Date   

Re: SG505 Output voltage too high [RESOLVED]

Richard Solomon <dickw1ksz@...>
 

I make Terminations by soldering
a 1/2W resistor in a BNC connector.

Solder one end to the pin, insert
into the connector and fold over
the other end and solder it to the
connector shell.

Make sure you use a Carbon Comp
resistor, not a wirewound.

73, Dick, W1KSZ

On Sun, Jan 7, 2018 at 3:08 PM, Rick <rpbale@...> wrote:

It turned out that nothing is wrong with it. The SG505 requires a 600 ohm
load on the output for the dB scale to be accurate. Without the load the
voltage will be double what it should be (into a high impedance load of my
other Tek meters and scope. Zero dB into 600 ohms is V = Sqrt(P*R) which
comes out to be Sqrt(0.001*600) = 0.7746 volts.

I don't have 600 ohm terminator or pas-thru so I tapped a line off into an
old Decabox. Now the RMS and Sync voltage calibrate perfectly. I'm going
to try and swap resistors in an old 50 ohms terminator. Last time I did
this I melted the BNC's internal nylon insulator. Maybe I should install
the BNC to another BNC to help heat sync it while desoldering it. Surely
there's a trick of the trade to desolder a terminator.




Re: SG505 Output voltage too high [RESOLVED]

Rick
 

It turned out that nothing is wrong with it. The SG505 requires a 600 ohm load on the output for the dB scale to be accurate. Without the load the voltage will be double what it should be (into a high impedance load of my other Tek meters and scope. Zero dB into 600 ohms is V = Sqrt(P*R) which comes out to be Sqrt(0.001*600) = 0.7746 volts.

I don't have 600 ohm terminator or pas-thru so I tapped a line off into an old Decabox. Now the RMS and Sync voltage calibrate perfectly. I'm going to try and swap resistors in an old 50 ohms terminator. Last time I did this I melted the BNC's internal nylon insulator. Maybe I should install the BNC to another BNC to help heat sync it while desoldering it. Surely there's a trick of the trade to desolder a terminator.


Re: Tunnel diode 585a

Albert Otten
 

On Sun, Jan 7, 2018 at 11:19 am, Fred Schumacher wrote:

Is there a method to check this tunnel diode alone?
Any help appreciated.
Fred,

I would first try to re-adjust the triggering circuit as per calibration procedure. After so many years the bias current needed by the TD will have drifted up somewhat. Maybe a simple re-adjustment solves the problem. Especially because sometimes triggering works an sometimes not. The needed bias is somewhat temperature dependent, so the set value might be just at the border.

Albert


Re: Tek 2465b with down shifted display..

Adrian
 

I'm almost afraid to ask this Chuck but.....how did you find out what that smells like?? Is it one of the Heinz soups I have yet to try?

On 1/7/2018 7:33 PM, Chuck Harris wrote:
it shouldn't smell
like dead fish swimming in a broth of automotive anti-
freeze.


Re: Rockland 7530B Spectrum Analyzer plugin

Colin Herbert
 

Fair enough, I wondered what it was and looked it up on Tekwiki, which gave me the information I passed on. Sorry to cause any confusion. It is listed under 7000-series third-party plug-ins, but the item page then says it is for the TM500 series. Confusing or what?
Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of tmichaels@...
Sent: 07 January 2018 19:45
To: TekScopes@groups.io
Subject: Re: [TekScopes] Rockland 7530B Spectrum Analyzer plugin

Sorry, that is incorrect, it DOES NOT fit in a 500 series mainframe.


Re: Rockland 7530B Spectrum Analyzer plugin

s92187
 

Sorry, that is incorrect, it DOES NOT fit in a 500 series mainframe.


Re: Tek 2465b with down shifted display..

Chuck Harris
 

Hi Mark,

Look at the solder joint appearance. It should be
shiny... like a mirror. If it is milky, or white, in
appearance, they are bad for sure. When you touch the
solder joint with a soldering iron, it shouldn't smell
like dead fish swimming in a broth of automotive anti-
freeze.

The SMD capacitors that were used during the life of
the 2465B were defective due to the seals not being able
to withstand the soldering and cleaning processes that
were available at the time. It is not just tektronix,
SMD electrolytic capacitors failed in all industries.

-Chuck Harris

It is possible that they were replaced before.

Mark Hatch wrote:

Probably, should start a new topic.... But let me hijack my own thread here...

I did measure the ripple on the power supply and looked very closely at those SMD capacitors on A5.

When measuring traditional P-P, all the power supply lines check in well within the spec. However, perhaps, I missed understood the process of checking at 2x frequency, but with "line" triggering, when I increased the time base by 2x, I didn't see any averaging out to the typical 1mv p-p that the spec suggested. It looked pretty much the same as the p-p measurements I initially did.

