Making Simple Noise Measurements
To measure signal to noise ratios
1Select the baseband receiver mode and initialize the analyzer:
Press [Instrument Mode] [receiver] [RF section
2Supply a signal from the internal source:
Connect the SOURCE output to the INPUT with a BNC cable.
Press [Source], [source on], [sine freq], 5, [MHz]
3Place the marker on the signal peak:
Press [Marker⇒ ], [marker to peak] or
Press [Shift], [Marker]
4Select video averaging: Press [Average], [average on]
5Turn on the
Press [Marker Function], [band power markers], [band pwr mkr on], [power ratio C/N].
6Press [MarkerEntry]
Rotate the knob to move the measurement band from the signal to a noise area.
The display should appear as below. The grid lines have been turned off to highlight the band power markers.
Measured noise band
The diamond shaped marker provides a reference point
Carrier to noise ratio
The value indicated in the lower left corner of the display reflects the difference between the marker level at the carrier peak and the total noise within the band markers.
