This item is DIY kits ,need solder it by yourself
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The use of SCM ATMEAG328P DIP-28. With IC Block
The display unit using a 160x128 pixel color display, full-screen characters 8x20, 16-bit color depth, graphic display element symbols
Rotary switch control, a key measurement, automatic shutdown
Use 9V laminated battery, can also use the power adapter(DC 6.8-12V), the whole current of about 30mA, after about 20nA shutdown current
Automatically detects NPN and PNP transistors, FET, diodes, dual diode, thyristor, SCR, automatic identification of the transistor pinout
Test NPN and PNP transistor common-emitter current amplification factor, the base - emitter threshold voltage, off the collector - emitter leakage current
Pole through the transistor base - emitter threshold voltage and high current gain recognition Darlington transistor
Detecting power transistor and FET protection diodes built
Test FET gate - source threshold voltage is turned on, the drain - source on-resistance, the gate - source capacitance
A maximum of two measuring resistors, so three feet adjustable resistor can be measured, if adjustable resistor is transferred to the end, can only be a measured resistance value
Resistance measurement maximum resolution 0.01Ω. Can be measured up to 50MΩ
Capacitor measuring range from 25pF-100mF, Resolution 1pF
Larger than 90nF capacitor while measuring its equivalent series resistance (ESR), the equivalent series resistance of the highest resolution of 0.01Ω
Larger than 5000pF capacitor also showed the rate of decline after the charging voltage of the capacitor value can reflect the quality factor (Q value)
Measuring a maximum of two diodes show its positive and negative, on-state voltage
LEDs also display a graphic symbol diode, the conduction voltage is much higher than ordinary diode
Reverse breakdown voltage is lower than 4.5V Zener diode can detect it, appears as double diode symbol. Its positive and negative voltage to turn around 700mV diode symbol prevail, a second diode symbol corresponding to the voltage is turned on regulation. So do not be an ordinary diode and a Zener diode were measured simultaneously
Test a single diode, while its test reverse junction between the PN junction capacitance between the PN junction capacitance of the transistor to be tested, then only at the same time into the transistor base and the emitter, base and collector or
Of less than 25pF capacitor to be tested, the test need to prepare a 30pF capacitor, 30pF capacitor to test, test and then measured again after the capacitor connected in parallel, by subtracting the measured value 30pF capacitors with the results obtained
For the following 2100Ω resistor while measuring its inductance measuring range from 0.01mH - 20H
About two seconds during the test, large capacitors and inductors will take longer
Additional features include a frequency measurement, voltage measurement, square wave generator, PWM
generator, color selection, commissioning calibration, continuous testing, and other functions
Frequency range from 1Hz to 1MHz or higher, measured at frequencies below 25kHz, can display period resolution to 0.001mHz
DC voltage measurement up to 50V
All the way to the square wave signal output, multi-range frequencies to choose from, the maximum output frequency of 2MHz
Output one fixed frequency, variable duty cycle pulse signal (PWM), the duty cycle is adjustable from 1% -99%
Separate capacitive function test, the test mode for the continuous measurement of 2uF-50mF capacitors can be measured directly in their circuit (circuit where the measured capacitance required power, after the measured capacitance required to be fully discharged)
Thyristors and thyristor can only recognize its pinout, and also need to test the thyristor or SCR trigger current is less than the current test instrument can provide, the tester can only provide a maximum trigger current 6mA
unction menu descriptions:
1. Switch off
Enter this Function Tester will immediately shutdown.
Transistor test, it’s also the default Function at power on.
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.
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
width at the pin TP2. With a short key press (< 0.5 s) the pulse width is increased by 1%, with a longer key press the pulse
width is increased by 10%. If 99% is overstepped, 100% is subtracted from the result. The function can be exit with a very long key press (> 1.3 s).
The additional function ”C+ESR@TP1:3” selects a stand-alone capacity measurement with ESR (Equivalent Series
Resistance) measurement at the test pins TP1 and TP3. Capacities from 2µF up to 50mF can be measured. Because the
measurement voltage is only about 300mV , in most cases the capacitor can be measured ”in circuit” without previous
disassembling. The series of measurements can be finished with a long press of RPEWS.
7. Rotary encoder
With the function ”rotary encoder” a rotary encoder can be checked. The three pins of the rotary encoder must be
connected in any order to the three probes of the transistor tester before the start of the function. After starting the
function the rotary knob must be turned not too fast. If the test is finished successfully, the connection of the encoder
switches is shown symbolic in display row 2. The tester finds out the common contact of the two switches and shows, if the
indexed position has both contacts in open state (’o’) or in closed state (’C’). A rotary encoder with open switches at the
indexed positions is shows in row 2 for two seconds as ”1-/-2-/-3 o”. This type of encoder has the same count of indexed
positions as count of pulses for every turn. Of course the pin number of the right common contact is shown in the middle
instead of ’2’. If also the closed switches state is detected at the indexed positions, the row 2 of the display is also shown
as ”1—2—3 C” for two seconds. I don’t know any rotary encoder, which have the switches always closed at any indexed
position. The interim state of the switches between the indexed positions is also shown in row 2 for a short time (< 0.5s)
without the characters ’o’ or ’C’.
With the menu function ”Selftest” a full self test with calibration is done. With that call all the test functions T1 to T7 (if
not inhibited with the NO TEST T1 T7 option) and also the calibration with external capacitor is done every time.
Voltage measurement, Because a 10:1(180K:20K) voltage divides is connected toPC3 , the maximum external voltage can be 50V, The measurement can also be exit with a extra long key press (> 4 seconds).
10. Show data
The function ,Show Data” shows besides the version number of the software the data of the calibration. These are the
zero resistance (R0) of the pin combination 1:3, 2:3 and 1:2 .In addition the resistance of the port outputs to the 5V side
(RiHi) and to the 0V side (RiLo) are shown. The zero capacity values (C0) are also shown with all pin combinations (1:3,
2:3,1:2 and 3:1, 3:2 2:1). At last the correction values for the comparator (REF C) and for the reference voltage (REF R)
are also shown. Every page is shown for 15 seconds, but you canselect the next page by a key press or a right turn of the
rotary encoder. With a left turn of the rotary encoder you can repeat the output of the last page or return to the
This function can change the color of the font, the 16bit color is encode in RGB(565) format, that mean red maximum =
31, green maximum = 63,blue maximum = 31, respectively. In the function, a short time press can index the base color to
change, turn left decrease it value and turn right increase it value. A long time press will save the Result and exit the function, please keep in mind the FrontColor and the backcolor cannot be the same. This will case the LCD show nothing.
If this happens, you need to do a Selftest , how to enter the Selftest is descriptions at Page 2. Selftest will change the back
Color to black and font color to white automatically. When the Selftest is finish . you will have the chance to modify the
This is function is the same as the FrontColor except it’s change the background color .
This function can series Measurement the capacitance at TP1 ,TP3, this function can Measurement very small capacitor. A long time press will exit the function.
14. 1- - 3
This function can series Measurement the Resistance and inductance at TP1 ,TP3, A long time press will exit the function.