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NOTE
You can use the LIMIT hot key to analyze your measurements with the user-definable
limit and Pass/Fail indication. See "Setting limit for cable and antenna analyzer" on page
516 for more information.
NOTE
You can go to MEASURE SETUP > Zone to view your measurements in detail with the
user-definable zoom zones. See "Setting zoom zones" on page 515 for more information.
Performing Smith chart measurements
The Smith Chart measurement is used to measure DUTs' impedance and phase to properly tune RF
devices. Smith chart also displays impedance-matching characteristics in cable and antenna systems
or filter and duplexer devices.
Making a measurement
Procedure
Make a proper cable connection as described in "Connecting a cable for reflection, DTF, 1-port
1.
phase, and Smith Chart measurements" on page 500.
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.
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.
NOTE
The instrument's built-in bias tee function (option 002) supplies 12-32 VDC bias to active
devices through the RF In port, eliminating the need of an external power supply.
NOTE
See "Performing reflection measurements" on page 502 for more information on how to
set other measurement setup parameters for the Smith Chart measurement.
Using Cable and Antenna Analyzer
JD780A Series Analyzers
511
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