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S2P file header in dB issue

Question asked by raymondkin on Feb 24, 2010
Latest reply on Feb 25, 2010 by raymondkin
I have a remark regarding the header in S2P file we save from the PNA/PNA-X. From All the literature I found on the internet, the header line should state DB if the file is save in dB format. However, the files that Agilent PNA and PNA-X produces a header with lowercase "d".

The literature I found are on :
http://cp.literature.agilent.com/litweb ... k04a8.html
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For .s2p files:

#
[HZ/KHZ/MHZ/GHZ]
[S/Y/Z/G/H]
[MA/DB/RI]
[R n]
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http://www.eda.org/ibis/connector/touchstone_spec11.pdf
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Legal values are:
DB for dB-angle (dB = 20*log10|magnitude|)
MA for magnitude-angle,
RI for real-imaginary.

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view topic
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RI = Real / Imaginary
DB = Log Mag / Phase
MA = Lin Mag / Phase

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Here is the header produced with a Agilent E8361A PNA :

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!Agilent Technologies,E8361A,US43140691,A.04.87.01
!Agilent E8361A: A.04.87.01
!Date: Friday, November 06, 2009 11:33:36
!Correction: S11(Full 2 Port SOLT,1,2) S21(Full 2 Port SOLT,1,2) S12(Full 2 Port SOLT,1,2) S22(Full 2 Port SOLT,1,2)
!S2P File: Measurements: S11, S21, S12, S22:
# Hz S  dB   R 50

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We fixed our software to be compatible with PNA's generated S2P files, but I hope the next PNA firmware should follow Touchtone file format specifications.

Thanks,
Raymond Kin
Focus Microwaves Inc.
http://www.focus-microwaves.com/

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