It is a LCR-T4 transistor tester.It uses an ATmega328 microcontroller.
The liquid crystal is a 12864 liquid crystal display with a backlight, and the backlight color is generally yellow-green.Powered by 9v stacked batteries.
If you supply power for a long time, you can use an 8.4v battery pack with 2 lithium batteries to supply power.
1.Comes with acrylic case
2.LCD12864 large screen display
3.Support boot voltage detection function
4.Automatic detection of NPN and PNP transistors,N-channel and P-channel MOSFETs,diodes (including dual diodes),thyristors,transistors,resistors and capacitors.
5.The pin of the component is automatically tested and displayed on the LCD.
6.Higher test speed,valid component test is 2 seconds.(Except for larger capacitors,the measurement of large capacitors also takes a long time,and the measurement time of 1 minute is normal)
7.Automatic shutdown function can avoid unnecessary waste,save battery energy and improve battery life.
8.One-button operation automatically turns off the power.
9.The ATmega328 uses sleep mode to reduce power consumption when not in measurement.
1.Product Name:LCR-T4 Transistor Tester
2.Supply Voltage: DC9V
3.Resistance Measurement Resolution:0.1 ohm
4.Maximum Measurement Value:50M ohm
10.Inductance: 0.01mH - 20H
11.Standby current: 0.02uA
12.Operating current: 25mA
1.The shutdown current is only 20nA,which supports battery operation.
2.Measure the current amplification factor of the bipolar transistor and the threshold voltage of the emitter junction.
3.Darlington transistors can be identified by high threshold voltages and high current amplification factors.
4.It supports two resistance measurement and symbol display,up to four digits and unit display.The resistance symbol shown is at both ends of the connected tester probe number (1-3).So the potentiometer can also measure.If the potentiometer is adjusted to one end,the tester cannot distinguish between the middle and two ends of the pins.
5.It can measure the equivalent series resistance (ESR) capacitance value of capacitors with a value above 2UF.
6.It can show the sign of the correct direction for the two diodes and the forward voltage drop.
7.The LED is detected as a diode and the forward voltage drop is much higher than normal.The dual light emitting diode is detected as a dual diode.
8.Zener diodes can be detected if the reverse breakdown voltage is below 4.5V.This will appear as two diodes and can only be determined by voltage.The sign of the probe around the diode is the same,in which case you can identify the true anode of the diode by a threshold voltage near 700mV.
9.If more than 3 diode-type parts are detected,the number of established diodes displays another failure message.If a diode is connected to all three probes and at least one is a type diode.In this case,you should just connect the two probes and start the measurement again,one after the other.
10.Measure the reverse capacitance of a single diode.If you connect the base to the collector or emitter,bipolar transistors can also measure.
11.Capacitors with values below 25pf are usually not detected,but can be connected in parallel with a diode or at least 25pf capacitors.In this case,you must subtract the part of the shunt capacitance.
12.The test time is about two seconds,and only capacitance and inductance measurements take longer.
13.The software can set the number of measurements before the power is automatically turned off.
14.If the test current exceeds the sustain current,thyristors and triacs can be detected.But some semiconductor thyristors and triacs have higher trigger currents than the tester can provide.The available test current is only about 6mA.
5.Rotary Encoder Switch Control Button:
1.The rotary encoder switch can have 4 kinds of operations in total,short press,long press,left-hand and right-hand.
2.Short press once in the shutdown state to turn on the power and start the test.
3.After a test is completed,if no device is detected,you can long press the switch or the left and right rotary switches to enter the function menu.After entering the function menu,the left or right rotary switch can be selected up and down the menu item.To enter a certain function item,then Press the switch shortly.
1>.On the right side of the test stand is the test position of the chip component.There are numbers 1,2,and 3 respectively,each representing TP1,TP2,TP3.
2>.When testing a component with only 2 pins,the pins are in no particular order of testing.The 2 pins select 2 test points arbitrarily,and the 3 pin device pins are placed in three test points,regardless of order.
