PXI-5660 / 5620. What is lowest reasonable voltage when using Analog Edge Trig?

Presently, I am using Analog Edge Ref Triggering on the PXI-5660.  The lowest voltage that I can set the trigger level to is 0.200 volts without noise causing the trigger to occur.  Is this level reasonable?  Is there a way to reduce the noise so that the trigger level can be set lower?
I graphed the waveform coming out of the niScope MultiRead Cluster.vi in the ni5660 Read Average Power Spectrum.vi.  The noise on the graph was as high as 0.190 volts.  I thought that I saw the noise down to 0.010 volts at one time.
Thanks.

Thank you for your response.
The reference level I am using is 0 dBm.
I ran the ‘niScope SMT Power in Band.vi’ example with dithering enabled and disabled.  I could see the noise when dithering was enabled and the reduced noise or no noise when dithering was disabled.  See attached .jpg’s.  I added ‘Waveform Graph 2’ to display the output of ‘niScope Multi Read Cluster.vi’.
In my application, I disabled dithering and put the trigger level lower.  It now works.
Disabling dithering needs to be set after ‘ni5660 Configure for spectrum.vi’.  Inside the ‘ni5660 Configure for Spectrum.vi’, a vi called ‘SMT Configure RFSA for Spectrum.vi’ enables dithering.  ‘SMT Config niScope for Spectrum.vi’ is another vi that enables dithering.
Thank you for your help.
Attachments:
SMT Power in Band with 50 ohm termination on input of 5620 Dither Disable.jpg ‏100 KB
SMT Power in Band with 50 ohm termination on input of 5620 Dither Enable.jpg ‏106 KB

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