Carrier To Noise Ratio (Cnr) - Promax AE-166 User Manual

Press Reference[F2] to set the reference to the upper or lower base
frequencies.
The
reference.
Press Limit[F3] and set the limit for the upper and lower 3
intermodulation product amplitude.
Press Pass/Fail Test[F4] to toggle pass/fail testing on/off.
The
above.
4.1.13

Carrier to Noise Ratio (CNR)

Description
►
Carrier to noise ratio calculates the difference in amplitude between the
carrier signal and the noise level present in the transmission. CNR
measurements are used for both analog and digital CATV.
Parameters
►

Noise Parking: Sets the position of the delta marker (Δ1) using two
options:

MIN: The delta marker will search for the minimum between the carrier
frequency and the carrier frequency + 4 MHz.

ΔMarker: User defined delta marker position.
Measurement items
►

Visual Carrier: frequency, amplitude

CNR: amplitude difference

Δf: frequency difference between visual carrier and noise marker.
Example
►
121
icon will be displayed next to the selected upper or lower
pass or fail icon will be displayed depending on the limit set
Figure 84.
rd order
February 2017