The auto port extension function allows for automatic calculation of port extension parameters by measuring a SHORT or an OPEN standard. It is also possible to measure both standards; in this case the average value will be used.
The auto port extension function can be used simultaneously for any number of ports from 1 to the number of actual instrument ports. First select the number of ports and then connect SHORT or OPEN standards to the chosen ports.
In the auto port extension menu, specify the frequency range, which will be considered when calculating the port extension parameter. There are three methods of setting the frequency range:
•Current frequency range.
•User-defined frequency range (within current range).
•User-defined frequency point (selected with a marker).
The result of the auto port extension function is the calculation of the electrical delay value. After auto port extension completes, this delay value appears in the corresponding field of the Port Extension menu, and the port extension function is automatically enabled, if it was disabled.
If the Include Loss option is enabled prior to the auto port extension function running, the loss values Loss1, Loss2 at the respective frequency values Freq1, Freq2 will be calculated and applied. The Freq1, Freq2 values are calculated as ¼ and ¾ of the frequency range set by one of the following two methods: current or user defined. If the frequency range is defined by a marker, frequency point Freq2 is not calculated.
If the Adjust Mismatch option is enabled prior to the auto port extension function running, the frequency-independent loss at DC, the Loss at DC value, is also set. The value of loss at the lower frequency of the current range is used as the Loss at DC value.
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To open the menu of the auto port extension function, use the following softkeys: Calibration > Port Extensions > Auto Port Extension |
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Then select the number of ports: Select Port(s) Select the frequency range: Method [Current Span | Active Marker | User Span] |
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Enable the include loss function Loss1, Loss2, if required: Include Loss [ON | OFF] Enable adjust mismatch function Loss at DC, if required: Adjust Mismatch [ON | OFF] |
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When using User Span method, select frequency range, using the following softkeys: User Span Start User Span Stop |
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Execute the auto port extension function after connecting SHORTs or OPENs to the ports: Measure Short or Measure Open If both measurements have been performed, the result will appear as the average value of the two. |
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