Date   
Re: How Many Scopes?

Leon Robinson
 

My list.
453A502535A545A5857903  2Lavoie LA265Heathkit IO-SO-4235  3

If I haven't forgotten any.
 Leon Robinson    K5JLR

Political Correctness is a Political Disease.


Mute This Topic: https://groups.io/mt/28630392/89198
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Re: How Many Scopes?

Leon Robinson
 

OOP's Leon Robinson    K5JLR

Political Correctness is a Political Disease.

From: Leon Robinson <leon-robinson@...>
To: "TekScopes@groups.io" <TekScopes@groups.io>
Sent: Sunday, December 9, 2018 6:58 PM
Subject: Re: [TekScopes] How Many Scopes?

My list.
453A
502
535A
545A
585
7903  2
Lavoie LA265
Heathkit IO-SO-4235  3

If I haven't forgotten any.
 Leon Robinson    K5JLR

Political Correctness is a Political Disease.


Mute This Topic: https://groups.io/mt/28630392/89198
Group Owner: TekScopes+owner@groups.io
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Re: TIP: Current Probes ...

Dave Brown
 

Hey Craig- try 'Rogowski'............ I have used them extensively, BTW

DaveB NZ-( the pedant!!)

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Craig
Sawyers
Sent: Monday, December 10, 2018 13:32
To: TekScopes@groups.io
Subject: Re: [TekScopes] TIP: Current Probes ...

Design a Rogowsky coil. With the right design you can go from about 200Hz to
5MHz. Needs a wideband active integrator since a Rogowsky output is
proportional to dI/di.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
stefan_trethan
Sent: 09 December 2018 19:52
To: TekScopes@groups.io
Subject: Re: [TekScopes] TIP: Current Probes ...

To answer my own question:
http://www.ti.com/lit/ds/symlink/drv425.pdf

But only 47kHz, I'd like something like that with a couple hundred kHz....

ST

On Sun, Dec 9, 2018 at 8:38 PM stefan_trethan <stefan_trethan@...>
wrote:

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

Are there any cheap approximations of the Iprober 520 fluxgate
sensor current probe?
Maybe some sort of IC?

ST

On Sun, Dec 9, 2018 at 8:19 PM David Slipper <softfoot@...>
wrote:


I did look at making one with a Hall sensor - the electronics
isn't a problem but the difficulty arises (for me at least) in
cutting the slot in a ferrite ring to put the sensor in or even
splitting the core to make a clamp. I guess it's easier if you have
access to the right tools.

Any ways, this works well for me :-)

On 09/12/2018 18:52, stefan_trethan wrote:
If you only need low frequency the LEM brand hall effect
sensors, I believe Allegro also makes chip based ones, can be an
option.
Also remember you can put 10 turns through if you need more
sensitivity (insertion impedance permitting).



Re: Tektronix 221 board parts

Michael A. Terrell
 

-----Original Message-----
From: "scott mc neill via Groups.Io" <scott.2303=yahoo.co.uk@groups.io>
Sent: Dec 9, 2018 11:17 AM
To: TekScopes@groups.io
Subject: [TekScopes] Tektronix 221 board parts

I am trying to find a replacement for the transistor MPS H34
Scott


Re: TIP: Current Probes ...

Dave Brown
 

Re current clamps - It does not seem to be generally known that the stock
standard Fluke 80i-600 when used with a 100 ohm burden- is flat out to
around 50 kHz or more. No doubt some other std current clamps will give
similar results but I've not bothered to check.
DaveB, NZ

Re: TIP: Current Probes ...

stefan_trethan
 

I know more about Rogowski coils than I am comfortable with, having
designed one that will work down to well below 0.1Hz over the last
couple years, but only under certain conditions which I can't discuss.

But I'm looking for a spot or (small area) sensor now. Something I can
use like a voltage probe on the surface of a PCB for example.
It should go down to real DC. Maybe a dual path solution is called
for, similar to the standard current probes with a pickup coil and
that TI sensor.
Just open circuit without the ferrite core, maybe without compensation even.
Or maybe I'll just buy a damn iporober 520 one day... I just hated
their marketing wank back when it came out.

ST
On Mon, Dec 10, 2018 at 1:32 AM Craig Sawyers
<c.sawyers@...> wrote:

Design a Rogowsky coil. With the right design you can go from about 200Hz to 5MHz. Needs a wideband
active integrator since a Rogowsky output is proportional to dI/di.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of stefan_trethan
Sent: 09 December 2018 19:52
To: TekScopes@groups.io
Subject: Re: [TekScopes] TIP: Current Probes ...

To answer my own question:
http://www.ti.com/lit/ds/symlink/drv425.pdf

But only 47kHz, I'd like something like that with a couple hundred kHz....