3>.After the test,the tester automatically recognizes the pin names and test points of the components and displays them on the screen.
4>.When testing components with only two pins,if two test points TP1 and TP3 are used,the test will automatically enter the continuous test mode after the test is completed,so that the components on TP1 and TP3 can be continuously and synchronously measured without pressing the switch.If you are using the "TP1 and TP2" or "TP2 and TP3" test,only test once.If you want to test again,press the switch once.
1>.The tester calibration is used to eliminate the errors of its own components and make the final test results more accurate.Calibration is divided into quick calibration and full-function calibration.
2>.Operation method of quick calibration:
1.1>.Short-circuit the three test points TP1,TP2,and TP3 with wires,and then press the test button while paying attention to the screen.The screen color will change to white text on a black background.After the prompt message "Selftest mode ..?" Appears,press the test button once to enter the quick calibration process.
1.2>.If after the prompt message "Selftest mode ..?" Appears,there is no key press within 2 seconds,a normal test process is performed,and finally the resistance value of the short test leads TP1,TP2,and TP3 is displayed.
1.3>.After entering the quick calibration process,some data will appear on the screen,regardless of him.Wait until the flashing character string "isolate Probes!" Appears on the screen,then remove the wires shorting TP1,TP2,TP3.Until the string "Test End" appears on the screen,the quick calibration is completed.
3>.Function calibration method:
1.1>.For the first calibration,the full-function calibration method is used.Full-function calibration needs to be entered from the function menu,and a 220nf capacitor is required.Full-featured calibration performs a more comprehensive calibration process and will take longer.
1.2>.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!" Will appear on the screen first.At this time,it is the same as the quick calibration.Short-circuit the three test points with a wire and wait for the calibration process to take place.When the flashing string "isolate Probes!" Appears on the screen,remove the wire shorted at the three test points and continue to wait for the calibration process to proceed.When the character string "1-||-3> 100nf" is output,install the prepared 220nf capacitor on the test points TP1 and TP3.
1.3>.Wait until the screen prompts "Test End" and the full-function calibration process is complete.
2>.Transistor:Transistor test,which is the default function after power on.
3>.Frequency:measuring frequency.Long press the test button to exit the frequency measurement function.The frequency measurement range is from 1Hz to 1MHz or more.When the measured frequency is lower than 25KHz,the period is displayed.
4>.f-Generator:square wave generator,there are multiple square wave frequency options,left or right test button to switch between different square wave frequencies,long press the test button to exit the square wave generator.
5>.10-bit PWM:pulse signal generator,left or right test button to adjust the pulse duty cycle,from 1% -99%.Long press the test button to exit the pulse signal generator.
6>.C+ESR@TP1:3:Capacitance online measurement function,two wires can be led from TP1 and TP3 to measure the capacitance value and ESR of 2uF-50mF capacitor online.Note that the measured capacitor needs to be fully discharged before the test.If it is online measurement The circuit where the capacitor is located must be completely powered off before proceeding.
7>.1-||-3:Continuous capacitance measurement method,constantly testing the capacitance values installed on TP1 and TP3.For small-capacity capacitors,the capacitance value can only be measured by this test method.For capacitors greater than 90nF,the equivalent series resistance (ESR) is measured and the resolution of ESR is 0.01ohm.Capacitors above 5000pF show the rate of voltage drop after charging.
8>.SelfTest:full-featured calibration function
9>.Voltage:DC voltage measurement,up to 50V.The voltage to be measured must be input from the "voltage measurement" interface (do not input the voltage to be measured from other interfaces such as the "frequency output" interface,it will damage the microcontroller).To exit this function,quickly rotate the encoder left and right.
