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Re: 11801C and the T1331 error: lost factory TB calibration data.

 

These are just toys for an old man. I bought my 11801 because of the CSA803A plots that you send out with your pulsers. I thought it was just *so* cool. I got lucky and picked up an 11801 with a bad NVRAM error for $145 delivered and a pair of SD-22s for $150 delivered. With some help from a UK member of the list I got the NVRAM replaced. To my delight it all works fine Except for the video display jitter I mentioned earlier.

I bought 4x SD-26 heads for $200 each, one of which would not calibrate correctly. The seller replaced it. Thursday I got my SD-24 which eliminates the issues of impedance mismatch using a tee to pick off reflections.

I bought the 4x SD-26s to measure timing skew for various DSP filter topologies implemented on a Zynq for use in a DSO. After spending some time with an MSOX3104T and RTM3104 I am quite underwhelmed by what you get for $20K. So rather than complain, I'm going to fix the issue by writing proper FW.

I have a 2nd 11801 sitting in CA at my sister's with an SD-22 or 26 head. I'm told one channel is wonky. but won't know for sure until I get it. I know it has an NVRAM error. I primarily got it as a parts mule.

About all I can think of right now to do with an SD-32 is check my Leo Bodnar pulsers ;-)

If I do get an SD-32 I'll try to build a faster rise time pulser than yours. I've read a bunch on non-linear pulse generators.

I have had more sheer fun fooling around doing completely insignificant experiments with this beast than any other piece of electronics I have ever owned. Partly this is because a transmission line is the EM analog to the 1D plane layered medium problem in reflection seismology. So it's *very* familiar. Being able to see on the screen things I have calculated in countless numerical simulations is just a blast.

Have Fun!
Reg
Re: Plug for 7CT1N captive lead?

 

You can grind off the crimp where the outer ring holds a washer and a
spring in place. Some can be clipped with heavy diagonal cutters, since the
crimp weakens the brass.A cutoff wheel in a Dremel or similar Roto-tool
works OK, as well.stick it on a BNC jack to hold it in place. A jack with a
square flange can be rotated as you cut each 90 degrees. A small drill
press vice is handy for tasks like this. I've used one to make cables for
decades. :)

On Sun, Aug 25, 2019 at 6:17 PM EJP <esmond.pitt@...> wrote:

'Gaffer tape' was a joke actually. I will use heatshrink tubing on it.

I looked at the RJ58 plugs but cannot see how to get them apart.

EJP
Re: Plug for 7CT1N captive lead?

 

Brute force helps! I have a memory of doing it many years ago by turning off the peaned over bit at the back of the locking ring but without a lathe you can just start filing and/or cutting the ring till you can split it off. It’s loose and made of brass so it should give up without too much of a fight!

Adrian
Sent from an I-thingy

On 25 Aug 2019, at 23:17, EJP <esmond.pitt@...> wrote:

'Gaffer tape' was a joke actually. I will use heatshrink tubing on it.

I looked at the RJ58 plugs but cannot see how to get them apart.

EJP
Re: Plug for 7CT1N captive lead?

Roy Morgan
 

Roy sends.

On Aug 25, 2019, at 3:16 PM, Dave Seiter <d.seiter@...> wrote:

Gaffer tape (or Gaff tape) is used in studios, sets and theaters for EVERYTHING.
It's like duct tape, but holds better
In filmmaking, the “gaffer” is the head electrician and/or lighting designer.

I somewhat reluctantly add:

If it should move and doesn’t, use WD-40

If it moves and shouldn’t, use duct tape
Re: Q: covers for 555 power supply?

 

Hi Jim. You might want to check with Ron on eBay. His Id is Mercedesman6572. He has a lot of Tektronix parts. His email is mercedesmann@.... I have found him pretty helpful in the past.
Re: Plug for 7CT1N captive lead?

 

'Gaffer tape' was a joke actually. I will use heatshrink tubing on it.

I looked at the RJ58 plugs but cannot see how to get them apart.

EJP
Re: Tek 576 Curve Tracer HV Transformer winding

 

Am I the "gentleman" in the 576 thread?

I asked a few questions, got the information and went along
asking a friend if he could print the bobbin. Then out of scrapped
stuff made a little manual winding machine
and used soft rubber grommets to keep the bobbin in place.

This was a very low-level thing IMHO not worth
any detailed description. "Quick and dirty"
No counting mechanism. I had to keep track of every
turn I made. I counted the number of turns on each layer
and wrote it down, adding up to the 1000 or so turns
for the HV-winding. Simple but time consuming.

