GM328 тестер транзисторов частоты ШИМ квадратная волна LCR метр вольтметр полноцветная
- Категория: Other Electronic Measuring Instruments >>>
- Поставщик: Shenzhen,TCT,Electronics,Co.,Ltd.
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Описание и отзывы
Трекер стоимости
| Месяц | Минимальная цена | Макс. стоимость |
|---|---|---|
| Aug-16-2025 | 11.50 $* | 11.45 $* |
| Jul-16-2025 | 9.61 $* | 9.82 $* |
| Jun-16-2025 | 11.2 $* | 11.4 $* |
| May-16-2025 | 11.41 $* | 11.17 $* |
| Apr-16-2025 | 9.31 $* | 9.29 $* |
| Mar-16-2025 | 11.39 $* | 11.11 $* |
| Feb-16-2025 | 11.38 $* | 11.92 $* |
| Jan-16-2025 | 11.33 $* | 11.62 $* |
Характеристики
Product Description
Specification
item | value |
Warranty | / |
Customized support | OEM |
Place of Origin | China |
Guangdong | |
Brand Name | TCT |
Model Number | GM328 |
Product name | GM328 |
Application | Transistor Tester |
Function | high quality |
Usage | frequency meter |
Keyword | ESR Transistor Tester |
Name | ESR Transistor Tester |
PAYMENT | Paypal\\TT\\Western Union\\ Trade Assurance |
MOQ | 10pcs |
Brand | TCT ELECTRONICS |
Feature | Easy Operation |
Packing & Delivery
Transistor can be be powered with 6.8V – 12V DC. This can be achieve by a 9V layer-built battery. Two 3.7V lithium-ion battery in
series or AC adapter. When powered on, the current is about 30mA at DC 9V.
Transistor Tester is controlled by a “rotary pulse encoder with switch” (RPEWS). There are 4 modes of operation - short press the
knob, long press, left and right turning of the knob. Short press will switch on the transistor and start a test. It will turn off
automatically at the end of the test. Long press and left or right turn will activate the function menu. Use > to select items.
Press and hold the knob to exit the function menu.
The transistor has 3 test points, TP1, TP2, and TP3, within the test socket. To the right of the test socket is the SMT test pad
with identifying numbers.
Attention: All ways be sure to discharge capacitors before connecting them to the tester to prevent damage. Extra caution is
required if you try to test components mounted in a circuit. In either case the equipment should be disconnected from power source
and you should be sure, that no residual voltage remains in the equipment.
Self test and calibration:
The self test can be prepared by connecting all three test point together and pushing the RPEWS. To begin the self test, the RPEWS
must be pressed again within 2 seconds. The tester with prompt you for the next step. Wait until the prompt says "isolate probes"
and then disconnect the test points. Tester will soon display "1-||-3 > 100nf”. A capacitor with any capacity between 100nF and
20µF connected to pin 1 and pin 3 is required for the last task of calibration. You should connect the capacitor, after this text
is shown. With this capacitor, the offset voltage of the analog comparator will be compensated for better measurement of capacity
values.
Tips:
Normally the tester shows the battery voltage with every start. If the voltage fall below a limit, a warning is shown. If you use
a rechargeable 9V battery, you should replace the battery as soon as possible or you should
recharge. If you try to measure little resistor values, you should keep the resistance of plug connectors and cables in mind. The
quality and condition of plug connectors are important, also the resistance of cables used for measurement. The same is inforce
for the ESR measurement of capacitors. With poor connection cable a ESR value of 0.02ohm can grow to 0.61ohm. You should not
expect very good accuracy of measurement results, especially the ESR measurement and the results of inductance measurement are not
very exact
Components with problems:
You should keep in mind by interpreting the measurement results, that the circuit of the transistor tester is designed for small
signal semiconductors. In normal measurement condition the measurement current can only reach about 6 mA. The tester often cannot
deliver enough ignition current or holding current for power thyristors or triacs. So a thyristor can be detected as NPN
transistor or diode or detected as unknown.
Another problem is the identification of semiconductors with integrated resistors. So the base emitter diode of a BU508D
transistor cannot be detected by reason of the parallel connected internal 42ohm resistor. Therefore the transistor function
cannot be tested. Problem with detection is also given with power darlington transistors. We can find often internal
base emitter resistors, which makes it difficult to identify the component with the undersized measurement current.
