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The tabs in the Project Settings window are covered in the following pages
Spectral Scan Tab
Enter
Start Frequency
and
Stop Frequency
to identify the span of the Spectral Scan to be
implemented.
RBW (Resolution Bandwidth):
It is set by
default at 120 kHz and can be reduced to the
lowest level allowed by the spectrum analyzer.
Decreasing the bandwidth will improve the
amplitude accuracy and increase the sensitivity;
the scan will however take more time to
complete. The bandwidth you choose should not
be disproportionate to the span. The suggested
ratio of Span/RBW should be <10,000 e.g. 10
kHz bandwidth with a 100 MHz span, 100 kHz
bandwidth with a 1 GHz span so that the scan
can finish in a reasonable time.
Reference Level:
The maximum signal intensity that the spectrum analyzer can acquire at a
given frequency without clipping, this setting does not need to be changed except when
measuring very strong signals.
Measure Peaks:
It activates the peak marking feature whereby peaks are rescanned at a
tighter bandwidth in order to accurately measure the frequency as long as the peak’s value
is 5 dB above the average noise floor of the scan. By default, the maximum number of peaks
is set to 10. The maximum number peaks that can be measured is 30.
Peak Hold:
Also known as Max-Hold this is a very important feature as it allows you to run a
Spectral Scan continually replacing the peak amplitude with each successive higher
measurement. This is an excellent way to find the frequency of an intermittent or random
signal.
Spectral Averaging:
In the Run Continuously mode, the Spectral Scan is constantly
updated with the average between the new measurement and the average of the previous
measurements. It is a very important feature to help you identify the more persistent noise
that could affect pre-compliance.
Replace Data When Running Continuously:
If you Scan Continuously when this option is
checked, EMScanner software replaces the previous scan data and keeps the last scan
data. In order to keep all scan data, uncheck this option.
Spectrum Analyzer in DC Coupled Mode:
When this option is checked, the analyzer goes
from the protected AC mode to the unprotected DC mode. This enables a much lower noise
floor in the low frequency range, usually below 10 MHz, depending on the spectrum
analyzer. DC voltage applied to the spectrum analyzer input can however cause damage to
the internal circuitry. The DC Coupled Mode is currently available for the Keysight EXA
below 10 MHz and PSA below 20 MHz. New drivers must be developed on demand for any
other spectrum analyzer. Contact Y.I.C. Technologies (
support@yictechnologies.com
)