In partnership with
The moment it matters
09:12 — A motor/pump train hums like always. The overall RMS looks “fine,” but a narrow tooth of energy rises at 1× running speed and brings a friend at 2×. You have two choices: call it noise and walk, or read the three tells that separate unbalance, misalignment, and looseness before they snowball into hot bearings and weekend callouts.
Principle: Read overall, 1×, 2× first—at a known recipe—and decide with numbers, not vibes.