Measurement of PNP and NPN transistors:
For normal measurement the three pins of the transistor will be connect in any order to the measurement inputs of the transistor
tester. After pushing the RPEWS, the Tester shows in row 1 the type (NPN or PNP), a possible integrated protecting diode of the
Collector - Emitter path and the sequence of pins. The diode symbol is shown with correct polarity. Row 2 shows
the current amplification factor (hfe=...) and the Base - Emitter threshold voltage. The tester can measure the amplification
factor with two different circuits, the common Emitter and the common Collector circuit (Emitter follower). Only the higher result
is shown on the LCD. With Germanium transistors often a Collector cutoff current ICEO with current less base or a Collector
residual current ICES with base hold to the emitter level is measured
Measurement of JFET and D-MOS transistors:
Because the structure of JFET type is symmetrical, the Source and Drain of this transistor cannot be differed. Normally one of the
parameter of this transistor is the current of the transistor with the Gate at the same level as Source. This current is often
higher than the current, which can be reached with the measurement circuit of the transistor tester with the 680ohm
resistor. For this reason the 680ohm resistor is connected to the Source. Thus the Gate get with the growing of current a negative
bias voltage. The Tester reports the Source current of this circuit and additionally the bias voltage of the Gate. So various
models can differ. The D-MOS transistors (depletion type) are measured with the same method.
You should know for enhancement MOS transistors (P-E-MOS or N-E-MOS), that the measurement of the gate threshold voltage (Vth) is
more difficult with little gate capacity values. You can get a better voltage value, if you connect a capacitor with a value of
some nF parallel to the gate/source. The gate threshold voltage will be find out with a drain current of about 3.5mA for a P-E-MOS
and about 4mA for a N-E-MOS
Function menu descriptions:
1. Switch off
Enter this Function the Tester will shut down immediately.
2. Transistor
Transistor test, it’s also the default Function at switch on.
3. Frequency
Measurement of frequency, For frequencies below 25kHz the normal measurement is followed by a measurement of period time. This
additional measurement is only followed after a normal frequency measurement.
4.f-Generator
Signal generation, this Function can output square wave .with various of frequency to choice.
5. 10-bit PWM
The function ”10-bit PWM” (Pulse Width Modulation) generates a fixed frequency(7812.5Hz) with selectable pulse
Package 1 includes:
1 Fully assembled transistor tester
Package 2 includes:
1 Fully assembled transistor tester
1 DIY Acrylic case (assemble yourself)
series or AC adapter. When powered on, the current is about 30mA at DC 9V.
Transistor Tester is controlled by a “rotary pulse encoder with switch” (RPEWS). There are 4 modes of operation - short press the
knob, long press, left and right turning of the knob. Short press will switch on the transistor and start a test. It will turn off
automatically at the end of the test. Long press and left or right turn will activate the function menu. Use > to select items.
Press and hold the knob to exit the function menu.
The transistor has 3 test points, TP1, TP2, and TP3, within the test socket. To the right of the test socket is the SMT test pad
with identifying numbers.
Attention: All ways be sure to discharge capacitors before connecting them to the tester to prevent damage. Extra caution is
required if you try to test components mounted in a circuit. In either case the equipment should be disconnected from power source
and you should be sure, that no residual voltage remains in the equipment.
Self test and calibration:
The self test can be prepared by connecting all three test point together and pushing the RPEWS. To begin the self test, the RPEWS
must be pressed again within 2 seconds. The tester with prompt you for the next step. Wait until the prompt says "isolate probes"
and then disconnect the test points. Tester will soon display "1-||-3 > 100nf”. A capacitor with any capacity between 100nF and
20µF connected to pin 1 and pin 3 is required for the last task of calibration. You should connect the capacitor, after this text
is shown. With this capacitor, the offset voltage of the analog comparator will be compensated for better measurement of capacity
values.
Tips:
Normally the tester shows the battery voltage with every start. If the voltage fall below a limit, a warning is shown. If you use
a rechargeable 9V battery, you should replace the battery as soon as possible or you should
recharge. If you try to measure little resistor values, you should keep the resistance of plug connectors and cables in mind. The
quality and condition of plug connectors are important, also the resistance of cables used for measurement. The same is inforce
for the ESR measurement of capacitors. With poor connection cable a ESR value of 0.02ohm can grow to 0.61ohm. You should not
expect very good accuracy of measurement results, especially the ESR measurement and the results of inductance measurement are not
very exact
Components with problems:
You should keep in mind by interpreting the measurement results, that the circuit of the transistor tester is designed for small
signal semiconductors. In normal measurement condition the measurement current can only reach about 6 mA. The tester often cannot
deliver enough ignition current or holding current for power thyristors or triacs. So a thyristor can be detected as NPN
transistor or diode or detected as unknown.
Another problem is the identification of semiconductors with integrated resistors. So the base emitter diode of a BU508D
transistor cannot be detected by reason of the parallel connected internal 42ohm resistor. Therefore the transistor function
cannot be tested. Problem with detection is also given with power darlington transistors. We can find often internal
base emitter resistors, which makes it difficult to identify the component with the undersized measurement current.
