---

From: Don Black
To: TekScopes@...
Sent: Tuesday, March 12, 2013 10:23 PM
Subject: Re: [TekScopes] a note for USA residents buying from Walter at Sphere

You don't actually say what your complaint is but it obviously upset you. 'nuff said from me about that.
However for sending money from here (Australia) internationally Paypal is the only economical option. If I use a bank transfer or any of the other financial systems their fees can be more than the item cost, depending on circumstances perhaps $30.00 to send as much. Paypal would cost about $1.00 for the same and the recipient has the money in their account in seconds. I have no particular love for or against Paypal but for me it works fine, plus it's an extra firewall between my bank and the outside world, comforting if I'm sending to Russia, China, etc. (and there are plenty of nasty people closer to home too.

Don Black.

Can you see the position of the intensity knob in the auction photos?

DaveD


On 3/12/2013 11:12 AM, ehrico wrote:

Hello everyone,
a seller on ebay is selling a tek 577 with a fault, he/she is not
fully 100% sure it is the crt. I can't afford a working one but am
willing to restore one that is restorable(with undead crt):)
So I have provided to 2 links to pics in my imgur account. The second
one they must have turned the intensity and or brightness full up?

pic 1 <> and pic2
<>

Is it a CRT problem or a problem with deflection circuitry etc...?

Anyway my name is Richard and I have been lusting after a Tek 577/6
curve tracer for a while. If I lived in the USA I would probably have
one by now, but I live the UK

Thanks for any help.

Richard

He seems to have made this from an old plug-in and one of the TEK_7K_FLEX kits. Then made a very useful looking front panel.

I'm just about to go down this route as Tony Sedivy has kindly given me a couple of these kits.
Until you pointed out this eBay item, I was a bit unsure how to tackle building it, preferring to make a rigid extender but not knowing how to make the supportive near end.

The wizard works on my 2232...this was typical of the Tektronix of old,
who at least in the background, viewed that this type of frivolity had
at its core learning and experimentation that led to real features and
future advance of the art of technology. It was also a crowd gatherer at
the booth for the sales guys at the trade shows.

Another example of this non traditional view of engineering creativity
is that at one time Tek engineers were allowed to take home factory
parts for home projects with the underlying belief if that you were
tinkering at home you might stumble onto a new application or design
that would come back to work

Dave
ArtekManuals.com

On 12/16/2012 5:22 AM, Albert wrote:

I think to remember that this has been mentioned here before, it being
secret jokes of Tektronix engineers. A modern variant of the mountain
climber trying to reach the top of the CRT in some old 500 series
schematics.

Albert

--- In TekScopes@... <mailto:TekScopes%40yahoogroups.com>,
"mikehostalek" <mikehostalek@> wrote:

_____I recently bought a Tek 2232 on ebay, (havent got it yet)
while searching the net for a manual (ill upload it after my slow
connection gets is downloaded), I came across this:

<img src=">
i'm not sure if my html is right, (it's been awhile), so here's a link
Wizzard Skatin' across your scope
<>

supposedly you can make the 2232 display this by:

1. turn the scope on
2. push the "ADV FUNKT" button once
3. push the "SAVE REF. 3" two times
5. move the "CURSOR"
6. now you have reached the so called "secret menu" here you cansee a
wizzard on a scateboard or the "TECTRONIX" logo or you can clearall
memories.

this seems like one of those things that while pointless, is still
pretty cool, if it works.

I'd call it really low risk but keep in mind there are those out there
who like to give misinformation,
its possible (far as i know) yet unlikely, that theres some glitch where
doing the steps above could do something bad to the scope. If anyone has
one and is willing to try it, let me know if it works. if not, ill try
it in a few days or so when i get mine.

--
Dave Henderson
Manuals@...
www.Artekmanuals.com
PO Box 175
Welch,MN 55089
651-269-4265

From: sbirdasn <sbirdasn@...>
Subject: [TekScopes] Re: Sony/Tektronix 318 manual with full schematic
To: TekScopes@...
Date: Wednesday, March 13, 2013, 6:32 AM

?

Comments inline...

--- In TekScopes@..., Gala Dragos wrote:
>
> I have that manual, I cannot find half of A02 board.

You're right! page <4> is missing! The doc looked pretty good to me when I first looked at it. ;)

That being said, my dead-tree version that is truly complete has the following circuits:

1) External clock input buffer with its threshold comparator/delay circuit.
2) Internal/external clock select logic.
3) Some buffers for qualifiers.
4) Threshold buffer amplifiers for the pods.
5) The signal routing to get one pod connector's differential signals to the interconnect header for the A01's differential to ECL signal w/ glitch detection circuits. (one pod is handled on A01, one pod on A02)

For the problems you're experiencing, it probably won't help much, if any.