I described how I separated the two core halfs.

The winding diagram was uploaded to KO4BB.

I described the special High Voltage winding process carefully
and I have seen this procedure quoted by others.

I might have some pictures of the bobbin
but anyone with a ruler
can determine the proper size for it.

Sorry if I have offended anyone.
Not my intention.

Cheers

Ulf Kylenfall
SM6GXV
Q: covers for 555 power supply?

 

Hi all

At the last swap fest I got a 555 scope power supply without covers. Does
anybody have covers for this, or for any unit with comparably sized covers?

I can provide dimensions for the covers. I can used slightly distressed
covers and I don't need a complete set -- I was just hoping to get close to
a complete top and side cover set. Also I would accept suggestions for
pieces I could modify to work, as I can do some sheetmetal work. My goal
is to make an external power supply for a radio amplifier.

Thanks and 73
Jim

PS, and completely unrelated -- my sister gifted me an old Amana microwave
oven, aid it looks like it would make a delightful chassis for an HF amp
utilizing a glass-envelope tube so you could see through the door and watch
the tube plate get red. Just a thought ...
Re: Plug for 7CT1N captive lead?

 

Thank you, larry

On Aug 25, 2019, at 3:16 PM, Dave Seiter <d.seiter@...> wrote:

Gaffer tape (or Gaff tape) is used in studios, sets and theaters for EVERYTHING. It's like duct tape, but holds better, tears better, feels better, etc, and tends not to leave a mess behind if you leave on too long. It can also be really pricey.
-Dave


On Sunday, August 25, 2019, 05:45:02 AM PDT, Lawrance A. Schneider <llaassllaaass@...> wrote:

Hi,

I’d never heard of ‘gaffer tape”. Why not just plane plastic electrical tape?


Larry

On Aug 25, 2019, at 5:37 AM, EJP <esmond.pitt@...> wrote:

When I went to put on a standard soldered BNC plug I found there is no shielding in the cable, only a pretty thick set of strands for the inner conductor, so I was unable to even fix the outer cover on. So I settled for just the pin. I'm not happy with it, as it is uninsulated: gaffer tape awaits, but also a better solution, if there is one.

EJP
Re: 11801C and the T1331 error: lost factory TB calibration data.

 

On Sun, Aug 25, 2019 at 12:48 AM, Reginald Beardsley wrote:
All I need now is an SD-32 at a sensible price.
What are you going to use it for?
I have two SD-30 that I use interchangeably that I have bought broken and fixed: one had blown termination resistors, another - faulty trigger pick-off hardline.
I don't trust *any* SD heads, even sold as guaranteed working. My approach with them: if it works - it's a bonus.
SD series had really bad manufacturing quality track record. From delaminating PCB gold plating to cracked solder to tin whiskers to missing bond wires to dying EEPROMs.
I reckon S-series will still be alive and kicking while SD-series will perish in time.
Cheers
Leo
Re: Plug for 7CT1N captive lead?

 

Gaffer tape (or Gaff tape) is used in studios, sets and theaters for EVERYTHING.? It's like duct tape, but holds better, tears better, feels better, etc, and tends not to leave a mess behind if you leave on too long.? It can also be really pricey.
-Dave

On Sunday, August 25, 2019, 05:45:02 AM PDT, Lawrance A. Schneider <llaassllaaass@...> wrote:

Hi,

I’d never heard of ‘gaffer tape”.? Why not just plane plastic electrical tape?


Larry

On Aug 25, 2019, at 5:37 AM, EJP <esmond.pitt@...> wrote:

When I went to put on a standard soldered BNC plug I found there is no shielding in the cable, only a pretty thick set of strands for the inner conductor, so I was unable to even fix the outer cover on. So I settled for just the pin. I'm not happy with it, as it is uninsulated: gaffer tape awaits, but also a better solution, if there is one.

EJP
Re: Plug for 7CT1N captive lead?

 

I have used some ordinary RG218 cable and BNC connector & left the shield unconnected on my 5CT1N. Works like a charm.
Cheers,
Magnus?

Maybe it can be seen from here:



Regards,

Ignacio EB4APL



El 25/08/2019 a las 19:14, EB4APL escribió:
I'm sorry, I forgot that attachments are not allowed. I will upload it
somewhere and I'll send the link.



