Date   

Re: TM500 Series Extender Cable Keeps falling out

Edward Oscarson <scskits@...>
 

Take apart a TM502 and use the power supply section as a test fixture. Makes it easy to work on single and double wide modules. Just rotate the assembly to get to the side you want. Move a single between slots so that one side is always on the bench.Fixed dozens of modules this way...

On Saturday, February 24, 2018 9:20 PM, brasscat <brasscat@...> wrote:


Hello the Forum, I set up to work on an FG503 function generator. Only problem is the extender cable won't stay inserted (Into a TM504). How I wish it was as the 7000 cable extender with the fixed body to hold it in place. The cable is sort of short and any movement unplugs it. Any here have the same problem, and what's the work around??

Thanks, Stan


Failing to access w140.com

 

Response from my VPN provider:

Unfortunately it appears that the website w140.com is hosted on
DreamHost.com's servers, DreamHost has recently implemented
an IP block that prevents many connections from our servers to websites
that they host.

:(
Dave


Re: Most Recent Calibration Fixtures Catalog

Pete Lancashire
 

Don't hit me but near the end I believe microfiche became the default way
they were provided

On Feb 24, 2018 5:23 PM, "Dennis Tillman W7PF" <@Dennis_Tillman_W7pF> wrote:

Thanks for all the help locating the 067-1201-99 Construction Article. I
had
it all along but it was in the wrong place on my PC.



I was also hoping I could locate a Calibration Fixtures Catalog that was
more recent than the 1980 one I already have.

Dave Casey indicated he had a Cal Fixtures Catalog that covered higher
numbers than the 1980 Cal Fixtures Catalog which ends 067-0962-xx.

I searched Google for anything newer than 1980 (which I already have with
no
luck



I did recall that the Cal Fixtures were often (but not always) listed in
the
back of the Tek Logistics Data Books which came out periodically.

For instance there was a 1976 Logistics Data Book but I don't think it had
a
cal Fixtures section.

So I searched Google for Logistics Data Books with no luck.



Any help finding a more recent Cal Fixtures Catalog than the 1980 one I
already have would be appreciated.



Dennis Tillman W7PF





TM500 Series Extender Cable Keeps falling out

brasscat
 

Hello the Forum, I set up to work on an FG503 function generator. Only problem is the extender cable won't stay inserted (Into a TM504). How I wish it was as the 7000 cable extender with the fixed body to hold it in place. The cable is sort of short and any movement unplugs it. Any here have the same problem, and what's the work around??

Thanks, Stan


Most Recent Calibration Fixtures Catalog

 

Thanks for all the help locating the 067-1201-99 Construction Article. I had
it all along but it was in the wrong place on my PC.



I was also hoping I could locate a Calibration Fixtures Catalog that was
more recent than the 1980 one I already have.

Dave Casey indicated he had a Cal Fixtures Catalog that covered higher
numbers than the 1980 Cal Fixtures Catalog which ends 067-0962-xx.

I searched Google for anything newer than 1980 (which I already have with no
luck



I did recall that the Cal Fixtures were often (but not always) listed in the
back of the Tek Logistics Data Books which came out periodically.

For instance there was a 1976 Logistics Data Book but I don't think it had a
cal Fixtures section.

So I searched Google for Logistics Data Books with no luck.



Any help finding a more recent Cal Fixtures Catalog than the 1980 one I
already have would be appreciated.



Dennis Tillman W7PF


Re: 5L4N Cam Switch Diagram

Artekmedia <manuals@...>
 

Rick

As I read the schematic the dots are only valid for when the switches are in the - 50dBm position. I think the dots would be different for -30dBm and so on.  the theory of operation section of how the switches choose (turn on) different gain sections sheds some light on the scheme, Admittedly the manual would be more useful if there were a set of dots for each setting in the manual but alas the proof in this case seems to be left to the student

If you have reason the believe S680 is in reasonable  condition you could draw your own "map" as a function of the attenuator setting by measuring across each of the 5 switch poles as function of each switch position. I suspect but this is only a guess that some of the dots are a also a function of the LIN/LOG setting, again this is only a guess

-DC
manuals@...

