Date   
Re: Fast Rise/Fall Time Pulser

Craig Sawyers <c.sawyers@...>
 

I have several forceps of different sizes. They are extremely handy for holding parts
I use mine for desoldering through hole resistors, dead tants etc. Clip onto one lead, keep a bit of
tension on it with one hand, turn board over and heat pad with soldering iron.

Craig

Re: NEW MEMBER

Kevin Clark
 

Hi Bob

Couple of things from me.

Ref the cable being cut off, this is done a lot with defective equipment to indicate it’s no good. The other way if seen it done is a half hitch in the power lead.

Re just the spot on the crt, I had this on my 2235 and it turned out to be a loose lead on the Direct crt connection. I suspect over the years with all the bumping down on desks etc it just came loose. It’s relatively easy to check and just required pushing back on with long nose pliers (power off of course)

Thanks
Kevin
Sent from my iPhone

On 13 Oct 2017, at 06:21, 'Tom Miller' tmiller11147@... [TekScopes] <TekScopes@...> wrote:

Hi Bob,

The first thing to do is get cozy with the service manual. Take a look at the schematics and how they appear in the manual and how there is a number for each schematic inside a diamond on the lower right of the drawing. Once you get that, it will be easier to give help.

There are two different service manuals, early and late. The late manual is for serial numbers from B250000 and up. Since you can't tell the S/N, you should start with the late manual. It should be available on the net.

First check would be the line voltage setting and fuse rating. Though since you got activity on the CRT, that is probably ok.

The best thing to do is take some DC measurements of all the low voltage power supply voltages on the main (interface) board. They are marked but refer to the one marked #12. You will want to measure the +110, +55, +15, +5, and -8 volt test points. Also, the +120 unregulated. If you can get hold of another scope, you can look at the ripple voltages on all of them. The manual has the specs in the Calibration - power supply section (p6-8) in the newer manual. It is likely that there is/are some out of spec capacitors that need attention.

If you have one of the older serials, check with artekmedia.com. Dave may have a good copy.

Good luck, that is a fine 100 MHz scope and many were made.

Regards

----- Original Message -----
From: ram16@... [TekScopes]
To: TekScopes@...
Sent: Friday, October 13, 2017 12:30 AM
Subject: [TekScopes] NEW MEMBER

Hello all,

New guy here. My name is Robert (Bob) Mustari. I'm 71 years old and have been employed as a mechanical engineer for 40+ years. Along the way I've worked with some highly qualified EEs and a little has rubbed off. Enough to make me dangerous. Let me say right away that in no way do I consider myself an EE and as such expect to be humbled in this group early & often. Don't give it a second thought. I'm here to learn and pain is part of the process. I just bought a basket case Tek 465 from ebay so I'm soliciting any & all advice as to how to proceed. The serial number is unreadable but I suspect it's pretty early. For some unknown reason someone had cut the power cord off about an inch outside the rear wall. I pulled the case and spliced in a new power cord and the device does power up. The only trace present is a spot with the beam finder depressed which can be moved with the X & Y controls and responds to brightness & focus. The only piece of test equipment I currently own is a multimeter but I will buy/borrow/rent as required. I have downloaded a set of manuals with the trouble shooting procedure. So, where to from here?



[Non-text portions of this message have been removed]


[Non-text portions of this message have been removed]

Re: NEW MEMBER

 

Hi Bob,

The first thing to do is get cozy with the service manual. Take a look at the schematics and how they appear in the manual and how there is a number for each schematic inside a diamond on the lower right of the drawing. Once you get that, it will be easier to give help.

There are two different service manuals, early and late. The late manual is for serial numbers from B250000 and up. Since you can't tell the S/N, you should start with the late manual. It should be available on the net.

First check would be the line voltage setting and fuse rating. Though since you got activity on the CRT, that is probably ok.

The best thing to do is take some DC measurements of all the low voltage power supply voltages on the main (interface) board. They are marked but refer to the one marked #12. You will want to measure the +110, +55, +15, +5, and -8 volt test points. Also, the +120 unregulated. If you can get hold of another scope, you can look at the ripple voltages on all of them. The manual has the specs in the Calibration - power supply section (p6-8) in the newer manual. It is likely that there is/are some out of spec capacitors that need attention.

If you have one of the older serials, check with artekmedia.com. Dave may have a good copy.

Good luck, that is a fine 100 MHz scope and many were made.

