During dust wipe sampling, which motion is recommended?

During dust wipe sampling, which motion is recommended?

• A. S-shaped motion
• B. Circular motion
• C. Random tapping
• D. Wiping in an S motion

Answer: (D)

Wiping in a serpentine, S-shaped pattern is recommended because it provides continuous, overlapping passes that cover the entire surface area. This motion helps ensure no dust is left uncollected in corners or along edges and promotes consistent contact and pressure across the wipe, leading to a more representative sample. Circular motions can miss areas and create uneven coverage, while random tapping can disturb dust or smear it unpredictably, compromising the sample. The S-shaped pattern, used correctly with steady pressure, keeps the wipe moving smoothly across the surface and yields more reliable, reproducible results.

Wiping in a serpentine, S-shaped pattern is recommended because it provides continuous, overlapping passes that cover the entire surface area. This motion helps ensure no dust is left uncollected in corners or along edges and promotes consistent contact and pressure across the wipe, leading to a more representative sample. Circular motions can miss areas and create uneven coverage, while random tapping can disturb dust or smear it unpredictably, compromising the sample. The S-shaped pattern, used correctly with steady pressure, keeps the wipe moving smoothly across the surface and yields more reliable, reproducible results.