Date   

Re: Vintage HP Signal Generator Acquired

Brad Salai <bsalai@...>
 

I have a rack mount version. Mine benefited greatly from cleaning and lubing the frequency selecting dial mechanism. It is so smooth now that I occasionally turn the knob even when it is turned off.

Brad Salai
(585) 708-9235
@bsalai


Re: Vintage HP Signal Generator Acquired

David Holland
 

No specific exercises on a 200CD, as I've never had one...

But they're tube based, and with just about anything that old, I'd ESR
out the electrolytics and see if they need replacement, and replace
any paper caps on general principles.
(Presuming you don't see signs of it having already been done.)

David


On Sat, Feb 11, 2017 at 11:42 AM, David Berlind david@...
[TekScopes] <TekScopes@...> wrote:
Here is a photo of my latest acquisition that I'll be looking to use in
combination with my Tek 2220. The previous owner thinks it works but I
haven't hooked it up yet and I've just left on a business trip.

https://goo.gl/photos/GWj97ERYEtLPR2S56

Suggested "exercises" and other general thoughts are welcome.




------------------------------------
Posted by: David Berlind <david@...>
------------------------------------


------------------------------------

Yahoo Groups Links



Re: Tektronix 475 brightness variation

Artek Manuals <manuals@...>
 

+change down as in "go faster" or lower sweep speed numbers ( which is
really faster sweep speed) ...yes this is normal to a degree at the very
low (faster sweep speed) numbers


On 2/11/2017 1:35 PM, pesho_dage@... [TekScopes] wrote:

I noticed that when I change down the time base of my Tektronix 475
the screen brightness becomes dimmer.
Is that normal? Any similar observations by other owners of 475?
Best regards
Peter



--
Dave
Manuals@...
www.ArtekManuals.com


Re: Tektronix 475 brightness variation

Colin Herbert
 

If, by "change down" you mean changing to faster speeds (shorter times),
then yes, it is normal. This is because the spot isn't staying in one place
for long enough to give a bright trace. On the other hand, if you mean
changing to slower speeds (longer times), then it isn't normal.

Colin.



From: TekScopes@... [mailto:TekScopes@...]
Sent: 11 February 2017 18:36
To: TekScopes@...
Subject: [TekScopes] Tektronix 475 brightness variation





I noticed that when I change down the time base of my Tektronix 475 the
screen brightness becomes dimmer.
Is that normal? Any similar observations by other owners of 475?
Best regards
Peter





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Re: Tek 2465 timebase issue

Artek Manuals <manuals@...>
 

Mark

Dont feel bad,when you get to be my age NOTHING is what it used to be :-(

Unfortunately Tektronix serial numbers have NOTHING to do with any
date-coding. Looking for date codes on caps and IC is the only way to
get an approximation of manufacturing date

I will have your download ready in a few minutes

73

Dave

NR1DX



On 2/11/2017 12:25 PM, 'Mark, G0MGX' @G0MGX [TekScopes] wrote:

Yes, it should have been a "B" - eyesight not what it used to be!

Can we age this from the serial number?

Mark

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: 11 February 2017 16:10
To: TekScopes@...
Subject: Re: [TekScopes] Tek 2465 timebase issue

I suspect that is really B025365 (not 8025365)

Anyway the later USA versions did change "officially" to 1.78B/5.36K at
serial B028680

Dave

manuals@...

On 2/11/2017 10:56 AM, 'Mark, G0MGX' @G0MGX [TekScopes]
wrote:

8025365

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: 11 February 2017 15:56
To: TekScopes@...
Subject: Re: [TekScopes] Tek 2465 timebase issue

R736/R737 were changed to 1.78K/5.36K in the 2465A (or possibly in later
models of the 2465)

What is the serial number of your 2465?

