ANSI Standards ANSI SCTE 119-2018 pdf free download – Measurement Procedure for Noise Power Ratio ANSI SCTE 119-2018 pdf free download - Measurement Procedure for Noise Power Ratio. This procedure defines a method of measurement for Noise Power Ratio (NPR) of active Cable Telecommunications equipment. It is intended for measurement of 75-ohm... 02-20 Download Now