Re: Tek 475A with ringing noise on all voltages
Take some video and show us on utube a sample.
?
Do you hear any sound that is associated with the noise?
?
Try it on a different outlet in a different room?
?
?
?
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----- Original Message -----
Sent: Friday, October 26, 2012 10:44
AM
Subject: [TekScopes] Tek 475A with
ringing noise on all voltages
?
Hi Guys,
After repairing a friend's Tek 475A with a 15v problem, I ran
into something strange. When the sweep control is in the NORM trigger mode, I
occasionally see an unexpected trace on the screen. I hung a probe on each
voltage rail and discovered a .05V HF quick decaying AC on all rails occurring
about once every 5 seconds. All internal covers and shielding is in place and
there is no apparent arcing visible in the CRT. The ringing seems to be about
80Mhz & 15 cycles long. (Looks like a ignition spark) trigger mode. Only
happens on this scope and no abnormal police/flasher/radio in the
area.
Anyone encounter this symptom and find anything?
Thanks in
advance,
Warren Guinn
|
Tek 475A with ringing noise on all voltages
Hi Guys,
After repairing a friend's Tek 475A with a 15v problem, I ran into something strange. When the sweep control is in the NORM trigger mode, I occasionally see an unexpected trace on the screen. I hung a probe on each voltage rail and discovered a .05V HF quick decaying AC on all rails occurring about once every 5 seconds. All internal covers and shielding is in place and there is no apparent arcing visible in the CRT. The ringing seems to be about 80Mhz & 15 cycles long. (Looks like a ignition spark) trigger mode. Only happens on this scope and no abnormal police/flasher/radio in the area.
Anyone encounter this symptom and find anything?
Thanks in advance,
Warren Guinn
|
Re: Screwdriver for Pozidriv (Pozi) Screws used by Tek
Am I missing something? I looked at all my plastic blocks of driver tip sets and most have PZ tips. One set that I use everyday which picked up in Taiwan has PZ0,1,2,3.
--Victor
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Re: Estate sale scopes...
You can't take it with you, so we ought to enjoy those things that
give us pleasure while we are able to.
Ron
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On 10/25/12, Miroslav Pokorni <mpokorni@...> wrote: Well put Laura,
But most us do not heed the warning.
Miroslav Pokorni
On 10/24/2012 9:20 PM, Laura Tighe wrote:
This should be a lesson. You can't take it with you.
Laura
two bids already ( although could be a tube scrounger at that price)
Dave
On 10/24/2012 8:59 AM, Craig Sawyers wrote:
Not my auction:
. com/itm/19074405 4939
<>
SWMBO would kill be if I even bid, let alone won it ...
Yeah - me too. I'm under increasing pressure to downsize, let alone buy
that lot.
Please someone do - I'd hate them to go into recycling.
Craig
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Purchasing Caps? Preferred vendors?
As I am now involved in a rebuild of a Tek 310. Where/what is our preferred vendor for the purchase of caps, resistors, etc?
?
?? All The Best, Rich
D.
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565 with 3a9 plugins on eBay- Kirkland WA
No affiliation with seller, just thought someone might be interested:
If I lived close to there, I certainly would snatch it up! Shipping is $60 +...
Keith Ostertag
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Re: Screwdriver for Pozidriv (Pozi) Screws used by Tek
I know that.
But none of the big reputable suppliers see a need to make them, and the Japanese suppliers don't seem to know them either.
I'm not sure if this isn't just a myth, with a handful of sources catering to those few that believe it.
ST
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On Fri, Oct 26, 2012 at 1:33 PM, James R. Bartlett <james.r.bart@...> wrote:
Google them, They are available from US suppliers
Jim
Ei2BB
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Re: Screwdriver for Pozidriv (Pozi) Screws used by Tek
Another use for Pozidriv #2 is to remove the screws that secure the top and bottom panels of most HP test equipment.
Patrick Wong AK6C
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--- In TekScopes@..., "Albert" <aodiversen@...> wrote:
Sure sooner or later (probably sooner!) you will need that #2 as well. For instance, try to remove the PS unit from a 7000 'scope. Or the plastic rear panel from a plugin.
Usually the boards and components (like attenuator houses and shields) are mounted with #1 screws. But then, the relay board in a PG506 is mounted with #2.
And... the feet of my 465 require #2, not #1.
Albert
--- I had a 465 apart on the bench and I tried
the #1 screwdriver on every screw I saw on the 465 and it was the correct
size. The #2 screwdriver did not fit anything on the 465, nor did it seem
like a #0 screwdriver would be useful. I think the 7000 scopes have some
larger screws that might require the #2 Pozidriv, but that remains to be
seen.
tom jobe...