Regards

----- Original Message -----
From: ram16@... [TekScopes]
To: TekScopes@...
Sent: Friday, October 13, 2017 12:30 AM
Subject: [TekScopes] NEW MEMBER



Hello all,

New guy here. My name is Robert (Bob) Mustari. I'm 71 years old and have been employed as a mechanical engineer for 40+ years. Along the way I've worked with some highly qualified EEs and a little has rubbed off. Enough to make me dangerous. Let me say right away that in no way do I consider myself an EE and as such expect to be humbled in this group early & often. Don't give it a second thought. I'm here to learn and pain is part of the process. I just bought a basket case Tek 465 from ebay so I'm soliciting any & all advice as to how to proceed. The serial number is unreadable but I suspect it's pretty early. For some unknown reason someone had cut the power cord off about an inch outside the rear wall. I pulled the case and spliced in a new power cord and the device does power up. The only trace present is a spot with the beam finder depressed which can be moved with the X & Y controls and responds to brightness & focus. The only piece of test equipment I currently own is a multimeter but I will buy/borrow/rent as required. I have downloaded a set of manuals with the trouble shooting procedure. So, where to from here?

Re: Fast Rise/Fall Time Pulser

 

Hi Bob,
I have several forceps of different sizes. They are extremely handy for holding parts but kind of over kill for a tiny TD because the physical size and mass of the forceps is so much greater than the TD. Somewhere along the way I got some tiny little heatsink clips made exactly for this purpose and they are so light yet heat absorbing that they work much better for soldering delicate parts. They are marked Hunter on one side and 516 on the other side.

Dennis Tillman W7PF

-----Original Message-----
Sent: Thursday, October 12, 2017 9:44 AM
Subject: Re: [TekScopes] Fast Rise/Fall Time Pulser

I had Tek issue artery forceps circa 1969 that could be clamped on the lead of some tender little device while soldering to provide an alternate heat flow path.
Bob.


From: David Wise david_wise@... [TekScopes]
Sent: Thursday, October 12, 2017 9:26 AM
Subject: RE: [TekScopes] Fast Rise/Fall Time Pulser

Dennis, I think you're thinking of the 067-0681-01 TD Pulser. That's the John Addis design with 43-ohm resistor in the BNC.

I wonder if soldering the TD could be made safer by having an assistant spray the body with freezer while you solder the lead.
That's assuming steep gradient is less of a danger than overheating.

Dave Wise

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: Wednesday, October 11, 2017 10:37 PM
To: TekScopes@...
Subject: RE: [TekScopes] Fast Rise/Fall Time Pulser

Hi Hakan,
My apologies. I was confusing another Tek TD Pulse Generator (067-0513-00) I have with the 43 ohm resistor that is inside the Teflon dielectric.

One change manufacturing wanted to make was to lengthen the leads of the TD to make it easier to solder in place since the heat from soldering to the BNC was damaging the TDs. John had to prove to them that longer leads would increase the aberrations to get them to back down.

Dennis Tillman W7PF
------------------------------------
Posted by: "bobh" <bobh@...>
------------------------------------

NEW MEMBER

Robert Mustari
 

Hello all,

New guy here. My name is Robert (Bob) Mustari. I'm 71 years old and have been employed as a mechanical engineer for 40+ years. Along the way I've worked with some highly qualified EEs and a little has rubbed off. Enough to make me dangerous. Let me say right away that in no way do I consider myself an EE and as such expect to be humbled in this group early & often. Don't give it a second thought. I'm here to learn and pain is part of the process. I just bought a basket case Tek 465 from ebay so I'm soliciting any & all advice as to how to proceed. The serial number is unreadable but I suspect it's pretty early. For some unknown reason someone had cut the power cord off about an inch outside the rear wall. I pulled the case and spliced in a new power cord and the device does power up. The only trace present is a spot with the beam finder depressed which can be moved with the X & Y controls and responds to brightness & focus. The only piece of test equipment I currently own is a multimeter but I will buy/borrow/rent as required. I have downloaded a set of manuals with the trouble shooting procedure. So, where to from here?

Re: Fast Rise/Fall Time Pulser

 

Hi David,
I learn by taking things apart and looking at how they are made so I am sure I have taken apart a Tek product with a tiny pellet TD in it.

I wasn't very clear in my last email where I was trying to clear up my original reply. There were two things going on in my head at the same time. I did confuse the 43ohm resistor with the TD, but I also have something with a little pellet package TD in it. I believe what I'm thinking of is my Tek TD Pulse Generator (067-0513-00) or it might be the S-52 Pulse Generator Head.

