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Small, gold-plated or solder-masked copper circles on the surface of the board.
Understanding the KMGD Test Point: A Critical Component in Modern Electronics kmgd test point
They often provide a reliable reference ground for sensitive measurements. Locating and Identifying KMGD Points Small, gold-plated or solder-masked copper circles on the
Use fine-tipped "needle probes" to avoid bridging two pads, which could cause a permanent short circuit. kmgd test point