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Re: TDS520 Option 13

Artekmedia <manuals@...>
 

I have no idea... I have never seen a copy

Maybe you should try  your friend at the chat desk

-DC

On 1/5/2018 4:48 PM, jafinch78 . wrote:
On Fri, Jan 5, 2018 at 12:48 pm, Artekmedia wrote:

070-8567-00
Does 070-8567-00 contain schematics?


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


Re: TDS520 Option 13

jafinch78 .
 

On Fri, Jan 5, 2018 at 12:48 pm, Artekmedia wrote:


070-8567-00
Does 070-8567-00 contain schematics?


Re: Source of manuals either .pdf or hard copy

Malcolm Hunter
 

Hi Paul,



On 5 January 2018 at 21:30, <pauledst@gmail.com> wrote:

I'm looking for manuals for my model 506 oscilloscope. It's a member of
the 561 family and somewhat uncommon. It uses 9 series plugins and some 3
series ( I already have all the 3 series ones.) Any help is appreciated.

Paul
​Did you check out the service manual at
http://w140.com/tek_506_Manual_070-445_Aug_1964.pdf ? Interesting, it's the
same age as me.

Malc


Re: Source of manuals either .pdf or hard copy

Brian
 

Hi Paul , the BAMA archive has a pdf of the 9A1


Source of manuals either .pdf or hard copy

pauledst@...
 

I'm looking for manuals for my model 506 oscilloscope. It's a member of the 561 family and somewhat uncommon. It uses 9 series plugins and some 3 series ( I already have all the 3 series ones.) Any help is appreciated.

Paul


TDS520 Option 13

Artekmedia <manuals@...>
 

For option 13, the TDS520 Service Manuals is once again quite clear on this.

_*Option 13: RS232/Centronics Hardcopy Interface*_

With this option , Tektronix ships the oscilloscope equipped with a RS-232 .
and a Centronics interface that can be used to obtain hardcopies of the oscilloscope screen.
For service information, refer to the /*TDS  Family Option 13 RS-232/Centronics Interface*//*
*//* Instruction Manuals*/, Tektronix part number 070-8567-00

-DC
manuals@artekmanuals.com





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


Re: TDS-520

jafinch78 .
 

On Fri, Jan 5, 2018 at 10:55 am, Raymond Domp Frank wrote:


all modules in the 'scope (from A10 up) are present in Volume 2
I wasn't sure if all the option boards data was present though, at least the Option 13 which I don't have isn't. Option 1M appears present. I wonder where the Option 13 board schematic is found?

I've been reading the VGA and RS232 can be made by soldering onto the A11 board. I'm not thinking a RS232 to TTL USB is needed since I'm thinking the chips on the A11 board would output in RS232 standard from that era. Would be interesting though to have the module to convert to USB since I read all are RS232. That would be a novel hack/mod. for an auto calibration/performance verification to be logged into an audit trail app.

I still have to figure this out... though the VGA may be from somewhere around or on J5. Maybe down the line further where the CRT connects, though a CRT to LCD converter video card may be needed then.

I'm not sure where the pinouts would be for the RS232 yet.

Thanks everyone!


Re: TDS-520

jafinch78 .
 

On Fri, Jan 5, 2018 at 10:38 am, Raymond Domp Frank wrote:


0 Ohm in reality does not exist:
I wasn't sure also if there is some limit for calling 0 Ohm... zero. Like are the lowest resistors 0.00001 Ohm?

I might of been having one of those invalid thought moments with the Ohm's Power Law's too.

I was also thinking with temperature maybe the material used changes resistance. Like some sort of RTC, NTC or Thermal Coefficient effects.

I like the jumpers idea somewhat to get some more versatility potential out of these scopes.

I'm still reading into the potential with the TDS-520 board(s) and stock components. I haven't even gotten into spec'ing all the different chips out to see what others can be used to like the Tektronix support noted "Frankenstien" the scope out. :-).