El 25/08/2019 a las 19:11, EB4APL via Groups.Io escribió:
Could this be used? It is with me more than 40 years, probably it was
manufactured by Pomona.

Ignacio EB4APL



---
---
El software de antivirus Avast ha analizado este correo electrónico en busca de virus.
Re: Tek 576 Curve Tracer HV Transformer winding

 

Hi Peter,

Mine moves exactly one division too

Vert Offset Horiz Pol Max Peak Series Resistor
Left/Right
0.5mA 0 50v +NPN 1500v 3k (220W) off (no
component)
Turn the variable collector supply so the trace reaches to 10 div. What happens to the left end of the trace? Mine moves over 1 div.


-----Mensaje original-----
De: [email protected] [mailto:[email protected]] En nombre de peter bunge
Enviado el: domingo, 25 de agosto de 2019 18:34
Para: [email protected]
Asunto: Re: [TekScopes] Tek 576 Curve Tracer HV Transformer winding

This may be of interest to the Tek Group so I am going on line again.
I got my 576 working again.
It was one of the push-on connectors on the top left board. I have had trouble with those long ago on a 465 scope. I just ran an insulated rod along them until the trace re-appeared. I will have to go around the entire curve tracer with a pair of plyers and pull off and push on each one. It solves many problems.
I would appreciate you doing a couple of tests:
Vert Offset Horiz Pol Max Peak Series Resistor
Left/Right
0.5mA 0 50v +NPN 1500v 3k (220W) off (no
component)
Turn the variable collector supply so the trace reaches to 10 div. What happens to the left end of the trace? Mine moves over 1 div.
Reset to the following with a 2N3565 (high gain NPN)
2uA 0 0.1v +NPN 10v 30 ohm Step Gen,
0.05 uA, Zero, Steps, Rep Norm, 3 steps
turn the collector to full scale as shown (1 volt). The first trace is not really dim, it is the camera.
Do you see a similar set of curves. I am most interested in the looping.
[image: 2N3565.jpg]

On Sat, Aug 24, 2019 at 3:11 PM Miguel Work <harrimansat@...> wrote:

I have two 576, if you told me which test you need to compare, I will
do it with mine. Do you know ferrite core specs? Could be changed some
transformer HV turns for a voltage multiplier?



FERRITE CORE E 20 N27
Core Type : E
Core Size : E20/10/6
Core Material Grade : N27
For Use With : -
Effective Magnetic Path Length : 46.3mm Ae Effective Cross Section
Area : 32.1mm? Inductance Factor Al : 1.3?H Product Range : B66311
Series SVHC : No SVHC (15-Jun-2015) Accessory Type : Ferrite Core
Material Grade : N27 -----Mensaje original-----
De: [email protected] [mailto:[email protected]] En nombre de
peter bunge Enviado el: sábado, 24 de agosto de 2019 16:08
Para: [email protected]
Asunto: Re: [TekScopes] Tek 576 Curve Tracer HV Transformer winding

Thanks David for your generous offer;
Where do they get the cores to make a compatible transformer that
works in the 576 circuit. This is not a 115v 60 Hz transformer.
A friend suggested a plate transformer and doublers or triplers. 225v
is also needed.
I have been looking at using a 4 kV and 225 V switching power supplies
from China and I have used some for other projects. They tend to be
noisy but can be cleaned up.
Since my 576 is still working there is no great urgency.
I also want to look at my friend's 577 and compare it to my 576. His
is smaller and lighter but may not do as much.
My 576 does weird things at lower currents (all loops) and PNP do not
seem to work the same as NPN (lack of steps) so the transformer is not
the only issue. I spent a couple of days working on it a few years ago
but could not improve it.
I need to find someone with a 576 and compare traces to see if mine is
"normal".
I need the 1500v capability which rules out some of the newer ones
which are also more expensive.
I will think about your offer.
Peter

On Fri, Aug 23, 2019 at 4:28 PM drawding@...
<drawding@...
wrote:

Yes. David Rawding is still here.

: )

I bought five professionally made transformers. One was donated to
Bob for his kind help. Two were used by me. Two were sold. I am
all
out.

Another run is ~ $1k for 5 more. Five is the minimum order. A bit
pricey, I know. However, they are made by a professional
transformer company. Fully enclosed and potted in silicone. If you
consider what technical wages are today and overhead and materials,
I would say it is fair pricing. However, at the hobby level, it is pricey.