Its times like these that make me think I have too many Tek toys. Then I take a deep breath and tell myself there is no such thing as having too many Tek toys. There is just not having enough space for them all.

Dennis Tillman W7PF

-----Original Message-----
Sent: Thursday, October 12, 2017 9:26 AM
Subject: RE: [TekScopes] Fast Rise/Fall Time Pulser

Dennis, I think you're thinking of the 067-0681-01 TD Pulser. That's the John Addis design with 43-ohm resistor in the BNC.

I wonder if soldering the TD could be made safer by having an assistant spray the body with freezer while you solder the lead.
That's assuming steep gradient is less of a danger than overheating.

Dave Wise

-----Original Message-----
Sent: Wednesday, October 11, 2017 10:37 PM
Subject: RE: [TekScopes] Fast Rise/Fall Time Pulser

Hi Hakan,
My apologies. I was confusing another Tek TD Pulse Generator (067-0513-00) I have with the 43 ohm resistor that is inside the Teflon dielectric.

One change manufacturing wanted to make was to lengthen the leads of the TD to make it easier to solder in place since the heat from soldering to the BNC was damaging the TDs. John had to prove to them that longer leads would increase the aberrations to get them to back down.

Dennis Tillman W7PF
------------------------------------
Posted by: David Wise <David_Wise@...>
------------------------------------

Re: TDS754 Power Supply Schematic? Or replacement board?

dnmeeks
 

Thanks Ed! After I took the PS board out I found that a 2700uF 10V cap had failed in a horrible way. Although not visible from the top, it had burned the FR4 under it. I think it leaked, and the electrolyte maybe caused leakage and burned the board. I've not seen that before. There is another same value right next to it, in parallel, and it had some leakage under it also, but not burned.
So I may be wrong about that transformer. The tape looks like it's melted into the wires, but maybe it is just wound tight.
So I am crossing my fingers that it's just those capacitors, and I'll wait until I get them replaced before I investigate anything else.
It was quite a mess. I had to cut about 1/2" square out of the board to get to clean FR4. Luckily it's a 2 layer board so it's easy to make repairs.
Dan

Re: Fast Rise/Fall Time Pulser

Brian Clarke <brianclarke01@...>
 

Called Spencer-Wells forceps in the UK – probably the original manufacturer. I have two sets – straight and curved – very useful as holding and heat-sinking devices. And they’re stainless steel; so, they don’t pick up solder easily.

73 de Brian, VK2GCE



From: TekScopes@... [mailto:TekScopes@...]
Sent: Friday, 13 October 2017 3:44 AM
To: TekScopes@...
Subject: Re: [TekScopes] Fast Rise/Fall Time Pulser





I had Tek issue artery forceps circa 1969 that could be clamped on the lead of some tender little device while soldering to provide an alternate heat flow path.
Bob.

From: David Wise david_wise@... <mailto:david_wise@...> [TekScopes]
Sent: Thursday, October 12, 2017 9:26 AM
To: TekScopes@... <mailto:TekScopes@...>
Subject: RE: [TekScopes] Fast Rise/Fall Time Pulser

Dennis, I think you're thinking of the 067-0681-01 TD Pulser. That's the John Addis design with 43-ohm resistor in the BNC.

I wonder if soldering the TD could be made safer by having an assistant spray the body with freezer while you solder the lead.
That's assuming steep gradient is less of a danger than overheating.

Dave Wise

-----Original Message-----
From: TekScopes@... <mailto:TekScopes@...> [mailto:TekScopes@...]
Sent: Wednesday, October 11, 2017 10:37 PM
To: TekScopes@... <mailto:TekScopes@...>
Subject: RE: [TekScopes] Fast Rise/Fall Time Pulser

Hi Hakan,
My apologies. I was confusing another Tek TD Pulse Generator (067-0513-00) I have with the 43 ohm resistor that is inside the Teflon dielectric.

One change manufacturing wanted to make was to lengthen the leads of the TD to make it easier to solder in place since the heat from soldering to the BNC was damaging the TDs. John had to prove to them that longer leads would increase the aberrations to get them to back down.

Dennis Tillman W7PF

[Non-text portions of this message have been removed]





[Non-text portions of this message have been removed]

Re: TDS754 Power Supply Schematic? Or replacement board?

