Date   

Posting Problems cured!

tss_steve_990
 

Thanks to those who explained that one can post to this group through one's regular email program. I thought new topics had to be entered from Yahoo's posting thingy.

If this message posts, my problems are over, because my email program never eats my messages before I get to press "send".

Thanks again,
Steve Hogan


deoxit and progold

tss_steve_990
 

I will try to keep this short and sweet so I don't waste anymore time
writing a detailed instructions on how to use these products to clean
the fine gold-plated contacts on the vertical amplifiers and the
mainboards of scopes like my 475. Several folks have recommended the
deoxit product from Caig laboratories. <www.caig.com> and it seems
that deoxit is the right product to clean contacts that have visible
contamination. Caig recommends that the progold product be used as a
final step. It is designed to prevent dendrite corrosion of the base
metal throught the porous gold plating. The alchohol/typing paper
contact cleaning method will remove dirt, oils, grime and wipe the
dendrite corrosion at the surface off. Without something to stop the
corrosion, however, the contact resistance will start to climb almost
immediately. Since the progold kills the corrosion growth, the
contacts stay low resistance for a very long time (up to years). The
high temperature version of progold is very suitable for tube pins
and sockets. This stuff must be used very sparingly!!!! A drop at
the end of a toothpick is plenty. Be very careful to keep all
chemicals far away from anything phenolic(switch wafers, etc) since
they are very porous and will soak up anything.

Please let me know if anyone else has had experience with these
products, either good or bad.

Steve Hogan


Post problems

tss_steve_990
 

I just spent 30 minutes composing a message here and I hit backspace
and the whole message disappeared. I am so frustrated with this
crappy posting program. I lost 2 other posts yesterday. I'm getting
to the point that I don't want to waste my time anymore because by
the time I get my message composed some accidental keystroke loses it
forever.

Very Frustrated.
Steve


Re: Input RC Standardizers

Craig Sawyers <c.sawyers@...>
 

Hi John

Tektronix part no. 011-0073-00, time constant 1 megohm
x 15 pF; attenuation 2X.

What sort of network lives inside the RC standardizer? I'd like to
build one; I imagine a few other folks need one too!
They are a parallel combination of a resistor, a fixed ceramic capacitor,
and a variable capacitor. I think the resistor is always 1M. The 15pF one
has a 12pF fixed capacitor, and a variable 1.5-7pF cap.

Of course, that begs the question - how to adjust the variable cap? Have a
look in the archives for Stan's suggested method...basically use a bridge to
set the input cap of a plug-in to nominal. Then plug in the standardiser,
and apply a square wave. Adjust the standardiser to give flat top.

You need to have the PI powered when setting using the bridge - the input C
is dependent on having bias on the input devices, particulaly if they are
JFETs. Then you have to get the bridge real close to the PI to reduce
parasitic C. Or use a 130LC. But that uses a UHF connector, and if you use
a UHF-BNC adaptor, that adds about 2pF - it is all a bit of a nightmare
frankly.

Now use the standardiser to adjust all your PI's to the same nominal input
C. The idea is not to have to tweak a scope probe as you move from PI to
PI. So is it really worth it?

Craig


Re: Input RC Standardizers

zenith5106 <zenith@...>
 

--- In TekScopes@yahoogroups.com, "John Doran" <johnd@e...> wrote:

Howdy!

Tektronix specifies the use of "input RC standardizers" in their
calibration procedures for vertical input attenuators. For example,
the procedure for their 1A2 plug-in unit specifies:

Tektronix part no. 011-0073-00, time constant 1 megohm
x 15 pF; attenuation 2X.

What sort of network lives inside the RC standardizer? I'd like to
build one; I imagine a few other folks need one too!

-John
---------
John,
It's a 1 Mohm resistor in parallell with one fixed and one variable
capacitor connected between the input and output of the box.
I placed a copy of the old data sheet at
http://w1.871.telia.com/~u87138090/011007300.jpg
/Zenith


Input RC Standardizers

John Doran <johnd@...>
 

Howdy!

Tektronix specifies the use of "input RC standardizers" in their
calibration procedures for vertical input attenuators. For example,
the procedure for their 1A2 plug-in unit specifies:

Tektronix part no. 011-0073-00, time constant 1 megohm
x 15 pF; attenuation 2X.

