Service Guide N5227-90001 3-17
PNA Series Microwave Network Analyzers Tests and Adjustments
N5227A Preliminary Checks
Cable Connector Repeatability Check
NOTE The connector repeatability measurement should be done at the test port as well as at the
end of the test port cable.
1. With the test port cable still connected to Port 1, connect a broadband load to the other end of the cable.
2. Press UTILITY .
3. Press RESPONSE . Verify that is ON. If not, press the
softkey to toggle it ON.
The Averaging Factor box will appear directly above the display. In the Averaging Factor box, type 100 or
click the arrows to select 100, and then press ENTRY .
4. Wait for the analyzer to average the measurement 100 times (approximately five seconds).
5. To normalize the data trace: press MARKER/ANALYSIS , then , then
, t h e n , t h e n E N T R Y .
6. To adjust the display scale:
a. Press RESPONSE , then .
The Scale Per Division box will appear directly above the display. Set the Scale Per Division for 0.5
dB. Press ENTRY .
b. Press .
The Reference Level box will appear directly above the display. Set the Reference Level for 0 dB.
Press ENTRY .
7. Disconnect and then reconnect the cable to the test port. Tighten the connection to the specified torque
for the connector type.
8. Press RESPONSE , then .
9. Look at the trace for spikes or modes.
10. To re-normalize the data trace of the reconnected cable: press MARKER/ANALYSIS , then
, then ENTRY .
11. Repeat steps 7 through 9 at least three times to look for modes. Modes appear when a harmonic of the
source fundamental frequency is able to propagate through the cable or connector. It is helpful to print a
plot of the trace each time to compare several connections. If any mode appears each time the cable is
connected and reconnected, measurement integrity will be affected.
For a typical response of cable connector repeatability, see Figure 3-7.
12. For the Port 2, 3, and 4 Check, connect the cable (with the load attached) to the respective port and
repeat steps 2 through 11.
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