Measurement of PNP and NPN transistors:
For normal measurement the three pins of the transistor will be connect in any order to the measurement inputs of the transistor
tester. After pushing the RPEWS, the Tester shows in row 1 the type (NPN or PNP), a possible integrated protecting diode of the
Collector - Emitter path and the sequence of pins. The diode symbol is shown with correct polarity. Row 2 shows
the current amplification factor (hfe=...) and the Base - Emitter threshold voltage. The tester can measure the amplification
factor with two different circuits, the common Emitter and the common Collector circuit (Emitter follower). Only the higher result
is shown on the LCD. With Germanium transistors often a Collector cutoff current ICEO with current less base or a Collector
residual current ICES with base hold to the emitter level is measured
Measurement of JFET and D-MOS transistors:
Because the structure of JFET type is symmetrical, the Source and Drain of this transistor cannot be differed. Normally one of the
parameter of this transistor is the current of the transistor with the Gate at the same level as Source. This current is often
higher than the current, which can be reached with the measurement circuit of the transistor tester with the 680ohm
resistor. For this reason the 680ohm resistor is connected to the Source. Thus the Gate get with the growing of current a negative
bias voltage. The Tester reports the Source current of this circuit and additionally the bias voltage of the Gate. So various
models can differ. The D-MOS transistors (depletion type) are measured with the same method.
You should know for enhancement MOS transistors (P-E-MOS or N-E-MOS), that the measurement of the gate threshold voltage (Vth) is
more difficult with little gate capacity values. You can get a better voltage value, if you connect a capacitor with a value of
some nF parallel to the gate/source. The gate threshold voltage will be find out with a drain current of about 3.5mA for a P-E-MOS
and about 4mA for a N-E-MOS
Function menu descriptions:
1. Switch off
Enter this Function the Tester will shut down immediately.
2. Transistor
Transistor test, it’s also the default Function at switch on.
3. Frequency
Measurement of frequency, For frequencies below 25kHz the normal measurement is followed by a measurement of period time. This
additional measurement is only followed after a normal frequency measurement.
4.f-Generator
Signal generation, this Function can output square wave .with various of frequency to choice.
5. 10-bit PWM
The function ”10-bit PWM” (Pulse Width Modulation) generates a fixed frequency(7812.5Hz) with selectable pulse
Package 1 includes:
1 Fully assembled transistor tester
Package 2 includes:
1 Fully assembled transistor tester
1 DIY Acrylic case (assemble yourself)
Company Profile
Shenzhen TCT Electronics Co., Ltd., is a professional wholesale electronics such as 3D printers Parts, electronic components, Wi-Fi wireless modules, etc. specialized in electronic components related to Ardus,Raspberry Pi,Robots , IoT and Smart home control device. Our products are widely used in IT, telecommunication, multimedia, home appliance, automobile, robot, as well as electric industry and so on We give our customers and partners the promise as follows: 1. Trust at beginning.2.Competitive price with high quality products. 3.Faster delivery time.4.Patient and flexible services.5. Strong R&D dept.,
FAQ
1. who are we?
We are based in Guangdong, China, start from 2021,sell to North America(30.00%),South America(20.00%),Southern Europe(10.00%),Northern Europe(10.00%),Central America(10.00%),Africa(10.00%),Eastern Europe(10.00%). There are total about 11-50 people in our office.
2. how can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;
3.what can you buy from us?
Electronic module sensor,Development board / downloader,Power management / instrument module,Motor / trolley / wheel,Signal generator / converter 3D printer series
4. why should you buy from us not from other suppliers?
Shenzhen TCT Electronics Co., Ltd., is a professional wholesale electronics such as 3D printers Parts, electronic components, Wi-Fi wireless modules, etc. specialized in electronic components related to Ardus,Raspberry Pi,Robots , IoT and Smart home con
5. what services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,DDP,DDU,Express Delivery；
Accepted Payment Currency:USD,EUR,JPY,CAD,AUD,HKD,CNY;
Accepted Payment Type: T/T,L/C,D/P D/A,MoneyGram,Credit Card,Western Union,Cash;
Language Spoken:English,Chinese,Spanish,Japanese,Portuguese,German,Arabic,Russian,Italian
We are based in Guangdong, China, start from 2021,sell to North America(30.00%),South America(20.00%),Southern Europe(10.00%),Northern Europe(10.00%),Central America(10.00%),Africa(10.00%),Eastern Europe(10.00%). There are total about 11-50 people in our office.
2. how can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;
3.what can you buy from us?
Electronic module sensor,Development board / downloader,Power management / instrument module,Motor / trolley / wheel,Signal generator / converter 3D printer series
4. why should you buy from us not from other suppliers?
Shenzhen TCT Electronics Co., Ltd., is a professional wholesale electronics such as 3D printers Parts, electronic components, Wi-Fi wireless modules, etc. specialized in electronic components related to Ardus,Raspberry Pi,Robots , IoT and Smart home con
5. what services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,DDP,DDU,Express Delivery；
Accepted Payment Currency:USD,EUR,JPY,CAD,AUD,HKD,CNY;
Accepted Payment Type: T/T,L/C,D/P D/A,MoneyGram,Credit Card,Western Union,Cash;
Language Spoken:English,Chinese,Spanish,Japanese,Portuguese,German,Arabic,Russian,Italian
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