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Re: Screwdriver for Pozidriv (Pozi) Screws used by Tek
Google them, They are available from US suppliers
Jim
Ei2BB
?
I think they should exist (different geometry) but have never found one - any members in Japan?
Regards,
David Partridge
Subject: Re: [TekScopes] Re: Screwdriver for Pozidriv (Pozi) Screws used by Tek
Now that that's sorted, anyone willing to find out if there really is such a thing as a JIS screwdriver that is different to a philips?
ST
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Re: Rise time check of 067-0587-02, Signal Pickoff via rigid extender?
On Thu, 25 Oct 2012 13:02:52 +0100, "Craig Sawyers" <c.sawyers@...> wrote: My S-4 samplers sure do although I hear the S-6 samplers are better. I am still
working through the details of calibrating my 7S11/S-4 plug-ins to see how
bad the samplers are.
As far as I know, the blow-by is only a problem about 10ns after a fast edge
so it will not be a problem in this case.
On Thu, 25 Oct 2012 02:45:00 -0700, Miroslav Pokorni <mpokorni@...>
wrote:
I was told that S-6 has a big blow-by and caution is advised when
blaming device under test for bad signal. Let's not forget that the S4 was introduced in 1969 - 43 years ago. It was
$795.
The S6 came in in 1971 - 41 years ago, costing $875.
These correspond to around $10,000 in today's money.
That we are still using these 14GHz sampling heads now says something for a
technology design that is rooted in the 1960's, to its ruggedness, and its
raw capability. And we pay buttons for them.
So let's not get too snitty about "how bad the samplers are".
Craig
Maybe I should have said, "how bad the settling time up to 25ns of the two S-4 samplers that I have is compared to other S-4 and S-6 samplers". Mine are not noisy and do not drift but as others have noticed, in general the under 25ns settling time response of the S-4 does not compare well to its contemporary peers and is often a problem. If anybody has suggestions for improving the S-4 settling time, I am all ears. My current plan is to use S-2 samplers instead.
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Re: 7000 series on-screen displays boards
It looks like it would be very difficult to substitute one for the
other as well. The 7834 has the row and column data switches on the
main interface board so the readout circuits are effectively on two
different boards connected by an additional pair of coaxial cables. I
should have noticed that since my 7834 is still partially
disassembled.
So, you definitely cannot use the 7704 (it has a very different
layout) or 7834 readout boards. If you check the readout board
schematic or layout for the specific oscilloscope, at least the
difference is readily apparent.
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On Fri, 26 Oct 2012 04:33:45 +0000 (UTC), d.seiter@... wrote: I looked one of the x-refs I have, and it lists the same RO board number for most 7K scopes,?with the exception of the 7704 (non-A), and the 7834.? I'm pretty sure that primary PCB?had at least one major ?layout change in it's many revisions,?because I recall?checking dissimilar boards to ensure the part numbers matched.
-Dave?
----- Original Message -----
From: "David" <davidwhess@...>
To: TekScopes@...
Sent: Thursday, October 25, 2012 6:20:29 AM
Subject: Re: [TekScopes] 7000 series on-screen displays boards
As far as I know, all of the 7000 series readout boards are
interchangeable. There was a late model readout board that used a
different design in the 7623B or 7633 but I suspect it will work as
well.
You might need to make or extend the coaxial lines and ribbon cables
if they are not long enough or even present. The frequencies involved
are not high so RG-174/RG-178 size coaxial cable will be more than
adequate as a replacement for the coaxial cable Tektronix used.
The N suffix plug-ins just lack the readout signal circuits. They
will work fine but will not generate a readout. Usually this was an
option but some plug-ins like the 7CT1N curve tracer never had readout
circuitry.
On Wed, 24 Oct 2012 23:53:22 -0400, Michael Dunn < md@... >
wrote:
My 7613 has no OSD board. Can these be found, and retrofitted?
Would a 7844 use the same board?
And do some plugins not work with that? (N suffix???)
thanks
Michael
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Re: Screwdriver for Pozidriv (Pozi) Screws used by Tek
This is true for the shaft diameter, but due to the difference in profile a pozidrive 1 will most often be confused with a philips 2 and vice-versa. The pozidriv 2 will not engage a philips size 2 screw. So you'll most likely want to look at one size smaller than you are used to for philips. ST On Fri, Oct 26, 2012 at 11:05 AM, David C. Partridge <david.partridge@...> wrote: Pozidriv screwdrivers are the same size as Philips screwdrivers, just the bit geometry differs. #000 through to #4, though normally you'll only see #1 to #4.
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Re: Screwdriver for Pozidriv (Pozi) Screws used by Tek
I think they should exist (different geometry) but have never found one - any members in Japan?
