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| 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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