ST

On Sun, Dec 9, 2018 at 8:38 PM stefan_trethan <stefan_trethan@...> wrote:

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

Are there any cheap approximations of the Iprober 520 fluxgate sensor
current probe?
Maybe some sort of IC?

ST

On Sun, Dec 9, 2018 at 8:19 PM David Slipper <softfoot@...> wrote:


I did look at making one with a Hall sensor - the electronics isn't
a problem but the difficulty arises (for me at least) in cutting the
slot in a ferrite ring to put the sensor in or even splitting the
core to make a clamp. I guess it's easier if you have access to the right tools.

Any ways, this works well for me :-)

On 09/12/2018 18:52, stefan_trethan wrote:
If you only need low frequency the LEM brand hall effect sensors,
I believe Allegro also makes chip based ones, can be an option.
Also remember you can put 10 turns through if you need more
sensitivity (insertion impedance permitting).






Re: AVR Scope Clock

John Clark
 

As a last follow up, I received my AVR Scope Clock from Dutchtronix and have it built. It is a very nice little gadget...a bit of a novelty but it was fun to build and now even my kids think that my 475, what they call the old boat anchor, is actually something useful. They weren't home when I used the scope to fix the UPS power supply for my modem, router, switch, etc. Now if they could only figure out how to watch Netflix and YouTube on it they might appreciate the old girl! No matter though...their old man likes it!

John

On Thu, Nov 29, 2018 at 07:49 PM, John Clark wrote:


Thanks to everyone for all the assistance on the scope clock. I received an
email back this evening that parts had come in and he needed my PayPal ID so
he could send me a PayPal invoice. I know it's a bit of a novelty but for
someone who owns a real nice 475, but who doesn't use it very often, it will
give me a reason to turn it on in my den/office when company is around.

John
________________________________
From: TekScopes@groups.io <TekScopes@groups.io> on behalf of
johnasolecki@... <johnasolecki@...>
Sent: Thursday, November 29, 2018 9:23 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] AVR Scope Clock

I just received one of his clocks several weeks ago, I had to keep checking
back as he seems to run out quickly. It appears to have more functions than
any other one I looked at.

John



Re: AVR Scope Clock

Jack Reynolds
 

Glad to hear that your kids got at least some pleasure out of it.  When I was in the high school electronics lab all we had for scopes were vac tube Eicos and Heathkits which the students had built at one time or another.  The teacher managed to get a salesman to loan us a pair of Fairchild solid state scopes for an indefinite period and those of us who could get near them were fascinated by calibrated scopes.  We spent weeks building the circuits required to convert the signals in an old tv from what was required to drive a picture tube magnetically to a scope CRT electrostatically.  We wanted to impress the hell out of the parents who would be coming to the annual open house evening! What a bust!  The comments from the parents ranged from "Whats the big deal its just a little TV" to "Heck its too small to watch"

Jack

On 12/10/2018 12:31 AM, John Clark wrote:
As a last follow up, I received my AVR Scope Clock from Dutchtronix and have it built. It is a very nice little gadget...a bit of a novelty but it was fun to build and now even my kids think that my 475, what they call the old boat anchor, is actually something useful. They weren't home when I used the scope to fix the UPS power supply for my modem, router, switch, etc. Now if they could only figure out how to watch Netflix and YouTube on it they might appreciate the old girl! No matter though...their old man likes it!

John

On Thu, Nov 29, 2018 at 07:49 PM, John Clark wrote:

Thanks to everyone for all the assistance on the scope clock. I received an
email back this evening that parts had come in and he needed my PayPal ID so
he could send me a PayPal invoice. I know it's a bit of a novelty but for
someone who owns a real nice 475, but who doesn't use it very often, it will
give me a reason to turn it on in my den/office when company is around.

John
________________________________
From: TekScopes@groups.io <TekScopes@groups.io> on behalf of
johnasolecki@... <johnasolecki@...>
Sent: Thursday, November 29, 2018 9:23 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] AVR Scope Clock

I just received one of his clocks several weeks ago, I had to keep checking
back as he seems to run out quickly. It appears to have more functions than
any other one I looked at.

John



Re: Russian Tunnel Diodes

garp66
 

The Russian Tunnel Diodes on eBay can be found by searching for the listing titled:

"Switching tunnel diodes 1I308D" 10pcs

The eBay seller is: "russhamma"

The specs listed for these TD's are:

Maximal parameters Average parameters Тk.мах
Т=25°C Т=25°C (Тп.)