Ed Breya
 

I think the PS circuits in the 754 are similar to those in the 544, which does have a little bit of schematic info available - check at Hakan's website.

I have both scopes, and one or the other - I forget which - had a PS problem, where the pilot supply crapped out, so it couldn't start up. From the 544 schematic, I figured out enough to ID the problem and fix it and mod it to improve the reliability. As I recall, there are two versions of the pilot supply topology, and I saw vestigial signs of either type in the board layout. One has a bipolar switching transistor in a self-oscillating design, while the other uses a TOPxxx SMPS IC (made by Power Integrations, Inc), which is in a TO-220 package. It's hard to tell which version it is until you can see the label. Either way, that tall skinny transformer is the one for the pilot supply, so it's all about that area of the board. The circuit isn't all that complicated, so you may be able to decipher it enough by inspection.

Ed

TDS754 Power Supply Schematic? Or replacement board?

dnmeeks
 

My beloved TDS754C (modified to 784) has crapped the bed.
From the smell and look, I believe I've found the part of the circuit that is bad. It's near U12, a tall transformer that's obviously overheated.
The rest of the board looks pristine. No bulging or leaking caps.
Does anyone have a schematic of this power board so I can try to fix it? I'll also entertain offers of parts units or a working power board.
Thanks in advance!
Dan

Re: Anybody have any Tek AVC-20 info? A 2252 Manual?

widgethunter
 

Walter;
Have two AVC-20s and a manual, I think.
Problem is that the unit requires "NTSC blackburst", or "Genlock" from a video generator to lock to.
Don't remember much more. I went with Tek 760s, instead...
Bernd Schroder

-----Original Message-----
From: @walter2 [TekScopes] <TekScopes@...>
To: TekScopes <TekScopes@...>
Sent: Wed, Oct 11, 2017 5:00 pm
Subject: [TekScopes] Anybody have any Tek AVC-20 info? A 2252 Manual?






Now that I am recovered from stuff day, back to Tek tinkering. I got a strange Tek gizmo, the mysterious AVC-20, supposedly for measuring audio phase on a vector display. I can't find any info beyond that short summary anywhere, so I am hoping some list member has a manual possibly?

also searching for a Tek 2252 service manual, only the user manual seems to be around.

dennis made it up for stuff day, and brought back lots of bits for the Tek vintage museum, so we are now cleaned out of Tek board assemblies, and I will kill that webpage shortly. you should be able to get them at some point from the museum, including known good 11K internal boards, and the impossible to find 11K blanking plug ins to keep the airflow correct.

all the best,
walter
sphere research corp.
walter2 -at- sphere.bc.ca


[Non-text portions of this message have been removed]









[Non-text portions of this message have been removed]

Re: Fast Rise/Fall Time Pulser

Dave Wise
 

The issue being discussed is the thermal load when soldering a new TD into place. During operation, heating is negligible.
The 067-0681-01 uses a 152-0177-02 - see W140's Tek wiki site. That wiki also has specs on Russian TD's. The one we want for this job - 1I308D - is expensive now.

David

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: Thursday, October 12, 2017 10:37 AM
To: TekScopes@...
Subject: Re: [TekScopes] Fast Rise/Fall Time Pulser

Hi David,

it is for sure, that the "core" of the generator needs to connections as short as possible and as free of parasitics as possible.
I think the "thermal load" of the TD is not so interesting.
What TD is used in that named puls generators ?

On the market are nice TD from Russia which are relatively cheap AND available.

Herbert





Am 12.10.2017 17:56, schrieb David Wise david_wise@... [TekScopes]:


The issue is lead length on the tunnel diode.

Dave

Re: Fast Rise/Fall Time Pulser

Herbert
 

Hi David,

it is for sure, that the "core" of the generator needs to connections as
short as possible and as free of parasitics as possible.
I think the "thermal load" of the TD is not so interesting.
What TD is used in that named puls generators ?

On the market are nice TD from Russia which are relatively cheap AND
available.

Herbert





Am 12.10.2017 17:56, schrieb David Wise david_wise@... [TekScopes]:



The issue is lead length on the tunnel diode.

Dave

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: Thursday, October 12, 2017 9:57 AM
To: TekScopes@...
Subject: Re: [TekScopes] Fast Rise/Fall Time Pulser

Hi David,

but this does not mean, that the connector needs to be connected
directly. A nice peace of semi rigid will give the same performance ?!

