Date   

Re: Ferrite Beads in Tek Transistor Adapters

Glydeck
 

Chuck,

Totally agree! So does having or not having a basic education.

Staying on topic, the ferrite beads work well for building your own test fixtures.

George

On Jul 25, 2020, at 8:02 AM, Chuck Harris <cfharris@...> wrote:

Votes have consequences.

Glydeck via groups.io wrote:
You should click on The link “Why is this here” on the All Electronics page. This would be the reality of good intentions gone wrong and ultimately becoming useless.

“As of August 2018 the State of California has changed the requirements of the "Prop 65" law. We now must list on our website any possible chemicals the can cause cancer, birth defects or reproductive problem.
To put it simply we are a small company and do not have the resources to test every single part, so we list every thing as hazardous. Please recycle all electronic parts responsibly and under no circumstance eat, drink or smoke these parts and wash your hands after touching!”
On Jul 25, 2020, at 7:11 AM, Michael W. Lynch via groups.io <mlynch003=yahoo.com@groups.io> wrote:

On Fri, Jul 24, 2020 at 09:30 PM, Dave Seiter wrote:


I can say that it's mind-numbingly inane. Everything is potentially toxic or
dangerous- it's just a matter of quantity/frequency (drinking too much water
can kill you, you can be crushed by cabbages, anaphylaxis from cat hair, etc)
This is why we have "Warning" labels on Preparation H that states "not to be taken orally".

--
Michael Lynch
Dardanelle, AR






Re: Ferrite Beads in Tek Transistor Adapters

Chuck Harris
 

Votes have consequences.

Glydeck via groups.io wrote:

You should click on The link “Why is this here” on the All Electronics page. This would be the reality of good intentions gone wrong and ultimately becoming useless.

“As of August 2018 the State of California has changed the requirements of the "Prop 65" law. We now must list on our website any possible chemicals the can cause cancer, birth defects or reproductive problem.
To put it simply we are a small company and do not have the resources to test every single part, so we list every thing as hazardous. Please recycle all electronic parts responsibly and under no circumstance eat, drink or smoke these parts and wash your hands after touching!”
On Jul 25, 2020, at 7:11 AM, Michael W. Lynch via groups.io <mlynch003=yahoo.com@groups.io> wrote:

On Fri, Jul 24, 2020 at 09:30 PM, Dave Seiter wrote:


I can say that it's mind-numbingly inane. Everything is potentially toxic or
dangerous- it's just a matter of quantity/frequency (drinking too much water
can kill you, you can be crushed by cabbages, anaphylaxis from cat hair, etc)
This is why we have "Warning" labels on Preparation H that states "not to be taken orally".

--
Michael Lynch
Dardanelle, AR





Re: Ferrite Beads in Tek Transistor Adapters

Glydeck
 

You should click on The link “Why is this here” on the All Electronics page. This would be the reality of good intentions gone wrong and ultimately becoming useless.

“As of August 2018 the State of California has changed the requirements of the "Prop 65" law. We now must list on our website any possible chemicals the can cause cancer, birth defects or reproductive problem.
To put it simply we are a small company and do not have the resources to test every single part, so we list every thing as hazardous. Please recycle all electronic parts responsibly and under no circumstance eat, drink or smoke these parts and wash your hands after touching!”

On Jul 25, 2020, at 7:11 AM, Michael W. Lynch via groups.io <mlynch003=yahoo.com@groups.io> wrote:

On Fri, Jul 24, 2020 at 09:30 PM, Dave Seiter wrote:


I can say that it's mind-numbingly inane. Everything is potentially toxic or
dangerous- it's just a matter of quantity/frequency (drinking too much water
can kill you, you can be crushed by cabbages, anaphylaxis from cat hair, etc)
This is why we have "Warning" labels on Preparation H that states "not to be taken orally".

--
Michael Lynch
Dardanelle, AR



Re: Ferrite Beads in Tek Transistor Adapters

Stephen
 

On Sat, Jul 25, 2020 at 03:11 AM, Michael W. Lynch wrote:

This is why we have "Warning" labels on Preparation H that states "not to be
taken orally".

