Date   
Re: tektronix 224

oudot damien
 

yes the 224 do X-Y!



From: @Raymond [TekScopes]
Sent: Wednesday, November 02, 2016 5:44 PM
To: TekScopes@...
Subject: [TekScopes] Re: tektronix 224



- Can the 224 do X-Y? If so, check if there's X deflection in that case.
- Did you follow any diagnostic procedures, esp. the "chiclets" (yes/no boxes) as per the flow charts and if so, with what results?
- You may want to check the sweep generator circuit (A2 CPU/Display Bd). Not a very difficult circuit to check for operation or not. Work from output back.

Raymond

Re: tektronix 224

 

I find this quartz where on the circuit? How do I check?
>>
> Sorry, I have no idea...
It may be that there's not a separate Xtal for it, even though it's shown like that on the block diagram.
It may be derived from the main oscillator, using Y201. If so, it makes sense to check the sweep generator circuit as mentioned earlier and possibly the trigger circuits ("is a trigger signal coming from the trigger circuit"?).

BTW, is operator error excluded?

Sorry, I'll have to be silent for a while because of time constraints as mentioned earlier. I'll follow the thread though.

Raymond

Re: tektronix 224

 

I find this quartz where on the circuit? How do I check?
Sorry, I have no idea...
I saw it on the Block Diagram (Fig. 3.1) of my 222A manual (have no 224 manual). Unfortunately, I can't spend much time on it at the moment.
The 224 and 222 are mostly the same AFAIK, with the vertical BW of the 224 being a lot wider but no change in sampling rate etc.

Seeing it using a low-capacity hi-Z probe (< 15 pF) should be possible. Try both sides of the Xtal. Your probing may influence frequency but that's not important for this go/no-go test. You may even measure using a series resistor of a few 100 KOhm. Again, observed amplitude and frequency are not important.
Since I don't know where to find it, it may be easier to probe somewhere else. It's just that these Xtals are usually easy to find by their looks.

Raymond

Re: tektronix 224

 

Hi Christophe,

I agree with Raymond. Owning a manual is important if for no other reason
than to learn how to use the scope. But you may need it for troubleshooting
your symptoms as well. You also need to do some more detailed diagnosis in
order to report back on your results. You gave us virtually nothing to go
on. To do this properly you need to acquire a manual so you can go through
the setup procedure and so you can learn more about the various parts of the
scope.

It sounds like the triggering is not set right (do you get a trigger light
when you fiddle with the trigger level and/or slope) or that there is a bad
trigger circuit.

If the scope has an XY mode what happens when you apply a signal to the
horizontal channel in XY mode?

Dennis Tillman W7PF

-----Original Message-----
Sent: Wednesday, November 02, 2016 8:28 AM
Subject: [TekScopes] Re: tektronix 224

There's no readout of settings eitheri.e. the numbers att the bottom (and
top) of the screen?

Qservice (no affiliation) has a Service Manual as a PDF on CD or for
download

<http://www.qservice.tv/vpasp/shopdisplayproducts.asp?page=3>
http://www.qservice.tv/vpasp/shopdisplayproducts.asp?page=3

Most likely, you'll need it

Raymond
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Posted by: @Raymond
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-----Original Message-----
Sent: Wednesday, November 02, 2016 4:05 AM
Subject: [TekScopes] tektronix 224

Hello, I just bought a used 224 tektronix. Everything works except the
horizontal scanning. Can you help me? Cordially. Christophe
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Posted by: lcristoftrain@...
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Re: tektronix 224

 

- Can the 224 do X-Y? If so, check if there's X deflection in that case.
- Did you follow any diagnostic procedures, esp. the "chiclets" (yes/no boxes) as per the flow charts and if so, with what results?
- You may want to check the sweep generator circuit (A2 CPU/Display Bd). Not a very difficult circuit to check for operation or not. Work from output back.

Raymond

Re: Advise needed - thinning the herd

Dave Wise
 

7603 = best home for a digital-storage SA plugin. You know you want one.

