Products > Test Equipment
HP3577A 5Hz-200Mhz VNA Teardown
sixtimesseven:
Today my replacement fan arrived. I could not get the Delta AFB1224HE anywhere so I went for the Sanyo 9WP1224H1011 which was in stock at farnell uk, specs:
99CFM / 0.283in
2600RPM
39dB
datasheet: https://www.mouser.ch/datasheet/2/471/San_Ace_120WP38_E-1286779.pdf
The fan is quiete. Hard to say if it is 10x quieter but it is an improvment. At the 27.5V from the HP3577 the temperatures from the termal camera seem to be about identical to the Muffin fan, at least if I measure at the heatsink of the power supply transistor which is just visible trough the left perforated side (about 51degC).
I do some further testing trying to reduce the fan voltage & noise. Also I will install some vibration dampeners for the fan since I hear some vibrations at the back panel.
bson:
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
sixtimesseven:
--- 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 ---
Good choice! I looked at that fan as well. However, my Digik. list was almost empty and tax&handling is very expensive for me so the Sanyo from farnell was about as expensive all included :palm:
I look forward to your findings!
Also, how will you attach the filter at the back with those rubber attachments you selected? Do you just pull them trough the hole stack? Please report back if they are strong enough to hold everyting together.
bson:
No idea how things will go together. I'll see when it comes here, but I have an assortment of long M4 screws, nuts, spacers, O-rings, etc, so even if the fasteners don't work I'll see what I can figure out. :) I can also mill a bracket from acrylic if needed.
sixtimesseven:
--- Quote from: bson on August 01, 2018, 10:00:18 am ---No idea how things will go together. I'll see when it comes here, but I have an assortment of long M4 screws, nuts, spacers, O-rings, etc, so even if the fasteners don't work I'll see what I can figure out. :) I can also mill a bracket from acrylic if needed.
--- End quote ---
Nice!
The hottest part I could find so far was R103 on the power board. At 28 ambient I get about 110-115degC with the original fan @28degC ambient and about the same for the Sanyo with 28V.
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