Device Response In The Time Domain - Agilent Technologies 8719D User Manual

7. lb enter the relative velocity of the cable under test, press:
and enter a velocity factor for your cable under test
Most cables have a relative velocity of 0.66 (for polyethylene dielectrics) or 0.7
Note
PTFE
(for
distance rather than return trip distance, enter one-half the actual velocity
factor. Then the markers read the actual round trip distance to the reflection
of interest rather than the "electrical length" that assumes a relative velocity
of 1.
dielectric
8.
In this example, the velocity factor was set to one-half the actual value, so the marker reads
the time and distance to the reflection.
9.
front panel keypad after each key press.
Figure 2-64. Device Response in the Time Domain
dielectrics). If you would like the markers to read actual one-way
= l/A, where Ed is the relative permittivity of the cable
velocity factor
,
M a k i n g M e a s u r e m e n t s