10>.FrontColor:Set the foreground color,that is,the color of the character.The left or right test button can change the corresponding color component value.Short press the test button to select the red,green,and blue primary colors to be changed.The 16-bit color coding uses RGB 565) format,corresponding to red up to 31,green up to 63,and blue up to 31.After setting,long press the test button to save and exit.Be careful not to set the foreground color and background color to the same color,so that nothing will be visible,if this happens,shut down,and then perform a quick calibration,enter the quick calibration method as described above,the screen color will become black and white.Modify the screen color immediately after the quick calibration is completed.
11>.BackColor:It is the same as the method of setting the foreground color,but this is to modify the background color.
12>.Show date:Display the internal data of the tester,from which you can observe the test function of the tester.
13>.IR_Decoder:Infrared remote control decoding function.This function requires the use of a 1838 integrated infrared receiver (pulse type).After entering this function,observe the prompt on the display.The second line will display the string "1=DOUT,2=GND,3=VCC",the meaning of the character string means the connection relationship between the 3 test points on the tester and the infrared receiving head,and the connection must be carried out in strict accordance with the instructions.The test socket can only be left empty or properly fitted with an infrared receiver head,and no other components can be put in,nor can it be used to short-circuit the test points with wires.To avoid unpredictable failures.
14>.IR_Encoder:Infrared remote control encoding function,which requires an infrared light-emitting diode.The tester can control the infrared light-emitting diode to realize the function of an infrared remote control.Since the tester can only provide a drive current of about 6 mA at most,the control distance cannot be compared with a normal infrared remote control.In the case of aligning the infrared receiver head,it is probably within 2 meters.Infrared remote control encoding supports two formats,which are the same as the infrared remote control decoding format introduced earlier.Also use uPD6121 to represent format one,and TC9012 to represent format two.
1>.The infrared remote control coding function can only be accessed from the function menu.Before entering the infrared remote control coding function,there should be no components on the test stand and the square wave output terminal.After entering the infrared remote control coding function,connect an infrared light emitting diode to the square wave output terminal,the negative electrode of the infrared light emitting diode is grounded,and the positive electrode is connected to the output.The positive and negative poles of the infrared light-emitting diode can be extended with wires to facilitate operation.Infrared LEDs have positive long legs and short negative legs.
2>.The leftmost column of the display is a ">" symbol,indicating the parameter currently being set.Short press the test button to switch ">" between each setting item.The second line "protocol" sets the encoding format to be used.Rotate the test button left and right to switch between "uPD6121" and "TC9012".The third and fourth lines "user code1" and "user code2" set the first and second bytes of the user code.The left-hand test button can be decreased by 1 and the right-hand test button can be increased by 1.
3>.The fifth line sets the data code (data).The left-hand test button decreases by 1 and the right-hand test button increases by 1.The data inverse code is calculated automatically by the data code and cannot be set manually.
4>.When setting the user code and data code values,in addition to rotating the test button left and right to change its value in units of 1,it can also be increased in units of 0x10.The method of operation is to long press the test button,but the time of long press cannot be over If it is too long,it will exit from this function.
5>.The sixth line is the emission control "emit:".When you move the ">" symbol to this line,you can rotate the test button left and right to emit infrared light according to the data set above.When turning the test switch,you can see a "->" symbol flashing quickly.Indicates that data was transmitted once.
1>.To use an infrared coding function to control an appliance,you must first know the encoding format of the remote control that controls the appliance.So the first step is to use the infrared decoding function to read the code value of a button on the remote control.
2>.For example,the TV is a Samsung LCD TV.Press the volume down button on the remote control,and the decoded value is:
Record the above data,and then in the infrared coding function,set separately
Then move the ">" symbol to emit:
3>.The infrared light-emitting diode connected to the square wave output terminal of the transistor tester is aligned with the position of the infrared receiver of the TV set,and the test button is turned to start a transmission,and the TV can be controlled to reduce the volume.
4>.To exit from this function,first remove the infrared LED connected to the tester,then long press the test button to exit.
5>.Note:The transistor tester only supports TC9012 and uPD6121 two encoding formats.The values are expressed in hexadecimal.
1pcs LCR-T4 Transistor Tester