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Re: From 2014: Tektronix Announces Winner of Europe’s Oldest Working Oscilloscope Contest

John Williams
 

Hi Alan very pleased to meet you. Thank you for your contributions and congratulations on your win. Umm, I was wondering if you could share the name of the anti-collection medication? Thanks. John

Re: From 2014: Tektronix Announces Winner of Europe’s Oldest Working Oscilloscope Contest

Dave Voorhis
 

On 15 Sep 2019, at 23:56, John Williams <books4you@...> wrote:

Umm, I was wondering if you could share the name of the anti-collection medication?
I bet it’s called “Angry Spouse.” :-)

Re: From 2014: Tektronix Announces Winner of Europe's Oldest Working Oscilloscope Contest

Craig Sawyers <c.sawyers@...>
 

Hi Alan very pleased to meet you. Thank you for your contributions and congratulations on your win.
Umm, I was wondering if you could share the name of the anti-collection medication? Thanks. John
I'll answer that - there is no known cure!

Craig

Re: From 2014: Tektronix Announces Winner of Europe’s Oldest Working Oscilloscope Contest

 

Even more powerful is "Angry Spouse 2.0".

On 9/15/2019 7:14 PM, Dave Voorhis wrote:
On 15 Sep 2019, at 23:56, John Williams <books4you@...> wrote:

Umm, I was wondering if you could share the name of the anti-collection medication?
I bet it’s called “Angry Spouse.” :-)


Re: 561B Recapping

Glydeck
 

I would be interested as well. — George

On Sep 15, 2019, at 1:17 PM, David Holland <david.w.holland@...> wrote:

Anyone recapped a Tektronix 561B, and have some pointers for capacitor
replacement specifications? (ESR/DF & ripple current ratings
particularly)

Looking up the Tektronix part numbers will lead to NSN numbers, which
will give original manufacturers, (Sprague/Mallory), and purported
original part numbers, that I can not find references to.

There's nothing I'm aware of specifically wrong with the scope at the
moment, other than 47 years on those caps - based on the 1972 date
codes, and a serial # in the B19xxx range.

There is also 2 (of 3) tantalum capacitors that don't seem to be
de-rated particularly well (C11 & C31). - (Yes, they look like
tantalum, the NSN's say they are tant., and their tiny physical size
strongly implies it as well.)

I've a DER DE-5000 and a HV supply (Eico 950B) so I could pull them
and measure DF/ESR/leakage/etc to my hearts content, but if I'm going
to remove them, I'd just as soon put new caps back in circuit.

Suggestions? Comments? Cries of Derision?

Thanks,

David


Re: From 2014: Tektronix Announces Winner of Europe’s Oldest Working Oscilloscope Contest

Mlynch001
 

Tom,

My wife found this very funny! She says that I need to go to the pharmacy and pick up a bottle or three. She says, flat out, "no 400 + scopes for you"!

Alan, Pleased to meet you and to finally learn of your collection and your winning the prize.

--
Michael Lynch
Dardanelle, AR

Re: Tek 576 Curve Tracer HV Transformer winding

Mlynch001
 

Success! I jacked the oven up to 350 and went for broke. My wife yelled "I smell something" so I figured it was hot enough. Gave it a twist as instructed and it popped apart. One outer leg had already fallen off, so I am thinking that the core was already cracked by the earlier attempt. No harm, no foul, super glue to the rescue.

I APPRECIATE all the advice that was given. A special thanks to Chuck Harris for his concise instructions. Now to figure out how to make and wind a new bobbin.

Sincerely,

--
Michael Lynch
Dardanelle, AR

7403N questions

Ed Breya
 

I recently picked up the cheapest 7K scope I ever got - ten bucks for a 7403N with three plug-ins, claimed to be working - but I found it to not be. For that price, I don't care. Presuming I can get it running again without too much grief, I can use the mainframe for a 7D01 or 7D20, IF there's enough juice available to run these power hogs. They make their own readouts, so the "N" (as in No readout built into the mainframe) doesn't matter. The plugs are a 7A18, 7A15A, and 7B50, all very beat up mechanically, but amazingly clean inside. I always save old plug-in carcasses to make custom units anyway, so they will go directly to the parts department. I have some questions then, on this mainframe:

1. Does the 7403N have any chance at all to properly run these big two- or three-wide plug-ins? I recall discussions regarding not having enough power in certain mainframes, so this is likely a major issue here.
2. Is it possible to field-add the readout function to this model? I think that on most higher-level "N" models, it can be fitted later, but I don't know if this one is so bare-bones that there's no provision for upgrading. I have lots of good spare RO boards and cabling, but don't know if the main interface board even has the connections available.

