Measurement
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The third line is a header line indicating the contents of each item of trace
data written on the fourth line onward.
The fourth line onward shows the trace data. The amount of data is
determined by the number of points (frequency) assigned to the trace.
Saving Trace Data
Follow the procedure below to save trace data from the E4990A.
1. Press Channel Next (or Channel Prev) and Trace Next (or Trace prev)
to select the trace to be saved.
2. Press Save/Recall > Save Trace Data to open the Save As dialog box.
3. Select the destination folder and input a file name.
4. Click Save to save the file.
This function is inactive when the security level is set
at low/high.
Saving Data in Touchstone Format
You can also save trace data of a E4990A active channel of S-parameter to
a Touchstone format file.
Touchstone file data format
You can use data in a touchstone-format file for equivalent circuit analysis
and so on using a circuit simulator such as Advanced Design System
(ADS). For more information on ADS, refer to the ADS's users manual.
File Structure
In the case of the E4990A, the data array is saved as S parameters of the
1-port model in a touchstone-format file. You can read out the contents of
a file with your text editor because they are text data.
You can save data in "log magnitude - angle", "linear magnitude - angle",
or "real number - imaginary number."
When AUTO is selected, the data format is automatically set according to
the display format of the active trace. However, when the display format of
the active trace is set to one other than the log magnitude format
(LogMag), linear magnitude format (LinMag), or real-imaginary number
format (Real/Imag), the data format is automatically set to real-imaginary
number.
You can use data saved in Touchstone format for a circuit simulator such
as Agilent Advanced Design System (ADS) on your PC (personal computer)
or workstation. For more information on the ADS, refer to the operation
manual that comes with the system.
Data structure in Touchstone file
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