Dave
________________________________________
From: TekScopes@... <TekScopes@...> on behalf of 'Dennis Tillman' @Dennis_Tillman_W7PF [TekScopes] <TekScopes@...>
Sent: Wednesday, November 02, 2016 9:23 AM
To: TekScopes@...
Subject: RE: [TekScopes] Advise needed - thinning the herd

Hi Chris,

I agree completely with David.

The 7104 has several very important advantages over all of the other 7000
scopes:
* 1GHz+ analog performance
* Brilliant display capability. Single shot sub-nSec pulses are visible in
daylight.
* 500MHz XY capability. No other 7000 scope even comes close to the
horizontal bandwidth of the 7104. This horizontal BW is essential for high
speed XY. Most other 7000 horizontal amplifiers can't even reach 50MHz.

The 7854 has its own unique capabilities
* 400MHz analog capability and 10 bit digital sampling capability. The
sampling is slow by today's standards but it sure comes in handy as a
temporary storage scope.
* GPIB programmability

I would also recommend keeping a 7603 as a third mainframe because of the
size of the CRT.

Dennis Tillman W7PF

Re: tektronix 224

oudot damien
 

thank you, I find this quartz where on the circuit?
How do I check?

From: @Raymond [TekScopes]
Sent: Wednesday, November 02, 2016 5:25 PM
To: TekScopes@...
Subject: [TekScopes] Re: tektronix 224



Just a hunch and simple to check, without looking into the circuit in detail: The 20 MHz Time Base acquisition clock, possibly as simple as the quartz crystal. I've seen these die of fatigue.

Raymond

Re: tektronix 224

 

Just a hunch and simple to check, without looking into the circuit in detail: The 20 MHz Time Base acquisition clock, possibly as simple as the quartz crystal. I've seen these die of fatigue.

Raymond

Re: Advise needed - thinning the herd

 

Hi Chris,

I agree completely with David.

The 7104 has several very important advantages over all of the other 7000
scopes:
* 1GHz+ analog performance
* Brilliant display capability. Single shot sub-nSec pulses are visible in
daylight.
* 500MHz XY capability. No other 7000 scope even comes close to the
horizontal bandwidth of the 7104. This horizontal BW is essential for high
speed XY. Most other 7000 horizontal amplifiers can't even reach 50MHz.

The 7854 has its own unique capabilities
* 400MHz analog capability and 10 bit digital sampling capability. The
sampling is slow by today's standards but it sure comes in handy as a
temporary storage scope.
* GPIB programmability

I would also recommend keeping a 7603 as a third mainframe because of the
size of the CRT.

Dennis Tillman W7PF

-----Original Message-----
Sent: Wednesday, November 02, 2016 8:46 AM
Subject: RE: [TekScopes] Advise needed - thinning the herd

My opinion FWIW is 7854 and a 7104 plus maybe a 7633/7623B for those slow
PIs that benefit from storage mode.

You may prefer a 7904A over a 7104 for longevity if you use it often as
those MCP CRTs do wear out ...

Dave

-----Original Message-----
Sent: 02 November 2016 15:05
Subject: [TekScopes] Advise needed - thinning the herd

I've been thinking about getting a *new* scope. Actually brand new. I've
never done that. Maybe an Agilent 2000/3000 series. (Yeah,
Keysight....I've been thinking a while now.) I have entirely too many
scopes. Mostly Tek 7000 series. About 25 of them! And I'm tired of
carrying and storing them.

But I do want to keep some analog scopes around. Maybe one or two 7000
mainframes and a good set of plugins.

The question is which two Tek 7k scopes should I have on hand? I'm not
worried about plug ins right now...that's a future project. Just the
mainframes for now. I require X-Y mode capability, but other than that it's
wide open.

What would you recommend and why?

Thanks,
-Chris
------------------------------------
Posted by: cwilkson@...
------------------------------------

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Posted by: "David C. Partridge" <@perdrix>

Re: tektronix 224

oudot damien
 

yes the readout is ok . It is on screen!

