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E4407B measures low above 3 GHz

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mbielman:
Discovered an issue w/my SA while testing a repaired ESG (E4437B). There is a slight dip at 1.7 GHz but above 3 GHz the amplitude is low by as much as 8 dB.
I read through this post (https://www.eevblog.com/forum/testgear/esa-instrument-adjustments/) but I do not think a mistuned YTM is the issue. (if I do the quick
test as suggested I see no change)

I contacted a calibration lab and they don't think it's a cal issue. They want to replace parts instead!

Looking through the TME docs it sure looks like some adjustments would help but no direct solution as of yet.

Also I do not have another SA w/range above 3 GHz, so I cannot do tests outlined in the service manual. :-(

See attached.

Anyone have a poor man's way of performing a tune up on these?

Mark

mbielman:
Added attachment!
(didn't take last time)

Aiy:
Hi there,
You can have a look over here:
https://www.eevblog.com/forum/testgear/esa-instrument-adjustments/

I had problems with my E4407B as well. Look at 6th reply
https://www.eevblog.com/forum/testgear/esa-instrument-adjustments/msg4245055/#msg4245055

If you can get OK signal through using the quick procedure, you have a shot at fixing it using the rest I describe there.

Best regards

mbielman:
Hello. Yes, I found your post and read it carefully. As I pointed out, I did the quick procedure you describe and saw no change in amplitude. My guess is that the YTM tuning
is NOT my problem. Amplitude above 3 GHz measure about 8 dB low up to 26 GHz.

regards

Aiy:
Oh, sorry. I did not read your post thoroughly enough, sorry about that. I saw your post over at the HP/Agilent/Keysight group also.

Can it be a stuck input attenuator? If you vary the input attenuator, does a peak marker change value?

Best regards

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