What sort of network lives inside the RC standardizer? I'd like to
build one; I imagine a few other folks need one too!

-John


'Triple-decker' 7104?

uclpanda <t.phillips@...>
 

Hi;
Browsing ebay, looking at cover of Tek catalog 1974,
what appears to be a 7104(?) with a 'second storey'
between the CRT unit and the plug-in frame.
Could anyone enlighten me as to what it was, please?
I may have the exact 7xxx model wrong!
many thanks.
Tim.


Looking for Tek Appnotes

uclpanda <t.phillips@...>
 

Hi;
I am trying to get hold of the following (old)
Application Notes for the 5000-series scopes:
AX-4462 Biophysical data retrieval.
AX-3746 Recording nerve activity.
referred to in a Tek catalog 1984.(P286)
Also a copy of Strong's book on Biophysical
Measurements. Any pointers gratefully recieved.
I found nothing on ebay so far.
many thanks.


Re: RM503 - The story continues.

Denton, Adam (Exchange)
 

Aaah, you are in the same boat as i was. My 564B's 3.3kV supply
was leaking to ground thru the CRT filament supply also.
On the 564 the filly is driven from the (giant) main power
transformer so replacing the whole thing seemed dubious.

To make a long story short, I unwound the secondary of an
(ancient) radio shack 6.3V transformer, carefully put 2
layers of electrical tape on it and everywhere, and re-wound
it. Worked. *but* in 2 weeks guess what, broke down.
I think it is the plastic part where the leads go.
I repeated the operation but this time it broke down in a day,
again confirming it's the plastic part, not the tape.
The tape I verified by just seeing if the unloaded supply
would arc thru it. It didn't.

So I'm planning another rewind, but i am in need of a core
where the sec is totally isolated from the primary -- i
have a few 'formers like that but they are big 2A types
and i'd rather not waste them. The problem is, it's a
major hassle to re-wind a 'former because getting the E's
and I's apart is a MAJOR headache! The actual rewinding
operation only took about 2 hours including taping,
but disassembling the 'former the 1st time is a dangerous
and un-fun operation. That resin-like stuff that glues
the former is very tough, and you can't use the obvious
(propane torch) since that would melt the plastic form.
Came down to a sharp chisel and tapping with a hammer,
one layer at a time.

But it can be done. Leave NO part of the secondary
uncovered with tape, and there must be no gaps in the
tape either.

Another option would be to heist the core of an old
TV flyback (or vertical pincushion).
These cores are easy to take apart, trivial to wind
(no plastic needed). The problem is they're useless
at 50/60 Hz so you have to build a driver to power
them at e.g. 1-10kHz.

Another option is to junk the scope. I am considering
that option too :-( [it is only 10 MHz]

(funny, out the 1,000 resistors/caps/diodes/transisitors/tubes
in the beast, maybe there are only 2 or 3 components
that are impossible or prohibitively expensive to replace.
(CRT, main power 'former, and HV 'former. No hybrids!)
SO, Murphy's law applies and thus it one of the 2 or 3
dilly-parts that breaks! Figures!!)

----
2) Rewind the 6.3v winding on the transformer. It appears to be outside
winding on the device, so it should not be that hard.
3) Install a separate 6.3v transformer to supply the CRT heater voltage.


***********************************************************************
Bear Stearns is not responsible for any recommendation, solicitation,
offer or agreement or any information about any transaction, customer
account or account activity contained in this communication.
***********************************************************************


Re: p6032 Probe

Craig Sawyers <c.sawyers@...>
 

This is a cathode follower probe, intended for the 1S1 sampling plug-in. It
is good from DC to 850MHz, but goes beyond that. Depending on attenuator
head, it has a loading of 1.3pF (1000x) to 3.6pF (10x) in parallel with
10M. Load resistance at the GR connector is 50 ohms.

Look upon it as a big FET probe, and you will not be far wrong.

The power connector interfaces with a socket on the front of the 1S1, and
needs the following voltages:

A - ground
B, C - 12.6V at 180mA
D - +100V

These probes give a very clean response - I'll send you a picture of what
they are capable of.

Craig

-----Original Message-----
From: penguin2001au [mailto:j.foster@mmb.usyd.edu.au]
Sent: 17 September 2003 01:55
To: TekScopes@yahoogroups.com
Subject: [TekScopes] p6032 Probe


Hi:

Does anybody have any infomation on this probe?
It is a cathode follower type and has a GR connector for the signal
and a small four pin plug for power.
It does not appear on the reprise.com list.

