R&S FSQ Signal Analyzer - Rohde & Schwarz

R&S FSQ Getting Started
6. Switching on the Fast ACP routine.
➢ Press the CP/ACP CONFIG � softkey
➢ Set the FAST ACP softkey to ON.
Measurements on Modulated Signals
➢ Press the ADJUST REF LEVEL softkey.
The R&S FSQ makes consecutive measurements on the 5 channels in the
zero span mode using the receive filter specified in IS 136 to define the
resolution bandwidth. The power in each channel is displayed on the graph as
a function of time.
Fig. 2.28 Measuring adjacent channel power in time domain (Fast ACP)
As the resolution bandwidth is much wider than the one used for the integration
method, the results are much more stable when compared at the same sweep
time.
Repeatability can be influenced by the selected sweep time. The results
become much more stable if long sweep times are selected. Since the
amplitude distribution is different in different channels (part of the modulation
spectrum falls within the first adjacent channel), the repeatability depends on
the spacing of the measured channel from the transmit channel.
Operating Manual 1313.9681.12 - 01 2.41