Also, I have a very late model 2465b, (serial# B07772 I am told late 1996). I looked at the troublesome SMD capacitors and they look pristine under 10x magnification. Should I still preemptively replace them? I have messed things up before when I "fixed something that wasn't broken".... Not so fond memory of an attempt to recap a second Tek 475 (after being successful on the first one) and smoking some parts....

Thanks!
Mark




Re: Rockland 7530B Spectrum Analyzer plugin

Colin Herbert
 

Do you realise that this is a plug-in for the TM500 system, not the 7000-series scopes? Check it out on Tekwiki:

http://w140.com/tekwiki/wiki/Wavetek_Rockland_7530A

Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of tmichaels@...
Sent: 07 January 2018 19:10
To: TekScopes@groups.io
Subject: [TekScopes] Rockland 7530B Spectrum Analyzer plugin

Around 20 years ago I bought a 7530B plugin. I only used it once or twice and then put it on the shelf where it sat until last week. That's when I pulled it out and put it in a 7603 only to find that it doesn't work, doesn't seem to even power up. Since I have no service information or extender cards for this unit I decided to sell it instead of trying to repair it, it's a nice clean unit, complete, nothing missing, the only significant cosmetic issue is the CAL knob on the front panel which is slightly damaged. I have it on Ebay, that's where you'll find it (seller name is "laser-artistry").

Terry


Re: Tunnel diode 585a

Fred Schumacher
 

Thank you for this info. I will have a look tomorrow.
Fred


Sent from my iPad

On 7 jan. 2018, at 17:18, Glydeck via Groups.Io <glydeck=aol.com@groups.io> wrote:

For completeness:

https://archive.org/stream/GeTunnelDiodeManual/Ge1961TunnelDiodeManual#page/n65/mode/2up

https://archive.org/stream/RcaTunnelDiodeManual/Rca1963TunnelDiodeManual#page/n125/mode/2up

George

Sent from my iPad

On Jan 7, 2018, at 3:31 AM, Craig Sawyers <c.sawyers@...> wrote:

Is there a method to check this tunnel diode alone?
Any help appreciated.
All the best for 2018.
Fred
Only with a curve tracer. But both the RCA and GE tunnel diode manuals (both are scanned and on line,
just google) have simple circuits which use a filament transformer, variac, switches and resistors.
And an oscilloscope in x-y mode.

Craig


Re: Tek 2465b with down shifted display..

Mark Hatch
 

Probably, should start a new topic.... But let me hijack my own thread here...

I did measure the ripple on the power supply and looked very closely at those SMD capacitors on A5.

When measuring traditional P-P, all the power supply lines check in well within the spec. However, perhaps, I missed understood the process of checking at 2x frequency, but with "line" triggering, when I increased the time base by 2x, I didn't see any averaging out to the typical 1mv p-p that the spec suggested. It looked pretty much the same as the p-p measurements I initially did.

Also, I have a very late model 2465b, (serial# B07772 I am told late 1996). I looked at the troublesome SMD capacitors and they look pristine under 10x magnification. Should I still preemptively replace them? I have messed things up before when I "fixed something that wasn't broken".... Not so fond memory of an attempt to recap a second Tek 475 (after being successful on the first one) and smoking some parts....

Thanks!
Mark


Rockland 7530B Spectrum Analyzer plugin

s92187
 

Around 20 years ago I bought a 7530B plugin. I only used it once or twice and then put it on the shelf where it sat until last week. That's when I pulled it out and put it in a 7603 only to find that it doesn't work, doesn't seem to even power up. Since I have no service information or extender cards for this unit I decided to sell it instead of trying to repair it, it's a nice clean unit, complete, nothing missing, the only significant cosmetic issue is the CAL knob on the front panel which is slightly damaged. I have it on Ebay, that's where you'll find it (seller name is "laser-artistry").

Terry


Re: 2465b A2 board -8volt reg overheat

bradley.kimbrough@...
 

Dave,

Thanks. I'll take a look.

Brad


Re: First draft of the Tek knob visual index project

Harvey White
 

On Sun, 7 Jan 2018 10:54:34 -0500, you wrote:

Knobs are very easy to parametrically model using OpenSCAD. A model can be made customizable and can be uploaded to Thingiverse. Then one just has to enable the customizer app on a given Thing, and any user can enter the parameters on the Thing web page, and download an STL file of the customized part. The customization can be as extensive as you wish as OpenSCAD is a modeling programming language - there is no limits to what can be parametrized, it only depends on the programming you put into the model.
I use OpenSCAD a lot, it's my primary 3D modeler. It's used for
cases, some knobs, gears, structural members and so on.

I've also done TM5000 latches.


