Introduction to Calibration

Calibration is of critical importance for making accurate measurements from your VNWA.

Without calibration the VNWA will indicate random values.

While Calibrating, a Short circuit SMA connector, a Open circuit SMA connector and finally a 50R SMA load are connected to the VNWA TX Port in turn.

During Calibration we step the TX port frequency (S11) over the Frequency band of interest. This way the VNWA builds up calibration table for each frequency for the following measurement points:

  • Low end of the measurement scale (short = 0 Ohm)
  • High end of measurement scale (open – infinity)
  • Mid scale point on the measurement scale of 50R Resistive load  - normalizing value of S-parameter measurements.

Next, connecting the TX port to the the RX port via a Thru Cable and performing a Thru Calibration sets the transmission loss between these two ports to 0dB and allows accurate insertion loss measurements.

Video Tutorial by Kurt Poulson OZ7OU:  First time VNWA Calibration (duration 16 mins)

Note: SDR-Kits is taking all reasonable steps when measuring and recording the actual value of the Load Resistor. Calibration Kits should only be used however for "Indication Purposes not for final testing"

SDR-Kits supplies calibration kits made up of the following components from two Manufacturers

Amphenol Connex

3 pcs Male SOL Calibration Kit Amphenol Parts or 4 pcs Plug (Male) Calibration Kit 

This is a low cost Calibration Kit but good results are obtainable up to 1 GHz...1.3 GHz. 

The value of the Amphenol SMA load supplied is always exactly 50 Ohm and therefore set as the default value in the Calibration Kit - Simple SOLT Model settings Tab.

The Amphenol kits are supplied with a data sheet courtesy of Kurt Poulsen OZ7OU

Data Sheet - SDR-Kits Amphenol Connex Cal Standards for the DG8SAQ VNWA

Note: 4pcs Calibration Kit only available as part of VNWA 3 / 3EC Presentation Case

Rosenberger GmbH

This is a premium product which is specified up to 12.4 GHz.

Female SMA SOL 4 pcs Calibration Kit of Rosenberger 12 Ghz Parts in wooden box by SDR-Kits

   

    -1 pc 50 Ohm 1 Watt Jack (female) load part no 32K15R-001E3 

        The actual  value of the Rosenberger load supplied is measured and recorded by SDR-Kits on label     inside the calibration box

          -1 pc 0 0hm Short Jack (female) part no 32Z114-000L5

            -1 pc SMA Jack - Jack (Female-Female) Open connector & Adapter part no 32K101-K00L5

            -1 pc SMA Plug - Plug (Male-Male Open) connector & Adapter part no  32S103-S00L5



        Male SMA SOL 4 pcs Calibration Kit of Rosenberger - Fairview 12 Ghz Parts in wooden box by SDR-Kits

           

            -1 pc  50 Ohm 0.5 Watt Plug (Male) load partno 32S15R-0.5E3

            The actual  value of the Rosenberger load supplied is measured and recorded by SDR-Kits on label     inside the calibration box

              -1 pc 0 0hm Short Plug (Male) part no 32Z111-000L5

               - 1 pc SMA Plug - Plug (Male-Male Open) connector & Adapter part no  32S103-S00L5

                -1 pc SMA Plug (Male) Open Connector - Dustcap Fairview Microwave part no SC2028

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              The value of the 50R Load is laser trimmed by Rosenberger GmbH during  manufacture to the specified S11 return loss over the extended frequency range. Therefore the value of the Load resistor is no longer 50 Ohms. The actual value of the Rosenberger Load is measured by SDR-Kits and the value is supplied to the Customer with the Calibration kit. When using Rosenberger Calibration parts VNWA users must therefore enter this value in the Calibration Kit - Simple SOLT Model settings Tab.

              The Rosenberger kits are supplied with a datasheet courtesy of Kurt Poulsen OZ7OU

              Data Sheet - SDR Kits Rosenberger Female Calibration Parts

              Data Sheet - SDR Kits Rosenberger Fairview Microwave Male Calibration Parts

              Download Information on how the new improved Calibration Standards were measured by Kurt Poulsen OZ7OU

              Calibration Kits