What is meant by "omega suppression" in a lock in amplifier context?
Looking at this page, the part where they explain &quot;Signal Dynamics and Demodulation Bandwidth&quot; (search for suppress), they give an example of AM demodulation by comparing simple filtering with a locked-in filter. In the text, they say:

For the second set of requirements, frequency components corresponding to the sidebands are rejected by reducing the filter bandwidth to a value smaller than fm [...]

I don't know whether this is what &quot;omega suppression&quot; is about, but it seems to fit the description. What's more, the link you give is for the same datasheet as theirs (newer, to be expected). So my guess is the device has an option for suppressing the sidebands, as described on page 59 on their datasheet (the newer one):


Multi-harmonic  mode  (optional,  simultaneous  measurement  up  to  four  harmonicfrequencies)
Arbitrary frequency mode (optional, simultaneous measurement at 4 arbitrary frequencies


I didn't read everything, just glanced, so based on these, this is my conclusion. Maybe there are others.