The LCT-T4 measures components, including resistors, potentiometers, inductors, capacitors, diodes, dual
diodes, transistors (including MOS), SCR's, regulators, LED's, and ESR.
For testing operation plug the component that you want to test into pins 1, 2 or 3 on either side of the DIL socket,
then press the test button.
Specifications:
Resistor: ≤2100Ω
Resolution of Resistance Measurement: 0.1 Ohm
The Highest Measured Value: 50M ohms Provided Testing Current: Approx. 6mA
Capacitor: 25pF-100000uF
Inductance: 0.01mH - 20H
Working power: DC-9V (9 Volt block battery or 2 li-ion batteries to form 8.4V)
Standby current: 0.02uA
Shutdown Current: 20nA
Operating current: 25mA
Product Size: 7.2 x 6.25cm (L * W)
Description:
• Automatic detection of NPN and PNP transistors, N -channel and P-channel MOSFET, diodes
(including dual diode), thyristors, transistors, resistors and capacitors and other components
• Measuring bipolar transistor current amplification factor and base-emitter threshold voltage.
• Automatic test out the pin element and displayed on the LCD
• Can be detected to determine the transistor emitter forward bias voltage of the transistor, MOSFET
protection diode and the amplification factor of the base
• Reverse breakdown voltage is less than 4.5V, Zener diode can be identified.
• Measure the gate threshold voltage and gate capacitance of the MOSFET
• 2uF more capacitors can simultaneously measure the equivalent series resistance ESR values.
• Via the base - emitter threshold voltage and high current amplification factor to identify
Darlington transistors.
• Can simultaneously measure two resistors and resistor symbol is displayed. Displayed on the
right with a decimal value of 4.
• High test speed about 2 seconds (larger capacitor measurement can take up to 1 minute)
LCR-T4 Component Tester
I recently picked up an LCR-T4 Component Tester from E-Bay. I've had my eye on these for a while and for AUD12 (including the acrylic case), I thought it was worth giving one a try. There are LOTS of different versions out there.
Well it measures components, including resistors (and potentiometers), inductors, capacitors, diodes, dual diodes , transistors (including MOS), SCR's, regulators, LED's, and even ESR.
The claimed accuracy is:
Resistance: 0.1 ohm resolution, maximum 50M ohm
Capacitor: 25pf -100,000 uf
Inductors: 0.01mh-20H
These are probably a touch optimistic but for picking out components, the accuracy is adequate
This unit apparently comes with the 2013 M328 version of the software and includes a 128*64 backlit LCD display, which uses about 2mA in stand by. As you can see in the image above, the unit will automatically identify and tell you which pin is the BCE for a transistor, not to mention the gain and forward voltage - nice! One of the features is automated detection of pin assignment, which means the device can be connected to the tester in any order. You can only use pins 1,2,3 of the DIL socket.
The open source firmware and hardware design is based on the work of a couple of . If you were brave you could flash the firmware to the latest version.
Peel the paper from the acrylic (both sides).
Mount the PCB on the base plate using the four smaller bolts and the spacers (see photos below). You may want to pass the battery cable under the PCB, but it isn't compulsory.
Insert the side panels into the base, starting with the top one as it has the tightest fit against the screen ribbon cable.
Snap the top plate in place, it will only fit one way. This should hold things in place while inserting the 4 long bolts and nuts which hold everything together. Done!
The first trick is to make sure that you use a fresh 9V battery, if you don't then the display will be unreadable.
Operation is pretty straight forward. Just plug the component that you want to test into pins 1, 2 or 3 on either side of the DIL socket, then press the blue test button. The unit turns itself off after displaying the results for 10 seconds. If you have surface mount components, you can use the pads on the PCB labelled 1, 2 and 3 instead of the DIL socket.
The unit will automatically detect NPN & PNP transistors, N- and P-channel MOSFETs, JFETs, diodes, small thyristors, and TRIACs. It will measure hFE and base-emitter-voltage for bipolar junction transistors (e.g. Darlingtons).
Up to two resistors can be measured with a resolution down to 0.1 ohm. The measurement range is up to 50 Mohm (Megaohm). Resistors below 10 ohms will be measured with the ESR and a resolution of 0.01 ohm. Note that resolution is not equivalent to accuracy.
Capacitors in the range 35pF (picofarad) to 100mF (millifarad) can be measured with a resolution down to 1 pF. Inductances of 0.01 mH to 20 H can be detected and measured.
The short video below shows an LED being tested.
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