Thanks all � For a bit more information here is what I experience:
1. Set sig gen to 50 MHz, 0dBm
2. Measure signal using VSA == -16.25dBm
3. Set input attenuator for 40dB
4. Measure signal using VSA == -15.4dBm
5. Change sig gen to 1000Mhz, 0dBm
6. Measure signal using VSA == -16.2dBm
Changing the input attenuator does seem to change where the noise floor is but doesn抰 seem to impact the measured signal at all. This seems strange to me but I am far from proficient using this piece of gear.
BTW The unit passes all self-tests & alignments without error but does seem to exhibit a problem (reported here on the forum before) of the LAN connection losing it抯 IP address between reboots).
TonyG
Sent from Mail<> for Windows 10
From: 'hardy hansen' hardyhansen@... [hp_agilent_equipment]<mailto:hp_agilent_equipment@...>
Sent: Monday, July 10, 2017 4:59 AM
To: hp_agilent_equipment@...<mailto:hp_agilent_equipment@...>
Subject: SV: [hp_agilent_equipment] E4406A Input Attenuator
Yes
But it completes selftest--so the faullt has to be between rf input connector and rf switch(used only for cal)- first mixer.
The selftest checks frontend att 1 dB steps from 0-40 with a 50Mhz signal .
Hardy
Fra: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sendt: 10. juli 2017 05:43
Til: hp_agilent_equipment@...
Emne: Re: [hp_agilent_equipment] E4406A Input Attenuator
It sure could be something else. Even a low LO to the mixer.
----- Original Message -----
From: 'hardy hansen' hardyhansen@... [hp_agilent_equipment]<mailto:hardyhansen@...%20[hp_agilent_equipment]>
To: hp_agilent_equipment@...<mailto: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@...> [mailto:hp_agilent_equipment@...]
Sendt: 10. juli 2017 04:53
Til: hp_agilent_equipment@...<mailto: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]<mailto:hardyhansen@...%20[hp_agilent_equipment]>
To: hp_agilent_equipment@...<mailto: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@...>
[mailto:hp_agilent_equipment@...]
Sendt: 10. juli 2017 00:07
Til: hp_agilent_equipment@...<mailto: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]"
<hp_agilent_equipment@...>
To: <hp_agilent_equipment@...>
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
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10
From: Artek Manuals manuals@...
[hp_agilent_equipment]<mailto:hp_agilent_equipment@...>
Sent: Sunday, July 9, 2017 11:36 AM
To:
hp_agilent_equipment@...<mailto:hp_agilent_equipment@yahoogroups
.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@...<mailto: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
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