开云体育

My DSA602 has a reference SAW 500 Mhz oscillator with a 5e5 stability.

Does it make sense to replace this built in reference by a much better one
?

I have a 500 Mhz 1e11 ( tau 1000 sec ) reference.
Sure, this is absurd overkill, but would this one yet improve the 602's
timebase jitter of >20 ps ?

What else better measuring results ( if any at all ) could be expected by
replacing the reference oscillator ?

I have a few more questions on the DSA602.
In particular on the enhanced accury.

Some more DSA602 users on this list ?

Thanks.
Peter PE1ECM

Hi folks

I recently bought a 7904, cleaned it up and calibrated it and it is a source
of joy. One problem is that it is Option 1, which deletes the readout board
(there is a so-called dummy board in its place).

Question: Does anyone have a parts 7904 from which I could (for some cash!)
get a readout board?

Cheers

Craig

Hello Folks:

Does anybody have any general information on this model; dates of manufacture,
common problems, unobtanium parts etc?

TIA John Foster.

Hi, I'm new to the group. A friend of mine recommended this site to
get in contact with those who might be interested in old Tek scopes.
Well I have a Tektronix 536 with Type T timebase and Type CA dual
channel plugins for sale. The condition of this scope is fair. The
CRT is very bright (blindingly) and it appears to be in good cosmetic
condition inside and out considering its age. It powers up and both
channels display a waveform. The main problem with it is that it
doesn't trigger properly and therefore doesn't "lock on" to the
waveform. Maybe I have a switch in the wrong setting or maybe
something went south, but I just don't want to fiddle with it
any more. I do have a wire connected from the vertical trigger output
to the external trigger input. It used to work in this mode, but
haven't had luck recently. A couple of the red calibration knobs are
freewheeling. The scope will also come with a Model B Scope-Mobile
cart with a shallow drawer. I don't know how much this piece is
worth, but I owned it since 1986 when I was in college and have
rarely used it since. No probes or manual included. It does have a
plastic camera mount bezel. I would be happy to send some low
resolution pics to those who are interested. I live near Lancaster,
PA and certainly anyone within driving distance to pick it up would
be an advantage. Can anyone advise me on how much this package is
worth and/or give me an offer? I will consider any reasonable offer.
I recently picked up a newer, much smaller scope for my hobby needs
and the big, old one has to go...I will miss it. Thanks.

Dean

P.S. - I also have a large box of vacuum tubes for sale, mostly taken
from old TV's and radios. Just not enough space to keep them!

Hi, I'm new to the group. A friend of mine recommended this site to
get in contact with those who might be interested in old Tek scopes.
Well I have a Tektronix 536 with Type T timebase and Type CA dual
channel plugins for sale. The condition of this scope is fair. The
CRT is very bright (blindingly) and it appears to be in good cosmetic
condition inside and out considering its age. It powers up and both
channels display a waveform. The main problem with it is that it
doesn't trigger properly and therefore doesn't "lock on" to the
waveform. Maybe I have a switch in the wrong setting or maybe
something went south, but I just don't want to fiddle with it
any more. I do have a wire connected from the vertical trigger output
to the external trigger input. It used to work in this mode, but
haven't had luck recently. A couple of the red calibration knobs are
freewheeling. The scope will also come with a Model B Scope-Mobile
cart with a shallow drawer. I don't know how much this piece is
worth, but I owned it since 1986 when I was in college and have
rarely used it since. No probes or manual included. It does have a
plastic camera mount bezel. I would be happy to send some low
resolution pics to those who are interested. I live near Lancaster,
PA and certainly anyone within driving distance to pick it up would
be an advantage. Can anyone advise me on how much this package is
worth and/or give me an offer? I will consider any reasonable offer.
I recently picked up a newer, much smaller scope for my hobby needs
and the big, old one has to go...I will miss it. Thanks.

Dean

P.S. - I also have a large box of vacuum tubes for sale, mostly taken
from old TV's and radios. Just not enough space to keep them!

Does anyone have scanned manuals or schematics for S-51 (Count Down Trigger
Synchronizer Head) and S-53 (Trigger Recognizer Head) that could be e
mailed?

