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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 for each channel and "fixed" by copy/paste from channel A (which is good) to B and R. I cleared the warning for channel R but channel B has still active error.
So the problem is confirmed, corrupted EEPROM... No more ideas, I don't know exactly bit functions, even here on group there are some vague references about (ID, Checksum, etc)
?
HP8757E EEPROMs file found on KO4BB website already tested, unfortunately are not compatible with C version.
?
73, Robert
?
?
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 placed the board on the inside of the counter on the right gable. This reduced the fan speed and also the noise substantially. I don¡¯t recall the temperature rise in steady state condition but it was uncritical.

G?ran
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 and 5248 counters.?
?
I can¡¯t find a temperature spec for the 140B in either the manual or my HP catalogs, but typically the high temperature limit is 50C. If you have a ¡°laboratory¡± environment with reasonable temperatures, the ¡®scope can get by with a quieter fan that blows less air.?

Jeremy?
?

On Tue, Apr 2, 2024 at 12:51?PM Tom Lee <tomlee@...> wrote:
You must have an Opt 101X (aka "strangling hamster"). If lubrication
doesn't take care of it, swap out the fan.

-- Cheers,
Tom

--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
Mall
Stanford University
Stanford, CA 94305-4070


On 4/2/2024 12:42 PM, n4buq wrote:
> Do all the 140-series scopes have extremely noisy fans?? My 140B is excessively noisy and I'm wondering if a different fan could be substituted.? I don't mind the wind noise all that much, the whine that's associated with it is pretty obnoxious.? I haven't lubricated it yet but I suspect that won't really knock down that whine very much (if at all).? Looking for suggestions.
>
> Thanks,
> Barry - N4BUQ
>
>
>
>
>






Don't forgot that most of the plug-ins have a mix of glassware generating lots of heat and Ge transistors that don't like heat, this will depend on the plug-ins installed.

Most of my 140x & 141x mainframes have a 115Vac ball bearing "Boxer" branded fan from IMC, I can't quite read the part number from the only picture I took with the filter removed.

David
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

On 03/04/2024 03:42, YO4HFU via groups.io wrote:
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 checksum test fail for sections B & R.
PCB already checked, all EEPROM lines found in good condition.

I would be grateful if someone could help me with a copy of the*U4 & U26
EEPROM - HP8757C*, in order to eliminate/understand the malfunction.

Robert
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 it could be chunks of dried grease
making noise as they get into stuff.

Most people that try to lubricate these fans don't realize
that there are two ball bearings in the motor, one you can
easily see if you remove the label, and the other spring
loaded to the other side of the fan. You have to lube them
both.

The motors come apart pretty easy. Usually, there is a "C"
ring, or a plastic washer like piece that is clipped over
a groove in the bearing shaft. Remove it, and the fan, and
both bearings will pop right out.

Then remove one seal from each bearing, and wash them out with
naptha, or varsol, or gasoline... It only takes a little, and
blow them try. Don't let them spin very fast, as it will
Brinel the bearing races.

Put a little dab of lubriplate in the bearing, and you are good
to go. Don't pack them full, that only turns the bearing into
a grease pump, and makes everything turn slow, and get hot.

Assembly is the reverse of disassembly.

-Chuck Harris


On Tue, 2 Apr 2024 15:42:51 -0400 (EDT) "n4buq" <n4buq@...>
wrote:
Do all the 140-series scopes have extremely noisy fans? My 140B is
excessively noisy and I'm wondering if a different fan could be
substituted. I don't mind the wind noise all that much, the whine
that's associated with it is pretty obnoxious. I haven't lubricated
it yet but I suspect that won't really knock down that whine very
much (if at all). Looking for suggestions.

Thanks,
Barry - N4BUQ
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 checksum test fail for sections B & R. PCB already checked, all EEPROM lines found in good condition.

?

I would be grateful if someone could help me with a copy of the U4 & U26 EEPROM - HP8757C, in order to eliminate/understand the malfunction.

?

Robert

?
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.? End-of-life ball bearing fans can drive you out of the room with their noise.

?

Bronze bushing fans stay relatively silent over time.? They will get noisy if they lose their lubrication and the wear on the bushing gets excessive.? Then there is the other side of the coin where a fan will freeze up if the lubrication dries out and gets hard or gummy.

?

Greg
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 3.5

(IMO) The major problem with using the less expensive cables is they will change characteristics when moved.? The cables designed for the NA are designed to be stable when moved.

Cheers!

Bruce
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 less, and it will be OK with the lower airflow.?

Jeremy?


On Tue, Apr 2, 2024 at 1:55?PM joe price <joeprice@...> wrote:
I have a HP5335 which has a verry niosy fan what should I replace it with?

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.
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 the proper lube point and see if that helps.

I do notice that if I restrict the air-flow with my hand, it gets a bit quieter. That's a bit impractical, though, as a workaround.

Thanks,
Barry - N4BUQ

You must have an Opt 101X (aka "strangling hamster"). If lubrication
doesn't take care of it, swap out the fan.

-- Cheers,
Tom

--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
420 Via Palou Mall
Stanford University
Stanford, CA 94305-4070


On 4/2/2024 12:42 PM, n4buq wrote:
Do all the 140-series scopes have extremely noisy fans? My 140B is excessively
noisy and I'm wondering if a different fan could be substituted. I don't mind
the wind noise all that much, the whine that's associated with it is pretty
obnoxious. I haven't lubricated it yet but I suspect that won't really knock
down that whine very much (if at all). Looking for suggestions.

Thanks,
Barry - N4BUQ
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

From: "David Wise" <d44617665@...>
To: "HP-Agilent-Keysight-equipment" <[email protected]>
Sent: Tuesday, April 2, 2024 2:46:42 PM
Subject: Re: [HP-Agilent-Keysight-equipment] HP 140 Series Fan Noise
On my 141T, I replaced the Rotron "Muffin" with a "Whisper".

