Re: HP 8341A sucessfully FIXED!
Hi Tobias,
Great job and a great write-up to go with it, thanks for sharing your work.
Your story reminded me of something I learned from my first ever boss after I left school (over 50 years ago now - yikes!) he was an electronics engineer in the Radio Astronomy group at Cambridge and whenever we had to fix things that looked like they were 'no user serviceable parts inside' he would pick up a screwdriver, wrench or whatever and say "Well now, it didn't grow like that did it?" and would start taking it apart and more often than not he would fix it! I have followed that approach myself over the years and generally succeeded more often than failed too - and even when I fail I learn something!
Congratulations again on that fix!
Regards, Adrian
On Sunday, October 15, 2017 2:30 PM, "Tobias Pluess tobias.pluess@... [hp_agilent_equipment]" wrote:
?
Hi all,
probably some of you have seen that I had some problems with a 8341A. It was indeed the YTO which failed! But, I was incredibly lucky to fix the YTO.
I also did a front panel RF output retrofit on my machine.
Some pics of the YTO and stuff can be found on my page, if someone is interested :-)
Now I can proceed to my next project, a 5342A frequency counter (hopefully not a blown sampler) and a 8568B spectrum analyzer with blurry focus on the graticule.
Best
Tobias, HB9FSX
|
Re: HP 60’s Front Panel Color
Hi, I'm not sure there is an exact match in the RAL pallet. The nearest I have found for instruments of that vintage is RAL7042. That looks ok for panels that I wanted to 'tone in' with the HP equipment but it is probably not close enough to invisibly touch-up parts of an existing original panel. I have not explored it yet, but I gather there are now companies around who will colour (or color!) match from a sample and then mix an exact match for you. Some will do this in modest volume and for a reasonable cost, or so I am told!
Adrian
On Sunday, October 15, 2017 5:41 PM, "mmaseda@... [hp_agilent_equipment]" wrote:
?
Can some please share with me the paint code used by HP for front panels in the 60’s? ?I have a very early 410C I’m trying to redo. ?The color is more dark than the RAL7044 used on the later 410C meters.
|
Hi guys. Over the years I have read a lot about yigs going bad specifically their coils seem to go bad. Is there anything that can be done pre-emptively to secure their longevity? And what exactly happens? Do the coils open due to excessive
current (like a fuse?) I know there is an issue where the sphere sometimes moves and gets located incorrectly IIRC. I don’t know what causes that, perhaps excessive force? But I am interested in the coil issue. I have no yig issues at the moment, which seems
like a good time to try to prevent it?
?
Eugene W2HX
?
|
Re: Restoring HP 1740A scope, strange waveforms seen, assistance please?
I am not familiar with that model (I have a 1727A) but if it is anything close to the Tektronix 465, there are attenuator switches operated from the panel control that may be making poor contact.
I must get into my 465 to make such a repair.? I have a spare 465B and hope that one has the parts I need.
Bob
On Sunday, October 15, 2017 6:05 AM, "dadhills@... [hp_agilent_equipment]" <hp_agilent_equipment@...> wrote:
The signal is being differentiated, as if it is being coupled
through a small value capacitor.? I would first look at the
attenuator switch contacts on those particular v/div settings for an
open or high resistance.? In other words dirty switch contacts.
Dave
Hi all, I've been a member for a while but lurking in the
background while working on the scope and looking out for any
discussions about a 1740A taking place.
I now have the scope in a running condition after
replacing 2 faulty transistors and now while testing the scope
with the 1V test connection I discover that channel B works as
expected but channel A works OK up to 0.2V on the volts/div
switch, moving to 0.5V and upwards the trace goes odd.?
I was wondering if anyone could point me to the area that
I need to be looking at on channel A to cure the problem. I
have uploaded photos of? both channels with the settings on
0.5V and 1V so you can see the problem?
[url=][img][/img][/url][url=]B
channel 1V dc[/url] by
[url=]Graham
Butcher[/url], on Flickr
[url=][img][/img][/url][url=]B
channel 0.5V DC[/url] by
[url=]Graham
Butcher[/url], on Flickr
[url=][img][/img][/url][url=]A
channel 1V DC[/url] by
[url=]Graham
Butcher[/url], on Flickr
[url=][img][/img][/url][url=]A
channel 0.5V DC[/url] by
[url=]Graham
Butcher[/url], on Flickr
Thanks in advance for any help you can offer me.
Graham
|
HP 60’s Front Panel Color
Can some please share with me the paint code used by HP for front panels in the 60’s? ?I have a very early 410C I’m trying to redo. ?The color is more dark than the RAL7044 used on the later 410C meters.
|
Re: HP 8341A sucessfully FIXED!
Hi Ed
many thanks! Yes, I was really lucky with my YTO. However, I am a bit afraid that the YTO could definitely fail some day and I would like to have a spare, but there's none :-( I even thought whether it would be possible to construct a semiconductor-based,
compatible replacement, but this would be a really large and complex project. I have some ideas, though :-)
Of course my web page will be kept online. I have several projects I am working on, including a 5342A microwave counter and a 8568B spectrum analyzer, both waiting for repair. I will also present these on my page.
I would like to upload my the pics of the YTO, however, I forgot how that works; I probably even have an account here, but I have no idea what credentials I used. This is because posting to the group also works even if you forgot your account details :-)
I will try to figure things out and upload the pictures!
Best
Tobias
toggle quoted message
Show quoted text
-------- Original message --------
From: "edbreya@... [hp_agilent_equipment]"
Date: 10/15/17 17:19 (GMT+01:00)
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment] Re: HP 8341A sucessfully FIXED!
?
Wow. Nice work, Tobias. Sometimes we learn the most when things seem hopeless. Your reasoning was right that there was nothing to lose by taking a chance on opening the YTO, and you came up with a great alternative to get around the problem.
I hope you plan to keep that web-page available - it's a good story and resource with good pix of the YTO innards, for future reference. I'd recommend you also post the images to the photos department here.
Ed
|
Hi all
I have a 8568B spectrum analyzer which has some strange flickering traces sometimes. I found out that the traces do not flicker if the frequency span is narrow, for instance 1 MHz. As soon as I use a wider span, the traces are kind of unstable.
I then opened the RF section and found following behaviour: with a large span, the YTO unlocked LED flashes sometimes, however, I get no YTO warning on the screen.
If I lower the span to 1 MHz or less, the YTO unlocked LED is off all the time and the traces on the screen are nice and stable.
Is it normal that, when larger spans are used, the YTO unlocks from time to time? If not, why don't I get the YTO unlock message on the screen?
Tobias, HB9FSX
|
I too expected that electronics
professionals and hobbyists would be above that sort of nonsense
and would refrain not only from indulging in conspiracy theories
and political rants, but also from posting them in electronics
groups/forums.
Unfortunately I was unpleasantly surprised by the postings in
sci.electronics.design, and it appears some people would like that
to spread to here.
Would everybody please discuss anything resembling politics and
conspiracy theories elsewhere.
Enough said, I fervently hope.
On 15/10/17 16:37, George Onufer amatec@...
[hp_agilent_equipment] wrote:
toggle quoted message
Show quoted text
?
Dan, I
certainly agree that this is not the forum in any sense
for a political debate.? Unfortunately you went on to
engage in exactly that.?
"The Media"
has destroyed its own worthiness and doesn't need
anyone's help.
George
On
Sunday, October 15, 2017 7:16 AM, "Dan Nelson
blaze_1024@... [hp_agilent_equipment]"
wrote:
?
I
have family?living in Sonoma as well
and don't really appreciate the
directing this conversation has
taken, As a retired LEO I have a
real issue with people who attack
the guardians of our first amendment
rights. The media has generally done
more to protect our first amendment
rights than all wars combined. And I
don't say that lightly as both my
son's are in the military. My oldest
is a Seal and my youngest just
graduated from Army Ranger school?at
Fort Benning.?
?Attacking the media has always been
a popular pastime for certain groups
especially conspiracy theorists,
Unfortunately, it has graduated to a
form of Alt-Right political
correctness.? I never thought I
would see the day that a news
organization?would be relentlessly
attacked and labeled?"Fake News" for
directly quoting something someone
said on live?TV.?
I always thought electronics
professionals, as well as hobbyist,
were above that sort of nonsense, As
such the last place I expected to
see this sort of nonsense is here on
this forum.?
Best Regards?
D. Nelson?
|
>>> "The Media" has destroyed its own worthiness and doesn't need anyone's help.
It's a sad reflection on current circumstances that this is itself nearly a political statement.
Dan, I certainly agree that this is not the forum in any sense for a political debate.? Unfortunately you went on to engage in exactly that.?
"The Media" has destroyed its own worthiness and doesn't need anyone's help.
George
?
I have family?living in Sonoma as well and don't really appreciate the directing this conversation has taken, As a retired LEO I have a real issue with people who attack the guardians of our first amendment rights. The media has generally done more to protect our first amendment rights than all wars combined. And I don't say that lightly as both my son's are in the military. My oldest is a Seal and my youngest just graduated from Army Ranger school?at Fort Benning.?
?Attacking the media has always been a popular pastime for certain groups especially conspiracy theorists, Unfortunately, it has graduated to a form of Alt-Right political correctness.? I never thought I would see the day that a news organization?would be relentlessly attacked and labeled?"Fake News" for directly quoting something someone said on live?TV.?
I always thought electronics professionals, as well as hobbyist, were above that sort of nonsense, As such the last place I expected to see this sort of nonsense is here on this forum.?
Best Regards?
D. Nelson?? ?
|
Dan, I certainly agree that this is not the forum in any sense for a political debate.? Unfortunately you went on to engage in exactly that.?
"The Media" has destroyed its own worthiness and doesn't need anyone's help.
George
On Sunday, October 15, 2017 7:16 AM, "Dan Nelson blaze_1024@... [hp_agilent_equipment]" wrote:
?
I have family?living in Sonoma as well and don't really appreciate the directing this conversation has taken, As a retired LEO I have a real issue with people who attack the guardians of our first amendment rights. The media has generally done more to protect our first amendment rights than all wars combined. And I don't say that lightly as both my son's are in the military. My oldest is a Seal and my youngest just graduated from Army Ranger school?at Fort Benning.?
?Attacking the media has always been a popular pastime for certain groups especially conspiracy theorists, Unfortunately, it has graduated to a form of Alt-Right political correctness.? I never thought I would see the day that a news organization?would be relentlessly attacked and labeled?"Fake News" for directly quoting something someone said on live?TV.?
I always thought electronics professionals, as well as hobbyist, were above that sort of nonsense, As such the last place I expected to see this sort of nonsense is here on this forum.?
Best Regards?
D. Nelson?? ?
|
Re: HP 8341A sucessfully FIXED!
Wow. Nice work, Tobias. Sometimes we learn the most when things seem hopeless. Your reasoning was right that there was nothing to lose by taking a chance on opening the YTO, and you came up with a great alternative to get around the problem.
I hope you plan to keep that web-page available - it's a good story and resource with good pix of the YTO innards, for future reference. I'd recommend you also post the images to the photos department here.
Ed
|
Greetings,
I have been reading some of the posts regrading the inaccurate reporting regarding the Keysight plant in Santa Rosa.
While I find inaccurate reporting as disturbing as most of us, I must also note that I am growing weary of this ongoing discussion.
I am taking the time to add to this conversation to suggest our efforts and energies might be put to better use if we can discover how we might help Keysight employees who have suffered loss as a result of these fires.
I know of at least one Keysight family who lost their home and possessions.
While it is reasonable to believe that most of the material losses will be covered by insurance there is, without question emotional loss and perhaps we can send some simple, yet supportive and encouraging gifts, to the Keysight campus for those
that suffered losses.
Regards,
Ken
toggle quoted message
Show quoted text
It was a commercial TV station. We pay for it, whenever we buy something sold by their sponsors. They are supposed to be professionals, not some hack, with a free blog. They just make things up,
rather than actually do their job of investigating the news before reporting it. I worked as a Broadcast Engineer and radio & TV stations. Shoddy work like this, is the main reason that I left that field. If I did my job as poorly as the 'News' the stations
would be off the air more than they were on.
