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Re: CooperVision Tektronix 5000 series scope?

 

The 608 is an X-Y monitor, so that is a nice find in itself.

The card cage might be a modified TM504.

The plug-in are clearly custom, but those are also a nice find (if you plan to build any custom TM500 plug-ins). I can't make out in the photos whether there are any key slots cut in the card edge connectors. If there are, that might indicate what kind of backplane they are meant for (TM500 or 5000-series).

-- Jeff Dutky


Re: PG506 vs. PG506A risetime?

Albert Otten
 

The PG506 and PG506A have the same spec 1 ns for rise time (to zero) of the fast pulse outputs.
The TD pulser 067-0681-01 is mentioned under as Optional Accessories is faster caibration aid but is no part of the TG506(A).

Albert


Re: CooperVision Tektronix 5000 series scope?

-
 

I thought that it was a 5000 series scope but it's not. The back of the
CRT section says that it is a 608 monitor. The monitor section has two
Tektronix stickers one says that it is the Identification number
9-25-YN-61 and the other is a serial number B026709. I'm guessing that
those numbers apply only to the monitor. The main chassis has a sticker on
it that says CooperVision and Model 404.

I just finished uploading pictures. They're at <
https://groups.io/g/TekScopes/photo/260882/8?p=Created,,,20,2,0,0>

On Wed, Feb 17, 2021 at 11:23 AM Jeff Dutky <jeff.dutky@gmail.com> wrote:

You say you found a model number; what was it? That might be helpful in
identifying the instrument.






Updated album CooperVision scope #photo-notice

TekScopes@groups.io Notification <noreply@...>
 

- <rrrr6789@...> updated the album CooperVision scope: Bought is a surplus store and don't know anything about. The plugins do fit a TM 503 mainframe and I thought that is was a modified Series 5000 scope but this morning I found that back of the CRT section is marked as a Tektronix 608 monitor. The main chassis has two Tektronix stickers on the back as shown.


Re: 465B strange ripple

Stephen
 

On Wed, Feb 17, 2021 at 06:01 AM, Raymond Domp Frank wrote:

This is all becoming less and less clear to me and we (or I only?) seem to be
repeating ourselves. Under what exact conditions is the "disturbance" (a 1mV
ripple of 50/100 Hz?) visible on the DUT 'scope's CRT? (Non)shorted input(s),
(non)shorted attenuator output(s)?

Raymond
I have made this quite clear at the begin of the thread, I think...
That ripple is seen on a, what should be, flat trace. Whether when the channel is grounded or nor, and without anything connected to it. It starts to get very noticeable and annoying at around .5 ms/div and 20mV or less.
Otherwise the trace looks ok, but what is weird is that I can sometimes literally see the ripple WITHIN the trace itself. As is the trace was a tiny scope... kinda hard to explain... I know how this sounds, but I’m neither hallucinating not mad. It’s as if the trace was not a straight line, but very tight wave forms ~~~~~~~~, sometimes entangled... It’s very weird....
NONE of my other scopes behave that way. None whatsoever. Maybes that’s just the way it is...


Added album CooperVision scope #photo-notice

TekScopes@groups.io Notification <noreply@...>
 

- <rrrr6789@...> added the album CooperVision scope: Bought is a surplus store and don't know anything about. The scope is a Tektronix 608 monitor and the chassis has two Tektronix stickers on the back.


Re: 465B strange ripple

Stephen
 

On Wed, Feb 17, 2021 at 06:01 AM, Raymond Domp Frank wrote:

I don't understand how/why a signal/ripple of around 1mV would disturb
adjusting the horizontal using 1ms/div time markers; their amplitude would
normally be hundreds of mV at least.
It’s not about the horizontal amp at all. the time markers are also used to check and adjust Y-Axis and Geometry. And my eyes can see the pips not being steady, which makes this quite annoying (too me). Some people may not see it, I don’t know..., but I can. Maybe I’m being too picky...? 🤷‍♂️


Re: 2236 Sudden Tick Mode

Dave Ahrendt
 

Thanks for the tips so far. As of now I’ve narrowed the problem to the 30 volt line to the CTM. It’s used only for two 6118 driver chips to the VFD and a set of three transistors that drive the A segment of the VFD since they ran out of pins on the two driver chips. With the 30 volts isolated from the CTM the scope powers up and behaves like it should. Still baffled as to what I might have done.

It’s too cold in the shop to do anything else today so if I have any power after the ice tonight I’ll continue on tomorrow.


Re: Probe identify problem on 7A16 plug-in (Mainframe 7603)

Ozan
 

Yes, the rest of the board is the same as the diagram. It would seem that this
reading card was designed for specific probes, it doesn't seem to have been
modified after production, I don't know what the final dash 07 consists of.
However I replaced the 22.2K resistor with two selected 1K series resistors to
get 2.05K and everything works perfectly.

