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
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
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Re: HP 140 Series Fan Noise
I have a HP5335 which has a verry niosy fan what should I replace it with?
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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.?
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
>
>
>
>
>
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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
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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
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Re: HP 140 Series Fan Noise
On my 141T, I replaced the Rotron "Muffin" with a "Whisper".
Dave Wise
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Show quoted text
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
|
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
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Horror!?Just like scraping ¡°La Gioconda¡± for the paint¡?like scraping ¡°La Gioconda¡± for the paint¡
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Re: 8510C - calibration 3.5/sma
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
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Re: 8510C - calibration 3.5/sma
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!
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hp8565a knob freq span/div
Hi, I'm looking for the knob for hp8565a
frequency span/div manual code 08565-60043
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thank
Roberto
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Re: HP 606B Frequency Dial
Thank you, Steve.
Your scan I will be able to use as a background in my CAD system to recreate the dial on photo paper.
Thanks,
Mark
Sent from
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Hi Mark
Attached is a scan of the dial from my parts machine, its not perfect as it has black dot marks on it, but it may be a start for you. Its currently in PDF but if you want it scanned in some other format let me know, you may be able to edit the worst marks out.
Cheers? Steve.?
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Re: HP 606B Frequency Dial
Hi Mark
Attached is a scan of the dial from my parts machine, its not perfect as it has black dot marks on it, but it may be a start for you. Its currently in PDF but if you want it scanned in some other format let me know, you may be able to edit the worst marks out.
Cheers? Steve.?
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Re: Dymec 2460A/M3 plugin manual?
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Dymec 2460A/M3 plugin manual?
Any chance someone here has a PDF of the manual for these things? I've found some hard copies on eBay so that might be a last resort, but if I can avoid spending $50AUD just for curiosity that'd be nice
I can't even remember when or where I picked this thing up (I suspect in a bulk lot at some point), it's been on the shelf for years but recently I finally found a power cable for it and gave it a test to find it does in fact work.?
There really doesn't seem to be much info out there about these things, but it looks pretty handy for a handful of tasks
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Hello Group,
?
I am currently restoring a HP 606B. Unfortunately, the dial markings are badly scratched/worn.
Does anyone have, or would care to take, a high-resolution copy of this dial? The dial scale is 7.5¡± in diameter.
?
Thanks for reading,
?
Mark
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Re: Service Notes on HPWiki
It's Official! We now have more than Keysight has on their dedicated Service Notes site () - over 4000!
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This is not an April Fool's joke - I just finished reconciling the last >100 notes and added them to HPWiki.
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I am planning to compare HPWiki <-> Keysight every few months and bring any new notes over. Will be interesting how many they publish on?average.
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And if they get rid of any notes on their site, we will still retain a copy.
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I am hoping that eventually someone will find and make available a treasure trove of old Service Notes that are no longer available from Keysight.
Best,
Wolfgang
KI7PFX
?
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Re: 8510C - calibration 3.5/sma
Hi Leon,
it depends on how accurately you know the properties of your cal elements.
Do you still have the kit parameters of the manufacturer?
If so, do the standards still obey these parameters, i.e. not worn, clean?
Cables are another issue. Are your test cables stable when you move them, i.e. amplitude stability, phase stability?
As far as I have found out, the 8510C assumes the load standard to be ideal. Thus, the return loss of your load will limit accuracy of measured reflection coefficients near the 50 Ohms point, while short and open will impact high reflection coefficients.
Transmission is yet another story.
Sorry, no simple answers possible.
Best regards,
Tom
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8510C - calibration 3.5/sma
Hello group!
Is there anyone here using the 8510C with a mechanical 3.5 kit?
I have a mechanical 3.5mm 26.5GHz cal kit, but my port cables are 18GHz SMA.
What is the proper calibration sequence for such a setup? And what kind of performance can I expect (Sxx levels)?
Many thanks,
Leon
PS: I've sent the same message to the svna group weeks ago, but the moderator probably denied it, since it never came through, no help there.
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Unfortunately, the gold plating on the many boards in these makes them a target of the gold scrappers.
I am lucky to have one of these generators in excellent condition with the 020 option and use it from time to time.
Peter
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On 4/1/2024 9:41 AM, Gianni Becattini via groups.io wrote:
As usual, any contribution/correction welcome. Thanks
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Jeremy Nichols
Dr. David Kirkby, Kirkby Microwave Ltd
Roberto