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Re: HP 8970B noisy fan

 

In general the fans can be taken apart and new light grease/oil added.
Its tricky and all I can say is watch out for the little c clip to fly out when you take one apart. Sometimes you can even find replacement bearings. If its a sleeve bearing all you can do is grease it and hope. Generally tends to work.
Regards
Paul
WB8TSL
Re: HP8903B - Plotting from HP-IB

 

Thanks Tony, thanks Dave,
 to avoid troubles too much I bought an HP82357B interface GPIB <-> USB with the hope that it will work with keysight software (VEE, I / O, VISA, etc.). I am waiting to receive it.

-- Cheers
? ? Attilio
Re: Selling experience, sorry OT again

 

I have no experience with ebay Australia but in France very common to accept only a French bank ch¨¨que sent via post.

Many French sellers restrict auctions to French only and shun PayPal.

I have completed many ebay.fr purchase over years pay via check, in € no PayPal no fees!

PayPal and ebay fees are ever more complex and increasing, without VAT we would ask at least 10% extra from the buyer to cover,the fees and then add VAT.

Finally the incredible Brexit international shipping and new EU VAT led us to never ship or buy anything from UK, as the extra costs and government paperwork is not working the cost or wasted time.

We ask our UK customers to arrange and pay for shipping, and pick-up at our USA location, INCOTERM EXW.

Bon journ¨¦e


Jon
3325A Adjust

 

To calibrate the 3325A, the thermal converter P / N 11050A is required, I ask if you are aware of an alternative method for this calibration step, which is impractical even if you manage to find the thermal converter 0853-0001 from Best Productis.
Re: HP 8970B noisy fan

 

Hi Marc,

I would try a 220 volt type of fan. I did that on a number of Tektronix and HP equipment with very good results. There is still a good amount of airflow which would be ample sufficient for the 8970. You wouldn't use it at ambient temperatures beyond 40¡ãC, would you?

cheers
Martin
Re: Selling experience, sorry OT again

 

On Thu, 17 Feb 2022 at 10:35, Froggie the Gremlin <jonpaul@...> wrote:
PayPal fees for FX are incredibly high, 3..5% worst foreign currency exchange rate, plus fees, etc.

You always have the option to dump epay all together and simply sell on your own website, our firm has done so since 1995, and never sell on epay.

I do that - see for example?


However, eBay waa?
1) Another outlet for selling?
2) A way to drive customers to our website. Some people would see the company name and Google it, then realise it was cheaper to but direct, rather than through eBay. ?

For epay, What about payment via bank transfer? Physical paper bank check? Still.aloowed?

Not to my knowledge outside ebay.au
(Australia), where there are specific Australian laws that meant eBay could not deny people the option of bank transfer. ?eBay may have found a way around that.?

If it was not for the fact that I believe that it would raise suspicions as a ?company, I would be tempted to look at accepting bitcoin. Nano is an interesting cryptocurrency. I have never used it, but there are no fees and according to Wikipedia, transactions are confirmed in under 1 second. These all rely on you trusting the person that you are dealing with. There would be a small fee (< 0.5%) to convert the crypto to USD or whatever one wants.


Jon

Dave

--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...

Telephone 01621-680100./ +44 1621 680100

Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United Kingdom
Potentiometer for HP5315 / 5316 counters : 2100-3719

 

Folks,
As part of a 5316A restoration project, I am looking for the "gate time" potentiometer which is used in the 5315 and 5316 counters.
It is a PCB-mounted 470K potentiometer with a CCW switch. The part-number is 2100-3719.
If anybody has a spare, I'd be most happy to pay a reasonable price + shipping !
Thanks,
Joel Setton
Re: HP8903B - Plotting from HP-IB

 

¿ªÔÆÌåÓý

Re:-

From: Tony Goodhew
Date: Thu, 17 Feb 2022 17:30:00 PST

From memory, all of Pete's software is VEE based so it expects a VISA supported GPIB adapter.

The Prologix is a great little adapter but isn't VISA supported, I think you'll need to get a HPAK or NI one to get it to work.

TonyG?


Depending on your OS etc, there are VISA implementations that will support the Prologix (and clones with a little work.)

But, there are differences between (for example) NI's VISA, and HPAK's VISA.? That, and it is impractical to bad, to have more than one version of the VISA architecture installed on any one PC.?? As we found to our cost and frustration at work.

