Cable correction function allows to take into account the influence of cable characteristics during transform in the time domain. The function contains the cable velocity factor and the cable loss in dB/m. The cable loss value is indicated at the specified frequency. All values can be set manually or selected from the table of predefined cables. The velocity factor is used to convert the time units to the distance units. The cable loss value, together with the frequency, are used to compensate for the attenuation in the cable, so that, for example, the response to an open circuit is unity. The cable correction function is disabled by default.
Cable Correction Activation
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To enable/disable cable correction function of the time domain transformation function, use the following softkeys: Analysis > Time Domain > Cable Correction > Cable Correction [ON | OFF] |
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Cable List
The program contains the predefined cable list (See figure below). Each row of the list contains the cable name and the following parameters: velocity factor, cable loss and frequency.
Cable List
All list fields can be edited. Changes are saved automatically.
If there is no cable description in the table, it is possible to add it. To do this, create a new row in the table using the Add New Cable button and enter its name and parameters.
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To open the cable list, use the following softkeys: Analysis > Time Domain > Cable Correction > Select Cable |
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To select the cable in list, use the Select softkey. Note: Make sure that the name of the selected cable appears in the text field of the Select Cable softkey. |
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To add the new cable in the list, use the Add New Cable softkey. The new cable will be added to the line following the highlighted one.
New Cable in Cable List (Example) To delete cable table, use the Delete Cable softkey. |
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To restore cable table, use the following softkeys: Restore Cable > ОК |
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To save cable list in file, use the Save Cable List softkey. To load cable list in file, use the Load Cable List softkey. |
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Velocity Factor
Velocity factor is used to calculate distance along a cable from the cable delay value. If the cable correction function is disabled, the software assumes it to be equal to 1. To obtain the accurate mismatch location in a cable, it is important to set the right velocity factor of the cable.
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To set the velocity cable, use the following softkeys: Analysis > Time Domain > Cable Correction > Velocity Factor |
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The velocity factor value can also be set by the selecting the cable in the cable list. |
Cable Loss
The cable loss value is used to compensate the signal attenuation in a cable. The cable loss value is set in dB per meter.
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To set the cable loss, use the following softkeys: Analysis > Time Domain > Cable Correction > Cable Loss |
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The cable loss value can also be set by the selecting the cable in the cable list. |
Frequency
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To set the frequency, at which the cable loss is specified, use the following softkeys: Analysis > Time Domain > Cable Correction > Frequency |
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