# What is meant by "omega suppression" in a lock in amplifier context?

Can anyone explain what is meant by "Omega suppression" in lock-in amplifier discussions or specifications. I'm usually very good at web-searching, but have been unable to find anything that explains rather than mentions this term. I find it mentioned in some manuals but never explained.

Omega and 2 Omega sound like fundamental and 2nd harmonic, but ...?

Some mentions:

In passing only here Setting up a Digitally Tunable Resonator using the HF2LI

Many mentions here MFLI User Manual but meaning uncertain from context.

• Have you asked Zurich Instruments? May 3 at 14:30

Looking at this page, the part where they explain "Signal Dynamics and Demodulation Bandwidth" (search for suppress), they give an example of AM demodulation by comparing simple filtering with a locked-in filter. In the text, they say: