Re: HP 8341B RF sweeper has reduced output
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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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From: Bruce via groups.io
Sent: Thursday, March 3, 2022 9:04 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 8341B RF sweeper has reduced output
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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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