PCB testing fixture
Description
###A "3rd-hand" style PCB and testprobes holder for testing, debugging electronics. ###This setup has shown quite useful to steadily hold oscilloscope and extra probes to PCBs during development, freeing both hands for more interesting tasks than just holding a probe. Some details of the construction: * The metal articulated-arm was taken from a cheap dial-gauge. The base was unscrewed and the M5 bolt is attached to the aluminum profile using an M5 T-nut. This arm is quite nice to use, since allows you to hold the scope probe in different angles and keep it steady, even when the ground-spring is attached to the tip for low-noise or high-speed measurements... * The aluminum profile is a 20x20mm from openbuilds, cut to approx. 20cm. * For holding the PCB, one side is held in place with an M3 bolt, while the other is free to move across the rail, spring-loaded by a ~50mm long spring which fits inside the profile and is held by another T-nut. * The 3D printed 2nd arm uses also M3 bolts to hold the base and the arm, while the hexagonal knobs make easy the adjustment by hand. * At the end of the arm, there is a 20mm long 1.35mm diameter spring-loaded "pogo-pin", which is soldered at the top side to a flexible silicone wire. The sharp tip and the spring of the pogo-pin makes easy to hold enough pressure of this arm into a PCB testpoint or on top of an SMD pad. The design can be extended of course if more probes are needed, by adding 1 more profile in L-shape (this somehow keeps the PCB size flexibility). 2 or 3 more profiles will allow adding more arms/probes, but will somehow limit the flexibility of using different board sizes.
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