It is a shame that the respective installers do not check for a pre-existing install of others, or even an earlier version from the same stable.

VISA is a good system, but it is bloated and can become very unstable under mismatch situations, even to the extent of taking down the OS!


73.

Dave G8KBV


-- 
Created on and sent from a Unix like PC running and using free and open source software:

Re: HP 8970B noisy fan

 

¿ªÔÆÌåÓý

I am facing similar task to quiet by HP5345A counter, and that is very loud beast. Mouser has very wide selection of 115V fans where I am just now selecting proper one. In Europe you can also try TME.eu, they also have some 115V fans on stock.


Vladimir


Dne 18.02.2022 v 7:51 n8zmTWH@... napsal(a):

I don¡¯t have the 8970B schematic in front of me, but I¡¯d guess that if there is a 115VAC? fan, it is connect across half of the 230 VAC wired primary of the power transformer.

?

As for reducing the noise, I have on other HP boxes put a power resistor in series with the fan to reduce the supply voltage. I don¡¯t recall the value I used but the fan nameplate should tell you the current it draws at 115, and you can calculate a rough guess as to the resistor value and power rating. As the HP boxes are designed with the idea of being stuffed in a rack with other instruments also adding heat, and allowing for the air filter to be somewhat clogged with dust, half speed will still move plenty of air assuming you are not operating under those conditions. That should substantially reduce the noise, but the squeaking will probably require some sort of attention. Some light oil might be sufficient to determine if the bearings just are dry. Your decision on what to do at that point.

?

From: [email protected] <[email protected]> On Behalf Of Marc73
Sent: Friday, February 18, 2022 1:03 AM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] HP 8970B noisy fan

?

I have an older HP 8970B which is however in good condition. Just one thing is annoying, the fan is very noisy and makes a loud squeaking noise. I guess the bearing has become bad.

As this fan is 115V (even though the insrument is used with 230V) it's not that easy to get such a fan replacement in Europe. Has anyone some advice how to get the fan quiet? Some oil at the right position? So far I did't tear down the fan as I don't want to berak it...

Re: HP 8970B noisy fan

 

I have replaced noisy 115VAC fans with 12VDC Noiseblocker Black Silent Pro PL-2 fans from Germany. For my 140S, I bought a 120mm but they have other sizes. There is a retailer in Ireland that ships to the EU rather easily:


The fan is thinner than the original which made installation a bit easier. The caveat is you will need to create a small board to convert the 115VAC to 12VDC using four 1N4007, four 1/2W resistors to halve the voltage twice 110 -> 55 -> 27.5 to meet the upper threshold of the 7812, and a 1uF 35V electrolytic filter capacitor. The fan is so silent one can hear the subtle buzzing of the transformer. I opted to construct two aluminum 90-degree bends from the upper pair of fan-transistor plane bolts to attach the circuitboard parallel such that it was under the level of the cover.

I also had to make some custom bolts from a longer piece of M4 from a Bauhaus to attach the cooling planes for the four power transistors - also with some M4 washers, etc because of the difference between SAE and metric. The result is very nice but I had to run the fan from an external battery while testing/building the conversion circuit to keep the transistors cool.

You can get the datasheet from here:



Christopher

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Re: HP 8970B noisy fan

 

¿ªÔÆÌåÓý

I don¡¯t have the 8970B schematic in front of me, but I¡¯d guess that if there is a 115VAC? fan, it is connect across half of the 230 VAC wired primary of the power transformer.

?

As for reducing the noise, I have on other HP boxes put a power resistor in series with the fan to reduce the supply voltage. I don¡¯t recall the value I used but the fan nameplate should tell you the current it draws at 115, and you can calculate a rough guess as to the resistor value and power rating. As the HP boxes are designed with the idea of being stuffed in a rack with other instruments also adding heat, and allowing for the air filter to be somewhat clogged with dust, half speed will still move plenty of air assuming you are not operating under those conditions. That should substantially reduce the noise, but the squeaking will probably require some sort of attention. Some light oil might be sufficient to determine if the bearings just are dry. Your decision on what to do at that point.

?

From: [email protected] <[email protected]> On Behalf Of Marc73
Sent: Friday, February 18, 2022 1:03 AM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] HP 8970B noisy fan

?

I have an older HP 8970B which is however in good condition. Just one thing is annoying, the fan is very noisy and makes a loud squeaking noise. I guess the bearing has become bad.

