Re: E4407B strange peak shapes at low RBW
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Keysight will no longer sell the licenses for the N7800A unless you are a large company and want to do your own calibrations but the catch is that you HAVE to use the equipment that's written into the software.? It is a required list of equipment, not a suggested
list which leaves all but a very rare few who are able to do that. ? The cost of the required equipment, just the minimum runs about $100K "used" and that will allow you to do only a limited calibration on most pieces of equipment. ? Everything these days
is in software and very little can be done manually anymore due to the use of A/D's and D/A's and signal processing.? Those allow for great specs but at the expense of allowing for manual calibrations.
You pretty?much have to make the decision of whether or not you need what the later generation equipment can give you or do you want the ability to be able to do your own calibrations.? Of course cost is a huge consideration also.
I pretty much designed my lab around the ability to do the repairs and adjustments myself and have been happy with that decision.? There's a LOT of good equipment out there.
Richard Parrish
From: [email protected] <[email protected]> on behalf of Lothar baier via groups.io <Lothar@...>
Sent: Tuesday, May 31, 2022 9:02 PM To: [email protected] <[email protected]> Subject: Re: [HP-Agilent-Keysight-equipment] E4407B strange peak shapes at low RBW ?
HP used discrete filters for the IF filters , those filters are constructed using multiple poles that are coupled and each pole is adjusted individually to form a specific filter shape and bandwidth as a result if one pole is off than you get a funny shape like the one you are seeing ! On the older analyzers (855x, 8566/68, 70K, 8590¡..? the adjustments were done manually , you needed to build of some shorting clips or cables and follow the instructions on the manual and usually this worked quite well . However on the later model analyzers HP switched from manual adjustments and performance tests and providing HP basic test/alignment software free of charge to using a integrated test environment (N7800A )? with individual test modules for each analyzer family (N7811A for the ESA Series )? , this software requires a paid license however !? I am not aware of any alternate ways to do the adjustments however richard is the authority on this and he might know ? From: [email protected] <[email protected]>
On Behalf Of hardyhansendk via groups.io ? Hi Are you using an external test signal?-it seems so. First i would make a self alignment with the inbuildt? 50 Mhz cal signal. Hardy ? Fra:
[email protected] [mailto:[email protected]]
P? vegne af
Richard Parrish ? You will need to go in and adjust your Xtal and LC filters.? Not hard, just a pain. Richard From:
[email protected] <[email protected]> on behalf of Kalle Kempe via groups.io <kalle.kempe@...> ? Hello Everyone, ?
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