Just did some more measurements on the scope direct from the low and high outputs of my sig gen, (Tech TE-20D) and obtained the following:
At 130Mhz Low is 7mv and high is 1.8V probes on 1x
At 120Khz Low is 40mv and high is 3.2V probes on 1x.
I think that maybe my Tech has gone tech as the spec for it states that the Low has a maximum of 100uv and high of 100,000uv but it does not state the frequencies these were measured at?