Dave

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Manuals@...
www.ArtekManuals.com

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[Non-text portions of this message have been removed]

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------------------------------------

------------------------------------

Yahoo Groups Links

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Tektronix 475 brightness variation

Peter
 

I noticed that when I change down the time base of my Tektronix 475 the screen brightness becomes dimmer.
Is that normal? Any similar observations by other owners of 475?
Best regards
Peter


Re: OT: Automotive Ignition Noise Suppression Condenser

John Clark
 

Oh, I know this all too well. I've been a corporate pilot for over 20 years and have flown Gulstream G100's and G200's . We only have the G200 now but some years back we had a G100 that would lose it's comm radios and get very staticky whenever we got into the clouds until, after multiple complaints and multiple techs tried to fix it, a good avionics guy finally found the problem...was a bad ground strap somewhere--can't remember where, though. All that static has to discharge off the airplane through the static wicks on the back of the airplane surfaces and that wasn't happening fully. The moisture increases the static electricity.


Yes, it makes for VERY whiny pilots after getting yelled at by controllers who can't get hold of you until you break out of the clouds! I whined quite a few times about it.


John


________________________________
From: TekScopes@... <TekScopes@...> on behalf of lbfulton@... [TekScopes] <TekScopes@...>
Sent: Saturday, February 11, 2017 11:13 AM
To: TekScopes@...
Subject: Re: [TekScopes] OT: Automotive Ignition Noise Suppression Condenser



Your hood grounding advice fellow beat me to it. You ought to hear what a broken ground strap on the radome of a Boeing does to the comm. radios. Big Time static and whining pilots.

[Non-text portions of this message have been removed]





[Non-text portions of this message have been removed]


Re: Tek 2465 timebase issue

Mark
 

Yes, it should have been a "B" - eyesight not what it used to be!

Can we age this from the serial number?

Mark

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: 11 February 2017 16:10
To: TekScopes@...
Subject: Re: [TekScopes] Tek 2465 timebase issue

I suspect that is really B025365 (not 8025365)

Anyway the later USA versions did change "officially" to 1.78B/5.36K at
serial B028680


Dave

manuals@...


On 2/11/2017 10:56 AM, 'Mark, G0MGX' @G0MGX [TekScopes] wrote:

8025365

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: 11 February 2017 15:56
To: TekScopes@...
Subject: Re: [TekScopes] Tek 2465 timebase issue

R736/R737 were changed to 1.78K/5.36K in the 2465A (or possibly in later
models of the 2465)

What is the serial number of your 2465?

Dave

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Manuals@...
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Re: Vintage HP Signal Generator Acquired

Bob Albert
 

Yeah I have a few of those work horses.  They made them for decades and no lab was without several.
Bob

On Saturday, February 11, 2017 8:42 AM, "David Berlind david@... [TekScopes]" <TekScopes@...> wrote:


  Here is a photo of my latest acquisition that I'll be looking to use in
combination with my Tek 2220. The previous owner thinks it works but I
haven't hooked it up yet and I've just left on a business trip.

https://goo.gl/photos/GWj97ERYEtLPR2S56

Suggested "exercises" and other general thoughts are welcome.

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Vintage HP Signal Generator Acquired

David Berlind
 

Here is a photo of my latest acquisition that I'll be looking to use in combination with my Tek 2220. The previous owner thinks it works but I haven't hooked it up yet and I've just left on a business trip.

https://goo.gl/photos/GWj97ERYEtLPR2S56

Suggested "exercises" and other general thoughts are welcome.


Re: OT: Automotive Ignition Noise Suppression Condenser

zerousair
 

Your hood grounding advice fellow beat me to it. You ought to hear what a broken ground strap on the radome of a Boeing does to the comm. radios. Big Time static and whining pilots.


Re: Tek 2465 timebase issue

Artek Manuals <manuals@...>
 

I suspect that is really B025365 (not 8025365)

Anyway the later USA versions did change "officially" to 1.78B/5.36K at
serial B028680


Dave

manuals@...


On 2/11/2017 10:56 AM, 'Mark, G0MGX' @G0MGX [TekScopes] wrote:

8025365

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: 11 February 2017 15:56
To: TekScopes@...
Subject: Re: [TekScopes] Tek 2465 timebase issue

R736/R737 were changed to 1.78K/5.36K in the 2465A (or possibly in later
models of the 2465)

What is the serial number of your 2465?

