Measuring Electrical Length And Phase Distortion; Measuring Electrical Length; Electrical Length; Phase Distortion (Deviation From Linear Phase, Group Delay) - Agilent Technologies 8719ES 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
Preset
measurement settings include reducing the frequency span to eliminate under-sampled
phase response. Press the following keys as shown:
Trans:FWD S21 (B/R)
Meas
Center 134
Span 2 M/µ
Format PHASE
AUTO SCALE
Scale Ref
Figure
or on ET models:
M/µ

Measuring Electrical Length and Phase Distortion

1-33.
TRANSMISSN
Making Measurements
1- 43