[SI-LIST] Re: VNA Calibration for COAX Testing

Merrick,

Hopefully your VNA has adapter removal calibration available.  You can also use 
adapter swap calibration.  If so, then all you need is an adapter.

The delay method you mentioned is another option.  If you can't find 
information about these calibration methods, look here:

http://www.agilent.com/find/library

and search for "adapter removal" or "adapter swap".

--
Daniel

From: "Moeller, Merrick" <mmoeller@xxxxxxxxxxxxxxx>
> 
> Hi,
>       The VSWR seems ok. We DON'T have TDR machine, but
> the VNA has a VSWR button to convert S11. We just got a
> new calibration kit for the DIN1.0/2.3 connectors, doesn't
> include a "THRU" standard. I'm not even sure it would be=20
> available for the 3.5 to DIN1.0/2.3 on each end, respectivly.
>       In the VNA Manual the speak of fabrication of "THRU"
> standards for TRM measurements. The manual says that a 1/4
> wavelength line should be an approximate phase shift of 90
> degrees. Which would be optimal to avoid resonant points of
> 0 or 180 degrees.=20
>                       Electrical Length (cm) =3D (LINE - o length Thru)
> 
>       Electrical Length (cm) =3D (LINE x Velocity Factor)/ Delta f
> 
> This equation doesn't allow for a 20M to 2.2GHz Through standard=20
> to be more that a VERY small length.=20
>       The standards of the VNA can be adjusted by changing the
> delay in the thru standards in the cal kit menus. However, this
> seems a little extreme.=20
>       Could I use an adapter as a "THRU"? What kind of error would
> you expect to see?
> 
> -----Original Message-----
> From: Clewell, Craig [mailto:cclewell@xxxxxxxxxxxxxx]
> Sent: Wednesday, April 23, 2003 9:54 AM
> To: Moeller, Merrick
> Subject: RE: [SI-LIST] VNA Calibration for COAX Testing
> 
> 
> Hi Merrick,=20
> 
> If you get the VSWR measurement (basically and S11 measurement) you have =
> the
> TDR data.  All you have to do is transform the data.  Now that process =
> is a
> bit more entailed then I am making it sound, but what you need to do is
> perform and IFFT on the S11 data.
> 
> As far as the standard goes...I wouldn't "create" a through for the
> calibration.  I would buy a new kit.  It is very important to have the
> correct standards when performing the calibration.   There are 12 error
> terms that you correct for during the calibration process.  The more of
> these you don't account for the less accurate your measurements will be.
> You may even get non-causal data due to lack of a good calibration.   I
> would ask Dave to spring for a new cal kit.
> 
> Hope things are going well,=20
> 
> Craig
> 
> 
> -----Original Message-----
> From: Moeller, Merrick [mailto:mmoeller@xxxxxxxxxxxxxxx]
> Sent: Wednesday, April 23, 2003 9:51 AM
> To: Si-List (E-mail)
> Subject: [SI-LIST] VNA Calibration for COAX Testing
> 
> 
> Hi. I have a two port VNA and want to perfrom some VSWR and
> Attenuation measurement on a 10' cable assembly. SMA on one=20
> end and DIN 1.0/2.3 on the other. I need to perform a two port =
> calibration.
> I have an SMA Calibration kit, as well as a DIN 1.0/2.3 Kit. However, I
> don't have a "THRU" standard. What would be a reliable way to create
> such a standard???
> 
> Second, Is there a simple technique for getting characteristic impedance
> from a measurement setup of this type?
> 
> Regards,
> Merrick M. Moeller
> Design Engineer Electrical
> Cinch Connectors INC.
> 1700 Finely Rd
> Lombard IL, 60148
> Phone: 630-693-2062
> Fax: 630-7056058
> mmoeller@xxxxxxxxx


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