Anritsu sitemaster S331D

[1VOX]

I have a faulty S331D. It reports integrator failed at start and VNA integrator failed during self test. When measuring the return loss, I feel it works. You don't know where to look for the error.
Thank you

[vishaldotgupta]

your unit has faulty RF section.  most probably MMIC is cause of failure in such cases.  is your unit a single port or two port version.  I mean the two port unit comes with internal power meter option and has two N female test ports on the front panel

[1VOX]

I have one port.

[ME]

How about doing a sweep and see if it has rf coming out of its ass.

[1VOX]

We will try it. The results of the measurement are probably correct. For loads of 35, 75 and 100 Ohm, it shows the correct return loss.