Keysight Technologies N5290/1A PNA Series Service Manual page 49

System Tests and Adjustments
The N5290/1A Millimeter Test System Preliminary Check
5. Both traces should track each other and look relatively flat. Refer to
3-7 on page
Figure 3-7 Typical Cable Return Loss Response (port 2 trace is displayed below)
6. While observing the traces, gently lift the cable (at or near where the
cable bends) up and down a few times. Traces should remain stable and
free from any major spikes or holes (≤0.1 dB p–p). Refer to
page
Keysight N5290/1A Service Guide
g. If your instruments are not warmed up for two hours, repeat step f.
Else, skip to next step.
3-13.
3-14.
Figure
Figure 3-8 on
3-13