-----Original Message-----
>From: "Peter Gottlieb?hpnpilot@...?[hp_agilent_equipment]" <hp_agilent_equipment@...>
>Sent: Oct 14, 2017 10:13 PM
>To:?hp_agilent_equipment@...
>Subject: Re: [hp_agilent_equipment] Re: Fake fire New
>
>Fake News is fiction, a lie, propaganda.? What is being described sounds more?
>like incompetence.? But of course there are a zillion "channels" now and many?
>fewer paying subscribers, so what do you expect in terms of quality?? How many?
>subscriptions do you pay for? Fewer and fewer people pay for their news sources?
>these days so quality will inevitably suffer.
>
>
>On 10/14/2017 8:29 PM, 'Michael A. Terrell'?mike.terrell@...?
>[hp_agilent_equipment] wrote:
>>
>> It's not like it was, 50 years ago when it would have taken 20 minutes (at?
>> most) to find out who the company is. Now a few seconds with a search engine?
>> would have told them who Keysight is. The difference between losing two?
>> portables and a couple vehicles vs losing the entire corporation is a huge?
>> error that a real journalist wouldn't have made.
>>
>> -----Original Message-----
>> >From: "Dan Nelson?blaze_1024@...?[hp_agilent_equipment]"?
>> <hp_agilent_equipment@...>
>> >Sent: Oct 14, 2017 6:46 PM
>> >To: "hp_agilent_equipment@..." <hp_agilent_equipment@...>
>> >Subject: [hp_agilent_equipment] Re: Fake fire New
>> >
>> >?Whats with the "Fake News" rhetoric. Using the term "Fake News" infers?
>> purposeful?deception which I highly doubt is the case. Reporters are humans?
>> and they do make mistakes. Also, not everyone?is an electronics nerd?
>> interested in $100,000 pieces?of test gear so It's not surprising that a?
>> normal person wouldn't know who Keysight is. How many electronics geeks?know?
>> who Beneteau is ??and yet they are worlds most highly regarded?builders of?
>> high-performance cruising and racing sailboats. By the way, a quick check if?
>> the USGS shows that there was indeed a small earthquake just outside Sonoma on?
>> the 14th.
>>
>> Michael A. Terrell
>>
>>?
>
Michael A. Terrell
|
HP 8341A sucessfully FIXED!
Hi all,
probably some of you have seen that I had some problems with a 8341A. It was indeed the YTO which failed! But, I was incredibly lucky to fix the YTO.
I also did a front panel RF output retrofit on my machine.
Some pics of the YTO and stuff can be found on my page, if someone is interested :-)
Now I can proceed to my next project, a 5342A frequency counter (hopefully not a blown sampler) and a 8568B spectrum analyzer with blurry focus on the graticule.
Best
Tobias, HB9FSX
|
Re: Restoring HP 1740A scope, strange waveforms seen, assistance please?
The signal is being differentiated, as if it is being coupled
through a small value capacitor.? I would first look at the
attenuator switch contacts on those particular v/div settings for an
open or high resistance.? In other words dirty switch contacts.
Dave
toggle quoted message
Show quoted text
Hi all, I've been a member for a while but lurking in the
background while working on the scope and looking out for any
discussions about a 1740A taking place.
I now have the scope in a running condition after
replacing 2 faulty transistors and now while testing the scope
with the 1V test connection I discover that channel B works as
expected but channel A works OK up to 0.2V on the volts/div
switch, moving to 0.5V and upwards the trace goes odd.?
I was wondering if anyone could point me to the area that
I need to be looking at on channel A to cure the problem. I
have uploaded photos of? both channels with the settings on
0.5V and 1V so you can see the problem?
[url=][img][/img][/url][url=]B
channel 1V dc[/url] by
[url=]Graham
Butcher[/url], on Flickr
[url=][img][/img][/url][url=]B
channel 0.5V DC[/url] by
[url=]Graham
Butcher[/url], on Flickr
[url=][img][/img][/url][url=]A
channel 1V DC[/url] by
[url=]Graham
Butcher[/url], on Flickr
[url=][img][/img][/url][url=]A
channel 0.5V DC[/url] by
[url=]Graham
Butcher[/url], on Flickr
Thanks in advance for any help you can offer me.
