Rohde & Schwarz FSV3000, User Manual

Page: 234 / 1489

Measurements and results
R&S
®
FSVA3000/ R&S
®
FSV3000
234 User Manual 1178.8520.02 ─ 08
5.6.4.3 Fast SEM measurements
To improve the performance of the R&S FSV/A for spectrum emission mask measure-
ments, a "Fast SEM" mode is available. If this mode is activated, several consecutive
ranges with identical sweep settings are combined to one sweep internally, which
makes the measurement considerably faster. The displayed results remain unchanged
and still consist of several ranges. Thus, measurement settings that apply only to the
results, such as limits, can nevertheless be defined individually for each range.
Prerequisites
"Fast SEM" mode is available if the following criteria apply:
●
The frequency ranges are consecutive, without frequency gaps
●
The following sweep settings are identical (for details see Chapter 5.6.5.1, " Sweep
List " , on page 240):
– "Filter Type"
– "RBW"
– "VBW"
– "Sweep Time Mode"
– "Reference Level"
– "RF Attenuation Mode"
– "RF Attenuation"
– "Preamplifier"
Activating Fast SEM mode
"Fast SEM" mode is activated in the sweep list (see Chapter 5.6.5.1, " Sweep List " ,
on page 240) or using a remote command. Activating the mode for one range automat-
ically activates it for all ranges in the sweep list.
Remote command :
[SENSe:]ESPectrum<sb>:HSPeed
on page 931
Fast SEM not supported for multiple sub blocks
For SEM with multiple sub blocks, fast SEM is not available. If more than one sub
block is defined and a standard is loaded which contains an active fast SEM setting,
this setting is disabled.
For more information on multi-SEM measurements, see
Chapter 5.6.4.5, "SEM with
multiple sub blocks ("Multi-SEM")" , on page 236.
Consequences
When the "Fast SEM" mode is activated, the ranges for which these criteria apply are
displayed as one single range. The sweep time is defined as the sum of the individual
sweep times, initially, but can be changed.
Spectrum emission mask (SEM) measurement