Phase Offset; Specifying The Velocity Factor - Agilent Technologies ENA Series User Manual

Step 4. Specify the port extension for each test port.
Softkey
Extension Port 1
Extension Port 2
*1
Extension Port 3
*2
Extension Port 4
*1.Only with Options 313, 314, 413, and 414.
*2.Only with Options 413 and 414.

Phase Offset

Phase Offset is a function used to add or subtract a predetermined value relative to the
frequency to and from the trace. Using this function enables you to simulate the phase
offset occurring as a result of, say, adding a cable.
The phase offset can be specified from -360° to +360°.
Using the Phase Offset Function
Step 1. Press (or
which the phase offset will be specified.
Step 2. Press .
Step 3. Press .
Phase Offset
Step 4. Enter the phase offset (°) in the data entry area.

Specifying the Velocity Factor

The velocity factor is the ratio of the propagation velocity of a signal in a coaxial cable to
the propagation velocity of that signal in free space. The velocity factor for a common
cable is about 0.66. The propagation velocity depends on the dielectric constant (e
dielectric substance in the cable.
1
Velocity factor = --------
e
By specifying the velocity factor, you can match the equivalent length (in meters)
appearing in the data entry area to the actual physical length when using the "Electrical
Delay" on page 232 or "Port Extension" on page 232 to specify the electrical delay (in
seconds).
The velocity factor is common to all channels.
Using the Velocity Factor
Step 1. Press .
Step 2. Press
Velocity Factor
Step 3. Enter the velocity factor in the data entry area.
Chapter 11
Improving the Accuracy of Phase Measurements
Function
Specify the port extension (in seconds) for test port 1.
Specify the port extension (in seconds) for test port 2.
Specify the port extension (in seconds) for test port 3.
Specify the port extension (in seconds) for test port 4.
) and
r
.
Optimizing Measurements
(or ) to activate the trace for
) of the
r
233