Graham
|
Restoring HP 1740A scope, strange waveforms seen, assistance please?
Hi all, I've been a member for a while but lurking in the background while working on the scope and looking out for any discussions about a 1740A taking place.
I now have the scope in a running condition after replacing 2 faulty transistors and now while testing the scope with the 1V test connection I discover that channel B works as expected but channel A works OK up to 0.2V on the volts/div switch, moving to 0.5V and upwards the trace goes odd.?
I was wondering if anyone could point me to the area that I need to be looking at on channel A to cure the problem. I have uploaded photos of? both channels with the settings on 0.5V and 1V so you can see the problem?
[url=https://flic.kr/p/ZpqZUY][img]https://farm5.staticflickr.com/4503/37677492692_c2c839b7dd_b.jpg[/img][/url][url=https://flic.kr/p/ZpqZUY]B channel 1V dc[/url] by [url=https://www.flickr.com/photos/158191416@N07/]Graham Butcher[/url], on Flickr
[url=https://flic.kr/p/Yr33kT][img]https://farm5.staticflickr.com/4471/37039289513_ec6ceee9c7_b.jpg[/img][/url][url=https://flic.kr/p/Yr33kT]B channel 0.5V DC[/url] by [url=https://www.flickr.com/photos/158191416@N07/]Graham Butcher[/url], on Flickr
[url=https://flic.kr/p/Yr33nM][img]https://farm5.staticflickr.com/4480/37039289623_04aa1256a5_b.jpg[/img][/url][url=https://flic.kr/p/Yr33nM]A channel 1V DC[/url] by [url=https://www.flickr.com/photos/158191416@N07/]Graham Butcher[/url], on Flickr
[url=https://flic.kr/p/Yr33qc][img]https://farm5.staticflickr.com/4446/37039289763_5022ed8666_b.jpg[/img][/url][url=https://flic.kr/p/Yr33qc]A channel 0.5V DC[/url] by [url=https://www.flickr.com/photos/158191416@N07/]Graham Butcher[/url], on Flickr
Thanks in advance for any help you can offer me.
Graham
|
The probe is spoken for - thanks...
geo
|
I have family?living in Sonoma as well and don't really appreciate the directing this conversation has taken, As a retired LEO I have a real issue with people who attack the guardians of our first amendment rights. The media has generally done more to protect our first amendment rights than all wars combined. And I don't say that lightly as both my son's are in the military. My oldest is a Seal and my youngest just graduated from Army Ranger school?at Fort Benning.?
?Attacking the media has always been a popular pastime for certain groups especially conspiracy theorists, Unfortunately, it has graduated to a form of Alt-Right political correctness.? I never thought I would see the day that a news organization?would be relentlessly attacked and labeled?"Fake News" for directly quoting something someone said on live?TV.?
I always thought electronics professionals, as well as hobbyist, were above that sort of nonsense, As such the last place I expected to see this sort of nonsense is here on this forum.?
Best Regards?
D. Nelson?? ?
|
Please please keep politics and conspiracy theory rhetoric away from this group.
If I want rants and abusive postings, I can find gobs of them on sci.electronics.design, surrounding a few technical gems. At least one of the (other) contributors to this thread can be found "over there".
Although it isn't directly relevant to this group, one of the good things
about working at HP was that any such statements would have been quickly
and effectively stamped on. That contributed to a pleasant working atmosphere.
|
I have friends in the areas affected by the fires that I haven't been able to contact. I am praying for them, and the others who are affected.
toggle quoted message
Show quoted text
-----Original Message----- From: "'Bill Lauchlan' bill.lauchlan171@... [hp_agilent_equipment]" <hp_agilent_equipment@...>
Sent: Oct 14, 2017 11:40 PM
To: hp_agilent_equipment@...
