R&S FSL Noise Measurements
1300.2519.12 2.21 E-11
Fig. 2-15 Measurement of the R&S FSL's intrinsic noise power in a 1.23 MHz channel
bandwidth.
5. Stabilizing the measurement result by increasing the sweep time
Press the H key twice.
The main menu for channel and adjacent channel power measurement is displayed.
Press the Sweep Time softkey and enter 1 s.
The trace becomes much smoother because of the RMS detector and the channel power
measurement display is much more stable.
Method of calculating the channel power
When measuring the channel power, the R&S FSL integrates the linear power which corresponds to the
levels of the pixels within the selected channel. The spectrum analyzer uses a resolution bandwidth
which is far smaller than the channel bandwidth. When sweeping over the channel, the channel filter is
formed by the passband characteristics of the resolution bandwidth (see Fig. 2-16).
Channel bandwith
Resolution filter
-3 dB
Sweep
Fig. 2-16 Approximating the channel filter by sweeping with a small resolution bandwidth
To Next Page
Loading...