Herbert



Am 12.10.2017 17:40, schrieb David Wise david_wise@... [TekScopes]:


Minimize parasitic inductance and capacitance. When you're talking
picoseconds, a picofarad or nanohenry is huge.

Dave Wise

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: Thursday, October 12, 2017 9:39 AM
To: TekScopes@...
Subject: Re: [TekScopes] Fast Rise/Fall Time Pulser

Hello all,

can somebody enlighten me, why it is a need to have the tunnel diode
so near to the connector ???

Herbert


Am 12.10.2017 17:26, schrieb David Wise david_wise@...
[TekScopes]:


Dennis, I think you're thinking of the 067-0681-01 TD Pulser. That's
the John Addis design with 43-ohm resistor in the BNC.

I wonder if soldering the TD could be made safer by having an
assistant spray the body with freezer while you solder the lead.
That's assuming steep gradient is less of a danger than overheating.

Dave Wise


------------------------------------
Posted by: Measurement <measurement@...>
------------------------------------


------------------------------------

Yahoo Groups Links



Re: Fast Rise/Fall Time Pulser

Herbert
 

Hi David,

but this does not mean, that the connector needs to be connected
directly. A nice peace of semi rigid will give the same performance ?!

Herbert



Am 12.10.2017 17:40, schrieb David Wise david_wise@... [TekScopes]:



Minimize parasitic inductance and capacitance. When you're talking
picoseconds, a picofarad or nanohenry is huge.

Dave Wise

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: Thursday, October 12, 2017 9:39 AM
To: TekScopes@...
Subject: Re: [TekScopes] Fast Rise/Fall Time Pulser

Hello all,

can somebody enlighten me, why it is a need to have the tunnel diode so
near to the connector ???

Herbert


Am 12.10.2017 17:26, schrieb David Wise david_wise@... [TekScopes]:


Dennis, I think you're thinking of the 067-0681-01 TD Pulser. That's
the John Addis design with 43-ohm resistor in the BNC.

I wonder if soldering the TD could be made safer by having an
assistant spray the body with freezer while you solder the lead.
That's assuming steep gradient is less of a danger than overheating.

Dave Wise

Re: Fast Rise/Fall Time Pulser

Dave Wise
 

The issue is lead length on the tunnel diode.

Dave

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: Thursday, October 12, 2017 9:57 AM
To: TekScopes@...
Subject: Re: [TekScopes] Fast Rise/Fall Time Pulser

Hi David,

but this does not mean, that the connector needs to be connected directly. A nice peace of semi rigid will give the same performance ?!

Herbert



Am 12.10.2017 17:40, schrieb David Wise david_wise@... [TekScopes]:


Minimize parasitic inductance and capacitance. When you're talking
picoseconds, a picofarad or nanohenry is huge.

Dave Wise

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: Thursday, October 12, 2017 9:39 AM
To: TekScopes@...
Subject: Re: [TekScopes] Fast Rise/Fall Time Pulser

Hello all,

can somebody enlighten me, why it is a need to have the tunnel diode
so near to the connector ???

Herbert


Am 12.10.2017 17:26, schrieb David Wise david_wise@... [TekScopes]:


Dennis, I think you're thinking of the 067-0681-01 TD Pulser. That's
the John Addis design with 43-ohm resistor in the BNC.

I wonder if soldering the TD could be made safer by having an
assistant spray the body with freezer while you solder the lead.
That's assuming steep gradient is less of a danger than overheating.

Dave Wise


------------------------------------
Posted by: Measurement <measurement@...>
------------------------------------


------------------------------------

Yahoo Groups Links

Re: Fast Rise/Fall Time Pulser

Dave Wise
 

Even a 1/16" spring-loaded aluminum heatsink clamp is ungainly when you're working at this scale.

Dave

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: Thursday, October 12, 2017 9:44 AM
To: TekScopes@...
Subject: Re: [TekScopes] Fast Rise/Fall Time Pulser

I had Tek issue artery forceps circa 1969 that could be clamped on the lead of some tender little device while soldering to provide an alternate heat flow path.
Bob.


From: David Wise david_wise@... [TekScopes]
Sent: Thursday, October 12, 2017 9:26 AM
To: TekScopes@...
Subject: RE: [TekScopes] Fast Rise/Fall Time Pulser


Dennis, I think you're thinking of the 067-0681-01 TD Pulser. That's the John Addis design with 43-ohm resistor in the BNC.

I wonder if soldering the TD could be made safer by having an assistant spray the body with freezer while you solder the lead.
That's assuming steep gradient is less of a danger than overheating.

