Products > Test Equipment
HP3577A 5Hz-200Mhz VNA Teardown
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precaud:

--- Quote from: bson on August 01, 2018, 09:38:16 am ---I'll experiment as well.  Ordered a relatively inexpensive fan and dampeners:

https://www.digikey.com/product-detail/en/G1238L24B1-FSR-EM/1570-1785-ND/8120198/?itemSeq=268069836
https://www.digikey.com/product-detail/en/LZ550/381-2709-ND/5043883/?itemSeq=268069888

--- End quote ---

Any progress on your fan replacement?
bson:

--- Quote from: precaud on August 12, 2018, 01:16:29 pm ---
--- Quote from: bson on August 01, 2018, 09:38:16 am ---I'll experiment as well.  Ordered a relatively inexpensive fan and dampeners:

https://www.digikey.com/product-detail/en/G1238L24B1-FSR-EM/1570-1785-ND/8120198/?itemSeq=268069836
https://www.digikey.com/product-detail/en/LZ550/381-2709-ND/5043883/?itemSeq=268069888

--- End quote ---

Any progress on your fan replacement?

--- End quote ---
I have the fan but haven't taken the time to remove the instrument from where it sits to open it up yet...  Given its size and weight that's a 2 person job. :/

Berni:
And i have fixed the clicky snagging switches on mine with a quicker fix:
https://www.eevblog.com/forum/testgear/hp-4145b-semiconductor-analyzer-repair-with-photos-(display-garbage-dead-rom)/msg1743731/#msg1743731

They all work perfectly now
precaud:
Any update from folks who have replaced the 3577A fan with a quieter one?
Berni:
These fans often tend to be pretty high performance fans with a ton of airflow. So most equivalent fans that move the same amount of air are not going to be significantly quieter.

But in a lot of cases these fans are overkill in the first place. They are designed to keep the thing cool when its stuffed snugly into a big rack of equipment that is pumping out heat and perhaps the rack placed into a industrial environment as part of a automated test setup. So what i did instead is slow the fans down by inserting a resistor in series with them, a lot of these fans actually get quite quiet when ran a bit slower, but when doing this i always check the temperature of the hottest components to make sure im not causing anything to overheat by slowing it down too much.
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