--
Michael Lynch
Dardanelle, AR
😂😂😂


Re: Ferrite Beads in Tek Transistor Adapters

Michael W. Lynch
 

On Fri, Jul 24, 2020 at 09:30 PM, Dave Seiter wrote:


I can say that it's mind-numbingly inane. Everything is potentially toxic or
dangerous- it's just a matter of quantity/frequency (drinking too much water
can kill you, you can be crushed by cabbages, anaphylaxis from cat hair, etc)
This is why we have "Warning" labels on Preparation H that states "not to be taken orally".

--
Michael Lynch
Dardanelle, AR


Re: Ferrite Beads in Tek Transistor Adapters

Dave Seiter
 

As a former environmental compliance guy in CA, I can say that it's mind-numbingly inane. Everything is potentially toxic or dangerous- it's just a matter of quantity/frequency (drinking too much water can kill you, you can be crushed by cabbages, anaphylaxis from cat hair, etc) 
At some point, all the warnings become meaningless, kind of like advertising (which I ignore and remove whenever possible).  The nanny state at it's finest, thanks mostly to lawyers...
OTOH, it might be nice if older Tek scopes had warnings about weight (don't try to pick up a 519 if your back has been acting up!)
-Dave

On Sunday, July 19, 2020, 06:35:20 PM PDT, Carsten Bormann <cabocabo@...> wrote:

On 2020-07-20, at 03:20, Chuck Harris <cfharris@...> wrote:

Everything is known to cause cancer in the state of
California.... Makes me glad I don't live there.
They say:


Why is this here?
As of August 2018 the State of California has changed the requirements of the "Prop 65" law. We now must list on our website any possible chemicals the can cause cancer, birth defects or reproductive problem.

As an example:
    • ABS plastic contains styrene
    • PVC wire insulation can contain Di(2-ethylhexyl)phthalate (DEHP)
    • electrolytic capacitors can contain Ethylene glycol
    • Brass can contain Lead
    • flame retardant pc boards can contain Tetrabromobisphenol A (TBBPA)
    • Aluminum alloys can contain Chromium

To put it simply we are a small company and do not have the resources to test every single part, so we list every thing as hazardous. Please recycle all electronic parts responsibly and under no circumstance eat, drink or smoke these parts and wash your hands after touching!


Typical cop-out created by non-thinking regulation.
But I generally agree with the advice not to try smoking ferrite beads.

Grüße, Carsten


Re: 485 Cordwrap Feet

Roy Thistle
 

On Thu, Jul 23, 2020 at 12:10 PM, Michael W. Lynch wrote:


The cordwrap feet are also handy for when you do not need the entire cord
length, but want to have the instrument plugged in.
Feet on any of these series of Tek with bale handles (like on a 475)... are a blessing, and a curse when they rot! I often have to store them horizontally... and that's when the feet fail! (Foot rot failure [ and retrofit feet] are a well known and much discussed topic on TekScopes... I'm just saying, I wish I had intact ones on everything.) Nope.. won't pay even 20.00 for feet.


FS Tek C30 camera

Phillip Potter
 

Hi all,
I have a Tektronix C30 camera that I would like to sell. I'm asking $30 + shipping

Will consider offers. PLEASE REPLY OFF LIST!

Thanks,
Phil


More goodies uploaded to the Sphere Stuff Day event on line.

 

Just added all kinds of Tek, HP, Boonton, Narda and HP items to the site, as well as lots of unusual semiconductors and parts. Also a beautiful ESI 295 digital capacitance bridge. Drop by over the weekend and look around, it's like a virtual surplus store adventure on line. A nice change from Netflix.

https://www.sphere.bc.ca/test/stuffday.html

Still have some tek 465M timebases, 7B53A's and a very sexy 2216 quad trace digital scope. There's still a few free Kk and 7K plug-ins left to add to orders on request, and I found a partial 11K high speed 50 ohm vertical with the 2 front end vertical relay attenuators in it, can be free for the first person that asks for it (off-list, please!).

We are off to look at an estate sale Aug 1 that has a LOT of tek plug ins, some 2/3 series and 5K/7K.. no idea yet what the cost will be, but we will try and round up some good ones, and pass them along as cheaply as we can to anybody interested.

Be safe over the weekend!
all the best,
walter (walter2 -at- sphere.bc.ca)
sphere research corp.


