To compensate for loss at DC, enter a positive value which causes the trace to shift in the positive (up) direction. Loss at DC Offsets the entire frequency span by this value. The following settings allow the entire frequency span to be corrected for loss. The Step Size setting will not change automatically. Enter a positive value.ĭistance Units (Dialog ONLY) Select from Meters, Inches, or Feet. Enter a positive value.ĭistance The amount of port extension delay in physical length. Time The amount of port extension delay in time. DelayĮnter delay in either Distance or Time by entering a value or clicking the up/down arrows. This is the only way to show or hide the toolbar. The toolbar allows you to make adjustments to the port extensions while showing more of the screen. Show Toolbar Check to show the Port Extensions toolbar. Port Extension Turns ON and OFF port extensions on all ports. Port Extensions settings affect ALL measurements on the active channel that are associated with a particular port. Port Select a port for delay and loss values.
#RIGOL DSA815 SHOWS NEGATIVE VSWR HOW TO#
Learn Why and How to use Port Extensions (scroll up). Port extensions settings affect all measurements on the active channel that are associated with a particular port. Therefore, adjusting delay with this method results in a delay equal to two times the delay of the OPEN or SHORT. Note: Most OPEN and SHORT standards have delay. If you know the loss of the additional transmission line, enter the Loss Compensation values using either one or two data points.
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On the Port Extension toolbar or dialog, increase either Time or Distance until the phase response is flat across the frequency span of interest. In most cases, removing the DUT will leave a suitable OPEN at the new reference plane. With an OPEN or SHORT at the calibration reference plane, verify that the phase across the frequency span is at or near zero.Ĭonnect the fixture or added transmission line and attach an OPEN or SHORT in place of the DUT. Port Extensions can then be added manually (as follows), or by using Automatic Port Extensions. If you do NOT know either the electrical or physical length of the fixture or additional transmission line, you must be able to connect an OPEN or SHORT to the new reference plane - in place of the DUT. If you know the physical length of the fixture or additional transmission line, enter the value directly to the Distance setting. If you know the electrical length of the fixture or additional transmission line, enter the value directly to the Time setting. When Port Extension compensation is applied in the Apply Error Terms process, after a Data-to-Memory operation has been performed, further changes to Port Extensions settings will NOT be applied to the Memory trace.
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Therefore, when using Port Extensions with features that require more than a single S-parameter (such as k-factor in equation editor), do one of the following:Įnable Fixturing - Individual Fixturing features are NOT required to be enabled. This allows all underlying S-parameters to have proper extensions applied. However, when Fixturing is ON or when making a Balanced Measurement, Port Extension compensation is applied in the Apply Error Terms process which affects ALL S-parameters, whether displayed or not. Normally, Port Extensions are applied to individual S-parameters in the Phase Correction process and only applies to displayed S-parameters.
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Important Note: Port Extensions and PNA Data Flow Use port extensions to "tell" the analyzer you have added the length to a specific port. You have already performed a calibration, and then decide that you need to add a length of transmission line in the measurement configuration. Perform a calibration at a convenient place, then use port extensions to compensate for the time delay (phase shift), and optionally the loss, caused by the fixture. You are unable to perform a calibration directly at your device because it is in a test fixture. Other Calibration Topics Why use Port Extensions Note: This feature is available to GCA, GCX, Spectrum Analyzer, and standard (S-Parameter) channels. Port extensions allow you to electrically move the measurement reference plane after you have performed a calibration.