Looks like option 1M can be implemented with 128k SRAM chips replacing the 32k on the A11 board and maybe the 8k on the A10 board to at least 32k or maybe even 128k. I'm wondering if who had this before me was experimenting with removing the resistors to see what model configuration potential there was. I'm thinking the firmware is going to be limiting this also.

Thanks for clarifying Raymond!


Re: TDS-520

 

I would not be surprised if there never was a "Component Level Diagnostic and Repair Manual, Volume 1". I have a "Service Manual, Volume1", ref. # 070-8312-01. My Component Level Diagnostic and Repair Manual is ref. # 070-8313-00.
Looking at the Block Diagram (in my manual page 171, first page in chapter Schematics), all modules in the 'scope (from A10 up) are present in Volume 2.

Raymond


Re: Tek 2465b with down shifted display..

Siggi
 

On Fri, 5 Jan 2018 at 11:59 Mark Hatch <mark2382@hotmail.com> wrote:

The spec for ripple has the typical p-p spec. But there is also a column
that is at 2x line frequency. Does that mean I just increase the sweep
speed (manual says 5ms for p-p total) ? Sorry, first I seen of this spec.
This is what the line trigger is for - you trigger on the line at a sweep
speed of 1-2ms/DIV. Any switching ripple will either average out
altogether, or show up as fuzz on the main trace. I believe all ripple
measurements are under 20MHz bandwidth limit.


Re: TDS-520

 

0 Ohm resistors 1%, 0.125W, TC=100PPM, 1206, T&R
I "loved that" because several parts of a spec like that make no practical sense, even though 0 Ohm in reality does not exist:

- In a 0 Ohm resistor, even with 3217% tolerance, the resistance will still be 0 Ohm for all units produced. If a manufacturer would want to specify a maximum (real) resistance, it cannot be expressed as a percentage of 0 Ohm.
- In a 0 Ohm resistance, power dissipation will *always* be 0 W.
- A 0 Ohm resistance, even with a TC of 2527875 PPM, will *always* be 0 Ohm.
- A 0 Ohm resistor is unusable as a "weakest link", like a fuse, because power dissipation is what blows fuse and power dissipation in a 0 Ohm resistor is always 0 W.

In this case, when used as a solderable link on a PCB, only size (1206) matters. Sometimes, "0 Ohm" resistors are used as interruptible links for service purposes to (temporarily) isolate parts of a circuit or even more seldomly as jumpers to avoid a complex via layout

Raymond

These resistors are often used as solderable jumpers for configuration purposes


Re: Does anyone know what this does: 067-1178-99 INPUT/NORMALIZER/PROBE CALIBRATOR

Adrian
 

Bit outside my knowledge - but is it possible that it is 'stand alone' for probes (it seems to have a couple of BNCs and a probe tip connector after all!) and only needs the 'head' when used on the amp inputs because you don't want any cable capacitance?

Just a thought from looking at the pix

Adrian

On 1/5/2018 4:59 AM, Ed Breya via Groups.Io wrote:
There are some pictures on tekwiki. I vaguely recall that this unit was brought up for discussion recently (past few months), and that someone replied that it won't do much without the "head," mentioned on the front panel connections. If the head is included, then try it out on a scope input and see what it does. It looks like it's mostly a digital capacitometer of some sort, for measuring probe or scope input capacitance and deviation around the nominal value, which may be set internally to various common input Cs. I'd guess that the nominal setting was switch-selected (or adjusted against a reference C) from a number of values according to the range of scope/probe models to be tested, and the Dymo label on the front was a reminder/indicator of the internal setting.

Ed


Re: Does anyone know what this does: 067-1178-99 INPUT/NORMALIZER/PROBE CALIBRATOR

Ed Breya
 

Maybe you can try the "probe" mode measurement and plug a probe tip into the socket and see if it reads anything, or has a signal present. If the guts aren't too complicated, you can probably reverse-engineer it enough by inspection, to get an idea of what it's supposed to do, and what might be in the head. Check the LEMO to see if any DC supplies are present. If not, then the head likely had no active circuitry, so all the smarts would be in the plug-in.