Regards: John F.





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Re: p6032 Probe

Robert Morein <morepub@...>
 

I had a pair I sold to charlesmorris@direcway.com.

The probe was specified for the 1GHz 661 sampling scope.
Charles has the instruction manual.

----- Original Message -----
From: penguin2001au
To: TekScopes@yahoogroups.com
Sent: Tuesday, September 16, 2003 8:54 PM
Subject: [TekScopes] p6032 Probe


Hi:

Does anybody have any infomation on this probe?
It is a cathode follower type and has a GR connector for the signal
and a small four pin plug for power.
It does not appear on the reprise.com list.

Regards: John F.


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p6032 Probe

penguin2001au <j.foster@...>
 

Hi:

Does anybody have any infomation on this probe?
It is a cathode follower type and has a GR connector for the signal
and a small four pin plug for power.
It does not appear on the reprise.com list.

Regards: John F.


RM503 - The story continues.

doug_jackson@...
 

Hi,

Thanks for the advice regarding caps. I have checked them, and they
appear to be operational.

I spent some more time working on the PSU last night. Finally, I lifted
the 3kv rectifier (5642) and the supplies came up beautifully!

Further investigation revealed 6k ohm of leakage between the 190V (pin
9,8) and the 6v (CRT heater pin 6,7) windings of the primary transformer
T601.

I have cleaned the area with ethyl alcohol, in case the leakage was caused
by surface oils, but it is still there.

The way I see it, I have a couple of possible solutions;

1) Obtain a replacement transformer. (Tec part # 120-203) - this
component is probably made from unobtanium.
2) Rewind the 6.3v winding on the transformer. It appears to be outside
winding on the device, so it should not be that hard.
3) Install a separate 6.3v transformer to supply the CRT heater voltage.

Can anybody provide any extra information on the rewinding options? I
*really* dont want to install a separate transformer if I can help it.

Alternately, does anybody on the list have a transformer that they would
be willing to part with, or could name a supplier that would be able to
supply one (for less than the cost of my mortgage!)

regards.

Doug Jackson
National Manager - Managed Services (ACT)
Citadel Securix Pty Ltd

Level 1, 10 Moore St
Canberra ACT 2601
Ph: (612) 6290 9011
Fx: (612) 6262 6152
Mob: 0414 986 878

Web: www.citadel.com.au
Melbourne - Sydney - Canberra - Brisbane - Hong Kong - Atlanta

Any pricing or time figures contained within this email are indicative
only, and have been provided for planning purposes only. Please request a
quotation from your sales representative prior to undertaking any work.



CAUTION - The information in this message may be of a privileged or confidential nature intended only for the use of the addressee or someone authorised to receive the addressee's e-mail. If you are not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this e-mail is strictly prohibited. If you have received this email in error please notify postmaster@citadel.com.au. Any views expressed in this message are those of the individual
sender and may not necessarily reflect the views of Citadel Securix.
Feel free to visit the Citadel Securix website! Click below.
http://www.citadel.com.au


Re: Tek 310: 10Ω dropping resistors for diode bridges

stan mcintosh <mcintosh@...>
 

Ooops! After this message, I looked more closely at the schematic. I thought I was reading a 7V drop across the dropping resistor for the -150V line. The decimal point was not that obvious... until I looked for it.

Thanks.

stan

----- Original Message -----
From: Carl E. Davidson
To: TekScopes@yahoogroups.com
Sent: Tuesday, September 16, 2003 11:20 AM
Subject: [TekScopes] Re: Tek 310: 10Ω dropping resistors for diode bridges


10 ohm 1 Watt resistors are all that's needed here (this is what
Tektronix used in the later model 310A that had silicon diode
rectifiers). The purpose of these resistors is to limit the
surge current through the rectifier diodes when power is first
applied (when the filter capacitors essentially represent a
short circuit for the first few milliseconds).