Dave

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http://www.avg.com

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Dave
Manuals@...
www.ArtekManuals.com


Re: Tek 2465 timebase issue

Mark
 

8025365

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: 11 February 2017 15:56
To: TekScopes@...
Subject: Re: [TekScopes] Tek 2465 timebase issue

R736/R737 were changed to 1.78K/5.36K in the 2465A (or possibly in later
models of the 2465)


What is the serial number of your 2465?

Dave



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Re: Tek 2465 timebase issue

Artek Manuals <manuals@...>
 

R736/R737 were changed to 1.78K/5.36K in the 2465A (or possibly in later
models of the 2465)


What is the serial number of your 2465?

Dave



On 2/11/2017 10:10 AM, Sigurur sgeirsson siggi@... [TekScopes] wrote:

On Sat, Feb 11, 2017 at 05:30 'Mark, G0MGX' @G0MGX
[TekScopes] <TekScopes@...> wrote:



Thanks very much for this; I did search the group before posting but
didn't
find that specific post. My C712 seems OK (unfortunately).

However, looking at the schematic/board around this area I am somewhat
puzzled by the values of R736, 737 and 738.

The components on the board don't match the values on the schematic
for 736
and 737.

I've uploaded an image to the G0MGX folder in the files area called "Say
What" - it shows the issue I can see.
Next time perhaps post your findings textually, took me some time to find
the pic and interpret it.
So the R736/R736 divider is 1.78k/5.36k instead of 1.47k/4.42k. No big
drama, same base ratio, but gives the delay offset slightly higher range.
I don't see a change notice for these at the back of my manual copy, but
that's where you'd generally find them.

[Non-text portions of this message have been removed]

--
Dave
Manuals@...
www.ArtekManuals.com


Re: Tek 2465 timebase issue

Siggi
 

On Sat, Feb 11, 2017 at 05:30 'Mark, G0MGX' @G0MGX
[TekScopes] <TekScopes@...> wrote:



Thanks very much for this; I did search the group before posting but didn't
find that specific post. My C712 seems OK (unfortunately).

However, looking at the schematic/board around this area I am somewhat
puzzled by the values of R736, 737 and 738.

The components on the board don't match the values on the schematic for 736
and 737.

I've uploaded an image to the G0MGX folder in the files area called "Say
What" - it shows the issue I can see.
Next time perhaps post your findings textually, took me some time to find
the pic and interpret it.
So the R736/R736 divider is 1.78k/5.36k instead of 1.47k/4.42k. No big
drama, same base ratio, but gives the delay offset slightly higher range.
I don't see a change notice for these at the back of my manual copy, but
that's where you'd generally find them.


Re: OT: Automotive Ignition Noise Suppression Condenser

John Clark
 

Jim,

Thanks for the reply. The plugs, leads, cap & rotor were about 6 years old and had about 28k miles on them. However, I thought the same thing so I replaced them all. It didn't help.


Someone here suggested the hood might be the problem. I added a ground strap from the hood to the body and problem is solved. It's been nice and quiet ever since. The hood hinges must have a small amount of wear increasing resistance across the hinge.


Thanks,

John

________________________________
From: TekScopes@... <TekScopes@...> on behalf of J Mcvein jmcvein@... [TekScopes] <TekScopes@...>
Sent: Monday, December 26, 2016 6:00 PM
To: TekScopes@...
Subject: Re: [TekScopes] OT: Automotive Ignition Noise Suppression Condenser



John - Your ignition HV leads and spark plugs are pulse
transmission lines and terminations. If you have not doneso, replace the spark leads and plugs, the insulation breaksdown and you could be hearing corona arc. I have had high-energy ignition fire a plug through 4" of carbonized siliconetubing that was a spark lead. The EMF climbs to a point where itwill eventually kill the spark coil secondary winding.
JimMc

From: "johnclark05@... [TekScopes]" <TekScopes@...>
To: TekScopes@...
Sent: Monday, December 26, 2016 2:11 PM
Subject: [TekScopes] OT: Automotive Ignition Noise Suppression Condenser

Thanks for the bandwidth on this off-topic question. I've been trying Internet searches on this and have come up blank. I have a 1998 Nissan 200SX with a 1.6L 4cyl engine. This older vehicle uses a distributor with the coil inside the distributor. On the side of the distributor is a small condenser which looks much like the ignition condensers of yester-year. However, this particular condenser is used only for noise suppression as everything else is electronic.