Iп. Uп. Sd. Ld rп. Iп./Iv. Uпр. прi Iоbр. °C
(DIп.) (Uпр.) (Lkор) Iпр.
mА mV pF nGn Ohm mV mА mkА
1 2 3 4 5 6 7 8 9 10 11
1I308А 5,0 (0,5) 100 1,5...5,0 0,35 - 5 - 6 - 70
1I308B 5,0 (0,5) 110 0,7...2,0 0,35 - 5 - 4 - 70
1I308V 10,0 (1,0) 110 4,0...10 0,35 - 5 - 20 - 70
1I308G 10,0 (1,0) 120 1,5...5,0 0,35 - 5 - 15 - 70
1I308D 10,0 (1,0) 130 0,8...2,0 0,35 - 5 - 6 - 70
1I308E 20 (2,0) 140 3,0...15 0,35 - 5 - 20 - 70
1I308J 20 (2,0) 160 1,0...4,0 0,35 - 5 - 8 - 70
1I308I 50 (5,0) 150 5,0...20 0,35 - 5 - 40 - 70
1I308K 50 (5,0) 180 2,3...8,0 0,35 - 5 - 20 - 70

Re: Tek 371 test fixture

Roy Morgan
 

I am not familiar with the 371 or its test fixtures, but I have some experience that may help:

At Teradyne (in the 70’s), the discrete devices test equipment operated with kelvin connections out to the leads of the device under test - all the way from the instrument innards to the contacts on the device under test.

For each lead (collector, for example) there was a “force” lead and a “sense” lead. The maximum current might have been 10 amperes - memory of this detail has faded. The wires within the system out to the connectors for the test fixtures may have been No. 16 or 18. (They were teflon, for leakage control under low current test conditions.) That’s for both force and sense. The tests occurred in very brief pulses, maybe on the order of 5 milliseconds. The currents in the 371 may well be of longer duration, and also repeated for a series of base currents, for instance. So larger conductor size may well be needed.

If you can examine the wires out to the test fixture connector, this will tell you what size wire to use, I think.

A further note on test fixture connectors - most of them were made of diallyl phthalate. This stuff is blue, rather costly, and needed for extremely low leakage.

I look forward to your success.

Roy


On Nov 2, 2018, at 9:04 PM, oliver johnson via Groups.Io <nojjamaica=yahoo.com@groups.io> wrote:

I am working on a tek 371 with a friend of mine , it has no test fixture and these things are never seen on ebay , so our idea is to make one . We are in the process of using a test fixture which will be modded to house a transistor with sense leads .

I am wondering that because this is a high current and high voltage setup what would be an appropriate wire in addition would the length be critical
Roy Morgan
K1LKY since 1958
k1lky68@...

GHz Scope +modules discussion

garp66
 

For those with experience having, using GHz scopes, up to 20 to 50 GHz:
to help the uninitiated here in selecting a used, slightly older "affordable" GHz scope.

Can you briefly summarize your Selection experience & Pros & Cons of Tek ( 1180x, or other affordable models)
vs. HP (54710, 54720d, 54120B having TDR, trigger and channels, Or other affordable models ) ?

by affordable, I mean a few hundred $ (Scope + Modules)

Experts:
Specifically, I'd like to know about Experiences & the differences between a Tek 180x vs. the HP 54720d ... & what modules to get.


thank you,

Re: Tektronix 221 board parts

scott mc neill <scott.2303@...>
 

Hi,
Q464 and Q466
Regards,
Scott

Re: GHz Scope +modules discussion

Jim Ford
 

Hi, Garp. 
I used both HP 54120 and Tektronix CSA803 back about 25 years ago.  Hard to go wrong with either.  Do you want to drive a Lincoln or a Cadillac? 54120 had a separate box for triggering and used a resistive splitter to go to the trigger box and the scope for sampling.  A bit cumbersome and took up bench space.  CSA803, IIRC, had triggering "in the box" or maybe you needed to run a separate signal to an SMA trigger input; my memory fails me.
My personal preference is for Tek scopes and logic analyzers and for HP microwave gear.  Used a good amount of both in the last 30 years.
Be sure to check out w140.com/TekWiki for all things Tek.  AFAIK, there is no HP wiki, unfortunately.   If I were retired, I would create one.
Good luck!
Jim F
Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------From: garp66 <@garp66> Date: 12/11/18 8:45 AM (GMT-08:00) To: TekScopes@groups.io Subject: [TekScopes] GHz Scope +modules discussion

For those with experience having, using GHz scopes,  up to 20 to 50 GHz:
  to help  the uninitiated here in selecting a used, slightly older "affordable" GHz scope.

  Can you briefly summarize your Selection experience  & Pros & Cons   of  Tek  ( 1180x, or other affordable models)
      vs.    HP (54710, 54720d, 54120B having TDR, trigger and channels,  Or other affordable models ) ?

by affordable, I mean a few hundred $ (Scope + Modules)

Experts:
    Specifically, I'd like to know about Experiences & the differences between a Tek 180x vs. the HP 54720d ... & what modules to get.

  
thank you,

Re: Oscilloscope 221

 

The original is rated 45 volts. Does it really see 45 volts ? If not it looks like a 2N2369 would do but is only rated 15 volts. Take a look at the schematic.

