Multifunction Tester Graphic Transistor Ohmmeter NPN Capacitor Inductor ESR

Description

Multifunction Tester Graphic Transistor Ohmmeter NPN Capacitor Inductor ESR
Features:
Use ATmega8, ATmega168 or ATmega328 microcontrollers.
2x16 character LCD display results.
One-button operation, automatically turn off the power.
The shutdown current is only 20nA, support battery operation.
Low-cost version does not use crystal, support automatic power off. The 1.05k version of the software ATmega168 or ATmega328 uses sleep mode to reduce power consumption when not measuring.
Automatic detection of PNP and NPN bipolar transistors, N, P-channel MOSFET, JFET, diode, dual diode, thyristor.
Automatic detection of pin layout.
Measure the current amplification factor of the bipolar transistor and the threshold voltage of the emitter junction.
Darlington transistors can be identified by high threshold voltages and high current amplification factors.
Detection of protection diodes for bipolar transistors and MOSFETs.
Measure the threshold voltage and gate capacitance of the MOSFET.
Support measurement and symbol display of two resistors, up to four digits and unit display. Both ends of the displayed resistance symbol are the connected tester probe numbers (1-3). So the potentiometer can also be measured. If the potentiometer is adjusted to one end of it, the tester cannot distinguish between the middle and the ends of the pin.
The resolution of the resistance measurement is 0.1 ohm, and the highest measured value is 50M ohm.
A capacitor can be detected and measured. The highest four digits and units are displayed. The value can be from 25pf (8MHz clock, 50pF@1MHz clock) to 100mF. Resolution up to 1 pF (@ 8MHz clock).
The equivalent series resistance (ESR) capacitance value of a capacitor above 2UF can be measured. The resolution is 0.01 ohms and the display is a two-digit value. This feature requires at least 16K flash ATMEGA (ATmega168 or ATmega328).
The sign of the correct direction can be displayed for both diodes. In addition, a forward voltage drop is displayed.
LED detection is a diode, the forward voltage drop is much higher than normal. The dual LEDs are detected as dual diodes.
Zener diodes can be detected if the reverse breakdown voltage is below 4.5V. This will be shown as two diodes, which 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 around 700mV!
If more than 3 diode-type parts are detected, the number of diodes established shows an additional failure message. This only happens if the diode is connected to all three probes and at least one is a diode. In this case, you should only connect the two probes and start the measurement again, one after the other.
Measure the capacitance of a single diode in reverse. Bipolar transistors can also be measured if you connect the base to the collector or emitter.
Only one measurement is needed to find the connection of the full bridge.
Capacitors below 25 pf are usually not detected, but can be connected in parallel with a diode or at least 25 pf. In this case, you must subtract the portion of the shunt capacitance value.
If the resistance is less than 2100 ohms,the measurer will measure the inductance, if your ATMEGA has at least 16K flash memory. The range will be over 20H from 0:01mH, but the accuracy is not good. The measurement results show only a single component connection.
The test time is about two seconds, and only the capacitance and inductance measurements take a long time.
The software can set the number of measurements before the power is automatically turned off.
Built-in self-test function with optional 50Hz signal check for clock frequency accuracy and waiting for calls (ATmega168 and ATmega328).
Optional device calibration port output internal resistance and zero offset self-test capability measurement (ATmega168 and ATmega328). A 100nF to 20uF capacitor is required to connect between pin 1 and pin 3 to compensate for the offset voltage of the analog comparator. This can reduce the measurement error of capacitors above 40uF. Correcting the voltage reference voltage internally with the same capacitor was found to adjust the gain of the internal reference measurement ADC.
If the test current exceeds the holding current, the thyristor and the triac can be detected. However, some semiconductor thyristors and triacs have higher trigger currents than the currents that the tester can provide. The test current is only about 6mA! Note that all functions are only available for microcontrollers with more program memory such as ATmega168.
Specification:
Printed Circuit Board Size:63*71mm/2.48*2.8in
Weight:44g/1.55oz
Screen:12864 LCD, backlight color is generally yellow-green.
Battery:9v laminated battery. For long periods of time, an 8.4v battery pack can be made up of two lithium-ion batteries
(Not Included)
Function:
Added boot voltage detection function.
Automatic detection of NPN and PNP transistors, N-channel and P-channel MOSFETs, diodes (including dual diodes), thyristors,  resistors and capacitors, etc.
Automatically test the components of the pins and display them on the LCD.
Can determine the amplification factor and base of transistors, MOSFET protection diodes, etc. to determine the forward bias voltage of the emitter transistor.
MOSFET measuring gate threshold voltage and gate capacitance.
The monitor uses 12864 LCD (128 * 64 characters).
Higher test speed, expiration component test: in 2 seconds (except in larger capacitors, the measurement of large capacitance still takes a long time, the measurement time is 1 minute is normal).
One-button operation, boot test, one button to get.
Power consumption off mode: less than 20 nA
Automatic shutdown function can avoid unnecessary waste, save battery energy and improve battery life.
Package List:
1* Transistor Tester
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