I have the service manual.


From: @Raymond [TekScopes]
Sent: Wednesday, November 02, 2016 4:27 PM
To: TekScopes@...
Subject: [TekScopes] Re: tektronix 224



There's no readout of settings eitheri.e. the numbers att the bottom (and top) of the screen?

Qservice (no affiliation) has a Service Manual as a PDF on CD or for download

<http://www.qservice.tv/vpasp/shopdisplayproducts.asp?page=3> http://www.qservice.tv/vpasp/shopdisplayproducts.asp?page=3

Most likely, you'll need it


Raymond

Re: Advise needed - thinning the herd

stefan_trethan
 

You need one of each. They all have their specific strengths. ;-)

Actually I think the plugins determine which MF you need to keep.
I like to use my 7D20 every now and then (no fan, quick to start), in
a OS254P/U with the large screen.

If you do not have a DA1855 you need to keep your 7A13 operating, and
also your 7A22, unless you have an AM502. They don't require all that
much in terms of MF, but storage might be nice.

You will know if you need to keep any of the fast mainframes.

As for the new HP, I prefer to use the Lecroy DDA125 rather than a
MSOX3054. That's a 17 year old Lecroy winning against a current model
from HP. Just saying I wouldn't go there, but the same is true for the
current low end Asia made Lecroys (Up to and including Wavesurfer
3000).

Test drive any new scope for an extended period on actual circuits
before you buy. A quick demo with the sales person breathing down your
neck is not good enough.

I just don't think threre's good value for money there, in new low end
scopes, but that's your business.

ST



On Wed, Nov 2, 2016 at 4:05 PM, cwilkson@... [TekScopes]
<TekScopes@...> wrote:
I've been thinking about getting a *new* scope. Actually brand new. I've never done that. Maybe an Agilent 2000/3000 series. (Yeah, Keysight....I've been thinking a while now.) I have entirely too many scopes. Mostly Tek 7000 series. About 25 of them! And I'm tired of carrying and storing them.


But I do want to keep some analog scopes around. Maybe one or two 7000 mainframes and a good set of plugins.


The question is which two Tek 7k scopes should I have on hand? I'm not worried about plug ins right now...that's a future project. Just the mainframes for now. I require X-Y mode capability, but other than that it's wide open.


What would you recommend and why?


Thanks,
-Chris






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Posted by: cwilkson@...
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Yahoo Groups Links


Re: Advise needed - thinning the herd

 

I agree with what others have mentioned but I'd add (!) a 7603 for its large screen, ease of use, relative simplicity in repairing.
To tell the truth, you need all of them...

Raymond

Re: Advise needed - thinning the herd

John Griessen
 

On 11/02/2016 10:05 AM, cwilkson@... [TekScopes] wrote:
The question is which two Tek 7k scopes should I have on hand? I'm not worried about plug ins right now...that's a future project.
Just the mainframes for now. I require X-Y mode capability, but other than that it's wide open.


What would you recommend and why?
7844 for its ability to sweep 2 fast signals and compare them
7854 for storing the outputs of your 7k plugins
7904A for fast signals
7104 super fast

If just two, and you don't think in terms of super fast 7104,

just keep these:

7844 for its ability to sweep 2 fast signals and compare them
7854 for storing the outputs of your 7k plugins

Re: Advise needed - thinning the herd

 

My opinion FWIW is 7854 and a 7104 plus maybe a 7633/7623B for those slow
PIs that benefit from storage mode.

You may prefer a 7904A over a 7104 for longevity if you use it often as
those MCP CRTs do wear out ...

Dave

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: 02 November 2016 15:05
To: TekScopes@...
Subject: [TekScopes] Advise needed - thinning the herd

I've been thinking about getting a *new* scope. Actually brand new. I've
never done that. Maybe an Agilent 2000/3000 series. (Yeah,
Keysight....I've been thinking a while now.) I have entirely too many
scopes. Mostly Tek 7000 series. About 25 of them! And I'm tired of
carrying and storing them.


