Chapter 5
Test and Measurement Functions
CX300 Meters
22130634
CX300 ComXpert Operation Manual
Rev. 001
5.6.9.1 Audio SINAD Meter
SINAD measurements are typically used to determine receiver sensitivity, but they can
also be used to determine how a transmit signal is degraded by noise and distortion. The
SINAD meter displays the ratio Noise + Distortion divided by the sum of Noise +
Distortion, the result of which is displayed in dB.
The SINAD meter supports limits which are described in
user-configurable meter scales which are described in
, and
average measurements which are described in
. The SINAD
meter also contains the following controls and settings:
5.6.9.2 Audio Distortion Meter
The Distortion meter is used to detect and isolate any frequencies that are causing
distortion on the incoming audio signal. The Distortion meter displays the difference
between the incoming audio signal in relation to the signal generated by the CX300. The
differences detected are a result of extraneous signals present in the audio signal (i.e.,
noise, external signals).
The Distortion meter supports limits which are described in
and user-configurable meter scales which are described in
The Distortion meter also contains the following controls and settings:
Table 5-18 Audio SINAD Meter Controls and Settings
Parameter
Description
Notch BW
This field sets the notch filter bandwidth that is used when
performing noise measurements.
Notch Frequency
This field defines the frequency that is being measured when
performing noise measurements.
Table 5-19 Audio Distortion Meter Controls and Settings
Parameter
Description
Notch BW
This field sets the notch filter bandwidth used when performing
noise measurements.
Notch Frequency
This field defines the frequency that is being measured when
performing noise measurements.