I'd guess that it's a source-measure or bridge type, set up to read the C of only what's past the BNC on the head. There should be a test frequency to drive the DUT, and a current transformer to send the C signal back to the plug-in. Or, it could have an oscillator in the head, with the unknown C part of the resonant or timing circuit. It should be pretty easy to see which method is used - look for a test signal on a line in the LEMO connector. The same should apply to the probe tip connector - as mentioned above, hook the probe to a scope and look for a test signal.

Ed


Re: Tek 2465b with down shifted display..

Mark Hatch
 

Going to crack open the case this weekend and first check the power supplies.

The spec for ripple has the typical p-p spec. But there is also a column that is at 2x line frequency. Does that mean I just increase the sweep speed (manual says 5ms for p-p total) ? Sorry, first I seen of this spec.

Mark


Re: Tek 2465b with down shifted display..

Harvey White
 

On Thu, 04 Jan 2018 14:00:56 -0800, you wrote:

Hi,

Good suggestion on the video. I suspect this might help....

https://youtu.be/KGj_ssJxkEA

Let me know if you cannot see it, this is my first time trying to publish on youtube!

One thing I did notice after looking at the final video. As you move channel 1 down, the wave form gets smaller, until just almost the bottom, where it gets larger again... Not sure what that implies.
There's a behavior I remember when dealing with op amps. I'm not
going to get the proper name correct but I'll try to describe what
happens. First a basic or so:

1) any amplifier (op amp included) has a maximum output range. For
some amps this includes the supply rails, so if fed from +/- 15, then
the amp can output a 15 volt peak (30 volt p-p) sine wave without
distortion. Any more and you start getting distortion because the amp
simply can't go there.

The venerable 741 is capable of going only within 1.5 volts of the
supply rails.

2) if you exceed the common mode range of the amplifier, it starts to
mirror the inputs in an odd manner. The output goes inverted
somewhere. (As I remember it).

so, conclusions:

1) check the power supplies
2) it looks as if the +/- supplies driving at least one stage are low.
I don't think it's necessarily the output stage, but you're getting
the inversion where the output drops below a threshold at the bottom
and you get the trace starting to grow in amplitude.
3) I am guessing that the output stage is ok, because if it had a
lower voltage (significantly) then regardless, it couldn't go below
that lower clipping limit.
4) I suspect that an earlier stage has the problem.
5) check the power supplies again

(seriously, I've chased a problem around a bit then decided to check
the supplies, they were out)

First rule of equipment: Power supply tolerances are not a joke, if
the supply is not correct, then something is not going to work well.

Guessing on the scope, but at least it's something to think about.

Harvey




And the jitteriness of the display implies LV power supply problems, correct?

Cheers,

Mark



Re: Tek 2465b with down shifted display..

Siggi
 

On Thu, 4 Jan 2018 at 17:01 Mark Hatch <mark2382@hotmail.com> wrote:

Hi,

Good suggestion on the video. I suspect this might help....

https://youtu.be/KGj_ssJxkEA

Let me know if you cannot see it, this is my first time trying to publish
on youtube!

I see it, great video, you should be in movies. Love the peek of your
workshop/lab in the background :).


One thing I did notice after looking at the final video. As you move
channel 1 down, the wave form gets smaller, until just almost the bottom,
where it gets larger again... Not sure what that implies.
I haven't seen pics or video of other U400 or readout switching failures,
but I'm guessing there's wonky bias or other kinds of failure on both sides
of the diff signal, so you're going into compression or inversion on the
positive or negative depending on the trace position.
Does anything change at all if you turn the readout off?

You might want to try and re-seat U400 before you do anything else. A touch
of DeOxit or the like on the pads might also be good. My 2467 misbehaved in
all kinds of ways until I'd cleaned and re-seated the various hybrids. It's
not likely the problem here, but it's quick and easy to do and the contacts
are known to develop problems.