Regards,
David Partridge
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-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Stefan Trethan
Sent: 26 October 2012 09:13
To: TekScopes@...
Subject: Re: [TekScopes] Re: Screwdriver for Pozidriv (Pozi) Screws used by Tek
Now that that's sorted, anyone willing to find out if there really is such a thing as a JIS screwdriver that is different to a philips?
ST
|
Re: Screwdriver for Pozidriv (Pozi) Screws used by Tek
Pozidriv screwdrivers are the same size as Philips screwdrivers, just the bit geometry differs. #000 through to #4, though normally you'll only see #1 to #4.
Most Tektronix equipment use #1 and #2, though I have encountered #0 as well.
Dave
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-----Original Message----- From: TekScopes@... [mailto:TekScopes@...] On Behalf Of David DiGiacomo Sent: 26 October 2012 03:47 To: TekScopes@... Subject: Re: [TekScopes] Screwdriver for Pozidriv (Pozi) Screws used by Tek I paid $2.00 + $2.25 shipping for one on Ebay. Now I'm kicking myself for waiting so long. This is definitely worth it. The one I bought (I have no affiliation with the seller) is called "GearWrench 80084 #1 x 3-1/8" Pozi Insulated Screwdriver". The seller has 362 of them at this 'Buy It Now' price so he is not likely to run out any time soon. For people who bought these, is #1 the right size, or do I need #2? How about #0? ------------------------------------ Yahoo! Groups Links
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Re: Screwdriver for Pozidriv (Pozi) Screws used by Tek
Now that that's sorted, anyone willing to find out if there really is
such a thing as a JIS screwdriver that is different to a philips?
ST
|
Re: Screwdriver for Pozidriv (Pozi) Screws used by Tek
Sure sooner or later (probably sooner!) you will need that #2 as well. For instance, try to remove the PS unit from a 7000 'scope. Or the plastic rear panel from a plugin.
Usually the boards and components (like attenuator houses and shields) are mounted with #1 screws. But then, the relay board in a PG506 is mounted with #2.
And... the feet of my 465 require #2, not #1.
Albert
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Show quoted text
--- I had a 465 apart on the bench and I tried
the #1 screwdriver on every screw I saw on the 465 and it was the correct
size. The #2 screwdriver did not fit anything on the 465, nor did it seem
like a #0 screwdriver would be useful. I think the 7000 scopes have some
larger screws that might require the #2 Pozidriv, but that remains to be
seen.
tom jobe...
|
Re: Screwdriver for Pozidriv (Pozi) Screws used by Tek
I find that Pozidriv #1 fits all the Pozidriv screws in my Tek, HP and Racal equipment. I do have Pozidriv #0 for use on some microscopes and I have the larger Pozidriv drivers though I have never seen screws they fit, perhaps because I don't do things in wood. I gave a brief presentation comparing Pozidriv and Phillips screws and drivers to my local home shop machinist club. Since few of the members there do much with electronics, no one was familiar with Pozidriv. Most of us complain about the difficulty of loosening really tight Phillips head screws because the driver cams out of the head. True. In fact this "feature" was designed into the Phillips head as an early attempt to limit torque from automatic screwdrivers; the plan was to force the driver to cam out and disengage the head when high torque was reached, before the driver sheared off the screw head. So, the difficulty of keeping a Phillips driver from slipping was deliberate in the Phillips head design. Pozidriv is far less prone to cam out of the Pozidriv heads. Torx, of course, is better, but developed later. Attached is a brief pdf comparing the features of Pozidriv and Phillips. Larry On 10/25/2012 8:04 PM, Tom Jobe wrote: After reading about the virtues of Pozidriv on Tekscopes, I ordered some of
the #1 Pozidriv screw drivers from your eBay vendor, as well as some #2
Pozidriv screwdrivers from another vendor.... I must say that the Pozidriv scheme seems like what we should have on
everything that uses an X type of fastener. The torque you apply does not
try to force the screwdriver out of the screw head like it does with the
Phillips arrangement. ... -- Best wishes, Larry McDavid W6FUB Anaheim, California (SE of Los Angeles, near Disneyland)
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Re: 7000 series on-screen displays boards
I looked one of the x-refs I have, and it lists the same RO board number for most 7K scopes,?with the exception of the 7704 (non-A), and the 7834.? I'm pretty sure that primary PCB?had at least one major?layout change in it's many revisions,?because I recall?checking dissimilar boards to ensure the part numbers matched.
?
-Dave?
From: "David" To: TekScopes@... Sent: Thursday, October 25, 2012 6:20:29 AM Subject: Re: [TekScopes] 7000 series on-screen displays boards
?