As this fan is 115V (even though the insrument is used with 230V) it's not that easy to get such a fan replacement in Europe. Has anyone some advice how to get the fan quiet? Some oil at the right position? So far I did't tear down the fan as I don't want to berak it...

Re: HP 8970B calibration / account for loss during calibration

 

¿ªÔÆÌåÓý

When you do the cal, you should have the pad in the system, that is, the source drives the pad, then to the 8970 input. You will use the ENR values you have for the source. Your DUT will go between the source and the pad after you perform the cal, and you should get correct values.

?

Since you corrected for the pad with your R&S test, I would expect you would get good results if you corrected for the pad both during cal and the DUT measurement, but that is a more work than needed. The cal process corrects for all the losses or gains in the signal path so that when you measure your DUT, that is already taken into account. The NFA does all the work.

?

Again, SP 34 should not be needed.

?

From: [email protected] <[email protected]> On Behalf Of Marc73
Sent: Friday, February 18, 2022 12:58 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 8970B calibration / account for loss during calibration #141-66513

?

Hi thanks for your reply. Of course I would like to measure 75Ohm devices. So I'd have to enter the thrue ENR of the noise source in 75Ohm system inluding the matching pad and do calibration. Afterwards wehn I do the measurements I don't have to account for the matching pad as well? The it would be very easy. BTW the 75Ohm noise source has an ENR is around 7,5dB. (I have the whole table between 50MHz and 1GHz in 50MHz steps)

I used to these measurements with an R&S FSU8 + FSK-30 option and there in included the loss of the matching pad during cal and measurement and I got correct results, that's why I wonder right now with the 8970B.

HP 8970B noisy fan

 

I have an older HP 8970B which is however in good condition. Just one thing is annoying, the fan is very noisy and makes a loud squeaking noise. I guess the bearing has become bad.

As this fan is 115V (even though the insrument is used with 230V) it's not that easy to get such a fan replacement in Europe. Has anyone some advice how to get the fan quiet? Some oil at the right position? So far I did't tear down the fan as I don't want to berak it...
Re: HP 8970B calibration / account for loss during calibration

 

Hi thanks for your reply. Of course I would like to measure 75Ohm devices. So I'd have to enter the thrue ENR of the noise source in 75Ohm system inluding the matching pad and do calibration. Afterwards wehn I do the measurements I don't have to account for the matching pad as well? The it would be very easy. BTW the 75Ohm noise source has an ENR is around 7,5dB. (I have the whole table between 50MHz and 1GHz in 50MHz steps)

I used to these measurements with an R&S FSU8 + FSK-30 option and there in included the loss of the matching pad during cal and measurement and I got correct results, that's why I wonder right now with the 8970B.
Re: Agilent 44xx ESG RF Generator question

 

I really appreciate all of the feedback!

Looking through HP/Agilent offerings it appears the 8846A may be the most reasonably priced / not ancient and needing repair model which does phase continuous sweeps I could find.? Anyone have one in good shape they are looking to part with for a reasonable price?

Thank you!
Howard Hoyt / WA4PSC
Re: 8350B *restoration adventure?*

 

¿ªÔÆÌåÓý

Hello Ruben,

?

for your question, you have to think about the main purpose of this purchase; did you intend to buy a plugin and what frequency range, or just to repair and resell? If it's to resell (without a plugin), I don't think the effort is worth it.

If you really intended to buy a plugin, then you have several choices, you buy a new 8350B with the plugin included and sell the one you have, or you buy a plugin and repair with or without modification, the 8350B.

?

You say that the transformer is unrepairable mainly because of corrosion, because the burnt wires are replaceable.

So, if this is really the case, you will have to modify the 8350B to insert the 8566 transformer, or find a really compatible or original transformer for the 8350B.

?

By chance, today, in exchange of a piece of equipment I was not using, I received an 8350B and an 83595A module.? The 8350B has several problems so part of the front panel is not working, and the 83595A needs to be checked and adjusted completely.

So, like you, I will work on restoring an 8350B...however the problems are less severe.

?

Whatever you decide, I wish you the best of luck.

?

-Yves

?

De?: [email protected] <[email protected]> De la part de RubenRubio
·¡²Ô±¹´Ç²â¨¦?: 17 f¨¦vrier 2022 17:07
??: [email protected]
Objet?: Re: [HP-Agilent-Keysight-equipment] 8350B *restoration adventure?*

?

