Technical data

Installation and Service Guide N5250-90001 6-9
PNA Series Microwave Network Analyzer System Performance Tests and Checks
N5250A System Performance Verification
Avoid damaging the cable once it is connected to port 2 when making the thru connection
between the two test heads. This is best done by placing the two test heads on a smooth
surface and gently sliding the right test head (port 2) towards the left test head (port 1).
8. Follow the instructions on the analyzer for performing a full 2-port calibration.The parameters for the
calibration are setup automatically by the program.
9. At the last step of the calibration sequence it is necessary to make a thru connection. To make the thru
connection, gently slide the right test (port 2) towards the left test head (port 1) a little bit at a time, while
turning the threaded ring on the left head test port connector by hand onto the cable attached to the right
test head. Do not use the threaded ring on the test port connector to pull the cable into the connector.
Repeat this process until the cable is firmly seated into port 1, then make the threaded ring barely finger
tight. Finally use the torque wrench on the port 1 threaded ring and a backup wrench on the cable to
tighten the connection.
10. When prompted to save the calibration, provide a name for the cal file that will allow you to reuse the
calibration as needed.
11. After completion of the full 2-port calibration, follow the instructions on the analyzer for performing the
system verification. Use the match thru and mismatch thru verification standards provided with the
85059A 1.0 mm Precision Calibration and Verification kit. Insert the devices as shown in Figure 6-4. The
Match Thru and the Mismatch Thru are very similar in appearance. The Mismatch Thru has a groove
machined around its circumference.
NOTE It is recommended to connect the Verification Standards 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 8 above to avoid damaging the cable.