On 2/24/2018 4:41 PM, Rick wrote:
Does anyone know how to read the cam switch schematic? On this 5L4N cam switch S680's diagram shows 3 dots in some positions and only 2 in other positions. I assume the dots mean the switch is closed, no dot means it's open. But why so many dots. For instance on switch S680 cam 1 in the -30db position is has 3 dots while -20db position has only 2 dots. What is the significance. It's still just the switch position of a SPST. Seems like only two dots or one would have been good enough for the schematic. The diagram is here https://groups.io/g/TekScopes/album?id=30697


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


Re: Tek High Amplitude Pulse Generator TM500 manual needed

 

Hi Bob,
My fault. I meant PG509. There was no PG109.
Dennis Tillman W7PF

-----Original Message-----
From: Bob [mailto:bobh@...]
Sent: Saturday, February 24, 2018 6:24 AM
To: Dennis Tillman <@Dennis_Tillman_W7pF>
Subject: Re: [TekScopes] Tek High Amplitude Pulse Generator TM500 manual needed

Dennis,

Was there a PG 109 as well as a PG 509? It's an interesting device for sure and I certainly understand your quest to document the variants.

I never even thought about using TDR to stretch the pulse duration for a generator. Maybe I just don't remember that far back.

Thanks,

Bob.


On 2/23/2018 5:11 PM, Dennis Tillman W7PF wrote:
Hi Ed,

I was wondering about the hardline diameter too. The 067-1094-99 Pulse Generator (the most recent one I own, which may or may not be similar to the PG 109) has 0.25" hard line which I haven't seen before. You explained why it was needed. This puts out 25V into 50 ohms which is 1/2 Amp. That's a lot of voltage and current which is guaranteed to blow out the front end of any Tek 50 ohm plugin so be careful to use at least a 10:1 attenuator that can handle at least 12.5 Watts.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Ed
Breya via Groups.Io
Sent: Friday, February 23, 2018 3:38 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tek High Amplitude Pulse Generator TM500
manual needed

David, the diameter of the hardline does make a big difference. I have used 141 for most pulsers I have experimented with. I once tried the next smaller size (078? - I forget what number it's called, even though I use it all the time), figuring I could make it more compact. What a disappointment. The edges and flats all suffered greatly. It has a lot to do with the line loss, which gets worse with smaller line diameter. When the transistor goes into avalanche, its resistance is comparable to the 50 ohm line resistance, so you've got something around 70-100V on around 100 ohms, resulting in upwards of an amp to deliver from the line. Too small a line just can't handle it, so everything is smaller and slower. Of course, an even bigger line will do better yet. Tek used to offer a very large 1/2-5/8" or so by maybe 70 nSec as I recall, for pulse generator and signal delay work, way back when. I had one many years ago, but it's long gone. It was the size of a suitcase.

Ed


--
Dennis Tillman W7PF
TekScopes Moderator


Re: Tek 2465a grid bias and brightness problems

Francesco
 

My problem is very similar to this one:
https://youtu.be/9uWekOND8Tg

Except my readout is brighter and perfectly focused and I haven't the uncalibrated dots, but the disturbance are exactly the same and I cannot dim traces completely off, the maker of that video solved his problem reflowing some bad solder joints on the a9 board near the vz out resistors and diode. (Cr1915, r1922, r1913) but that solution did not work for me.


Re: Tek 2465a grid bias and brightness problems

Francesco
 

And that is exactly my problem, grid bias is already at minimum, intensity fully CCW but I cannot extinguish the dot nor of course the traces.


5L4N Cam Switch Diagram

Rick
 

Does anyone know how to read the cam switch schematic? On this 5L4N cam switch S680's diagram shows 3 dots in some positions and only 2 in other positions. I assume the dots mean the switch is closed, no dot means it's open. But why so many dots. For instance on switch S680 cam 1 in the -30db position is has 3 dots while -20db position has only 2 dots. What is the significance. It's still just the switch position of a SPST. Seems like only two dots or one would have been good enough for the schematic. The diagram is here https://groups.io/g/TekScopes/album?id=30697


Re: Guidance w/ Tek 475

Brian
 

Hi Nagi , pleased that I was able to make a helpful suggestion . I dont often find an opportunity to post anything helpful as I find myself somewhat outclassed by the guys on here , who have toys I can only dream of having . I have to stop buying new toys as I have no space left now -- Tektronix 500 , 560 , 7000 series scopes and 2465A . I have a few (perhaps a little more than a few) other bits and pieces hidden in dark corners , but no room for more .
Brian
From: N0AGI <n0agi@...>
To: TekScopes@groups.io
Sent: Saturday, 24 February 2018, 19:24
Subject: Re: [TekScopes] Guidance w/ Tek 475