Thank you,

Miroslav Pokorni

--- In TekScopes@..., "Heather" <smithd.mn@c...> wrote:

Hello all - I'm trying to bring a 7704A back into service after
several years of downtime. Everything seems to be working with

the

exception of the vertical non-linearity I'm seeing. For example -

if

I input a signal and set up for 1 division of deflection near the

top

of the screen and move the position knob on the vertical amp

(7A26)

to move the trace to the bottom of the screen the deflection is
reduced to about .25 divisions. I get the same results from a

couple

of known good 7A26 amps. I monitored the inputs to the vertical
amplifier and noted the DC shift and reduced amplitude waveform so
I'm thinking it's probably the vertical interface board. Any

insight

would be appreciated. - Dean Smith

This sound's as a defective vertical channel switch....
The same symptoms you would see on a 2445..2465 with a bad channel
switch.

I had a look at the 7704 model, and there the channel switch is made
out of ordinary components. I don't know if this is the case in the
7704A. If so, check for 1% resistors which have drifted, or try to
wiggle with the transistors on that board (vertical interconnect)

- Fred de Vries

Hello all - I'm trying to bring a 7704A back into service after
several years of downtime. Everything seems to be working with the
exception of the vertical non-linearity I'm seeing. For example - if
I input a signal and set up for 1 division of deflection near the top
of the screen and move the position knob on the vertical amp (7A26)
to move the trace to the bottom of the screen the deflection is
reduced to about .25 divisions. I get the same results from a couple
of known good 7A26 amps. I monitored the inputs to the vertical
amplifier and noted the DC shift and reduced amplitude waveform so
I'm thinking it's probably the vertical interface board. Any insight
would be appreciated. - Dean Smith

--- In TekScopes@..., "Miroslav Pokorni" <mpokorni2000@y...> wrote:

Hello everyone,

Does anyone have an experience with spot welding tabs on a subC size NiCd
batteries? I have a stack of ten batteries which were connected with nickel
plated iron (?) tabs, welded at four spots at each end of tab, but a tab
came loose on one cell.

I was thinking of using large cap (10,000 mictoF or so), charged to 50 V or
so, a suitable switch (perhaps mercury displacement) and short, thick and
solid wires as electrodes. I need to make only four welds, so 'electrodes'
can be consumable.

I do not intend to break any new grounds, looking for someone's prior
experience.

Thank you in advance,

Miroslav Pokorni

There's currently a thread in sci.electronics.design on the subject.
I posted some links to my spot welding experiments and some
commercial data.
mike

I need to know which pot needs to be adjusted or a pointer to where
to find the info.

Everything is fine with the scope, except that the vertical gain
calibration is off quite a bit. Both channels have the same gain.I
have tried but could not find a service manual.

Thanks a lot!
nav0239

From Zenith's data sheet, the tunnel diode is a 152-0099-00, which is a
50mA/6pF device. Calculated switching time for this would be faster than
60ps - but it all depends on the layout. Any additional stray capacitance
would slow the time down. It says in the data sheet that it is on a
"circuit board assembly" which could add several pF and a few nH - hence the
specified <200ps rather than anything faster.

It is really neat though - compact and small.

The much larger 067-0513-00 has a diode in a tiny disc-like package (100mA,
6pF - so <30ps), incorporated into a GR air-line - a bit like the way it is
done in the 284. The aim is to make it think it is in a matched
transmission line. It goes like stink with a <30ps fall time (so no
performance degradation from layout) and is battery powered. There is one
on eBay at the moment.

Craig

Hello Miro

Best deal is to use an activated flux (acid) you need so little flux on the tip of the solder that you can't even see it. Just tin the nickel plate or stainless of the cell and finish the job with the usual 63/37. The stainless conducts so poorly that it takes practically no heat (in calories) to get the job done. The admonishment not to solder to nicads must have been started by a guy who tried to do it with a 500 watt iron and rosin core solder, will never happen that way. Acid core solder doesn't work very well by the way but the flux that tastes like lemon juice (we use it on our SMT line) works great.

Eric

Do not forget lubricant, it is amazing what a little bit of grease can do
for sliding. I am not sure what would be the best or recommended grease for
those switches, but I would try (thick) silicon grease, I do not think that
you can go very wrong with that choice. Spray silicone would not give you a
durable solution and there is a chance that vehicle in spray (solvent) can
attack plastic.

