a diode, the test voltage drop is much larger than that of the common diode. Two colors diodes are identified as two diodes.
19. Resistance less than 2100 ohm, it’s equivalent inductance is also measured at the same time. Range is 0.01mH~20H, but it’s measurement accuracy is not very good.
20. Program tape self checking function, support calibration of multiple parameters.
21. Support frequency measurement function,frequency signal input from PD4 pin. Frequency resolution is 1Hz when the input frequency is greater than 25KHz. When the value is less than that, by measuring the period, the frequency resolution can be 0.001Hz.
22. Support frequency generator function, output by TP2, the output frequency range is 1Hz ~ 2MHz.
23. Support a fixed frequency signal output from the TP2, the duty cycle can be adjusted by the button.


Before measuring capacitance, the capacitor must be discharged, otherwise very likely damage the meter.
Be sure to disconnect the power from the circuit board when testing the components on the circuit board, the test equipment have residual voltage is not allowed.


Type: Assembled Tester
Display: 1.8inch 160*128 LCD
Power supply: DC 7-12V  
Current: Approx. 20mA
Resistance measurement: Max. 50MΩ
Resistance resolution: 0.01Ω
Capacitance measurement: 25pF~100mF
Capacitance resolution: 1pF
Inductance measurement: 0.01mH~20H
PCB size: 7.5 x 6cm / 2.95 x 2.36in
Product weight: 50g / 1.79oz
Package size: Approx. 10 x 7 x 2cm / 3.94 x 2.75 x 0.8in
Package weight: 53g / 1.9oz

Package includes:

1 x Transistor Tester

English User Manual: Click to open


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GeekTeches LCD GM328A Transistor Tester Diode ESR Meter PWM Square Wave Generator

GeekTeches LCD GM328A Transistor Tester Diode ESR Meter PWM Square Wave Generator