----- Original Message -----

From: 'hardy hansen' hardyhansen@... [hp_agilent_equipment]

To: hp_agilent_equipment@...

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@... [mailto:hp_agilent_equipment@...]
Sendt: 10. juli 2017 04:53
Til: hp_agilent_equipment@...
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]

To: hp_agilent_equipment@...

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@...
[mailto:hp_agilent_equipment@...]
Sendt: 10. juli 2017 00:07
Til: hp_agilent_equipment@...
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@...>
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

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