Since OpenSCAD is open-source and widely used, I can offer to model whichever knobs anyone likes - it’s an easy task. A rudimentary truncated cone knob with a given height, large and small diameter, ID, shaft hole and set screw holes, and a flat end axial hole for the cover/cap, and cylindrical grooves, can be modeled in a few minutes and made fully parametrizable/customizable. It can even accept different dimensioning options, e.g. diameter pair vs one diameter and cone angle.
Excellent program, and quite accurate. It's more accurate than the 3D
printer, I might add.

The use of SolidWorks or a similar full-blown cad system is not necessary, and sometimes takes longer than OpenSCAD if one is proficient. As for free offerings, Fusion360 is free (with signup) IIRC, and OnShape is a full-featured modern parametric cad that works in the browser and is free for non-commercial use. I love OnShape - it’s done by a people who fled from the SolidWorks team. It’s quite a feat. And it comes with a programming language (featurescript) that lets you completely script generation of any feature(s).
Might look at OnShape.

thanks,
Harvey

Cheers, Kuba

Skickat från min iPhone

30 dec. 2017 kl. 19:22 skrev nojunkmail@...:

I am interested in helping with this project. I don't have Solidworks skills, but I do have 3D modelling skills (Mastercam). Solidworks is in progress, but that's the difference of learning gimp vs photoshop (bad comparison I know, but you get the idea).

Anyhow, I have a Tek manual on specifications that also contain "blueprints", with dimensions and all that. Not truly blueprints, but good 'nuff for what were doing, I believe. I just picked it up off of flea-bay and is called the "1988 Mechanical Catalog: Volume 2". I bid against someone else, but I was determined not to miss this, since I don't trust the other buyer to scan it in and share it, as I do. Plus it happened to be local to me - which just about never happens.

Does anyone else have the other Volumes?

There's gotta be volume 1 out there at a minimum, if it hasn't been destroyed - as so eloquently stated in the book

Quote from first page, "DO NOT SEND YOUR OUTDATED CATALOGS TO THE COMMON DESIGN PARTS CATALOG GROUP. PLEASE SEND OUTDATED CATALOGS TO SALVAGE."

I have somewhat limited access to HAAS CNC machines, so I can make "some" things, if I don't take too much machine time away from the shop. I envision that I could probably easily make faceplates (out of plastic) on the CNC, with probably better results than a 3D printer (and a lot less work). Knobs, might be more difficult. Fixturing (holding) is probably the most difficult thing for me to do on the CNC with these types of widgets. Never tried to make an angled knob - I'm still relatively new to machining processes (couple years in school only gets you to entry level) but it sure as heck won't stop me from trying.

Cheers!

-Dano





Re: Tunnel diode 585a

Glydeck
 

On Jan 7, 2018, at 3:31 AM, Craig Sawyers <c.sawyers@...> wrote:

Is there a method to check this tunnel diode alone?
Any help appreciated.
All the best for 2018.
Fred
Only with a curve tracer. But both the RCA and GE tunnel diode manuals (both are scanned and on line,
just google) have simple circuits which use a filament transformer, variac, switches and resistors.
And an oscilloscope in x-y mode.

Craig







Re: First draft of the Tek knob visual index project

Kuba Ober
 

Knobs are very easy to parametrically model using OpenSCAD. A model can be made customizable and can be uploaded to Thingiverse. Then one just has to enable the customizer app on a given Thing, and any user can enter the parameters on the Thing web page, and download an STL file of the customized part. The customization can be as extensive as you wish as OpenSCAD is a modeling programming language - there is no limits to what can be parametrized, it only depends on the programming you put into the model.

Since OpenSCAD is open-source and widely used, I can offer to model whichever knobs anyone likes - it’s an easy task. A rudimentary truncated cone knob with a given height, large and small diameter, ID, shaft hole and set screw holes, and a flat end axial hole for the cover/cap, and cylindrical grooves, can be modeled in a few minutes and made fully parametrizable/customizable. It can even accept different dimensioning options, e.g. diameter pair vs one diameter and cone angle.

The use of SolidWorks or a similar full-blown cad system is not necessary, and sometimes takes longer than OpenSCAD if one is proficient. As for free offerings, Fusion360 is free (with signup) IIRC, and OnShape is a full-featured modern parametric cad that works in the browser and is free for non-commercial use. I love OnShape - it’s done by a people who fled from the SolidWorks team. It’s quite a feat. And it comes with a programming language (featurescript) that lets you completely script generation of any feature(s).

Cheers, Kuba

Skickat från min iPhone

30 dec. 2017 kl. 19:22 skrev nojunkmail@...:

I am interested in helping with this project. I don't have Solidworks skills, but I do have 3D modelling skills (Mastercam). Solidworks is in progress, but that's the difference of learning gimp vs photoshop (bad comparison I know, but you get the idea).