Thank you Brian - I will give that a try.  Much appreciate the pointer.
-nagi


73s, N0AGI – Nagi
https://MNDMR.net/
https://N0AGI.com/

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Brian via Groups.Io
Sent: Friday, February 23, 2018 11:04 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Guidance w/ Tek 475

Hi Nagi , you could contemplate getting hold of an old - for parts 7B53A plug-in , I've seen 2 parts unit on Ebay . They should have one of these if the pcb's are comlete , it might be worth asking the seller before buying .
Brian
      From: N0AGI <n0agi@...>
To: TekScopes@groups.io
Sent: Friday, 23 February 2018, 16:51
Subject: Re: [TekScopes] Guidance w/ Tek 475
 
Hello fellow TEK enthusiasts,
Does anyone have any suggestions on the below

---

Ok - a quick update.  I had taken the scope to a local engineer (fellow ham radio enthusiast).  He had looked and concluded that the chip u600 155-0049-01 has gone bad.

Him and I looked for this part on a few online stores, but, did not find one anywhere. 

Does anyone here know if and where I can find this part ?
u600 155-0049-01

---

Thanks
Nagi


-----Original Message-----
From: Nagi Punyamurthula
Sent: Tuesday, February 20, 2018 5:18 PM
To: TekScopes@groups.io
Subject: RE: [TekScopes] Guidance w/ Tek 475

Ok - a quick update.  I had taken the scope to a local engineer (fellow ham radio enthusiast).  He had looked and concluded that the chip u600 155-0049-01 has gone bad.

Him and I looked for this part on a few online stores, but, did not find one anywhere. 

Does anyone here know if and where I can find this part ?
u600 155-0049-01


Thanks
Nagi

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of N0AGI
Sent: Wednesday, February 14, 2018 3:32 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Guidance w/ Tek 475

[This sender failed our fraud detection checks and may not be who they appear to be. Learn about spoofing at http://aka.ms/LearnAboutSpoofing]

Will do. I have made a list of things I should look at and try this Friday.

Thanks to all for your invaluable support and help - this is super helpful.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Mlynch001
Sent: Wednesday, February 14, 2018 6:46 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Guidance w/ Tek 475

I forgot to add, try the "B" channel as well.  Also, read that initial performance check setup for the control settings that are required to obtain a trace.  I have seen many "Bad" scopes that just had one or two switches set wrong. Hope you get the old machine working.  I have a 465B, which is one of the iconic TEKTRONIX machines.


Re: Tek 2465a grid bias and brightness problems

Chuck Harris
 

The blanking input should be able to drive the CRT fully
off.

The grid bias control should be able to turn the CRT fully
off (when intensity control is fully CCW).

The 2465A does the grid bias adjustment using the calibration
routine, but you can also set it as follows:

Adjust focus and astigmatism for the smallest, roundest, dot
possible at a reasonable intensity level.

Adjust the intensity control CCW until the pointer is in the
9:00 position. Adjust the grid bias for the dimmest visible
dot, in room lighting.

When the intensity control is fully CCW, the dot should be
gone.

You must be able to extinguish the dot when the intensity control
is fully CCW with the grid bias control.

-Chuck Harris

Francesco wrote:

However the trace does not completely blanks when blinking, it just reaches the same low level of intensity of the front panel pot and then goes bright, low level of intensity, bright, etc etc


Re: Guidance w/ Tek 475

N0AGI
 

Thank you Brian - I will give that a try. Much appreciate the pointer.
-nagi


73s, N0AGI – Nagi
https://MNDMR.net/
https://N0AGI.com/

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Brian via Groups.Io
Sent: Friday, February 23, 2018 11:04 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Guidance w/ Tek 475

Hi Nagi , you could contemplate getting hold of an old - for parts 7B53A plug-in , I've seen 2 parts unit on Ebay . They should have one of these if the pcb's are comlete , it might be worth asking the seller before buying .
Brian
From: N0AGI <n0agi@...>
To: TekScopes@groups.io
Sent: Friday, 23 February 2018, 16:51
Subject: Re: [TekScopes] Guidance w/ Tek 475

Hello fellow TEK enthusiasts,
Does anyone have any suggestions on the below

---

Ok - a quick update.  I had taken the scope to a local engineer (fellow ham radio enthusiast).  He had looked and concluded that the chip u600 155-0049-01 has gone bad.

