At least the HPAK step attenuators are high performance.? ?I checked the 40 GHz ones out not too long ago versus similar ones from JFW, and there was no comparison!? HPAK beat JFW on every single spec!? Price for used HPAK 84904L and 84906L on eBay is similar to new JFW 50P-2072.? Let the buyer beware!
Jim Ford
Sent from my T-Mobile 4G LTE Device
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-------- Original message --------
From: Lothar baier <Lothar@...>
Date: 3/3/22 7:22 PM (GMT-08:00)
Subject: Re: [HP-Agilent-Keysight-equipment] HP 8341B RF sweeper has reduced output
?
Here is the parts breakdown of the parts available for the step attenuators
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Sent from for Windows
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Those o rings always been a pain and agilent did not learn the lesson because the newer 50GHz attenuators had the same issue !? agilent used to sell the o-rings as well as the push rods with o-rings as parts but you had to go into their
parts system online to find the part numbers as the manual did not give any of the information I guess they figured nobody would fool around with this kind of stuff
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Sent from for Windows
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?
I would look at the solenoids before cleaning the pad contacts.? My?
guess is that one of the plungers is stuck due to a deteriorated "o"?
ring.
Cheers!
Bruce
Quoting Steve - Home <steve-krull@...>:
> In the 8340/41 the output power indicator is measuring power before?
> the attenuator so will indicated ¡°requested¡± power, not actual?
> output power. Band 0 is 10 MHz - 2.3 GHz, the swept LO is mixed with?
> the phase locked 3.7 GHz oscillator.
> Remove the front panel, remove the attenuator, loosen the end caps?
> of the attenuator (8 Allen screws) remove the nuts from the SMA?
> connectors for RF in and out, remove the name plate, remove the 20?
> hex head screws holding the front plate and SMA connectors and?
> GENTLY pry the front plate off. The attenuator pads are attached to?
> the front plate. Clean the contacts for each pad with 99.9%?
> isopropyl alcohol. Clean the through lines the same way. Usually?
> clears the problem.
>
> Steve
> WB0DBS
>
>
>
>> On Mar 3, 2022, at 5:56 PM, charlesterrebonne@... wrote:
>>
>> ?Hi all
>>
>> My HP 8341B sweeper looks like output down 10dbm~13dbm from?
>> requested level output...measured on a Boonton 4200 power meter?
>> know good.
>>
>> I rarely use it above 1Ghz... IIRC <2Ghz is band 0 didnt test other?
>> bands. I suspect an output step attenuator problem? a 10db pad?
>> "stuck"?
>>
>> Looking at power meter at right of front panel on 8341B I see it?
>> matches requested power output...shouldnt be showing -10~13dbm down?
>> from requested value if there is an attenuator problem since that?
>> value is measured at output?
>>
>> Anybody very familiar with these HP sweepers suggestions/tricks to?
>> save me time to address this? Ive fixed lots of test equipment but?
>> never this 8341B and its a *75 pound beast* that id like to fix and?
>> put back where it lives asap...its no fun to handle, flip over and?
>> move...
>>
>> Thanks all
>>
>
>
>
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