Re: Dead TM500 plug-in sought

 

Colin,

I can send you the TM500 frame parts and a rear mating connector PCB free if you can cover the
padded bag shipping cost the the UK. email me off list at:
walter2 -at- sphere.bc.ca

regards,
walter
sphere research corp.


Re: Dead TM500 plug-in sought

Jim Ford
 

Something like this: w140.com/tekwiki/wiki/Dennis_Tillman_7V10 but for the TM50X series mainframes?  Would be handy, Colin.Jim Ford Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------From: "Colin Herbert via groups.io" <colingherbert=blueyonder.co.uk@groups.io> Date: 7/24/20 9:56 AM (GMT-08:00) To: TekScopes@groups.io Subject: [TekScopes] Dead TM500 plug-in sought I am looking for a dead TM500-series module. What I actually want is the frame and rear connector with the aim of bringing out various backplane connections to the front panel. The idea is to be able to check on some voltages and to test the pass transistors easily. I don't want to pay a fortune for a plug-in that wants repairing, I want something which is non-functional. I don't mind paying for shipping, but only within the UK or perhaps Europe.I live in London, UK, so I don't think shipping from far-flung places will be sensible.Call it recycling.TIA, Colin.


Dead TM500 plug-in sought

Colin Herbert
 

I am looking for a dead TM500-series module. What I actually want is the frame and rear connector with the aim of bringing out various backplane connections to the front panel. The idea is to be able to check on some voltages and to test the pass transistors easily. I don't want to pay a fortune for a plug-in that wants repairing, I want something which is non-functional. I don't mind paying for shipping, but only within the UK or perhaps Europe.
I live in London, UK, so I don't think shipping from far-flung places will be sensible.
Call it recycling.
TIA, Colin.


Re: Need help with 11801 delay jitter #photo-notice

Chuck Harris
 

From what I remember, one special option of the 11801
came out with a calibrator that was half of the S26 TDR
head. It has a 20ps calibrator. It can be recognized
by its gold APC-3.5 connector... where as the common
calibrator had a stainless APC-3.5 connector.

The fancy calibrator was done so you could roll your own
TDR system using the other sampling heads.

-Chuck Harris

John Gord via groups.io wrote:

Lucas,
From what I have been able to find, the 11801 has a 20ps rise time calibrator, but the 11801C has a 250ps rise time calibrator. I don't know about the A and B versions.
--John Gord

On Thu, Jul 23, 2020 at 04:59 PM, <lccavalheiro@...> wrote:


Hi Reginald,

I got pretty excited with the idea of getting a 19ps rise time from the
calibrator, but when I connect it to the sampling head I'm only measuring
hundreds of ps rise time. The waveform is synchronizing and looks fine, but
the rise time is definitely much slower than 19ps. Do you think this could be
an issue with my calibration signal, or is there any configuration that can
change that?

Thanks,

Lucas



Re: 7CT1N horizontal calibration

Colin Herbert
 

First: Do you have a copy of the Service Manual, even if just a pdf? If you don't have any kind of Service Manual, get one before you mess with anything. On P 3-3 of my Service Manual, there is a Fig. 3-1, which clearly shows R 90 as "V/Step CAL", so if you haven't seen that I am puzzled.

I haven't studied the schematics, but I have a vague idea of how the device functions. Bear this in mind and that therefore anything that I write may be wrong; I am mainly using logic.

Don't forget that the 7CT1N is a dynamic device and that when working it will be continually changing voltages in order to display results on the CRT screen, so I don't think I would expect to see whatever the volts per division control is set at giving a steady voltage at any point. It seems to me from the Manual that Tek advocate putting the 7CT1N into a vertical compartment to adjust anything, so perhaps that is the best set-up. I think that if the 7CT1N is subsequently placed in a horizontal compartment, the calibration will still be valid, so long as the horizontal and vertical channels on the host scope are properly calibrated. You just need a time-base with an amplifier function (i.e. X/Y) or maybe putting a vertical plug-in into a vertical compartment.