Subject: RE: [hp_agilent_equipment] Re: Fake fire New
This is not the time to have this type of discussion. Many of us either visited, worked there, and for my part at least, have gotten to know many people in Santa Rosa. Most are retired now and I think we should all be praying
they are all well. Regards Bill Lauchlan
From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sent: Saturday, October 14, 2017 10:14 PM
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] Re: Fake fire New
Fake News is fiction, a lie, propaganda. What is being described sounds more
like incompetence. But of course there are a zillion "channels" now and many
fewer paying subscribers, so what do you expect in terms of quality? How many
subscriptions do you pay for? Fewer and fewer people pay for their news sources
these days so quality will inevitably suffer.
On 10/14/2017 8:29 PM, 'Michael A. Terrell' mike.terrell@...
[hp_agilent_equipment] wrote:
It's not like it was, 50 years ago when it would have taken 20 minutes (at
most) to find out who the company is. Now a few seconds with a search engine
would have told them who Keysight is. The difference between losing two
portables and a couple vehicles vs losing the entire corporation is a huge
error that a real journalist wouldn't have made.
-----Original Message-----
From: "Dan Nelson blaze_1024@... [hp_agilent_equipment]" <hp_agilent_equipment@...>
Sent: Oct 14, 2017 6:46 PM
To: "hp_agilent_equipment@..." <hp_agilent_equipment@...>
Subject: [hp_agilent_equipment] Re: Fake fire New
Whats with the "Fake News" rhetoric. Using the term "Fake News" infers purposeful deception which I highly doubt is the case. Reporters are humans
and they do make mistakes. Also, not everyone is an electronics nerd
interested in $100,000 pieces of test gear so It's not surprising that a
normal person wouldn't know who Keysight is. How many electronics geeks know
who Beneteau is ? and yet they are worlds most highly regarded builders of
high-performance cruising and racing sailboats. By the way, a quick check if
the USGS shows that there was indeed a small earthquake just outside Sonoma on
the 14th.
Michael A. Terrell
Michael A. Terrell
|
It was a commercial TV station. We pay for it, whenever we buy something sold by their sponsors. They are supposed to be professionals, not some hack, with a free blog. They just make things up, rather than actually do their job of investigating the news before reporting it. I worked as a Broadcast Engineer and radio & TV stations. Shoddy work like this, is the main reason that I left that field. If I did my job as poorly as the 'News' the stations would be off the air more than they were on.
toggle quoted message
Show quoted text
-----Original Message----- From: "Peter Gottlieb hpnpilot@... [hp_agilent_equipment]" <hp_agilent_equipment@...>
Sent: Oct 14, 2017 10:13 PM
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] Re: Fake fire New
Fake News is fiction, a lie, propaganda.? What is being described sounds more
like incompetence.? But of course there are a zillion "channels" now and many
fewer paying subscribers, so what do you expect in terms of quality?? How many
subscriptions do you pay for? Fewer and fewer people pay for their news sources
these days so quality will inevitably suffer.
On 10/14/2017 8:29 PM, 'Michael A. Terrell' mike.terrell@...
[hp_agilent_equipment] wrote:
It's not like it was, 50 years ago when it would have taken 20 minutes (at
most) to find out who the company is. Now a few seconds with a search engine
would have told them who Keysight is. The difference between losing two
portables and a couple vehicles vs losing the entire corporation is a huge
error that a real journalist wouldn't have made.
-----Original Message-----
From: "Dan Nelson blaze_1024@... [hp_agilent_equipment]" <hp_agilent_equipment@...>
Sent: Oct 14, 2017 6:46 PM
To: "hp_agilent_equipment@..." <hp_agilent_equipment@...>
Subject: [hp_agilent_equipment] Re: Fake fire New
?Whats with the "Fake News" rhetoric. Using the term "Fake News" infers purposeful?deception which I highly doubt is the case. Reporters are humans
and they do make mistakes. Also, not everyone?is an electronics nerd
interested in $100,000 pieces?of test gear so It's not surprising that a
normal person wouldn't know who Keysight is. How many electronics geeks?know
who Beneteau is ??and yet they are worlds most highly regarded?builders of
high-performance cruising and racing sailboats. By the way, a quick check if
the USGS shows that there was indeed a small earthquake just outside Sonoma on
the 14th.
Michael A. Terrell
Michael A. Terrell
|
Michael A. Terrell