If we can find five buyers (though this seems unlikely), I will
handle the details, and will sell at my cost + shipping.

Also, as you can see from this thread several people have been
successful winding their own.

One gentleman came here a year or so ago, asked a bunch of
questions, got great support from the group, ended up successfully
winding his own, and left. He was asked to put some details
together (pictures, documentation, video, etc), but apparently could not be bothered.

I hope you find a solution.

Thanks,
Dave
Re: Plug for 7CT1N captive lead?

 

The low 100 mV / division vertical sensitivity, a very low operating frequency and the shortness of the lead are the reasons why Tek did not shield this connection.
Anything that completes the circuit to the center pin is sufficient. I suggest soldering or crimping a pin on the end of the lead, followed by several layers of gradually larger shrink tubing to provide a handle and stop the lead from falling inside the 7CT1N when retracted. A rigid plastic probe handle cut short and epoxy (JB Weld?) might also work. At a maximum voltage of 0.8 volts, there should be no safety issues.

Regards, Cliff Carrie
________________________________
From: [email protected] <[email protected]> on behalf of EB4APL <eb4apl@...>
Sent: Sunday, August 25, 2019 1:16 PM
To: [email protected] <[email protected]>
Subject: Re: [TekScopes] Plug for 7CT1N captive lead?

Maybe it can be seen from here:



Regards,

Ignacio EB4APL



El 25/08/2019 a las 19:14, EB4APL escribió:
I'm sorry, I forgot that attachments are not allowed. I will upload it
somewhere and I'll send the link.



El 25/08/2019 a las 19:11, EB4APL via Groups.Io escribió:
Could this be used? It is with me more than 40 years, probably it was
manufactured by Pomona.

Ignacio EB4APL



---
---
El software de antivirus Avast ha analizado este correo electrónico en busca de virus.
Re: Tek 576 Curve Tracer HV Transformer winding

peter bunge
 

The picture does not show.
I will attach. Note this is low voltage (1v full scale) and very low
current in base and collector.

On Sun, Aug 25, 2019 at 12:34 PM peter bunge via Groups.Io <bunge.pjp=
[email protected]> wrote:

This may be of interest to the Tek Group so I am going on line again.
I got my 576 working again.
It was one of the push-on connectors on the top left board. I have had
trouble with those long ago on a 465 scope. I just ran an insulated rod
along them until the trace re-appeared. I will have to go around the
entire curve tracer with a pair of plyers and pull off and push on each
one. It solves many problems.
I would appreciate you doing a couple of tests:
Vert Offset Horiz Pol Max Peak Series Resistor
Left/Right
0.5mA 0 50v +NPN 1500v 3k (220W) off (no
component)
Turn the variable collector supply so the trace reaches to 10 div. What
happens to the left end of the trace? Mine moves over 1 div.
Reset to the following with a 2N3565 (high gain NPN)
2uA 0 0.1v +NPN 10v 30 ohm Step Gen,
0.05 uA, Zero, Steps, Rep Norm, 3 steps
turn the collector to full scale as shown (1 volt). The first trace is not
really dim, it is the camera.
Do you see a similar set of curves. I am most interested in the looping.
[image: 2N3565.jpg]

On Sat, Aug 24, 2019 at 3:11 PM Miguel Work <harrimansat@...>
wrote:

I have two 576, if you told me which test you need to compare, I will do
it with mine. Do you know ferrite core specs? Could be changed some
transformer HV turns for a voltage multiplier?



FERRITE CORE E 20 N27
Core Type : E
Core Size : E20/10/6
Core Material Grade : N27
For Use With : -
Effective Magnetic Path Length : 46.3mm
Ae Effective Cross Section Area : 32.1mm?
Inductance Factor Al : 1.3?H
Product Range : B66311 Series
SVHC : No SVHC (15-Jun-2015)
Accessory Type : Ferrite Core
Material Grade : N27
-----Mensaje original-----
De: [email protected] [mailto:[email protected]] En nombre de peter
bunge
Enviado el: sábado, 24 de agosto de 2019 16:08
Para: [email protected]
Asunto: Re: [TekScopes] Tek 576 Curve Tracer HV Transformer winding

