76.605(a)(9)(i)
Fact
(9) The ratio of visual signal level to the rms amplitude of any coherent disturbances such as intermodulation products, second and third order distortions or discrete-frequency interfering signals not operating on proper offset assignments shall be as follows:
(i) The ratio of visual signal level to coherent disturbances shall not be less than 51 decibels for noncoherent channel cable television systems, when measured with modulated carriers and time averaged; and
(ii) The ratio of visual signal level to coherent disturbances which are frequency-coincident with the visual carrier shall not be less than 47 decibels for coherent channel cable systems, when measured with modulated carriers and time averaged.
Myths
Miconceptions go here
More Facts and a link to the truth.76.601(c)(1).
possibly more myths
more facts ( if needed )
perhaps another myth
and more facts
76.601(c)with links
Measurements
There are several types of meters on the market today to make these types of
measurements. 76.609(a)provides some suggestions on how to perform
other tests and 76.601(a)(1)provides test point and data collection information.