As far as I know, all of the 7000 series readout boards are
interchangeable. There was a late model readout board that used a
different design in the 7623B or 7633 but I suspect it will work as
well.
You might need to make or extend the coaxial lines and ribbon cables
if they are not long enough or even present. The frequencies involved
are not high so RG-174/RG-178 size coaxial cable will be more than
adequate as a replacement for the coaxial cable Tektronix used.
The N suffix plug-ins just lack the readout signal circuits. They
will work fine but will not generate a readout. Usually this was an
option but some plug-ins like the 7CT1N curve tracer never had readout
circuitry.
On Wed, 24 Oct 2012 23:53:22 -0400, Michael Dunn <md@...>
wrote:
> My 7613 has no OSD board. Can these be found, and retrofitted?
>
> Would a 7844 use the same board?
>
> And do some plugins not work with that? (N suffix???)
>
>thanks
>Michael
|
Re: Screwdriver for Pozidriv (Pozi) Screws used by Tek
I also got the $10 HF security set last weekend. ?I've been meaning to get a Pozi set for a long time, but single drivers were always $$$ if you could find them. ?I got a tool catalog from one of the electronic specialty houses a few weeks ago, and it only had Pozi bits as part of a larger set. ?
I really don't like the quality of most Harbor Freight items, but when I just need a quick and dirty solution, it's cheaper/quicker than other local stores. ?In this case, the case smelled nasty, but after a week of outgassing in the car it's ok. ?The case also doesn't stay closed, but you get what you pay for...
Years ago I bought a small grinder/buffer from them because I needed a small unit with adjustable speed. ?The problem was that placing anything more than a tiny load on the motor caused it to slow down a great deal. ?Still, it worked for what I needed it for.
-Dave
From: "Tom Jobe"
To: TekScopes@...
Sent: Thursday, October 25, 2012 8:04:33 PM
Subject: Re: [TekScopes] Screwdriver for Pozidriv (Pozi) Screws used by Tek
After reading about the virtues of Pozidriv on Tekscopes, I ordered some of
the #1 Pozidriv screw drivers from your eBay vendor, as well as some #2
Pozidriv screwdrivers from another vendor. They all arrived promptly, and I
was thoroughly impressed with how well the right tool fits and works with
the original Tektronix screws. I had a 465 apart on the bench and I tried
the #1 screwdriver on every screw I saw on the 465 and it was the correct
size. The #2 screwdriver did not fit anything on the 465, nor did it seem
like a #0 screwdriver would be useful. I think the 7000 scopes have some
larger screws that might require the #2 Pozidriv, but that remains to be
seen.
I must say that the Pozidriv scheme seems like what we should have on
everything that uses an X type of fastener. The torque you apply does not
try to force the screwdriver out of the screw head like it does with the
Phillips arrangement.
tom jobe...
PS Thanks everyone for the Pozidriv enlightenment!
----- Original Message -----
From: "David DiGiacomo"
To:
Sent: Thursday, October 25, 2012 7:47 PM
Subject: Re: [TekScopes] Screwdriver for Pozidriv (Pozi) Screws used by Tek
> I paid $2.00 + $2.25 shipping for one on Ebay. Now I¡¯m kicking myself for
> waiting so long. This is definitely worth it. The one I bought (I have no
> affiliation with the seller) is called ¡°GearWrench 80084 #1 x 3-1/8" Pozi
> Insulated Screwdriver¡±. The seller has 362 of them at this ¡®Buy It Now¡¯
> price so he is not likely to run out any time soon.
For people who bought these, is #1 the right size, or do I need #2?
How about #0?
------------------------------------
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Re: Estate sale scopes...
I think a larger plane, like a 747, would make a great house. ?I also like the idea of a tripod, so you can level the house if needed.?
-Dave
From: "Alexandre Souza - Listas" To: TekScopes@... Sent: Thursday, October 25, 2012 5:56:56 PM Subject: Re: [TekScopes] Re: Estate sale scopes...
?
Crazy people... :oD
---
Enviado do meu Motorola PT550
Meu site:
----- Original Message -----
From: "Craig Sawyers" <c.sawyers@...>
To: <TekScopes@...>
Sent: Thursday, October 25, 2012 3:18 PM
Subject: RE: [TekScopes] Re: Estate sale scopes...
>> You made us look very hard for the Tek connection:
>>
>> <>
>> <>
>> <>
>> <>
>> <>
>
> I can just see it now. "I've bought a plane, dear" "You've done WHAT??"
> "Yes - the good news is that it'll double up as a storage facility for the
> test gear collection"
>
> Craig
>
>
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David Hess
David C. Partridge