> The full symptoms are these:- 20ns clock??disappeared;- there are 4 selectable groups in the setup screen;- each group has 16 bits available for display;- only 2 pods can be selected for input (pod A and pod B), the rest are unavailable;

By that, I think you mean that groups 3 & 4 are disabled by default, and you can only enter signals A0-7 or B0-7 into groups.

Correct?

> - all tests pass, including acq and sram;- the pods are capturing external signals properly (checked them with the available calibration output);

This would imply that upon power-up, it *does* ID itself as a 318.

> I have noticed that the instrument can be "used" without the??acquisition??board, albeit you can only browse the menus.

Not surprising, since much of the hardware is write only or limited in how the CPU can interact with it.

> Excerpt from the manual:??"The chip select latch (A04U114) is used to enable each 8-bit pair of the acquisition memory and for identifying instrument type. It is written by the MPU with the WRITE BS signal from the A03 ACQ Control board."

> I have checked that circuit for continuity of traces and they are all ok. On the schematic there is a jumper wire called W118 which in the 338 is mounted and in the 318 is not mounted, checked that as well and it is not mounted.

Since you've checked the signal connections, it sounds like a hardware failure in one or more chips.

Consider the following (I have no idea how they wrote the firmware, so I have to make some educated guesses):

The Bank Select pin used for Type ID is "wire-OR'ed" with the ACQ/Glitch Memory output data bus, which has pull-up/termination resistors to bring the bus to a known inactive state.

Since the 318 has the jumper removed, then when the ID bank bit is driven active, the signal to be read *should* be in the "inactive" state.

If one of the ACQ/Glitch SRAM's were to drive this pin to a "active" state, then the bit will be incorrectly read (there is also some status bits that are selected by the 2-1 muxes, so something could be wrong there too).

When would this happen?

Apparently, not on power-up, as it knows to be a 318 for pod count and memory to test.

But perhaps when you enter the Trigger menu and start moving the clock rate, then the firmware *might* check the hardware jumper state again, read the wrong information, and prevent selecting the highest clock rate.

This is just a guess, but it would be easy to check-

Solder a jumper wire onto the W118 pad on the latch side for probing with a scope, and check for activity by the CPU to drive it active (to read the ID TYPE). The signal will be fairly slow, as it is driven active across several instructions, and thus will be in the micro-second range, unlike the sampling circuitry. Not an ideal situation for signal integrity, but then I doubt you have a pair of extender cards handy (made of unobtanium).

I think the signals in this area are ECL, so the logic transition delta is about 0.8V between 1's and 0's, and does not go to either "ground" or V- (ECL is technically a -5.2V logic family).

Explore the operation of the analyzer, and note when the signal goes active. Try various menus, field changes, etc. to see when the CPU fiddles with this signal. You might also look at when the Bank Select Latch is clocked too.

You could check some other signals from the bank latch and the read side as sanity checks if necessary.

I can't think of any other explanation as to why you can't select 20 nS clock.

Good luck.

Sbirdasn.

?

I've never used them but the cheap probes are available up to several hundred MHz (250-300?) for a bit more money. Has anyone tried them and know how good or bad they are above 100 MHz. It may be more demanding on fast pulses rather than sine waves.

Don Black.

On 13-Mar-13 5:28 AM, Dan Rae wrote:

?

On 3/12/2013 11:13 AM, anson_williams@... wrote:

Thanks Bob. I forgot the link though in case anyone wants to take a look.


      I purchased a pair of these probes for my 475 just because I really couldn't afford anything else. My question is will i ahve any issues with these on the 475?

They are quite useful but not by any means perfect for any Tek scope that requires the read out pin which these lack.? That said, I use them with my SC502 and the switchable ones all the time with my counters that have a 1 meg Ohm input.? They are only rated to 100 MHz nominally which is another draw back for use with the 475.

Also the witches hat that came with mine will fit some of the Tek probes.? For $15 a pair they're worth getting.