Dave Wise

Re: Fast Rise/Fall Time Pulser

bobh@joba.com
 

I had Tek issue artery forceps circa 1969 that could be clamped on the lead of some tender little device while soldering to provide an alternate heat flow path.
Bob.


From: David Wise david_wise@... [TekScopes]
Sent: Thursday, October 12, 2017 9:26 AM
To: TekScopes@...
Subject: RE: [TekScopes] Fast Rise/Fall Time Pulser


Dennis, I think you're thinking of the 067-0681-01 TD Pulser. That's the John Addis design with 43-ohm resistor in the BNC.

I wonder if soldering the TD could be made safer by having an assistant spray the body with freezer while you solder the lead.
That's assuming steep gradient is less of a danger than overheating.

Dave Wise

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: Wednesday, October 11, 2017 10:37 PM
To: TekScopes@...
Subject: RE: [TekScopes] Fast Rise/Fall Time Pulser

Hi Hakan,
My apologies. I was confusing another Tek TD Pulse Generator (067-0513-00) I have with the 43 ohm resistor that is inside the Teflon dielectric.

One change manufacturing wanted to make was to lengthen the leads of the TD to make it easier to solder in place since the heat from soldering to the BNC was damaging the TDs. John had to prove to them that longer leads would increase the aberrations to get them to back down.

Dennis Tillman W7PF

Re: Fast Rise/Fall Time Pulser

Dave Wise
 

Minimize parasitic inductance and capacitance. When you're talking picoseconds, a picofarad or nanohenry is huge.

Dave Wise

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: Thursday, October 12, 2017 9:39 AM
To: TekScopes@...
Subject: Re: [TekScopes] Fast Rise/Fall Time Pulser

Hello all,

can somebody enlighten me, why it is a need to have the tunnel diode so near to the connector ???

Herbert


Am 12.10.2017 17:26, schrieb David Wise david_wise@... [TekScopes]:


Dennis, I think you're thinking of the 067-0681-01 TD Pulser. That's
the John Addis design with 43-ohm resistor in the BNC.

I wonder if soldering the TD could be made safer by having an
assistant spray the body with freezer while you solder the lead.
That's assuming steep gradient is less of a danger than overheating.

Dave Wise

Re: Fast Rise/Fall Time Pulser

Herbert
 

Hello all,

can somebody enlighten me, why it is a need to have the tunnel diode so
near to the connector ???

Herbert


Am 12.10.2017 17:26, schrieb David Wise david_wise@... [TekScopes]:



Dennis, I think you're thinking of the 067-0681-01 TD Pulser. That's the
John Addis design with 43-ohm resistor in the BNC.

I wonder if soldering the TD could be made safer by having an assistant
spray the body with freezer while you solder the lead.
That's assuming steep gradient is less of a danger than overheating.

Dave Wise

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: Wednesday, October 11, 2017 10:37 PM
To: TekScopes@...
Subject: RE: [TekScopes] Fast Rise/Fall Time Pulser

Hi Hakan,
My apologies. I was confusing another Tek TD Pulse Generator
(067-0513-00) I have with the 43 ohm resistor that is inside the Teflon
dielectric.

One change manufacturing wanted to make was to lengthen the leads of the
TD to make it easier to solder in place since the heat from soldering to
the BNC was damaging the TDs. John had to prove to them that longer
leads would increase the aberrations to get them to back down.

Dennis Tillman W7PF

Re: Fast Rise/Fall Time Pulser

Dave Wise
 

Dennis, I think you're thinking of the 067-0681-01 TD Pulser. That's the John Addis design with 43-ohm resistor in the BNC.

I wonder if soldering the TD could be made safer by having an assistant spray the body with freezer while you solder the lead.
That's assuming steep gradient is less of a danger than overheating.

Dave Wise

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: Wednesday, October 11, 2017 10:37 PM
To: TekScopes@...
Subject: RE: [TekScopes] Fast Rise/Fall Time Pulser

Hi Hakan,
My apologies. I was confusing another Tek TD Pulse Generator (067-0513-00) I have with the 43 ohm resistor that is inside the Teflon dielectric.

One change manufacturing wanted to make was to lengthen the leads of the TD to make it easier to solder in place since the heat from soldering to the BNC was damaging the TDs. John had to prove to them that longer leads would increase the aberrations to get them to back down.

Dennis Tillman W7PF