But I do want to keep some analog scopes around. Maybe one or two 7000
mainframes and a good set of plugins.


The question is which two Tek 7k scopes should I have on hand? I'm not
worried about plug ins right now...that's a future project. Just the
mainframes for now. I require X-Y mode capability, but other than that it's
wide open.


What would you recommend and why?


Thanks,
-Chris






------------------------------------
Posted by: cwilkson@...
------------------------------------


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

Yahoo Groups Links

Re: tektronix 224

 

There's no readout of settings eitheri.e. the numbers att the bottom (and top) of the screen?

Qservice (no affiliation) has a Service Manual as a PDF on CD or for download

<http://www.qservice.tv/vpasp/shopdisplayproducts.asp?page=3> http://www.qservice.tv/vpasp/shopdisplayproducts.asp?page=3

Most likely, you'll need it


Raymond

Advise needed - thinning the herd

Chris Wilkson
 

I've been thinking about getting a *new* scope. Actually brand new. I've never done that. Maybe an Agilent 2000/3000 series. (Yeah, Keysight....I've been thinking a while now.) I have entirely too many scopes. Mostly Tek 7000 series. About 25 of them! And I'm tired of carrying and storing them.


But I do want to keep some analog scopes around. Maybe one or two 7000 mainframes and a good set of plugins.


The question is which two Tek 7k scopes should I have on hand? I'm not worried about plug ins right now...that's a future project. Just the mainframes for now. I require X-Y mode capability, but other than that it's wide open.


What would you recommend and why?


Thanks,
-Chris

Re: tektronix 224

oudot damien
 

with input signal or not, the spot still left of the screen. no sweep to the right, the signal does not appear. By against, on the left, if there is an input signal, there is a vertical line corresponding to the amplitude of the input signal.

Re: tektronix 224

oudot damien
 

ok do you want pic of the screen of the crt?


From: HARRIMANSAT Gullon harrimansat@... [TekScopes]
Sent: Wednesday, November 02, 2016 3:32 PM
To: TekScopes@...
Subject: RE: [TekScopes] tektronix 224



Horizontal scanning?
Can you please explain a Little more?

De: TekScopes@... [mailto:TekScopes@...]
Enviado el: miƩrcoles, 2 de noviembre de 2016 12:05
Para: TekScopes@...
Asunto: [TekScopes] tektronix 224

Hello, I just bought a used 224 tektronix. Everything works except the horizontal scanning. Can you help me? Cordially. Christophe



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





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

Re: tektronix 224

Miguel Work
 

Horizontal scanning?
Can you please explain a Little more?


De: TekScopes@... [mailto:TekScopes@...]
Enviado el: miƩrcoles, 2 de noviembre de 2016 12:05
Para: TekScopes@...
Asunto: [TekScopes] tektronix 224




Hello, I just bought a used 224 tektronix. Everything works except the horizontal scanning. Can you help me? Cordially. Christophe








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

Re: Tek 2445, test 05 fail 02

Tom Gardner
 

On 02/11/16 13:48, @cpunotfound [TekScopes] wrote:

Hi, I tried finding some X Y capacitors, as I know that the self-healing feature is a key point in their working, but I don't know how to indicate them in italian.
I wanted to buy them on the RS-components site. Can someone point me to a viable part number on this seller, so I can order it (and learn how to search them in Italian?)
For the caps in condoraudio's PDF, I used
http://uk.farnell.com/webapp/wcs/stores/servlet/ProductDisplay?partNumber=1673307
http://uk.farnell.com/webapp/wcs/stores/servlet/ProductDisplay?partNumber=2525309
http://uk.farnell.com/webapp/wcs/stores/servlet/ProductDisplay?partNumber=2525311
http://uk.farnell.com/webapp/wcs/stores/servlet/ProductDisplay?partNumber=2455939
Note the X2 and Y2 "suppression class"