Measuring Electrical Length And Phase Distortion; Measuring Electrical Length; Electrical Length; Phase Distortion (Deviation From Linear Phase, Group Delay) - Agilent Technologies 8753ET User Manual

Measuring Electrical Length and Phase Distortion

Electrical Length

The analyzer mathematically implements a function similar to the mechanical "line stretchers" of earlier
analyzers. This feature simulates a variable length lossless transmission line, which you can add to or
remove from the analyzer's receiver input to compensate for interconnecting cables, etc. In this example,
the electronic line stretcher measures the electrical length of a SAW filter.
Phase Distortion
The analyzer allows you to measure the linearity of the phase shift through a device over a range of
frequencies and the analyzer can express it in two different ways:
• deviation from linear phase
• group delay

Measuring Electrical Length

1. Connect your test device as shown in
Figure 1-33 Device Connections for Measuring Electrical Length
2. Press and choose the measurement settings. For this example, the measurement settings
Preset
include reducing the frequency span to eliminate under-sampled phase response. Press the following
keys as shown:
Meas Trans:FWD S21 (B/R)
Center 134
Span 2 M/
PHASE
Format
Scale Ref AUTO SCALE
You may also want to select settings for the number of data points, averaging, and IF bandwidth.
Figure 1-33.
or on ET models:
M/

Measuring Electrical Length and Phase Distortion

TRANSMISSN
Making Measurements
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