Improving Phase Measurement Accuracy; Electrical Delay - Agilent Technologies ENA Series User Manual

Optimizing Measurements

Improving Phase Measurement Accuracy

Improving Phase Measurement Accuracy
This section describes the following functions that can be used to improve phase
measurement accuracy.
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•
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Electrical Delay

Electrical Delay is a function that adds or removes a pseudo-lossless transmission line with
a variable length corresponding to the receiver input. Using this function enables you to
improve the resolution in phase measurement and thereby measure deviation from the
linear phase. You can specify the electrical delay trace by trace.Depending on the media
type, the calculation method of the electrical delay, which is required to correct the phase
delay, differs.
Procedure
Step 1. Press
trace for which you want to specify the electrical delay.
Step 2. Press
Step 3. Press
Step 4. Change the electrical delay (in seconds) in the data entry area.
Step 5. Press
delay is 0 second, the calculation result is always the same regardless of media type.
Softkey
Coaxial
Waveguide
Step 6. If you have selected
cutoff frequency.
NOTE The cutoff frequency is available only when the media type is
For how to determine the deviation from a linear phase, see "Measuring the Deviation from
a Linear Phase" on page 505.
Procedure using marker
Step 1. Press
which you want to set the electrical delay.
Step 2. Place the active marker in an appropriate position.
398
"Electrical Delay" on page 398
"Setting port extensions" on page 401
"Phase offset" on page 400
(or
.
.
Electrical Delay
, and select a media type for calculating the electrical delay. If the electrical
Media
Function
Selects Coaxial as the media type.
Selects Waveguide as the media type.
Waveguide
(or
) and (or
as the media type, press
Cutoff Frequency
) and (or
) to activate the phase
, and specify a
.
Waveguide
) to activate the trace for
Chapter 12