Carl


--- In TekScopes@yahoogroups.com, "stan mcintosh" <mcintosh@t...> wrote:
> Several people have emphasized that I need to be sure to include
10Ω dropping resistors for the silicon diode bridges that are
replacing the selenium bridges.
>
> Question: what wattage? Seems like 10W will be good for the -150
line, but I don't have more than one 10Ω/10W resistor in le boxe du
junque. Is 10W overkill for the other two bridges? If not, I can go
by and see if Radio Shack still carries them.
>
> stan
>
> [Non-text portions of this message have been removed]


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Re: Tek 310: 10Ω dropping resistors for diode bridges

Carl E. Davidson <carlhpretired@...>
 

10 ohm 1 Watt resistors are all that's needed here (this is what
Tektronix used in the later model 310A that had silicon diode
rectifiers). The purpose of these resistors is to limit the
surge current through the rectifier diodes when power is first
applied (when the filter capacitors essentially represent a
short circuit for the first few milliseconds).

Carl


--- In TekScopes@yahoogroups.com, "stan mcintosh" <mcintosh@t...> wrote:
Several people have emphasized that I need to be sure to include
10Ω dropping resistors for the silicon diode bridges that are
replacing the selenium bridges.

Question: what wattage? Seems like 10W will be good for the -150
line, but I don't have more than one 10Ω/10W resistor in le boxe du
junque. Is 10W overkill for the other two bridges? If not, I can go
by and see if Radio Shack still carries them.

stan

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


Tek 310: 10Ω dropping resistors for diode bridges

stan mcintosh <mcintosh@...>
 

Several people have emphasized that I need to be sure to include 10Ω dropping resistors for the silicon diode bridges that are replacing the selenium bridges.

Question: what wattage? Seems like 10W will be good for the -150 line, but I don't have more than one 10Ω/10W resistor in le boxe du junque. Is 10W overkill for the other two bridges? If not, I can go by and see if Radio Shack still carries them.

stan

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


Re: Search cross references for a Diodes for Tek 2211

magicdibool <magicdibool@...>
 

Ok, Thanks for all your answers

I will buy on Radiospares the Diode 1N5402.

Thanks John B for the means of the the markings on the diode
And it's the first time that they are a problem on this Oscilloscope

Thanks a lot for your help

Cédric



--- In TekScopes@yahoogroups.com, Fred Olsen <fwolsen@e...> wrote:
magicdibool wrote:
ZM
IN
5402
9010
Cedric, as has been said that is an ordinary diode. However, do
take
note that when you search for or enquire about the part be sure to
look
for a 1N5402, >>1<<N5402, not "I".

The "9010" is only the date code; week 10 of 1990.

Best of luck,
Fred
--
<><
--
Outgoing checked by Norton AV


Re: Search cross references for a Diodes for Tek 2211

eboytoronto
 

Hi,

This diode is 3A 100V generic Line frequency type rectifier. The markings:

ZM identifies the manufacturer or their location

IN
5402

Is the JEDEC part Number.

9010

Is the date code: 10th week of 1990.

The diode can be replaced with 1N5402,3,4,5,6 These are progressively high working voltages.

Just one word of caution:

If the diode looks like it is in the secondary side of a switch mode power supply and the soldering looks like it has been replaced before, then it should probably be a fast recovery diode. I would recommend MUR420 or similar from Motorola (now On-semi).

Maybe another member of the group can comment ?

Regards,


John Barnes

---------- Original Message ----------------------------------
From: "magicdibool" <magicdibool@freesurf.fr>
Date: Tue, 16 Sep 2003 13:13:11 -0000

I have a problem with a Tektronix scopes 2211.
The diode CR903 of the power supply board is HS

On the diode, it's wright
ZM
IN
5402
9010

I am looking for a cross reference.
I had looking on site http://www.sphere.bc.ca/test/tekequiv.html
but I didn't found any

Can you help me ???



Thanks



Cedric





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Re: Search cross references for a Diodes for Tek 2211

Craig Sawyers <c.sawyers@...>
 

On the diode, it's wright
ZM
IN
5402
9010
That is a bog-standard 1N5402. 3A average, 200A peak, 200V reverse. Costs
around 20c from just about any electronics supplier (mouser etc if you are
US, RS or Farnell if in Europe).

Craig


Search cross references for a Diodes for Tek 2211

magicdibool <magicdibool@...>
 

I have a problem with a Tektronix scopes 2211.
The diode CR903 of the power supply board is HS

On the diode, it's wright
ZM
IN
5402
9010

I am looking for a cross reference.
I had looking on site http://www.sphere.bc.ca/test/tekequiv.html
but I didn't found any

Can you help me ???



Thanks



Cedric

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