Ed

Re: Tek 576 Curve Tracer HV Transformer winding

ykochcal
 

My wife yelled "I smell something" so

Did someone mention that you should use an old toaster oven that is not in
the house?

John

Re: Tek 576 Curve Tracer HV Transformer winding

Craig Sawyers <c.sawyers@...>
 

My wife yelled "I smell something" so

Did someone mention that you should use an old toaster oven that is not in the house?

John
The mistake was doing something like that when SWMBO was in the house!

Craig

Re: 11801 NVRAM

Albert Otten
 

Hi Reg,

I think you refer to my message #158778. The GPIB command ccalcorrection does the job. That command was present in the CSA803A but not yet in the CSA803.This suggests that the calibration constants were introduced in the later models. So I suppose this feature is also not yet present in your 11801.

As far as I know there is no GPIB command to read memory contents. The Debug facility in the Extended Diagnostics menu can show memory contents at the scope screen; see also 11801 Diagnostics pdf, section 5.2.7. For viewing the time base NVRAM the Time Base subsystem should be selected in the E.D. menu. With Debug I could not find the GPIB commands in the firmware; probably some memory bank switching is needed to access the proper memory chips. I based my above mentioned conclusion on chip memory dumps obtained from elsewhere.

Albert

On Sun, Sep 15, 2019 at 07:59 PM, Reginald Beardsley wrote:


I'm very interested in how to derive and store the correction terms. There
has been discussion of a command to write them, but it appeared not to work
when attempted IIRC.

It would be very helpful to know where they are stored in the NVRAM. I've got
a programmer, but no idea where to put the data.

My Keysight 33622A is specified as <1 ps jitter. That's less than the 4 ps
jitter specified for the 11801. I think I'll play with that a bit and see if
I can persuade the 11801 to tell me what the uncalibrated errors are.

Having just built a GPIB-USB adapter using an Uno and AR488 I think I need to
read the programming manual for my 11801 to see if I can get digits out via
the GPIB port. That would allow removing the NVRAM one time to load the
correction values.

Have Fun!
Reg

Re: 7403N questions

 

On Mon, Sep 16, 2019 at 05:51 AM, Ed Breya wrote:

. Does the 7403N have any chance at all to properly run these big two- or
three-wide plug-ins?
The 7403N uses the same mains transformer and LV pover supply as 7603 so
I assume the power specs are the same. http://www.hakanh.com/dl/docs/hardtofind/7k_PS_currents.pdf

2. Is it possible to field-add the readout function to this model? I
Introduction info from March 1971:
//
The 7403N/R7403N are designed to be low cost additions to our present
mainframes. Both mainframes allow the use of most 7000
series plug-ins for flexibility, while maintaining a total package
cost to be favorably competitive with the HP180 Series of instruments.
The only plug-ins that may not be used in this new line are those
requiring Auto Scale Factor Readout for an output such as the 7D Series.
In the present version of the 7403N, Auto Scale Factor Readout is not
available as an initial purchase, nor can it be later added to the
instrument if desired, because of completely different circuit design.
The 7403N together with its two low cost plug-in additions, the 7A18
and 7B53N, offer a "new gen", dual trace, delaying sweep, 50 MHz
laboratory scope at a low cost.
//

There is no official mod kit to be found to do that so the above would still be valid.

/Håkan

Re: 11801 NVRAM

Chuck Harris
 

For what it's worth, the CSA803C, and the 11801C are
the same instrument, +/- two active ports for sampling
plugins, which are substituted for power only ports on
the CSA803C.

They are both covered in the 070-9970-00 Programmer Manual.

By inference, they both have the same command set, which
includes:

CALibrate <alpha> <ui> <link>: <arg>

which auto cal's the command in the argument.

With links,

AUTO: {All | Blowby | LOOpgain | OFFSet | ONUll or TDRAmplitude }

BLOwby:

CSTore: {All | Blowby | LOOpgain | OFFSet | ONUll or TDRAmplitude }

or,

DREcall: {All.....TDRAmplitude}

etc...

So, anything you can do with your CSA803A, you can do and more with
the much later 11801C....

Or, so it appears.... The Programmer Manual is about as clear as mud.

