R&S FSW-K7 User Manual page 384

®
R&S FSW-K7
Element
UserData
PreviewData
Example: ScalingFactor
Data stored as int16 and a desired full scale voltage of 1 V
ScalingFactor = 1 V / maximum int16 value = 1 V / 2
Scaling Factor
Minimum (negative) int16 value
Maximum (positive) int16 value
Example: PreviewData in XML
<PreviewData>
<ArrayOfChannel length="1">
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Description
Optional: contains user, application or device-specific XML data which is not part of
the iq-tar specification. This element can be used to store additional information, e.g.
the hardware configuration. User data must be valid XML content.
Optional: contains further XML elements that provide a preview of the I/Q data. The
preview data is determined by the routine that saves an iq-tar file (e.g. R&S FSW).
For the definition of this element refer to the RsIqTar.xsd schema. Note that the
preview can be only displayed by current web browsers that have JavaScript enabled
and if the XSLT stylesheet open_IqTar_xml_file_in_web_browser.xslt is
available.
<Channel>
<PowerVsTime>
<Min>
<ArrayOfFloat length="256">
<float>-134</float>
<float>-142</float>
...
<float>-140</float>
</ArrayOfFloat>
</Min>
<Max>
<ArrayOfFloat length="256">
<float>-70</float>
<float>-71</float>
...
<float>-69</float>
</ArrayOfFloat>
</Max>
</PowerVsTime>
<Spectrum>
<Min>
<ArrayOfFloat length="256">
<float>-133</float>
<float>-111</float>
...
Numerical value
15
- 2 = - 32768
2 15 -1= 32767
Reference
I/Q Data File Format (iq-tar)
15 = 3.0517578125e-5 V
Numerical value x ScalingFac-
tor
-1 V
0.999969482421875 V
384