Thanks Ozan for the help!
Good news and congratulations for the successful modification.
Ozan


Re: Probe identify problem on 7A16 plug-in (Mainframe 7603)

Attilio
 

Yes, the rest of the board is the same as the diagram. It would seem that this reading card was designed for specific probes, it doesn't seem to have been modified after production, I don't know what the final dash 07 consists of.
However I replaced the 22.2K resistor with two selected 1K series resistors to get 2.05K and everything works perfectly.

Thanks Ozan for the help!

--Cheers
Attilio


Re: tunnel diodes retrace lines in curve tracer

Miguel Work
 

Thanks Jeff,

I have found some information in internet, I was stubborn

https://groups.io/g/TekScopes/album?id=260881


Re: [UK] 545A on eBay - Wigan

 

Colin,

The missing knob is one the left hand lever switch. It's not easy to see. It's a minor flaw.

-- Jeff Dutky


Re: Tm500 Extender on eBay

 

I added photos of the chamfered card edge connector to https://groups.io/g/TekScopes/album?id=260880

-- Jeff Dutky


Re: [UK] 545A on eBay - Wigan

 

On Tue, Feb 16, 2021 at 07:48 PM, John Shadbolt wrote:

https://www.ebay.co.uk/itm/Vintage-Oscillascope-Tektronix-Type-545A-Collectable-Project-Hobby-Untested-/274685077758
Bidding is picking up so will be interesting if anyone on here is the winner. I see the seller has put their mobile phone number, for anyone from outside the UK you can ring it by changing the leading 07 to +44 7, where + is either a long press of 0 on your mobile or your local country international access code.

I see it was made in Guernsey which is nice.

Too far away for me to offer to be your scope mule :-)

Regards,
John


Re: 2236 Sudden Tick Mode

tekscopegroup@...
 

Power supply is in self protect mode due probably to some external overload condition.
If no other clear indication of the cause if found, I think the logical step would be to go backtrack and remove the new VFD module and see if that makes any difference.
If it does than you know what is wrong. Otherwise it might be something else you inadvertently caused during the replacement process, and that is hopefully reversible.


Re: Tm500 Extender on eBay

 

I just received my TM500 extender (new manufacture) and can verify that it DOES have the chamfers on the key-slots. It looks very nice.

-- Jeff Dutky


Re: PG506 vs. PG506A risetime?

Eric
 

They might be talking about the 284 Vs the 506. The 284 is much faster about 70ps

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of Jeff Keyzer
Sent: Wednesday, February 17, 2021 1:01 PM
To: TekScopes@groups.io
Subject: [TekScopes] PG506 vs. PG506A risetime?

I have a Lecroy DA1855A differential amplifier with DXC100A probes. I am trying to calibrate the probes. The calibration manual calls for a PG506A "or equivalent" for calibration. They are using both the high amplitude and fast rise outputs of the pulser to adjust LF/HF probe compensation and CMRR.

There is also a paragraph that reads "If pulse generators such as the Tektronix PG506 that do not have a high enough slew rate are encountered in measurement situations..." and then they go on to describe a way of compensating the probes without access to a pulser.

I'm a little confused by their note, and since this the DA1855A a discontinued product I'm not expecting much help from Lecroy. I'm wondering if this is their way of saying that they prefer the PG506A over the PG506?

My question for the group - did the risetime/slew rate change between the PG506 and the PG506A? Would Lecroy have reason to prefer one over the other, or am I misreading their note?


PG506 vs. PG506A risetime?

Jeff Keyzer
 

I have a Lecroy DA1855A differential amplifier with DXC100A probes. I am trying to calibrate the probes. The calibration manual calls for a PG506A "or equivalent" for calibration. They are using both the high amplitude and fast rise outputs of the pulser to adjust LF/HF probe compensation and CMRR.

There is also a paragraph that reads "If pulse generators such as the Tektronix PG506 that do not have a high enough slew rate are encountered in measurement situations..." and then they go on to describe a way of compensating the probes without access to a pulser.

I'm a little confused by their note, and since this the DA1855A a discontinued product I'm not expecting much help from Lecroy. I'm wondering if this is their way of saying that they prefer the PG506A over the PG506?

My question for the group - did the risetime/slew rate change between the PG506 and the PG506A? Would Lecroy have reason to prefer one over the other, or am I misreading their note?


Re: tunnel diodes retrace lines in curve tracer

 

Miguel,

Isn't this what we expect to see, because, in the range of negative resistance the diodes is oscillating between the two ranges of positive resistance VERY rapidly?

Your display looks almost exactly like the others I find when I google for "tunnel diode curve tracer"

-- Jeff Dutky


tunnel diodes retrace lines in curve tracer

Miguel Work
 

Hi folks

I´m looking tunnel diode in curve tracer, I don´t understand because the retrace, jumping lines are straight and no in cross pattern

https://w140.com/tekwiki/wiki/Russian_tunnel_diodes#/media/File:Tunnel_Diode-RU-1I308G.jpg

help! :)

Thanks

Regards

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