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Re: HP 140 Series Fan Noise
It is easy to think that since HP equipment is designed for worst case environments such as overcrowded racks, high ambient temperatures and infrequent filter cleaning that it would be no problem to
By Harold Foster · #143139 ·
Re: HP 140 Series Fan Noise
Thanks, Chuck. The manual gives a procedure for lubricating the motor but, so far, I cannot find the places where it states to apply the oil. Apparently there should be holes to do that but I don't
By n4buq · #143138 ·
Re: HP 140 Series Fan Noise
Thank you so much for this. Lots of very good information. Interesting that you mention airflow direction. That's one thing that has puzzled me about this scope. There has been a lot of discussion
By n4buq · #143137 ·
Re: 8510C - calibration 3.5/sma
Good idea - I should have thought of that.
By Bruce · #143136 ·
Re: HP 140 Series Fan Noise
Hi. There are now three bearing types available:- Ball bearing. Sleeve bearing (often sintered bronze* sometimes a plastic material.) And Magnetic. (* With care, these can last a very long time.?
By Dave_G0WBX · #143135 ·
Re: HP 140 Series Fan Noise
Hi, I also had a horrible noise from the fan in my hp5335A counter. What I did was to place 15 ohm, ? W resistors and 10 of them on a circuit board, in series with the fan, a total of 150 ohm. I
By G?ran Krusell · #143134 ·
HP 3580A
Greetings, Anyone having a clue to the last date of manufacture of the HP 3580A ? Thanks ! ----- Best regards, Goran Finnberg The Mastering Room AB Goteborg Sweden E-mail: mastering@... Learn
By Goran Finnberg · #143133 ·
Re: HP8757C CORRUPTED EEPROM
Hello Razvan, Thanks for reply. I will wait for your EEPROM files, if is possible.?I don't expect to get the initial accuracy, but could find a compromise. In meantime I identified the memory areas
By YO4HFU · #143132 ·
Re: HP 140 Series Fan Noise
Hi, I also had a horrible noise from the fan in my hp5335A counter. What I did was to place 15 ohm, ? W resistors and 10 of them on a circuit board, in series with the fan, a total of 150 ohm. I
By G?ran Krusell · #143131 ·
Re: HP 140 Series Fan Noise
On Tue, Apr 2, 2024 at 08:43 PM, Jeremy Nichols wrote: > > My recently acquired HP-140B (yesterday!) has a fairly noisy fan. If it > becomes bothersome, I¡¯ll replace it, as I did the fans in my 5245
By factory · #143130 ·
Re: HP8757C CORRUPTED EEPROM
Hello Robert, I have an 8757C. I bought for it the 4th channel board but didn't have time to update it. I will try to desolder the EEPROMs this week and make a backup. 73! Razvan
By Razvan Popescu · #143129 ·
Re: HP 140 Series Fan Noise
The whine is the ball bearings rolling on a not so smooth race. The problem could be the metal of the race has been brinelled by the balls smacking on it... kind of like little ball peen hammers. Or
By Chuck Harris · #143128 ·
HP8757C CORRUPTED EEPROM
I facing with corrupted calibration content of EEPROM for channels B and R. The issue appeared after I unsoldered the 2816 EEPROMs in order to make a backup by TL866... I suspect U26 content, probably
By YO4HFU · #143127 ·
Re: HP 140 Series Fan Noise
There are basically fans with two types of bearings out there ¨C ball bearing & bronze bushing. Ball bearing fans start out with more noise and will simply get noisier over time as they wear.
By Greg Muir · #143126 ·
Re: 8510C - calibration 3.5/sma
You could consider using SMA-3.5 adapters on the end of the SMA cables.? Given that, the calibration routine in the 8510 should correct for the "defects."? But this will only work if the DUT is also
By Bruce · #143125 ·
Re: HP 140 Series Fan Noise
Shop for a physically similar fan (for ease of installation) with a lower current spec. It will blow less air and, hence, make less noise. Make sure the 5335 stays in a cool environment, say 80F or
By Jeremy Nichols · #143124 ·
Re: 8510C - calibration 3.5/sma
adapter element in cal kit..... Used in the adapter removal cal process where the DUT is set up as a non insertable 2 port.
By alan victor · #143123 ·
Re: HP 140 Series Fan Noise
I don't know what that option is. The manual states the 140B doesn't have options and anything aside from the standard configuration is installed at the factory. I'll see if I can get some oil in at
By n4buq · #143122 ·
Re: HP 140 Series Fan Noise
I don't know what kind of fan is in mine. It appears to have had a large round sticker attached to the back of it but that's gone. All I know is it's a line-voltage fan. Barry - N4BUQ
By n4buq · #143121 ·
Re: HP 140 Series Fan Noise
I have a HP5335 which has a verry niosy fan what should I replace it with?
By joe price · #143120 ·