Tektronix RSA5100A Series Printable Help page 154

RF Measurements
Parameters Tab - SEM
The Parameters tab specifies several characteristics that control how the Spectrum Emission Mask
measurements are made.
Setting
Meas Freq
Step
Auto
Real-Time
Measurement Type
Total Power
PSD
Peak
Offset definition
Ref center to OS center
Ref center to OS edge
Ref Edge to OS center
Ref Edge to OS edge
Filter Shape
Gaussian
Rectangular
xxx
140
Description
Specify the frequency of the signal to be measured.
Sets the increment size when changing the Frequency using the knob or mouse wheel.
When Auto is enabled, the step size is adjusted automatically based on the span setting.
When Real-Time mode is enabled, the entire SEM span is measured using a
real-time/contiguous acquisition. Not all described parameters are available in Real-Time
mode.
Specifies the type of measurement for the reference channel; used as a reference for
the offsets.
Sets the reference to the integrated power of the reference channel within the reference's
integration bandwidth.
Sets the reference to the mean of the power spectral density (dBm/Hz) of the reference
channel. The trace and the absolute and relative limits line are also in dBm/Hz
Sets the reference to the Peak power of the reference channel.
Defines the relative position of the start/stop frequency of an offset. Choose the offset
definition based on the standard.
Specifies that the start/stop frequencies are defined from the center frequency of the
reference channel to the center of the filter BW.
Specifies that the start/stop frequencies are defined from the center frequency of the
reference channel to the center of the (inner) edge of the filter BW of the offset.
Specifies that the start/stop frequencies are defined from the edge of the reference
channel to the center of the filter BW of the offset.
Specifies that the start/stop frequencies are defined from the edge of the reference
channel to the (inner) edge of the filter BW of the offset.
Specifies the shape of the filter determined by the window that is applied to the data
record, in the spectrum analysis, to reduce spectral leakage. 3GPP specifies a Gaussian
window shape be applied to the reference channel measurements.
This filter shape provides optimal localization in the frequency domain.
This filter shape provides the best frequency, worst magnitude resolution. This is
essentially the same as no window.
Parameters Tab - SEM
RSA5100A Series Printable Help