398 Chapter 12
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.
• “Electrical Delay” on page 398
• “Setting port extensions” on page 401
• “Phase offset” on page 400
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 (or ) and (or ) to activate the phase
trace for which you want to specify the electrical delay.
Step 2. Press .
Step 3. Press Electrical Delay.
Step 4. Change the electrical delay (in seconds) in the data entry area.
Step 5. Press Media, and select a media type for calculating the electrical delay. If the electrical
delay is 0 second, the calculation result is always the same regardless of media type.
Softkey Function
Coaxial Selects Coaxial as the media type.
Waveguide Selects Waveguide as the media type.
Step 6. If you have selected Waveguide as the media type, press Cutoff Frequency, and specify a
cutoff frequency.
NOTE The cutoff frequency is available only when the media type is Waveguide.
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 (or ) and (or ) to activate the trace for
which you want to set the electrical delay.
Step 2. Place the active marker in an appropriate position.
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