IFR 2398 spectrum analyzer

[Domrich]

Hi Everybody
I got a IFR2398 with a curious issue.
All tests pass and especially level test.
The level show 15dB under the right level whatever is the frequency and the level of the input signal. Excepted this everything is OK and absolutely no error is reported.
The input level is verified with other generators and analyzer.
I cannot figure out how it is possible. I have checked the input HF block and for me it is OK.
Has somebody already seen that? Any idea? I do not know what to check!!
Dominique

[orbanp]

Hi Dominique,

I can not offer real help, but have you seen this thread:
https://www.eevblog.com/forum/repair/aeroflex-ifr-2398-calibration-repair-help/

They also mentioned there a Yahoo group for that particular SA.

Peter

[Domrich]

Thanks Peter. I will study this thread carefully.
And register to thid yahoo's group.
DR