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@...>:
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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