Hello

Thanks for the idea Yves, I thought that at first, but the original transformer is totally burned and has 4 windings in dead short between them. Also the varnish, wax paper layers and corrosion of the iron core makes the rewind task imposible. That was the reason to buy another transformer. The wrong transformer :D

Today I did supplies adjustments, all need tuning and the -40 was the only one that I couldn't adjust due to the lack of 40 millivolts,?I suppose that due to the imperfection of the connections or tiny differences on input voltages. The built-in test still says power supplies are ok (no error 004). Also adjust the 10 volt DAC reference.?

?- Current draw on the 20-0-20 secondary (which feed both 5 volt rails, 5VA and 5VB) is 4.3 at start and then 3.8 A continuous.?
?- Consumption on the rest of the rails are under 0.5 amp, probably due to the lack of plugin.

Now I feel discouraged... don't know if spend money in a plugin or abandon project

If anyone has an idea or advice, I'm open?

To be continued...

Ruben
Re: HP8903B - Plotting from HP-IB

 

From memory, all of Pete's software is VEE based so it expects a VISA supported GPIB adapter.

The Prologix is a great little adapter but isn't VISA supported, I think you'll need to get a HPAK or NI one to get it to work.

TonyG?
Re: Selling experience, sorry OT again

 

I don't see any suggestions for an alternative to Ebay, except test-equip-trader which I suggested. It seems to work.
What about Paypal? I have been finding my account very confusing to interpret.
I tried to read their fees on their site.?
Then I phoned them (Paypal) with a very simple question "If someone in the USA sends me $50 Canadian how much will I actually get"
That caused a tizzy and the supervisor had to be consulted. The bottom line was "it depends". There are all sorts of fees depending on how it is invoiced and sent.
I still don't know so I'm glad I didn't try to go through their "Fees" link and spend hours on it. $48 was mentioned but there might be....? (transaction fees, international fees plus a fixed fee)
It used to be that I never bothered seeing what I got. Ebay and Paypal deserved 5 to 10%. Now Ebay takes 20% (OK 19.3%) and I don't know what Paypal takes. I get weekly updates to changes in the Ebay and Paypal contracts that I don't understand but I guess are designed to screw an honest person.
This is really not the purpose of this group so please don't flood with messages unless you actually know what the charges are or an alternative to Paypal. We get the message about Ebay that until something else comes along it is still convenient but now very expensive. Lets put the Ebay issue to rest.
I sold something for $50 to someone in the USA and he is sending $50 Canadian by Paypal. I will let you know how much I actually get and how fast (I saw something about holds while on the Paypal site, more games?).
Re: Power meter E4416A problem power on

 

Thanks for your reply.
what problem with this keypad?? my power meter a month ago it works well I was on vacation when I came back I turn it on the orange button lights up but when I press the on button nothing happens.


Le jeu. 17 f¨¦vr. 2022 ¨¤ 22:38, Richard Parrish <Richard@...> a ¨¦crit?:
You're going to have to replace the keypad assembly, this is a very common problem in all the new series of instruments and the E19xx series of meters.
Price isn't too bad and you can find them for much less on Ebay.
Richard

From: [email protected] <[email protected]> on behalf of Mohamed Atif via <mohammedatif1968=[email protected]>
Sent: Thursday, February 17, 2022 2:25 PM
To: [email protected] <[email protected]>
Subject: [HP-Agilent-Keysight-equipment] Power meter E4416A problem power on
?
Hello,
I have agilent E4416A series power meter. the voltages are ok 12v,-12v, 5v and the battery measures 2.9v the stand by light is on but when I press the power button nothing happens you can help me and thank you in advance.
Best regards
Re: HP 83206A TDMA Cellular Adapter

 

No good use I hnow for, besides disassembling and using the very high quality rf parts inside

Enviado do meu Tele-Movel

Em qui, 17 de fev de 2022 19:27, Tony Goodhew <tony_goodhew@...> escreveu:

Hey All,

I just took ownership of an 8920B and it came with the 83206A TDMA Adapter.

Can anyone suggest a use for this other than e-waste or reclamation? As far as I can tell it seems to be pretty specific to 2G cell equipment so there doesn't seem to be any hobbyist uses for it.

Just wondering if I should keep it or dump it?

Thanks,

TonyG

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