Also note your original is emitter in the middle. Reminds me of an oscillator in a UHF tuner. They usually had the emitter in the middle.

If you can use the 2N2369 Digikey has them for $2.34. The BF224 is probably better but I don't see where to get any. Google comes up with total BS. Also with the BF224 the emitter is in the middle so no bending the leads around.

Re: Transistor type MPS H34 in 221 Vertical Amp

ArtekManuals
 

Scott

OK� so to quote Siri ..."Here's what I found I found on the WEB", and other places.

According to the 221 service manual Q464 is Tektronix part number 151-0452-00, Tektronix is listed as the "Source" but it could also be any number of sources and then sorted by Tektronix for some specific characteristic� (ft , Beta etc)� The Tektronix semiconductor cross reference lists 151-0452-00 as a Tektronix "TRCO129 family"� , "medium frequency/low beta" ???? BETA in the cross reference is spced as 70 and Vceo breakdown of 55 volts and Ic of 10ma ( that seems low to me ???). The NTE161 ( see below) is a 50ma part ?

The MPSH34 crosses to a NTE161 VHF/UHF Amp, http://www.nteinc.com/search.php. None of the Tektronix numbers cross directly to anything at NTE

Since the 221 is only a 5MHz scope they cant be anything too exotic. Given the way they are used as pair in the vertical output amp , matching them for BETA might be useful

Hope this gives you some clues

Dave
manuals@...

On 12/11/2018 2:25 PM, scott mc neill wrote:
Hi,
Used as Q464 and Q466, Oscilloscope type 221,

Regards,
Scott
--
Dave
Manuals@...
www.ArtekManuals.com

Re: Looking for 604 XY monitor

Bill (Doc) Courtright
 

Rick,Does it have to be a 604 specifically? 

Bill

-----Original Message-----
From: rick via Groups.Io <echo7even=yahoo.com@groups.io>
To: TekScopes <TekScopes@groups.io>
Sent: Fri, Dec 7, 2018 10:20 am
Subject: [TekScopes] Looking for 604 XY monitor

I'm looking for a 604, my old one just bit the dust.. something in the HV supply keeps popping the 1AMP fuse.. it had previous problems with the +215 which i managed to repair but this is getting annoying so thinking it might be time for replacement

thanks!
-rick

TDS420 completed

Brendan
 

Finally finished up a new to me TDS420. Every single SMD cap was leaking and has been replaced also every cap on the SMPS was leaking and those were replaced. Passes all startup self tests.https://groups.io/g/TekScopes/photo/80171/0?p=Name,,,20,1,0,0 Pretty easy project. Now back to the 468 that has been plaguing me for months. If I can't figure it out in the next few days I'm gong to wait until I can find a parts unit and start swapping boards.

Re: Looking for 604 XY monitor

Roy Morgan
 

You could suspect the filter caps. They may have died.


On Dec 11, 2018, at 7:03 PM, Bill (Doc) Courtright via Groups.Io <doxemf=aol.com@groups.io> wrote:

Rick,Does it have to be a 604 specifically?

Bill
-----Original Message-----
From: rick via Groups.Io <echo7even=yahoo.com@groups.io>
To: TekScopes <TekScopes@groups.io>
Sent: Fri, Dec 7, 2018 10:20 am
Subject: [TekScopes] Looking for 604 XY monitor

I'm looking for a 604, my old one just bit the dust.. something in the HV supply keeps popping the 1AMP fuse..
Roy Morgan
K1LKY since 1958
k1lky68@...

Re: Oscilloscope 221

KeepIt SimpleStupid
 

https://www.utsource.net/sch/MPSH34
I use these guys a fair bit.

On Tuesday, December 11, 2018, 4:45:08 PM EST, Jeff Urban <@JURB> wrote:

The original is rated 45 volts. Does it really see 45 volts ? If not it looks like a 2N2369 would do but is only rated 15 volts. Take a look at the schematic.

Also note your original is emitter in the middle. Reminds me of an oscillator in a UHF tuner. They usually had the emitter in the middle.

If you can use the 2N2369 Digikey has them for $2.34. The BF224 is probably better but I don't see where to get any. Google comes up with total BS. Also with the BF224 the emitter is in the middle so no bending the leads around.

2465/2467 power supply outside chassis

thespin@...
 

Has anyone debugged the 2465 power supply by running it outside the unit? Can it be hooked up to line voltage and run, or is it necessary to load up the rails with resistors so it can regulate properly? If anyone has done this, would they mind sharing the proper resistors?