Stork instead of Crocodile. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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Probes for measuring instruments, equipped with crocodile clips, are bulky and inconvenient when working with microcircuits. I offer my design, shown in the figure.
These probes are simple and ergonomic to use and have served me well for 20 years. Some complexity of their manufacture was later justified by the reliability and duration of operation. Each probe consists of two sewing needles No. 4, suitably modified. The improvement is as follows. Needles in pairs, according to the desired number of probes, are ground on a "non-piercing" abrasive wheel to half their diameter.
To securely hold the probes on the measured leads on the planes of the workpieces, it is necessary to make 3-4 notches. Since steel needles are difficult to machine, recesses with clear, even edges were obtained by electroerosion.
To the positive terminal of a capacitor charged to 15 V with a capacity of 4700 microfarads, a wire with a diameter of 0,5 mm was connected to a carbide roller from a glass cutter that had been used for its intended purpose, and a blank was connected to the negative terminal.
Carefully bring the sharp edge of the roller closer to the desired location on the plane of the workpiece. Discharge - and the notch, 0,3 mm deep, is ready. If necessary, the discharge can be repeated.
The capacitor is recharged from the rectifier (power is not critical) through a 24 V switch lamp and a current of 35 mA. It is impossible to connect directly, since overheating is possible at the point of sparking, the release of the needles and, as a result, the loss of their elasticity.
Since steel is an unimportant conductor, in order to reduce the transient resistance of the workpiece, it is necessary to copper-plat it by immersing them first for 10 minutes in a hot solution of washing powder, and then for 1 hour in a solution of spent ferric chloride. To speed up the copper plating process, the solution can be heated to 50 ... 60 degrees.
Next, the blanks are folded in pairs, first breaking off one by 10 mm. They wrap the workpieces together with the output conductor with a thin tinned wire, heat it with a soldering iron, and quickly pull a tube of vinyl or colored rubber onto the hot probe.
These probes do not damage the "delicate" pins of micro-details, because they do not hold them in a "death grip", like a "crocodile". They can jump off with a tension force of 10 to 100 gauss, depending on the thickness of the leads and the depth of their capture.
The wire from the probe to the device should be light and flexible, in colored insulation. A tinsel wire, it would seem, is the most suitable, but due to noise and unstable conductivity, it is unacceptable.
In order not to short-circuit adjacent leads during measurements, a thin layer of durable varnish or molten nylon is applied to the outer surface of the probes.
It is also convenient to dig through the insulation with these probes when searching for the right wire in a bundle or in a complex installation.
Author: A. Ladyka, St. Petersburg
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