Good Luck with it, Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of EJP
Sent: 24 July 2020 10:50
To: TekScopes@groups.io
Subject: [TekScopes] 7CT1N horizontal calibration

This device gives you choice of 0.5V or 2V per horizontal division, and a 10X multiplier. This implies that the voltage at the C/E terminals with the voltage control fully CW should be 5, 20, 50, or 200V, assuming ten horizontal divisions. However the actual voltages are about half of this in each case. I'm using it in a horizontal slot, and there is no calibration procedure for X in this mode, or any internal trimpot for it either that I can see.

The scope's own X calibration is pretty accurate when evaluated with a vertical plugin in a horizontal slot.

Or am I crazy?

EJP


Re: Need help with 11801 delay jitter #photo-notice

Albert Otten
 

I thought it was well known by now that 2 types of calibrator units exist. Regrettably I only have a CSA803 and CSA803A, hence the slower type.
See also https://groups.io/g/TekScopes/message/155394?p=,,,20,0,0,0::Created,,11801+calibrator+connector,20,2,0,30465052 .

Albert


7CT1N horizontal calibration

EJP
 

This device gives you choice of 0.5V or 2V per horizontal division, and a 10X multiplier. This implies that the voltage at the C/E terminals with the voltage control fully CW should be 5, 20, 50, or 200V, assuming ten horizontal divisions. However the actual voltages are about half of this in each case. I'm using it in a horizontal slot, and there is no calibration procedure for X in this mode, or any internal trimpot for it either that I can see.

The scope's own X calibration is pretty accurate when evaluated with a vertical plugin in a horizontal slot.

Or am I crazy?

EJP


Re: Need help with 11801 delay jitter #photo-notice

John Gord
 

Lucas,
From what I have been able to find, the 11801 has a 20ps rise time calibrator, but the 11801C has a 250ps rise time calibrator. I don't know about the A and B versions.
--John Gord

On Thu, Jul 23, 2020 at 04:59 PM, <lccavalheiro@...> wrote:


Hi Reginald,

I got pretty excited with the idea of getting a 19ps rise time from the
calibrator, but when I connect it to the sampling head I'm only measuring
hundreds of ps rise time. The waveform is synchronizing and looks fine, but
the rise time is definitely much slower than 19ps. Do you think this could be
an issue with my calibration signal, or is there any configuration that can
change that?

Thanks,

Lucas


Re: Need help with 11801 delay jitter #photo-notice

Chuck Harris
 

It is important that you remember your 11801 is not an
ordinary digital storage scope: It is a sampling scope.

Sampling scopes do their magic by taking small samples of
hundreds, or even thousands of repetitions of a given signal.

Each time they trigger, they grab another single voltage
measurement, and each time they trigger, they offset to a
slightly different timing point in the waveform.

Only after they have gathered a thousand, or so samples from a
thousand or so triggers of the waveform, do they have enough data
to reconstruct one full picture of the waveform.

If... each trigger isn't exactly like every other... because jitter
is happening, then you will get nothing but a garbage representation
of the waveform.

-Chuck Harris

lccavalheiro@... wrote:

Hi Clark,

You made a great point about the jitter spec and I've take the measurement you suggested. Without smoothing, the jitter is within specs for delays lower than few hundreds of ns, but if I get to more than a few us, it seems to fall out of the spec, even the 2ps + 4ppm of the delay. Either way, I think the equipment is working just fine, and I don't think I'll need to use large delays.
Thanks again for the feedback.

Lucas




Re: Need help with 11801 delay jitter #photo-notice

lccavalheiro@...
 

Hi Reginald,

I got pretty excited with the idea of getting a 19ps rise time from the calibrator, but when I connect it to the sampling head I'm only measuring hundreds of ps rise time. The waveform is synchronizing and looks fine, but the rise time is definitely much slower than 19ps. Do you think this could be an issue with my calibration signal, or is there any configuration that can change that?

Thanks,

Lucas


Re: Need help with 11801 delay jitter #photo-notice

lccavalheiro@...
 

Hi Clark,

You made a great point about the jitter spec and I've take the measurement you suggested. Without smoothing, the jitter is within specs for delays lower than few hundreds of ns, but if I get to more than a few us, it seems to fall out of the spec, even the 2ps + 4ppm of the delay. Either way, I think the equipment is working just fine, and I don't think I'll need to use large delays.
Thanks again for the feedback.

Lucas