Dan

Bob,

I have a 7B53A with bad switches that I am scraping. I can send you the working 155-0049-02 for $5 plus shipping[$2.06?].

send me your address and it will go out this morning. paypal j_massengale@...
$7.10





Jerry Massengale






-----Original Message-----
From: Bob <b46nelson@...>
To: TekScopes <TekScopes@...>
Sent: Mon, Mar 11, 2013 7:59 pm
Subject: [TekScopes] 155-0049-02 for 465 scope





I beleive I need a 155-0049-02 chip to fix the sweep issue with my 465 scope. Anyone know the best place to locate one????

From: Don Black <donald_black@...>
Subject: Re: [TekScopes] Re: Cheap Probes
To: TekScopes@...
Date: Tuesday, March 12, 2013, 8:45 PM

?

I've never used them but the cheap probes are available up to several hundred MHz (250-300?) for a bit more money. Has anyone tried them and know how good or bad they are above 100 MHz. It may be more demanding on fast pulses rather than sine waves.

Don Black.

On 13-Mar-13 5:28 AM, Dan Rae wrote:

?

On 3/12/2013 11:13 AM, anson_williams@... wrote:

Thanks Bob. I forgot the link though in case anyone wants to take a look.


      I purchased a pair of these probes for my 475 just because I really couldn't afford anything else. My question is will i ahve any issues with these on the 475?

They are quite useful but not by any means perfect for any Tek scope that requires the read out pin which these lack.? That said, I use them with my SC502 and the switchable ones all the time with my counters that have a 1 meg Ohm input.? They are only rated to 100 MHz nominally which is another draw back for use with the 475.

Also the witches hat that came with mine will fit some of the Tek probes.? For $15 a pair they're worth getting.

Dan

I purchased a pair of these probes for my 475 just because I really couldn't afford anything else. My question is will i ahve any issues with these on the 475? They seem to work reasonably well They pick up good traces from the calibrator and a small 555 based square wave and triangle wave generator and I also have the AVR clock kit and that works well also. But if and when I get into more advanced uses will I need better probes? And what is really the difference between these and say a P6106? Thanks for any info.



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

Yahoo! Groups Links

?

On 3/12/2013 11:13 AM, anson_williams@... wrote:

Thanks Bob. I forgot the link though in case anyone wants to take a look.
      
      
      I purchased a pair of these probes for my 475 just because I really couldn't afford anything else. My question is will i ahve any issues with these on the 475? 

They are quite useful but not by any means perfect for any Tek scope that requires the read out pin which these lack.? That said, I use them with my SC502 and the switchable ones all the time with my counters that have a 1 meg Ohm input.? They are only rated to 100 MHz nominally which is another draw back for use with the 475.

Also the witches hat that came with mine will fit some of the Tek probes.? For $15 a pair they're worth getting.

Dan

?

I purchased a pair of these probes for my 475 just because I really couldn't afford anything else. My question is will i ahve any issues with these on the 475? They seem to work reasonably well They pick up good traces from the calibrator and a small 555 based square wave and triangle wave generator and I also have the AVR clock kit and that works well also. But if and when I get into more advanced uses will I need better probes? And what is really the difference between these and say a P6106? Thanks for any info.

?

Hi all

No matter what some of us may think, Canada still isn't our 51st state.

Recently, Walter at Sphere made me an extremely generous deal on a manual, and asked for either a USPS international money order in payment, or PayPal with a surcharge sufficient to cover PP's rapacious fees.

What I found was -- the current fee for a USPS international money order is USD$4.50, and postage from the states to Canada is $1.10. Walter asked for a 7% PayPal surcharge. In my case, it would have been much cheaper to pay that surcharge, much as I hate PayPal. They're not my pal, friend; they're not my friend, buddy; they're not my buddy, pal. (with apologies to "South Park")

Your mileage may vary, especially as the dollar amount of the transaction rises, but I suggest that you work the numbers before you go to the post office.

Now, usually I do not mind a trip to the post office -- I telecommute to work 99% of the time, and it's a refreshing break to go to the PO. Most times, I meet some interesting people there.

However, yesterday? Not quite so much. If I have a chance to go to the PO today, I'm going to lodge a formal complaint against one of the workers who confronted me -- I cannot say "helped" -- because he was about as useful at actually providing my requested services as Neville Chamberlain was at ending World War 2.

Maybe I can get him fired.

All monetary things being equal, my disgust with PayPal was dwarfed by overweening frustration and dismay with that one Postal Service waste of oxygen employee. He made it truly a challenge for me to be civil to the other dedicated postal workers who DID take care of this situation for me.

Anyway, check prices for cross-border financial services first. It may be that the oft-reviled evil empire of PayPal is a better deal than USPS.

73 and have a nice day
Jim N6OTQ