File Management 167
o State Saves ALL FieldFox instrument settings for ALL Modes to a *.sta file.
If a calibration is ON in CAT or NA Mode, calibration data is also saved.
This file can be opened ONLY by a FieldFox. State files can be saved between
compatible FieldFox models. See note on page 164.
o Trace + State Saves the current trace and instrument settings to a *.sta file.
In SA Mode, all traces are saved. This file can be opened ONLY by a
FieldFox. When recalled, the FieldFox sweep is set to Hold.
o Picture Saves a 640 x 453 pixel image of the FieldFox screen to a *.png file.
The picture does NOT include the softkeys.
o Data (S1P) / (2P) Saves CAT and NA Mode trace data to an *.S1P or *.S2P
file, depending on the active measurement. This file format is used by CAE
programs such as Agilent's Microwave Design System (MDS) and Advanced
Design System (ADS). It can also be imported into spreadsheet software
such as Microsoft Excel.
About SNP Files
The SNP file includes header information, and the following data:
o S1P - saves 1-port (receiver) data for the active data trace. *.s1p Files
contain 1 stimulus value and 1 S-parameter (total of 3 scalar values)
Stim Real(Sxx) Imag(Sxx)
o S2P (NA Mode ONLY) - saves data for two S-parameters (S11, S21) if they
are both displayed. *.s2p Files contain 1 stimulus value and 4 S-parameters
(total of 9 scalar values)
Stim Real(S11) Imag(S11) Real(S21) Imag(S21) Real(S12) Imag(S12) Real(S22) Imag(S22)
o When parameters are corrected, data is returned even when not displayed.
When parameters are NOT corrected or displayed, and the format is
Mag/Phase, zero-filled data appears as 0 dB and 0 degrees. When the format
is Real/Imaginary, zero-filled data appears as (1,0).
Data is returned with the correction type that is applied for each S-parameter.
The correction type for each S-parameter is annotated in the header.
Only the data trace is saved – not the memory trace.
In CAT Mode, S1P files are always Magnitude(dB) / Phase (angle) format.
In NA Mode, SNP files for traces in Smith Chart or Polar format saves
Real/Imaginary format. All other trace formats are saved in Mag/Phase format.
Trace Math is ignored when saving data to an SNP file.
o Data (csv) Saves trace data from the current Mode to a *.csv file. This
format can be imported into spreadsheet software such as Microsoft Excel.
o In SA Mode, all visible data traces are saved. Each trace is saved to a
separate column that is labeled with the Trace State.
o In CAT and NA Modes, only the data trace is saved – not the memory
trace.
o In Power Meter and VVM Mode, NO data is saved.
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