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36 The PCB Magazine • April 2015 FeAture SPLITTING HAIRS: THE MANUFACTURE OF HDI AND SUBSTRATE TEST FIxTURES continues Figure 3: Probe installation. wires this is a manual process. Each probe is in- stalled one at a time (Figure 3). There is no auto- mated option for this step due to the finite and delicate nature of the probes/wires being used. A steady hand and in many cases magnification is required during this critical step. Final Assembly In this step the mechanical pieces are brought together. All the machined parts are brought together with the delicate probe/wire module. This is a critical step as all tolerances must be within nominal parameters or the final Figure 2: Drill process.