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8. Testing cables not included in library

If the cable type to be tested is not in the library, then it can still be tested if

the Vp is known. If the Vp is unknown refer to Section 9.

Using the Key scroll to the bottom of the library and beyond, until you

nd the the Vp settings from 99% downwards.

9. How to determine unknown Vp settings

If the TDR is to be used with a cable type for which the Vp is unknown, this

rst must be determined.

1. Take a sample of the cable at least 60 feet in length

2. Measure its length by direct measurement

3. Connect to the TDR and adjust the Vp setting to give a reading of the

correct length .

This Vp setting can now be noted and used on unknown lengths of the

same cable type.

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Triplett TDR Manuale Utente Pagina 10