Symptoms

What is a Symptom?

A symptom is a specific pattern in the vibration signal — like modulation, harmonics, or dominant frequency peaks — that acts as a fingerprint for a possible fault. MultiViz identifies and classifies these patterns automatically and associates each one with potential causes, so you can go from detection to diagnosis faster.

What symptoms give you

• Insight beyond simple threshold alerts — you see why the system flagged a source.
• Early warning signs, often before a fault becomes critical.
• A suggested fault hypothesis as the starting point of your investigation.

The 11 symptom types

MultiViz detects 11 distinct symptoms, spanning three views of the signal:

• In the waveform: Impacting, Modulation, Waveform Skewness.
• In the spectrum: Dominant 1X, Dominant 2X, Dominant Higher X, Dominant 2X Line Frequency, Haystack.
• In the envelope spectrum: Synchronous, Sub-Synchronous, and Asynchronous Envelope Harmonics.

Each points toward typical fault types — for example, Dominant 1X suggests unbalance, while Asynchronous Envelope Harmonics suggest bearing race damage.

Where to find them

In the Deep Analysis View, click the Highlights icon in the top right. Symptoms come in two states: active (colored) — currently present and worth your attention — and inactive (black and white), kept for future reference. Select a symptom to see its occurrence over time along with hand-picked example measurements.

For the full catalog with example images of all 11 symptoms, read Symptoms and Changes: How We Read Between the Lines.