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Re: E4406A Input Attenuator
¿ªÔÆÌåÓýok You use the input att to optimize your dynamic range of the analyzer--thats first of all determined by ?the first mixer 2d 3d ?compression point.Most hp analyzers are made to use the full dynamic range with signals below -20dBm--one normally use the input att to place the input signal at that range to have the max dynamic range---or optimize when using an external low noise preamp. Hardy ? Fra:
hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] ? ? This is normal when you chance att settings-all
but noisefloor will remain ----- Original Message -----
From: 'hardy hansen' hardyhansen@... [hp_agilent_equipment]<mailto:hardyhansen@...%20[hp_agilent_equipme nt]> To: hp_agilent_equipment@... .com> Sent: Sunday, July 09, 2017 11:05 PM Subject: SV: [hp_agilent_equipment] E4406A Input Attenuator Tom et al If the loss is exactly 15 DB i would look for something else. Regards Hardy Fra: hp_agilent_equipment@... .com> [mailto:hp_agilent_equipment@...] Sendt: 10. juli 2017 04:53 Til: hp_agilent_equipment@... .com> Emne: Re: [hp_agilent_equipment] E4406A Input Attenuator I'm betting it is the GaAs spdt rf switch on the input that has the loss. ----- Original Message ----- From: 'hardy hansen' hardyhansen@... [hp_agilent_equipment] nt]> To: hp_agilent_equipment@... .com> Sent: Sunday, July 09, 2017 9:38 PM Subject: SV: [hp_agilent_equipment] E4406A Input Attenuator Tom Have sent the rf clip to tony--the pictures you are asking for are very easy to find on the internet Fra: hp_agilent_equipment@... .com> [mailto:hp_agilent_equipment@...] Sendt: 10. juli 2017 00:07 Til: hp_agilent_equipment@...<mailto:hp_agilent_equipment@yahoogroups .com> Emne: Re: [hp_agilent_equipment] E4406A Input Attenuator Can you get a few good pictures of the RF section and post them? Maybe we can identify how they did the attenuators. Some that I have seen used Gaas smt spdt RF switches for the attenuators. Later 8657 sig gens did this. Regards ----- Original Message ----- From: "Tony Goodhew tony_goodhew@... [hp_agilent_equipment]" To: Sent: Sunday, July 09, 2017 5:56 PM Subject: RE: [hp_agilent_equipment] E4406A Input Attenuator Thanks I took the unit apart, including opening up the A17 RF Assembly, and there didnt appear to be any mechanical relays in there. I couldnt find any information on the components closest to the RF input to identify any solid state relays or programmable attenuators. In checking around I saw that Agilent promised in 2014 to post the CLIPs for the E4406A but they dont seem to have followed through on that. Does anyone happen to have them and could send me the A17 one? Thanks, TonyG Sent from Mail for Windows 10 From: Artek Manuals manuals@... [hp_agilent_equipment] Sent: Sunday, July 9, 2017 11:36 AM To: hp_agilent_equipment@... .com> Subject: Re: [hp_agilent_equipment] E4406A Input Attenuator Sounds like you on the right track , If you lucky the relay is just stuck as you say and you might exercise your way out of it... could also have suffered from input overload ...a bit harder to fix On 7/9/2017 2:30 PM, tony_goodhew@... [hp_agilent_equipment] wrote: Hi All, I just acquired an E4406A and put it on my bench. It seems to work fine except that it is consistently reading 15dB low. Poking around I found a control for the input attenuator and that seems to have no impact on the measured value. From there I looked at the services/test guide and ran through the 50MHz Input Attenuator Accuracy test and that showed no change so I think that the attenuator is stuck. Before I start pulling this apart I thought I might check in to see if I'm missed something in the system settings that might cause this? Thanks, TonyG -- Dave Manuals@... www.ArtekManuals.com [https://ipmcdn.avast.com/images/icons/icon-envelope-tick-round-orange-anima ted-no-repeat-v1.gif] m_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclien t&utm_term=oa-3176-b> Virus-free. www.avast.com =email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_te rm=oa-3176-b> [Non-text portions of this message have been removed] ------------------------------------ ------------------------------------ ------------------------------------ Yahoo Groups Links paign=sig-email&utm_content=emailclient> Virusfri. paign=sig-email&utm_content=emailclient> www.avg.com [https://ipmcdn.avast.com/images/icons/icon-envelope-tick-green-avg-v1.png]< http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_camp aign=sig-email&utm_content=emailclient> Virusfri. www.avg.com ink&utm_campaign=sig-email&utm_content=emailclient> [Non-text portions of this message have been removed] ------------------------------------ ------------------------------------ ------------------------------------ Yahoo Groups Links --- Denne mail er kontrolleret for vira af AVG. http://www.avg.com
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