Test Probes:
My standard test probes for electronic work are made from old plastic pen cases. I solder on a sewing needle to the test wire and then glue it into the old pen.
I can measure PCB voltage through the insulation. I can measure PCB current by probing along a track with two probes using a good DVM.
I have even measured current in individual IC leads when looking for problems.
I also use skinny test wires since I am not going to measure high current.
The only time I use off-the shelf probes is for AC line problems digging into a fuse panel.
Bertho
From: electronics101@groups.io <electronics101@groups.io> On Behalf Of Andy via groups.io
On Fri, Oct 10, 2025 at 10:32 AM, sdmonaco wrote:
These probes will allow you to test the LEDs with your dvm while still in the packaging.
Point of interest - Those probes are "wire piercing", which presumably helps when the devices have insulated leads or are soldered to circuits that have insulated wires. These do not. They are leadless. The connection points are already exposed, but tiny.
That kind of ultra-thin probe might also be good for probing individual LEDs when they are still in their carrier, but I am no expert on that. 'sdmonaco' suggests that it does.
Probing 0402 parts must be challenging. Steady hands and good eyesight are essential.
Andy
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