Thanks David for your generous offer;
Where do they get the cores to make a compatible transformer that works
in
the 576 circuit. This is not a 115v 60 Hz transformer.
A friend suggested a plate transformer and doublers or triplers. 225v is
also needed.
I have been looking at using a 4 kV and 225 V switching power supplies
from China and I have used some for other projects. They tend to be noisy
but can be cleaned up.
Since my 576 is still working there is no great urgency.
I also want to look at my friend's 577 and compare it to my 576. His is
smaller and lighter but may not do as much.
My 576 does weird things at lower currents (all loops) and PNP do not
seem
to work the same as NPN (lack of steps) so the transformer is not the
only
issue. I spent a couple of days working on it a few years ago but could
not
improve it.
I need to find someone with a 576 and compare traces to see if mine is
"normal".
I need the 1500v capability which rules out some of the newer ones which
are also more expensive.
I will think about your offer.
Peter

On Fri, Aug 23, 2019 at 4:28 PM drawding@... <
drawding@...
wrote:

Yes. David Rawding is still here.

: )

I bought five professionally made transformers. One was donated to
Bob for his kind help. Two were used by me. Two were sold. I am all
out.

Another run is ~ $1k for 5 more. Five is the minimum order. A bit
pricey, I know. However, they are made by a professional transformer
company. Fully enclosed and potted in silicone. If you consider what
technical wages are today and overhead and materials, I would say it
is fair pricing. However, at the hobby level, it is pricey.

If we can find five buyers (though this seems unlikely), I will
handle the details, and will sell at my cost + shipping.

Also, as you can see from this thread several people have been
successful winding their own.

One gentleman came here a year or so ago, asked a bunch of questions,
got great support from the group, ended up successfully winding his
own, and left. He was asked to put some details together (pictures,
documentation, video, etc), but apparently could not be bothered.

I hope you find a solution.

Thanks,
Dave
Re: Tek 576 Curve Tracer HV Transformer winding

RustySparks
 

If our cores can be rewound that may make things easier? I would pay $200 for either new or rewound 453 HV XFMR done with professional quality. Doesn't make good economic sense I agree, but I would gladly pay that, both for sentimental reasons and to get the ball rolling in the first place.

-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Chuck Harris
Sent: Sunday, August 25, 2019 10:45 AM
To: [email protected]
Subject: Re: [TekScopes] Tek 576 Curve Tracer HV Transformer winding

If you guys are all willing to pay in the $200-300 range, like the custom made stuff that was done for the 576, I'll start winding again.

-Chuck Harris

Dave Daniel wrote:
And 547s and 7934s ...

DaveD


On 8/25/2019 8:12 AM, RustySparks wrote:
I wonder if the same company could make a batch of HV transformers
for the 453 scope? I think several users of this group, including
myself, have 453 scopes with bad HV transformers.
Thanks,
Harry

-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of
drawding@...
Sent: Sunday, August 25, 2019 1:25 AM
To: [email protected]
Subject: Re: [TekScopes] Tek 576 Curve Tracer HV Transformer winding

"Where do they get the cores to make a compatible transformer that
works in the 576 circuit. This is not a 115v 60 Hz transformer."

I believe that they make them in house. I sent them the original Tek
transformer specification. I got the specification drawing from Bob
Koller (now posted online as per this thread).

Thanks,
Dave
Re: Plug for 7CT1N captive lead?

 

Maybe it can be seen from here:



Regards,

Ignacio EB4APL



El 25/08/2019 a las 19:14, EB4APL escribió:
I'm sorry, I forgot that attachments are not allowed. I will upload it somewhere and I'll send the link.



El 25/08/2019 a las 19:11, EB4APL via Groups.Io escribió:
Could this be used? It is with me more than 40 years, probably it was
manufactured by Pomona.

Ignacio EB4APL



---
---
El software de antivirus Avast ha analizado este correo electrónico en busca de virus.
Re: Plug for 7CT1N captive lead?

 

I'm sorry, I forgot that attachments are not allowed. I will upload it somewhere and I'll send the link.



El 25/08/2019 a las 19:11, EB4APL via Groups.Io escribió:
Could this be used? It is with me more than 40 years, probably it was
manufactured by Pomona.

Ignacio EB4APL



---
---
El software de antivirus Avast ha analizado este correo electrónico en busca de virus.
Re: Plug for 7CT1N captive lead?

 

Could this be used? It is with me more than 40 years, probably it was
manufactured by Pomona.

Ignacio EB4APL



---
El software de antivirus Avast ha analizado este correo electrónico en busca de virus.
7D01 manual for serial B020000 + for $5 postage.

John Griessen
 

I think I can find some probes. Ask off list if interested. john@...
49481 - 49500 of 208745