Test Profile - SSTDR

The top part of this form is common to all Test Profiles, see Test Profile - Common Fields for more details.

The SSTDR has 2 modes available, Static and Dynamic.  Static is a complex test that spans a number of key frequencies to create an accurate distance to fault calculation; this test can take up to 1sec for each run of the test.  Dynamic is a faster and defined test that provides distance to fault on a specified frequency and it will count the number of changed states in a given test.

Allow Continuous Looping allow the test to loop until halted; this mode can only be performed if the SSTDR application is visible.

SSTDR setting detailed are specific to the UUT and the TPs being tested.

The VOP (Velocity of Propagation) is a decimal percentage of the speed of electrons in cable compared to the speed of light.  Different cable types have different VOP values; even a similar cable type but laid out straight vs a coiled cable will have a slightly different VOP.  The VOP needs to set for a give cable type and configuration.

The frequency is defaulted to 3Mhz which is a mid-range frequency for the SSTDR for most applications.  If the UUT's TPs are longer, then use a lower frequency, if shorter, then a higher frequency.  This parameter is locked because swapping frequencies can  takes up to 3secs; User need to be aware that if a sequence of tests are scheduled where the frequency keeps changing between Test Profiles, then a full test could take quite a long-time.  Use the Unlock button to allow the changing of the frequency setting.

The Gold value is defined in meters and is directly related to the VOP; if the VOP changes, then the Gold value will change.  The Gold value can be set as either a theoretical value for this test or can be set as part of the SSTDR Testing.  If a true Gold has already been set, shown by Trace values (as shown), then any changes to the Gold values, will null and void the Trace values and this will be set to 'None'.

The Normal State is provided to allow the User to define if the cable is normally Open or Close circuit.

These fields are used to set the tolerances that will be used during the SSTDR test using this profile. 

Both Tolerance fields can be expressed in a number of different formats, ie as a absolute value in meters or as percentage of the Gold value.  If the value is in the 'Plus' field, then this tolerance is added to the Gold value; conversely if the value is in the 'Minus' field then this tolerance is subtracted from the Gold value.  These upper and lower tolerances are then compared to the measured value.  Examples formats are as follows:

This field shows the Trace values captured and plotted by the SSTDR.  These values can be selected and then copied to the clipboard; then plotted using an external application.

This field cannot be edited.