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Re: Is it OK to talk Keithley here since it's part of Tek?
Hi Ed,
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I would think you would have a lot more success finding answers to any Keithley questions you may have in a forum devoted to Keithley. But since Danaher bought Keithley in 2010 and merged it with Tektronix shortly afterwards I suppose anything made with the Keithley name on it AFTER their merger in 2010 is a Tek product. If the members of TekScopes find discussions of Keithley to be distracting I may have to ask you to setup a Keithley Forum on Groups.io of your own. Dennis Tillman W7pF
-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Ed Breya via groups.io Sent: Thursday, July 23, 2020 9:09 AM To: TekScopes@groups.io Subject: [TekScopes] Is it OK to talk Keithley here since it's part of Tek? As many know, Tek has owned Keithley for some time. Is it OK to include any Keithley stuff here, considering it's now under the Tek umbrella/brand? Ed -- Dennis Tillman W7pF TekScopes Moderator
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Re: TM506
Stephen
Ok, now that the TM506 is up and running perfectly again (thanks to all of you who guided me), now I have 3 plugins to fix: FG502, DC503, and SC502.
Starting with the FG502. I took a closer look at it today. Visual inspection. R532 was charred. I replaced it, as well as C532. All the other resistors in that cluster read the correct 33 ohm value. A large area in that zone seems to have been exposed to a lot of heat. The bord is discolored. However, all the traces are present and good. I did redo some solder joints though. But I still have the same problem. As long as I don’t go up past (10 -2), all is kind of ok if I don’t push the voltage past 9 o’clock. The square waves are far from being sharp, but at least they look like square waves. Past 9 o’clock it gets extremely noisy and distorted, and the waveforms don’t look the way they should. Starting at (10 -3) everything is ugly and completely off. Sines look like triangles, and square waves pretty much the same, no matter what the voltage is set at. Since everything is base on the triangle wave... Should I start by looking at that first? Or is the voltage output messing everything up? Regulator problem maybe? BTW, I’ve of course checked all the voltages, and they’re dead on: +20, -19.9, 17.1, -17.1
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Re: Tek R561B on CL in Austin
flightsimalex@...
I'm interested... My dad lives in Aus and could pick up... Where in Austin and do you take PayPal?
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Re: Dead TM500 plug-in sought
I bought one of these to act as an extender:
https://www.amazon.com/gp/product/B00F1YQMXO/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&;psc=1 and it works perfectly without an modification other than cutting a slot in the male end to accommodate the connector keys in the chassis.
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Re: Need help with 11801 delay jitter
#photo-notice
lccavalheiro@...
I was actually thinking about that. I'm wondering what would be the worst-case jitter on Leo's pulser. The laser driver use claims typical 4 ps pk-pk deterministic and 0.55 ps RMS random jitter. I guess that would be the major source of jitter there.
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Re: Ferrite Beads in Tek Transistor Adapters
Glydeck
Chuck,
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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@erols.com> wrote:
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Re: Ferrite Beads in Tek Transistor Adapters
Chuck Harris
Votes have consequences.
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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.
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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.
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“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:This is why we have "Warning" labels on Preparation H that states "not to be taken orally".
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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😂😂😂
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Re: Ferrite Beads in Tek Transistor Adapters
On Fri, Jul 24, 2020 at 09:30 PM, Dave Seiter wrote:
This is why we have "Warning" labels on Preparation H that states "not to be taken orally". -- Michael Lynch Dardanelle, AR
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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)
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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@gmail.com> wrote:
On 2020-07-20, at 03:20, Chuck Harris <cfharris@erols.com> wrote: 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
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Re: 485 Cordwrap Feet
Roy Thistle
On Thu, Jul 23, 2020 at 12:10 PM, Michael W. Lynch wrote:
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.
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FS Tek C30 camera
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
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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.
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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.
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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
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-------- 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.
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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.
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Re: Need help with 11801 delay jitter
#photo-notice
Chuck Harris
From what I remember, one special option of the 11801
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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
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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.
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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
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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
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