Anyhow, I have a Tek manual on specifications that also contain "blueprints", with dimensions and all that. Not truly blueprints, but good 'nuff for what were doing, I believe. I just picked it up off of flea-bay and is called the "1988 Mechanical Catalog: Volume 2". I bid against someone else, but I was determined not to miss this, since I don't trust the other buyer to scan it in and share it, as I do. Plus it happened to be local to me - which just about never happens.

Does anyone else have the other Volumes?

There's gotta be volume 1 out there at a minimum, if it hasn't been destroyed - as so eloquently stated in the book

Quote from first page, "DO NOT SEND YOUR OUTDATED CATALOGS TO THE COMMON DESIGN PARTS CATALOG GROUP. PLEASE SEND OUTDATED CATALOGS TO SALVAGE."

I have somewhat limited access to HAAS CNC machines, so I can make "some" things, if I don't take too much machine time away from the shop. I envision that I could probably easily make faceplates (out of plastic) on the CNC, with probably better results than a 3D printer (and a lot less work). Knobs, might be more difficult. Fixturing (holding) is probably the most difficult thing for me to do on the CNC with these types of widgets. Never tried to make an angled knob - I'm still relatively new to machining processes (couple years in school only gets you to entry level) but it sure as heck won't stop me from trying.

Cheers!

-Dano




Re: Tunnel diode 585a

Craig Sawyers <c.sawyers@...>
 

Is there a method to check this tunnel diode alone?
Any help appreciated.
All the best for 2018.
Fred
Only with a curve tracer. But both the RCA and GE tunnel diode manuals (both are scanned and on line,
just google) have simple circuits which use a filament transformer, variac, switches and resistors.
And an oscilloscope in x-y mode.

Craig


Tunnel diode 585a

Fred Schumacher
 

Hi All,
Recently got a 585a, equiped with a type 81 adaptor and a M plug-in. Most of the problems were due to faulty electrolytic caps.
Although premium quality Spragues, they will fail eventualy.
But the most troublesome problem is with the triggering of the incoming signals. Sometimes the trigger process is fine, but most of it, this process is not working, even with line triggering activated. Only if the trigger selector is in the HF Sinc position, the image is stable. So my question is, is the tunnel diode working correctly or should I try to get a new one. I have checked the circuits before the trigger and everything seems to be allright. Is there a method to check this tunnel diode alone?
Any help appreciated.
All the best for 2018.
Fred


Re: 2465b A2 board -8volt reg overheat

ArtekManuals
 

Brad

Dont remember that one being talked about before. Not much circuit wise to talk about  there so the first suspect would be the 100uf C1350, then check the BCE junctions on the two transistors. the one is a darlington so that could be tricky. After that then possible that the "load" is not on the A2A1 board but rather else where in the scope on the -8V bus

Dave
manuals@...

On 1/6/2018 12:38 PM, bradley.kimbrough@... wrote:
Hello All,

I have a 2465b, early serial number. I have posted a picture to the photos albums, (2465B A2 -8volt Reg Overheat) showing the -8 volt regulator transistor and resistors with signs of significant overheating. Does anyone know if this is a known problem with this board? Has anyone seen this before?

Regards,

Brad


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


2465b A2 board -8volt reg overheat

bradley.kimbrough@...
 

Hello All,

I have a 2465b, early serial number. I have posted a picture to the photos albums, (2465B A2 -8volt Reg Overheat) showing the -8 volt regulator transistor and resistors with signs of significant overheating. Does anyone know if this is a known problem with this board? Has anyone seen this before?

Regards,

Brad


Re: TDS520 Option 13

jafinch78 .
 

On Sat, Jan 6, 2018 at 07:15 am, Siggi wrote:


The best I've ever found is here:
https://forum.tek.com/viewtopic.php?f=568&t=137307&sid=31a77051187e2c6dd92497319a3d923c&start=20
070-8567-00 doesn't contain schematics. I uploaded all my latest documents to KO4BB.

I just received an email from KO4BB that they're available: http://www.ko4bb.com/getsimple/index.php?id=manuals&dir=Tektronix

I didn't want to take apart the TDS-520B I have until I have a bench to work on (at a home renovation site working and using some of the tore out wood to build one though need a clean enough room to work in first). Thinking I'll bring out and open up the TDS-520B eventually and photograph and document in detail since I'm thinking that will be a fun project and resource to have public.

I've heard the VGA is a pass through that can be acquired from the A11 board from 6 pins somewhere directly on the board. I was thinking the J5 pins or somewhere around there if not further down where I haven't read into yet regarding the CRT connection say converted with an arcade to VGA adapter.

The RS232 and Centronics ports are more complex. The RS232 is noted online like you referenced Siggi. A ADuM1402, SCN68681C1A44 and FT230X as a debug interface can take advantage of the J40 edge connector.

I'm not sure about the x4 BNC connectors or Centronics details exactly.