Regards

Miroslav Pokorni

--- In TekScopes@..., "zenith5106" <hahi@t...> wrote:

--- In TekScopes@..., "Cliff Carrie" <cliffcarrie@h...>
wrote:

I picked up a Tek 017-086 TD pulser a while back.
Does anyone have a manual or data sheet for this pulser? I'm

curious about

flatness and aberrations. What product family was it intended

for?

It's

faster than most of the pulsers I've seen, except for my Tek 284,

and much

more convenient.

Regards,
Cliff

---------
I have browsed through the cataloges from the time (1965 - 1968)

and

have not found it mentioned anywhere. I do have a datasheet but
unfortunately it's only schematic and parts list and no specs. It's
available at .
/Zenith

The link should be (no dot at the
end).
/Zenith

--- In TekScopes@..., "Cliff Carrie" <cliffcarrie@h...>
wrote:

I picked up a Tek 017-086 TD pulser a while back.
Does anyone have a manual or data sheet for this pulser? I'm

curious about

flatness and aberrations. What product family was it intended for?

It's

faster than most of the pulsers I've seen, except for my Tek 284,

and much

more convenient.

Regards,
Cliff

---------
I have browsed through the cataloges from the time (1965 - 1968) and
have not found it mentioned anywhere. I do have a datasheet but
unfortunately it's only schematic and parts list and no specs. It's
available at .
/Zenith

Hello everyone,

Does anyone have an experience with spot welding tabs on a subC size NiCd
batteries? I have a stack of ten batteries which were connected with nickel
plated iron (?) tabs, welded at four spots at each end of tab, but a tab
came loose on one cell.

I was thinking of using large cap (10,000 mictoF or so), charged to 50 V or
so, a suitable switch (perhaps mercury displacement) and short, thick and
solid wires as electrodes. I need to make only four welds, so 'electrodes'
can be consumable.

I do not intend to break any new grounds, looking for someone's prior
experience.

Thank you in advance,

Miroslav Pokorni

Did you notice also all of the duplicate so called positive entries?

Do comments from Victorias_Big_Secrets count? He has got more from her than
anyone else. Most of his feedback is for buying on e bay, rather than
selling.

Regards

Miroslav Pokorni

"(Shown with optional external display.)" Shown where??
-----Original Message-----
From: xaos [mailto:xaos@...]
Sent: Tuesday, March 16, 2004 10:04 AM
To: TekScopes@...
Subject: [TekScopes] This guy must be kidding!


The guy selling this item (TEK TLA612-2P):

has to be either the most incompetent seller or the biggest fraud.
And he has a feedback profile of 75% on 10 items. You must be kidding!

He is also an idiot if expects anyone to bid on this.

-George N2FGX



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Service.

067-0529-00 Calibration Fixture, 1000:1 divider w/switch, BNC(M)clamp
fitting and BNC(F) on ends.

The application for this fixture, that I know of, is gain setting for
differential plug-in 7A22.

Regards

Miroslav Pokorni

I picked up a Tek 017-086 TD pulser a while back. It is self contained and about twice the size of its GR connector. Power is from 2 internal coin cells. Risetime printed on it is <.2ns (200ps). It turns on automatically when a 50 ohm termination is present. I put it together with a GR to BNCm 50 ohm feedthru termination. Plugs directly into a scope input. Of course it can be put on a probe end with suitable adapters.

No muss, no fuss, no 100 volt input pulses needed.

Does anyone have a manual or data sheet for this pulser? I'm curious about flatness and aberrations. What product family was it intended for? It's faster than most of the pulsers I've seen, except for my Tek 284, and much more convenient.

Regards,
Cliff

_________________________________________________________________

Hello Ed,

Here is what I have on TU-5, a data sheet that I got on this list. I have a
hulk of a TU-5 and it does have BNC connectors; perhaps in earlier version
this unit had UHF connectors.

Be careful when connecting the unit to the signal source. What looked
intuitive connector polarity to me, is actually wrong and I connected 10 V
pulses directly to tunnel diode, so now I have a hulk of a TU-5.

Regards

Miroslav Pokorni