And the jitteriness of the display implies LV power supply problems,
correct?
Not necessarily, it looks to me that the readout only jitters when you have
a large-ish signal on CH1. There is a readout jitter adjustment, so this
might be working normally, except provoked by your other failure.

A quick thing to look at is to look at grounded traces with the line
trigger. If your main reservoir caps are gone or going, you'll see a 120Hz
wobble on the traces - use the vertical position controls to position the
traces to both extremes. To see whether there's switching ripple on the
secondaries is a little harder, though you could trigger on a
high-frequency signal, and then play with the holdoff to try and
synchronize to the LV switching frequency.

Once you have the case off, it'd be prudent to look at the supplies on J119
and see where you stand - all of this might be nothing more than a bad
supply. The channel switch runs from +5V and -5V by the looks of it, and
each of those is derived individually from the 10V reference. Could be that
e.g. one of those supplies is in current limiting.


Re: Does anyone know what this does: 067-1178-99 INPUT/NORMALIZER/PROBE CALIBRATOR

 

Hi Ed,
Thanks for the mention about TekWiki. I see the head in one photo. My unit has a LEMO connector where the captive head on one photo on TekWiki shows. I don't have a head so I guess it’s a shelf trophy until I learn more about what the head did or how to duplicate one.

I found it mentioned in the archives. Unfortunately it was mostly me asking, in vain, if anyone had any info on this.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Ed Breya via Groups.Io
Sent: Thursday, January 04, 2018 8:59 PM
Subject: Re: [TekScopes] Does anyone know what this does: 067-1178-99 INPUT/NORMALIZER/PROBE CALIBRATOR

There are some pictures on tekwiki. I vaguely recall that this unit was brought up for discussion recently (past few months), and that someone replied that it won't do much without the "head," mentioned on the front panel connections. If the head is included, then try it out on a scope input and see what it does. It looks like it's mostly a digital capacitometer of some sort, for measuring probe or scope input capacitance and deviation around the nominal value, which may be set internally to various common input Cs. I'd guess that the nominal setting was switch-selected (or adjusted against a reference C) from a number of values according to the range of scope/probe models to be tested, and the Dymo label on the front was a reminder/indicator of the internal setting.

Ed




--
Dennis Tillman W7PF
TekScopes Moderator


Re: Does anyone know what this does: 067-1178-99 INPUT/NORMALIZER/PROBE CALIBRATOR

Ed Breya
 

There are some pictures on tekwiki. I vaguely recall that this unit was brought up for discussion recently (past few months), and that someone replied that it won't do much without the "head," mentioned on the front panel connections. If the head is included, then try it out on a scope input and see what it does. It looks like it's mostly a digital capacitometer of some sort, for measuring probe or scope input capacitance and deviation around the nominal value, which may be set internally to various common input Cs. I'd guess that the nominal setting was switch-selected (or adjusted against a reference C) from a number of values according to the range of scope/probe models to be tested, and the Dymo label on the front was a reminder/indicator of the internal setting.

Ed


Does anyone know what this does: 067-1178-99 INPUT/NORMALIZER/PROBE CALIBRATOR

 

I have an 067-1178-99 INPUT / NORMALIZER / PROBE CALIBRATOR TM500 plugin
and I have always been curious about what it does.

I'm hoping a member of TekScopes might know how it works, or have a manual
or an explanation of how to use it.

It looks like it was used in the field offices. The PC Board is typical
professional Tek quality.

The board was designed in 1984. I am guessing from a part date code that
this particular one was made in 1987.

It has a 19 position bar graph made of discrete LEDs on the front.



Dennis Tillman W7PF


Re: White Plastic side panels for 7K mainframe interface

s92187
 

Do you still have these available? If so I'd like to buy one from you.
Terry

37981 - 38000 of 181310