Case for LCR-T3 component tester

by egil, published

Case for LCR-T3 component tester by egil Mar 10, 2015
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This is a case for the LCR-T3 variant of the quite wonderful universal transistor and component tester developed by Markus Frejek, and later Karl-Heinz Kübbeler. A full description of the project is available here:


This case fits the variant with graphical display sold on Ebay and elsewhere called LCR-T3. The case includes a compartment for the battery, and gives access to the surface mount component test area. The pinout for the 14 pin ZIF test socket is printed on the case, for reference. Note that there are several different variants of this tester in the market. This case is only designed to fit the LCR-T3.

There are two versions of the case: One with a lid for the battery, and one without it. The version without a separate lid is recommended.

You need four M3x15 countersunk screws for assembling the top and bottom sections. If you choose the version with the lid, you also need a short M3 countersunk screw to secure that.

Note that the PCB for this case is the T3. The T3 is somewhat similar to the T4 PCB, but it is not the same, and does not fit the same case. There are also other variants out there. Please examine the pictures of the PCB carefully to make sure you have the right PCB before you start your print. A case for the T4 is available here: http://www.thingiverse.com/thing:797733 Yet another case is here: http://www.thingiverse.com/thing:1580922 A case for a variant with alphanumeric display is here: http://www.thingiverse.com/thing:641003


Should print without support, and with not too much cleanup. If warping is an issue, you may consider adding a brim. The top section should be printed upside-down.

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is it possible to put text on the top of the case where the numbers are?
I can't get it to work in openscad

Here, the numbers happen to be actually drawn geometrical designs, not from a font. So you can only draw 1, 2 or 3! You'd have to replace that piece of OpenScad code with something that uses an actual font. Look at OpenScad functions text() and linear_extrude(). See https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Text and https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/2D_to_3D_Extrusion

No, it's not your fault. They messed up the PCB. The ZIF socket hangs about 0,8mm over the boards edge and if you look at the solderstop mask then its obvious that they didn't care about the cuttings and board dimensions. It's just a faulty unit.

I have printed this enclosure, but it is very tight and it doesn't fit because the Chinese manufacturer of the component tester doesn't care about tolerances ;-)

The ZIF-socket, the button and the display would fit perfectly, but the PCB is about 3mm wider.

Could you please check if the PCB you have is an LCR-T4? The PCB and design is quite similar to the LCR-T3, only the routing of the wire to the battery is different, but dimensions are not the same, and in particular this PCB is 71mm wide (the T3 is 65mm wide). Here is a picture of the LCR-T4: http://i00.i.aliimg.com/wsphoto/v0/1796273364_3/Free-shipping-LCR-T4-graphical-multi-function-tester-capacitor-inductance-resistor-SCR-English-version.jpg

I now have also an LCR-T4, and if time permits, I will make a case for this one too.

Aha. 3mm sounds like it must be another PCB. There seems to be quite a few variations. Can you post a picture of it, please?

ligor73: As you point out, the version you mention will not fit this case as is. It seems to be the variant called LCR-T4. I think it should be quite feasible to alter the OpenScad so that it could be made to fit also this variant, but I cannot myself do it without having this variant in my hand so I can make the measurements and test. Sorry about that.