To Measure Signal To Noise Ratios - Agilent Technologies 89410A Getting Started Manual

Making Simple Noise Measurements

To measure signal to noise ratios

1
Initialize the analyzer:
Press [
2
Supply a signal from the internal source:
Connect the SOURCE output to the CHANNEL 1 input with a BNC cable.
Press [
3
Place the marker on the signal peak:
Press [
or
Press [
4
Select video averaging:
Press [
5
Turn on the carrier-to-noise marker:
Press [
6
Press [
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.
Step 3 above illustrates that there are two ways to perform certain actions—by
using the hardkey/softkey sequence or by using the short-cut shift/hardkey
sequence.
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.
2-4
].
Preset
], [ ], [
Source source on sine freq
], [
Marker⇒ marker to peak
], [ ]
Shift Marker
], [ ].
Average average on
], [
Marker Function band power markers
]
Marker|Entry
], 5, [ ]
MHz
]
], [
band pwr mkr on
], [ ].
power ratio C/N