Rohde & Schwarz ESW Series, User Manual

Page: 120 / 759

Measurements and Result Displays
R&S
®
ESW
120 User Manual 1177.6298.02 ─ 08
The R&S ESW supports a selected set of resolution bandwidths. If you enter a number
that is not supported, the R&S ESW rounds the value up to next available bandwidth.
More information
Remote command:
Bargraph:
[SENSe:]BANDwidth[:RESolution][:VALue]
on page 511
Scan table:
[SENSe:]SCAN<sr>:BANDwidth:RESolution
on page 456
CISPR APD:
[SENSe:]BANDwidth[:RESolution][:VALue]
on page 511
Measurement Time ← Configuring scan ranges
Defines the measurement time used to analyze the signal.
You can define a different measurement time for the bargraph, each scan range
defined in the scan table and the final measurement. If you perform a scan that is not
based on a scan table (
Current parameters), the measurement time for the scan is the
same as for the bargraph.
In addition, you can define a separate measurement time for fixed frequency scans.
Tip: Make sure to select a measurement time that is appropriate for the analyzed sig-
nal and that allows the various filters and detectors in the signal path to settle.
Note that the measurement time for IF analysis is calculated automatically based on
the measurement time of the bargraph.
Remote command:
Bargraph:
[SENSe:]SWEep:TIME
on page 452
Scan table:
[SENSe:]SCAN<sr>:TIME
on page 461
Final measurement:
[SENSe:]FMEasurement:TIME
on page 473
Fixed frequency scan:
[SENSe:]SCAN<sr>:TDOMain
on page 453
CISPR APD:
[SENSe:]SWEep:TIME
on page 452
Auto Range ← Configuring scan ranges
Turns automatic configuration of the attenuation and gain on and off.
When you turn on auto ranging ("State"), the R&S ESW automatically selects an
attenuation (and gain, if auto mode for the preamplifier is on) that allows for an ideal
analysis of the received signal (without overloading the RF input).
Depending on your measurement task, select one of the following auto range modes
("Mode").
●
Normal
The "Normal" mode selects an attenuation and gain that results in a good signal-to-
noise ratio.
Thus, it reduces the display of spurious products. It also leads to an increased dis-
play of the inherent noise (because of a higher attenuation).
●
Low noise
The "Low Noise" mode selects an attenuation and gain that increases the sensitiv-
ity of the R&S
ESW.
This mode gives a better impression of spurious products and is thus useful to ana-
lyze signals whose level is near the noise level. However, the signal-to-noise ratio
in general can deteriorate.
Both auto range modes are designed to maintain the best dynamic range possible.
Test Automation