-Chuck Harris





Albert Otten wrote:

Hi Reg,

I think you refer to my message #158778. The GPIB command ccalcorrection does the job. That command was present in the CSA803A but not yet in the CSA803.This suggests that the calibration constants were introduced in the later models. So I suppose this feature is also not yet present in your 11801.

As far as I know there is no GPIB command to read memory contents. The Debug facility in the Extended Diagnostics menu can show memory contents at the scope screen; see also 11801 Diagnostics pdf, section 5.2.7. For viewing the time base NVRAM the Time Base subsystem should be selected in the E.D. menu. With Debug I could not find the GPIB commands in the firmware; probably some memory bank switching is needed to access the proper memory chips. I based my above mentioned conclusion on chip memory dumps obtained from elsewhere.

Albert

Re: 11801 NVRAM

Chuck Harris
 

Hey Reg,

Unless you actually mean an 11801, you should not
abbreviate the model number of your scope, 11801.

The 11801 is far less capable than your 11801C.
Especially in as far as GPIB programming goes.

-Chuck Harris

Reginald Beardsley via Groups.Io wrote:

FWIW I set up my 11801 using the internal trigger and feeding a ~100 kHz ramp from my 33622A. By making slight adjustments to the ramp frequency I get a straight line which intersects the graticule all the way across the screen at 5 ps/div and 2 mV/div using 5120 points and at 1 ps/div with 1024 points. The internal timebase is not as stable as the 33622A which, despite not having the high stability option, has *very* little drift relative to a GPSDO from Leo Bodnar.

I'm obviously severely aliased to get a single cycle image of a 100 kHz ramp in a 10 or 50 ps wide window. That corresponds to 10 femtosecond sampling.

If there is a time base correction that was lost I don't see how I can measure it or what effect it might have. The ramp appears dead straight though it jumps around a lot because of the 4 ps jitter of the 11801 clock. By continually fiddling with the ramp frequency I can stop the display for a single sweep with a diagonal line over the full screen from upper right to lower left when collecting 5120 points.

I'm going to puzzle over this while I fix a rather late lunch. But I can't see how there is a significant issue. I should be able to do better getting digits via the GPIB interface and supplying a trigger signal from the 33622A.

As I removed the NVRAM battery to get it to boot before I replaced the NVRAM chip, there's no question that if there were cal data in the NVRAM chip it was lost.

Have Fun!
Reg



Re: Tek 576 Curve Tracer HV Transformer winding

Mlynch001
 

My wife is not that hard to get along with. She knew what was going on and was letting me know that the core was probably ready to attempt to separate. All she wanted to know after that was “did it work?” . She is a keeper.
--
Michael Lynch
Dardanelle, AR

WTB: 214, 224 handheld scopes and accessories for others

greenboxmaven
 

Thanks to responses from others on this list, I now have a few Tektronix hand held scope projects, and looking for a few more. I would like to add a 214 and 224 to my collection. I am also looking for carrying cases or bags, as well as parts for the 2XX series. The scopes don't need to be working, I prefer to restore them. Bruce, KA2IVY

OFF TOPIC- Fluke handhelds

greenboxmaven
 

I am also interested in project Fluke "Scopemeter" hand helds. If anyone has a project or two for sale, please let me know. If anyone knows of a group similar to this one but devoted to Fluke, please let me know about it as well. Thanks, Bruce KA2IVY

want to buy 4S3

Brian
 

Hi everyone , I would like to buy or maybe trade for a 4S3 plug-in . I dont mind if it is non-functional or even if it has no probes with it , it is the one part of my 661 system that I have not been able collect yet .

thanks in advance for any help

3.5mm connector for SD24 sampling head...

Chuck Harris
 

Hi,

I have an SD24 sampling head that is otherwise ok, but has a
3.5mm connector that was banged into a wall by the previous
owner. The connector leading edge is peened over a little bit.

Finding a new connector seems unlikely.

Does anyone out there have a parts unit SD24 or 26 that has a
spare connector?

Thanks!

-Chuck Harris

PM for a working Tek 577 with D1 storage Curve Tracer

Kevin Oconnor
 

There has been frequent postings on various repairs for broken 577 CTs. However, mine is working ok, given its age and typical senior citizen arthritis issues.
I don’t want to fix what ain’t broken, but it would be nice to have a list of:
1) must do - or it will explode
2) should do
3) when you have the time do

My 577 issues are buttons that don’t want to latch, pots that are scratchy, display zero moving around with selector setting changes. All things that I can live with.

Kevin KO3Y