Dave Wise
From: [email protected] <[email protected]> on behalf of n4buq <n4buq@...>
Sent: Tuesday, April 2, 2024 12:42 PM
To: HP-Agilent-Keysight-equipment <[email protected]>
Subject: [HP-Agilent-Keysight-equipment] HP 140 Series Fan Noise
?
Do all the 140-series scopes have extremely noisy fans?? My 140B is excessively noisy and I'm wondering if a different fan could be substituted.? I don't mind the wind noise all that much, the whine that's associated with it is pretty obnoxious.? I haven't lubricated it yet but I suspect that won't really knock down that whine very much (if at all).? Looking for suggestions.

Thanks,
Barry - N4BUQ
Re: HP 140 Series Fan Noise

 

I have a HP5335 which has a verry niosy fan what should I replace it with?
Re: HP 140 Series Fan Noise

 

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 and 5248 counters.?

I can¡¯t find a temperature spec for the 140B in either the manual or my HP catalogs, but typically the high temperature limit is 50C. If you have a ¡°laboratory¡± environment with reasonable temperatures, the ¡®scope can get by with a quieter fan that blows less air.?

Jeremy?


On Tue, Apr 2, 2024 at 12:51?PM Tom Lee <tomlee@...> wrote:
You must have an Opt 101X (aka "strangling hamster"). If lubrication
doesn't take care of it, swap out the fan.

-- Cheers,
Tom

--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
Mall
Stanford University
Stanford, CA 94305-4070


On 4/2/2024 12:42 PM, n4buq wrote:
> Do all the 140-series scopes have extremely noisy fans?? My 140B is excessively noisy and I'm wondering if a different fan could be substituted.? I don't mind the wind noise all that much, the whine that's associated with it is pretty obnoxious.? I haven't lubricated it yet but I suspect that won't really knock down that whine very much (if at all).? Looking for suggestions.
>
> Thanks,
> Barry - N4BUQ
>
>
>
>
>
Re: HP 140 Series Fan Noise

 

You must have an Opt 101X (aka "strangling hamster"). If lubrication doesn't take care of it, swap out the fan.

-- Cheers,
Tom

--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
420 Via Palou Mall
Stanford University
Stanford, CA 94305-4070

On 4/2/2024 12:42 PM, n4buq wrote:
Do all the 140-series scopes have extremely noisy fans? My 140B is excessively noisy and I'm wondering if a different fan could be substituted. I don't mind the wind noise all that much, the whine that's associated with it is pretty obnoxious. I haven't lubricated it yet but I suspect that won't really knock down that whine very much (if at all). Looking for suggestions.

Thanks,
Barry - N4BUQ
Re: HP 140 Series Fan Noise

 

¿ªÔÆÌåÓý

On my 141T, I replaced the Rotron "Muffin" with a "Whisper".

Dave Wise

From: [email protected] <[email protected]> on behalf of n4buq <n4buq@...>
Sent: Tuesday, April 2, 2024 12:42 PM
To: HP-Agilent-Keysight-equipment <[email protected]>
Subject: [HP-Agilent-Keysight-equipment] HP 140 Series Fan Noise
?
Do all the 140-series scopes have extremely noisy fans?? My 140B is excessively noisy and I'm wondering if a different fan could be substituted.? I don't mind the wind noise all that much, the whine that's associated with it is pretty obnoxious.? I haven't lubricated it yet but I suspect that won't really knock down that whine very much (if at all).? Looking for suggestions.

Thanks,
Barry - N4BUQ
HP 140 Series Fan Noise

 

Do all the 140-series scopes have extremely noisy fans? My 140B is excessively noisy and I'm wondering if a different fan could be substituted. I don't mind the wind noise all that much, the whine that's associated with it is pretty obnoxious. I haven't lubricated it yet but I suspect that won't really knock down that whine very much (if at all). Looking for suggestions.

Thanks,
Barry - N4BUQ
33220A Function Generator Option 001 External Reference replacement board

 

Finished the external reference board for the 33220A.
Located here:https://www.ebay.com/itm/156128323501
Best offer enabled on the listing.

ed
Re: Another draft: 8160A

 

Horror!?Just like scraping ¡°La Gioconda¡± for the paint¡­?like scraping ¡°La Gioconda¡± for the paint¡­
Re: 8510C - calibration 3.5/sma

 

On Tue, 2 Apr 2024 at 13:41, LeonP <leon.pavlovic@...> wrote:
Hi Tom,

thanks for the help. I agree with you.

However, my concern is the following: my cal kit is 3.5mm (it is in a fairly good condition) and the calibration assumes I also have the 3.5mm port cables (obviously HP sold you the 8510C with its 26.5GHz 3.5mm cal kit along with the 3.5mm port cables). However, I do not have the 3.5mm port cables, but SMA cables. Therefore there is a 3.5mm/SMA interface. I've seen the adaptor element in the HP cal kit table, what is the use of it?

Thanks!

I don't have time to look for it now, but someone created a paper where they modeled the effects of using a 3.5 mm calibration kit with SMA and 2.92 mm connectors. For 2.92 mm, a correction can be applied, but the variability among SMA connectors means that it's pointless using any correction, as the correction is small compared to the variability on the semi-precision SMA connectors. So essentially, don't worry about it.Chances are your DUT is likely to be SMA too.

--
Dr David Kirkby Ph.D
Kirkby Microwave Ltd
Email: drkirkby@...
Web:
Telephone 07910 441670 (UK) or +44 7910 441670 (international)
Registered in England and Wales, company number 08914892.?
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Essex, CM3 6DT
8961 - 8980 of 151662