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Why is it important to consider probe tip size and shape when placing test points on a PCB?

hard🧠 Conceptual Q10 of 15
PCB Design - Design Review and Testing
Why is it important to consider probe tip size and shape when placing test points on a PCB?
ABecause probe size affects the PCB's thermal resistance
BBecause probe size affects minimum spacing to avoid shorts and ensure reliable contact
CBecause probe shape changes the electrical properties of the PCB
DBecause probe size determines the color of the test point
Step-by-Step Solution
Solution:
  1. Step 1: Understand probe physical constraints

    Probe tips have physical size and shape that require minimum spacing between test points.
  2. Step 2: Evaluate impact on PCB design

    Proper spacing avoids shorts and ensures good electrical contact; color or thermal effects are unrelated.
  3. Final Answer:

    Because probe size affects minimum spacing to avoid shorts and ensure reliable contact -> Option B
  4. Quick Check:

    Probe size importance = Spacing and contact reliability [OK]
Quick Trick: Match test point spacing to probe tip dimensions [OK]
Common Mistakes:
MISTAKES
  • Linking probe size to color or thermal effects
  • Ignoring physical probe constraints
  • Assuming probe shape changes PCB electrical properties

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