JDS Uniphase CellAdvisor JD780A Series, User Manual

Page: 512 / 592

JD780A Series Analyzers
512
Using Cable and Antenna Analyzer
Measurement example
Figure 263 Smith chart measurement
Performing 2-port vector measurements
The Vector measurement is used to perform faster and more accurate measurement with around 80
dB dynamic range. It also provides antenna isolation measurement. You can determine DUT
’s S
21
phase characteristic by selecting the measurement display type as Phase.
Making a measurement
Procedure
1.
Make a
proper cable connection as described in “Connecting a cable for 2-port vector
measurements
” on page 501.
2.
Press the MEASURE SETUP hot key.
3.
Press the Data Points soft key to change the resolution of your measurement, and then select
the data point option: 126 , 251 , 501 , 1001 , and 2001 . Changing the data point does not affect
current calibration.
NOTE
The larger number you choose, the higher resolution you get and the longer the
instrument takes to sweep and display results. Selecting the data point larger than what
you need for a measurement will result in unnecessarily long sweep time. It is
recommended that you select high resolution data points only for an instance of
measuring wide frequency bands or requiring precise measurement data.
4.
Toggle the Display soft key and select Magnitude to view measurements in dB or Phase in
degree.
5.
Optional . To turn the bias tee on, complete the following steps:
a. Toggle the Bias Tee soft key and select On .
b. Enter a value between 12 and 32 with 0.1 V step.
c. Enter the V soft key.