Legal Chroma what does the scale represent on the Scope

I want to ensure that my colour levels are rec 709 legal, I have tried putting the Premiere Pro 5.5 Broadcast legal effect on my clips and setting the maximum setting to 100.  This does indeed restirct the upper levels but on the YC Waveform monitor when I click the option to see the chroma on the waveform the upper chroma levels are restricted to 100 but the lower levels fall below 0.3 on the scale which runs from 0-1.  Should I be at the 0.3 point to ensure that my levels are legal or is 0 the lower limit.  I believe that PAL uses anything below .3 of a Volt for sync purposes, is that represented as 0 on my scope or 0.3.
Sorry if this sounds confusing, I am certainly confused.

Thanks for your link but no one explains the chrominance scale, most of my well shot clips tend to bottom out at 0.3 which suggests that this is the normal range of values whereas some clips fall below.  All the tutorials explain Luminance which I understand (and yes i know they are related as well).  I have used the Video limiter and set it to 100% and the control that was set to -30% is set to zero, this seems to clamp the Luminance signal in the 0.3 and  1.00 limits, with what appears to be no visible artifacts or banding.  I guess I need to understand saturation a bit more to control some of the peak signals in the highlights and shaddows regions.  Loving getting into grading at this level of detail but it is a steep learning curve.

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