Him and I looked for this part on a few online stores, but, did not find one anywhere. 

Does anyone here know if and where I can find this part ?
u600 155-0049-01

---

Thanks
Nagi


-----Original Message-----
From: Nagi Punyamurthula
Sent: Tuesday, February 20, 2018 5:18 PM
To: TekScopes@groups.io
Subject: RE: [TekScopes] Guidance w/ Tek 475

Ok - a quick update.  I had taken the scope to a local engineer (fellow ham radio enthusiast).  He had looked and concluded that the chip u600 155-0049-01 has gone bad.

Him and I looked for this part on a few online stores, but, did not find one anywhere. 

Does anyone here know if and where I can find this part ?
u600 155-0049-01


Thanks
Nagi

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of N0AGI
Sent: Wednesday, February 14, 2018 3:32 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Guidance w/ Tek 475

[This sender failed our fraud detection checks and may not be who they appear to be. Learn about spoofing at http://aka.ms/LearnAboutSpoofing]

Will do. I have made a list of things I should look at and try this Friday.

Thanks to all for your invaluable support and help - this is super helpful.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Mlynch001
Sent: Wednesday, February 14, 2018 6:46 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Guidance w/ Tek 475

I forgot to add, try the "B" channel as well.  Also, read that initial performance check setup for the control settings that are required to obtain a trace.  I have seen many "Bad" scopes that just had one or two switches set wrong. Hope you get the old machine working.  I have a 465B, which is one of the iconic TEKTRONIX machines.


Re: 7603 working .... then blank

Roger Evans
 

Dave,

Thanks for that clarification,

Roger


Re: Replacing power cords...

ken chalfant
 

Hi Phil,

It might be worth your time to visit: www.interpower.com<http://www.interpower.com>

The offer a variety of different power cords and may well have a suitable one.

Additionally, and I did not look, either Digi-Key or Mouser may have what you need.

Good hunting!

Ken


Hi all,

My recentl acquisition, a Sony/Tektronics 335 portable, has a stiff,
unmanageable power cord. I don't like it. I think power cords should
be pliable, resilient, and curl nicely and neatly, so I am thinking
about replacing it with a new(er) cord.

What would you replace the power cord with. The original has a plug
with a cord grabber and is designed to wrap around the back end of the
scope for storage (since it is a portable).

Well, any recommendations for a good power cable for my portable scope?

Thanks in advance,

Phil


Re: 7603 working .... then blank

Dave Hills
 

U973E should be turned OFF, its base is 4.3V negative with respect to its emitter. It has a 180k collector load resistor so with a high impedance voltmeter its collector voltage should read something similar to the +50V supply ie +0.7V. In fact its collector voltage is more negative than its emitter which is distinctly suspicious.

Probably due to forward current through CR981 and the collector of U973B.


Re: Tek 2465a grid bias and brightness problems

Francesco
 

However the trace does not completely blanks when blinking, it just reaches the same low level of intensity of the front panel pot and then goes bright, low level of intensity, bright, etc etc


Re: Tek 2465a grid bias and brightness problems

Francesco
 

It works, 5Vpp 5hz square wave and the calibrator waveform blinks nicely.


Re: Replacing power cords...

Bill Riches
 

Bingo!

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Michael A. Terrell
Sent: Friday, February 23, 2018 11:14 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Replacing power cords...

Heyco?

-----Original Message-----
From: Bill Riches <@neff1942>
Sent: Feb 23, 2018 8:05 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Replacing power cords...

Not familiar with that scope but could you use one of those black hard plastic strain reliefe clips that grab the cable. Cannot think of the name. I use several sizes and have two weird pliers to squeeze them together to fit in the hole.

73,

Bill, WA2DVU
Michael A. Terrell


Re: Tek 2465a grid bias and brightness problems

Chuck Harris
 

You could try sticking a 5V signal into the Z-axis BNC
on the back of the scope. This would reveal whether the
blanking circuitry is working.

-Chuck Harris

Francesco wrote:

Pin 22 and 23 sorry