Lcr-t4 is a combination electronic a device that can measure the capacitance of capacitors, resistance of resistors, inductors of coils. Lcr-t4 can determine the parameters of transistors, diodes. And he will show you the type of transistor, its characteristics, the designation of the transistor pins on the graphic LCD.
The heart of the Lcr-t4 is the ATmega328 microcontroller. I later found out that Lcr-t4 is actually homemade comrade Karl-Heinz Kubbeler, which he made on the basis of the homemade work of another comrade Markus Frejek, whom he called "AVR-Transistortester". They developed this miracle of electronic technology, placed a scheme, software, description in the public domain on the Internet. Now this device is called "Tester ERE with AVR microcontroller and a minimum of additional elements." Radio amateurs all over the world make it on other microcontrollers, change the design, use different types of displays and, of course, change the software. Lcr-t4 - this is one of the possible options "Tester ERE with AVR microcontroller and a minimum of additional elements." Therefore, we can use the technical instructions for the “Tester ERE with AVR microcontroller and a minimum of additional elements”, translated in 2015 for software version No. 1.12k by Sergey Bazykin.
View online file:
You can also read the documentation for “AVR-Transistortester” on the Internet links:
The site published the results of testing a tester based on the ATmega328 and ATmega 1284 microcontrollers:
Lcr-t4 - manufactured in the factory, has good characteristics for the accuracy of measuring the resistance of resistors, capacitance of capacitors, inductance of coils. This is verified by me in practice. Lcr-t4 is a very necessary, inexpensive measuring device, which a radio amateur should have in his laboratory.
Specifications that the seller claims:
Measuring resistance range of resistors: minimum 0.1 ohm 50 megohms;
Capacitor capacitance measurement range: minimum 25 pF, maximum 100,000 uF;
Induction range: minimum 0.01 mN, maximum 20 N.
I want to tell you that with Lcr-t4 you can change the firmware to a new one with new features. I saw how this was done, but I did not repeat it myself. To do this, the connector is soldered to the board (see photo below) and the firmware of the device is changed using the programmer for AVR microcontrollers.
Using a 9-volt krone battery as a power source is not entirely economical. I use a 12 volt power supply and a DC / DC converter that lowers the voltage to 9 volts. It works fine for me.
Enjoy the shopping!
Cost: ~ 405