See pic of the condenser:

https://www.dropbox.com/s/7svq0qiostvedzl/DST59400_S.jpg?dl=0 https://www.dropbox.com/s/7svq0qiostvedzl/DST59400_S.jpg?dl=0
There's nothing complicated with it and it's clearly shown in the schematic here:

https://www.dropbox.com/s/c7u8l9xhxh4qjio/Screenshot%202016-12-26%2016.45.00.png?dl=0 https://www.dropbox.com/s/c7u8l9xhxh4qjio/Screenshot%202016-12-26%2016.45.00.png?dl=0
My question is this. Does anyone know what it's approximate value should be for ignition noise reduction on that circuit? I've checked it and it's reading about 0.471uF with an ESR of 3.2 ohms which doesn't sound right to me on the surface. I've been getting excessive noise on the AM radio (I still love listening to AM radio as probably only the folks here would appreciate,) and it seems to have gotten worse over the last year or two. It's just a capacitor so, after almost 19 years, I would think it's past ready for replacement. Unfortunately, it's not available without buying the entire distributor which, even aftermarket, is $150. It shouldn't be hard to replace it with something if I knew what it should be, and I figured if there was anyone on the planet that knew, it would be somebody here.

Thanks for any help.

John Clark
Charlotte, NC



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Re: Tek 2465 timebase issue

Mark
 

Thanks very much for this; I did search the group before posting but didn't
find that specific post. My C712 seems OK (unfortunately).



However, looking at the schematic/board around this area I am somewhat
puzzled by the values of R736, 737 and 738.



The components on the board don't match the values on the schematic for 736
and 737.



I've uploaded an image to the G0MGX folder in the files area called "Say
What" - it shows the issue I can see.



Is there a source of errata for the service manuals?



Mark

G0MGX







From: TekScopes@... [mailto:TekScopes@...]
Sent: 09 February 2017 21:57
To: TekScopes@...
Subject: RE: [TekScopes] Tek 2465 timebase issue






I had 2465 problem with similar symptoms several years ago that turned out
to be a leaky cap.

My original write up is here:

https://groups.yahoo.com/neo/groups/TekScopes/conversations/messages/110470
https://groups.yahoo.com/neo/groups/TekScopes/conversations/messages/110470

Good luck, this was a bear of a problem to find.

Craig







---
This email has been checked for viruses by AVG.
http://www.avg.com


New file uploaded to TekScopes

TekScopes@...
 

Hello,


This email message is a notification to let you know that
a file has been uploaded to the Files area of the TekScopes
group.


File : /G0MGX/Say What.PNG
Uploaded by : g0mgx <@G0MGX>
Description : Wrong values or components?


You can access this file at the URL:
https://groups.yahoo.com/neo/groups/TekScopes/files/G0MGX/Say%20What.PNG


To learn more about file sharing for your group, please visit:
https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398


Regards,


g0mgx <@G0MGX>


Re: Unidentified cal fixture

Kurt Rosenfeld
 

Makes sense. Thanks.


Re: Unidentified cal fixture

Dave Wise
 

I speculate that it is the precursor to 067-0502-01.

FWIW,
Dave Wise
________________________________________
From: TekScopes@... <TekScopes@...> on behalf of kurt.harlem@... [TekScopes] <TekScopes@...>
Sent: Friday, February 10, 2017 3:27 PM
To: TekScopes@...
Subject: [TekScopes] Unidentified cal fixture

Anybody know what this is? https://drive.google.com/corp/drive/folders/0B-Q3jyZPb-C1b0t4MElkOGd3aVE https://drive.google.com/corp/drive/folders/0B-Q3jyZPb-C1b0t4MElkOGd3aVE


thanks, -Kurt