Installation and Service Guide N5251-90001 6-11
PNA Series Microwave Network Analyzer System
N5251A
Performance Tests and Checks
System Performance Verification
16. When the calibration process is completed, you will be prompted to save the calibration
state to a file. Saving the calibrated state is recommended. The saved calibration may
be useful if it becomes necessary to remeasure the verification devices. Provide a name
for the file that will allow you to reuse the calibration as needed.
17. After completion of the full 2-port calibration, follow the prompts on the analyzer for
measuring the verification devices. Use
the match thru and mismatch thru verification
standards provided with the 85059A 1.0 mm Calibration and Verification kit. Connect the
devices between the test port cable and Port 1. The Match Thru and the Mismatch Thru
are very similar in appearance. The Mismatch Thru has a groove machined around its
circumference.
It is recommended to connect the Verification Stand
ards to the test port
cable on Port 2 prior to attempting to connect to Port 1. Then follow the
recommended procedure for making a thru connection outlined under
Step 15 on page 6-10 to avoid damaging the cable.
18. Whe
n the verification process has been completed for ports 1 and 2, you are prompted with
the directory location of the result files. Make a note of this directory for later reference.
19. If ports 3 and 4 were selected under the Configure tab earlier, you will be prompted to repeat
the process for those ports.
20. When you have completed the system verification process for all ports, and you have results
that represent current system performance, save the result files as described in “Saving
Verification Results” on page 6-16.
Verification Results Files
When Syste
m Verification is configured as recommended, the process produces five files for each
port pair - one text file and four.png files. The text file contains model numbers and serial
numbers of the PNA and 85059A kit, along with tabular lists of all results. The other files are
screen captures of the magnitude and phase traces for each verification device. All file names
contain the date and time of the system verification.
Refer to the example screen captures in Figure 6-6, Figure 6-7, Figure 6-8, and Figure 6-9. The
windows are labeled 1, 2, 3, and 4. Window 1 is S
11
, window 2 is S
21
, window 3 is S
12
, and trace
4 is S
22
. Two traces are shown for each measurement - a black trace and a colored trace. The
black traces represent the factory measured data for the verification devices. The colored traces
represent the actual measured data from the calibrated system.
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