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Date
Re: HP 140 Series Fan Noise
Thanks, Chuck.? ?Really interesting about oilite and bronze and such.? Stuff one wouldn't normally think about.? ? ? ? JimSent from my T-Mobile 4G LTE Device
By Jim Ford · #143236 ·
Re: 8510C performance verification program?
I've found the files at groups.io, so the remaining question is only, "Is the version A.05.01 for sale by Keysight only?"
By John Griessen · #143235 ·
8510C performance verification program?
I just received a paper manual for the 8510C system and on site service referring to version A.03.01 of the 8510C performance verification program.Keysight.com says, "The latest revision is A.05.01. "
By John Griessen · #143234 ·
Re: Anyone with a 3586B A80 board?
I have a spare A80 board 03586-66580 but I'm in the Netherlands. Shipping costs are +- USD 22 to the US. Board is free, it is from a unit I scrapped. Rene
By Rene@... · #143233 ·
10390A System Performance Analysis Software for 1650B logic analyzer
Hi all, I'm looking for a copy of the 10390A System Performance Analysis (SPA) Software for the 1650B logic analyzer, and it has so far eluded me, can anyone here help out? EBay has yielded plenty of
By Richard Halkyard · #143232 ·
Re: HP 140 Series Fan Noise
As a last ditch effort, sure, it might help. But an ordinary oil film won't allow wear until the oil disappears. Typically, an oilite bearing will have a piece of oil soaked felt touching the bearing
By Chuck Harris · #143231 ·
Re: HP 140 Series Fan Noise
I would look for a label, or perhaps a bit of steel, that is interacting with the magnetic barrel that is pressed inside of the fan's hub. Non ball bearings can't make noises like that. What I think
By Chuck Harris · #143230 ·
Re: HP 140 Series Fan Noise
So would it be worthwhile trying to lube these fans with graphite rather than any kind of oil? -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this
By Roy J. Tellason, Sr. · #143229 ·
5350B oscillator upgrade
I finally got the standard oscillator removed from the 5350B, recently I had trouble getting it out because it appeared to be seized on. How I got the oscillator off was by carefully individually
By DW · #143228 ·
Re: HP 8757C SWP DAC Fail
Thanks Hb9ica but the table you sent me refers to the main Error as in the first picture. the second step is "INSTRUMENT VERIFY" and the result is " DAC BIT CHECK", the third step is "ADC TEST - DAC
By maurit · #143227 ·
Re: Looking for 10K Potentiometer for HP 1404A Vertical Amplifier (HP P/N 2100-2828)
I happened to have an OHMITE 10k pot in my spare parts drawer and, from the outside, the resistive element looked the same. I disassembled it and, sure enough, it is the same as the one I broke so I
By n4buq · #143226 ·
Re: HP 140 Series Fan Noise
I tested it on the bench before installing it in the 140B and it still made the same noise. I tried different orientations and that didn't seem to make much, if any, difference. Thanks, Barry - N4BUQ
By n4buq · #143225 ·
Re: Agilent 54622D with broken digital inputs - Fixable?
Depending on where the chip came from, it might have been left over from a gold harvesting operation. The modern gold prospectors soak gold plated IC's, etc... in aquaregia, to remove the gold
By Chuck Harris · #143224 ·
Re: HP 140 Series Fan Noise
Hmmm? That could be mechanical interference, where some piece of insulation, inside of the motor, is brushing against something that is moving, such as the rotating magnetic field. Or, it could be
By Chuck Harris · #143223 ·
Re: Agilent 54622D with broken digital inputs - Fixable?
Use proper (= leaded) solder instead of the early, so-so, RoHS soldering on those scopes. That might help. While there: carefully check for tin whiskers too! Wilko
By Wilko Bulte · #143222 ·
Re: HP 140 Series Fan Noise
Again, no telling what went on with it before I got it; however, I don't hear any of those sounds. The noise I hear reminds me more of a model airplane engine (e.g. a 0.049", etc.) only quieter than
By n4buq · #143221 ·
Re: HP 140 Series Fan Noise
When an oilite bearing fails, it forces the shaft to move in and out... basically, dipping its toes into the unworn shaft area. The noise it makes sounds like "brum brum brum..." The next phase is
By Chuck Harris · #143220 ·
Re: HP 140 Series Fan Noise
Bronze, being porous, can pick up and retain dirt, which, mixed with oil, becomes grinding compound. That¡¯s what wears the steel axle. Jeremy
By Jeremy Nichols · #143219 ·
Re: HP 140 Series Fan Noise
When I had the bushing pulled from the shaft, cleaned the ID of the bushing with IPA and a cotton swab. I noted that there was just a bit of something black that came off on the swab and I presume
By n4buq · #143218 ·
Re: HP 140 Series Fan Noise
Hi Jim, Like it or not, oilite (aka sintered bronze) is more than just the bronze that forms its structure. Oilite, is made through a process called sintering. What is done is bronze particles and
By Chuck Harris · #143217 ·