Date   

Re: SC501

J. Forster <jfor@...>
 

Deane E. Kidd wrote:

Hi Chris:
The SC501 was first made as a MR501 and they are monitors or scopes for monitoring signal sources internal in the TM power frames or external sources.
Deane, you are quite right, but the MR-501 has no sweep. You need to use it with a RG-501, which is really a bit silly.

[snip] Reading the sad tales of woe about tantalum capacitors one would believe that Tek did not care and used anything that the vendors had to offer. [snip]
Again, I basically agree, with the exception of those damn 'orange drop' epoxy dipped Tantalums, which are really a bane.

Take care,
-John


Re: FS: CRO Manuals

Brian A Clarke <brianclarke01@...>
 

Hi People,

I have available a couple of original CRO manuals, in good condition:

Hickok 1805A
Solartron CD 1400

Please contact me off list.
Brian.


Re: SC501

Deane E. Kidd <dektyr@...>
 

Hi Chris:
The SC501 was first made as a MR501 and they are monitors or scopes for monitoring signal sources internal in the TM power frames or external sources. As you stated, Tek did not make instruments as toys and these two monitors were not toys but full fledged scopes.
Tek also did not make instruments with cheap junk parts, but had a component evaluation groups that evaluated all of the parts used and tried to do simulated life testing to determine which parts were not-so-good and not use them. Life testing is an art in knowing what parameters are most important. Reading the sad tales of woe about tantalum capacitors one would believe that Tek did not care and used anything that the vendors had to offer. What seems to have been lost in the noise is how old some of these instruments are and they are still working very well. The 184's and 134's have been with Tek since the '50's and many are still in cal labs and are being used daily. I don't believe that they used electrolytic caps with 10% tolerence as part of the timing circuits and I suspect that other components have drifted well out of tolerence and in the eye's of the current users, the electrolytic caps need to changed because they are the things that usually fail. My 547 has never had a cap changed and my Hallicrafters SX28 receiver still has all of it's original caps. I can't say that it works like new but the caps don't seem to be the cause of it's failure to meet all mfg's specs. Like all of us humans we are getting older and find things don't work like they did when we were 35-40 which is half of my present age but I have a system which rebuilds it self on a daily basis but my electronic equipment is not able to rebuild itself but just keeps working with the guts it was made with.
Keep an open mind about the electrolytics as they may not be bad and look for other causes of failure, especially in timing circuits where 1% resistors are critical and voltage levels are important.
Deane

----- Original Message -----
From: Chris van Lint
To: TekScopes@yahoogroups.com
Sent: Friday, March 17, 2006 3:21 PM
Subject: [TekScopes] SC501


While I am in a writing mood,

I have two SC501 scopes. I never really took much notice of them, but I
recently revisited them. I was quite surprised at the sharo clear trace
they produce and how easy they trigger. Fitted in a TM501 mainframe they
make a nice little portable scope, albeit with limited bandwidth. Now I am
no expert, but I do know that Tek did not make any equipment as "toys" and
their stuff is intended for serious use. Can anybody tell me / theorize
what the intended purpose was for this particular model.

Chris



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Re: SC501

J. Forster <jfor@...>
 

In the '60s and '70s, IRIG (Inter Range Instrumentation Group) analog tape
recorders were in wide use for test data. One possible use for the SC501 was to
monitor these. VuData made a similar scope, but less capable than the 501. There
is a small fly in this theory though.. the IRIG recorders were 7 or 14 or 28
channels. (1/4, 1/2, an 1" tape) and Tek's widest mainframe was the TM-506

Another use was the making of small, custom test sets. Clearly, that's what Tek
envisioned when they included the square pin jumpers on the back of the
mainframe mother board and the custom interface connector.

Lastly, they looked really cool on the bridge of 'Battlestar Gallactia'

-John



Chris van Lint wrote:

While I am in a writing mood,

I have two SC501 scopes. I never really took much notice of them, but I
recently revisited them. I was quite surprised at the sharo clear trace
they produce and how easy they trigger. Fitted in a TM501 mainframe they
make a nice little portable scope, albeit with limited bandwidth. Now I am
no expert, but I do know that Tek did not make any equipment as "toys" and
their stuff is intended for serious use. Can anybody tell me / theorize
what the intended purpose was for this particular model.

Chris


SC501

Chris van Lint
 

While I am in a writing mood,

I have two SC501 scopes. I never really took much notice of them, but I recently revisited them. I was quite surprised at the sharo clear trace they produce and how easy they trigger. Fitted in a TM501 mainframe they make a nice little portable scope, albeit with limited bandwidth. Now I am no expert, but I do know that Tek did not make any equipment as "toys" and their stuff is intended for serious use. Can anybody tell me / theorize what the intended purpose was for this particular model.

Chris


7B90P

Chris van Lint
 

Hi there,

I have been following the threads on using the 7A16P manually with casual interest, until somewhere in the back of the grey mass with floats around between my ears I remembered that a few years ago I scored something 7000 and GPBI. When I fired it up, it lit up like a Christmas tree. The lights behind the transparent buttons are LEDS instead of the traditional incandescent lamps. Pressing the buttons would change the indications, however it would not produce a trace on the scope. After chastising myself, for not checking in the catalogue whether the thing is any use to me, I put it aside for possible use as spare parts. After having a good look at it today, this seems very unlikely, as it is jam packed with fairly sophisticated components (40 pin IC's etc.) and the transistors are soldered in. (mercifully no tantalums).

So far I have located the following plugs/jumpers:
P130
VMA (superscore)
STOP (superscore)
P1412

Can anybody tell me whether this plug-in can be used manually

Cheers,

Chris


Re: Can the 7A16P be used manually? - YES!!!, Ditto 7A29P

d.seiter@...
 

I did think of that very early on, but I was making the assumption that if the plug-in was made for a specific MF (which is what I had heard), the "activation" circuit was probably hardwired into the MF via unused interface lines.

-------------- Original message --------------
From: "Stefan Trethan" <stefan_trethan@gmx.at>

On Fri, 17 Mar 2006 21:54:44 +0100, wrote:

I don't remember seeing a P028 jumper on mine. The three jumpers were
for VME, and another reset function I don't recall.
Since mine is early, it may be a feature that was added later.

Just a thought, but if tek put buttons there, wouldn't it kind of make
sense there must be a way to enable them, regardless of revision?

ST



Yahoo! Groups Links






492, 492P Spectrum Analyser Manuals seen on E-bay UK

sixtiestek <sixtiestek@...>
 

I don't know if these are interesting or not, I've no connection with
the seller.

Op Manual: -

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?
ViewItem&item=7600917499&ssPageName=ADME:B:SS:UK:1

Service Vol.1: -

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?
ViewItem&item=7600916355&ssPageName=ADME:B:SS:UK:1

Don't quarrel
- Martin


Re: Electrolytic capacitor tolerances in type 134 current amp

J. Forster <jfor@...>
 

David C. Partridge wrote:

Mind you, try telling that to my 184 time mark generator - there's a *lot*
of electrolytic capacitors in the monostable countdown circuits whose value
has to be "just so" or everything falls apart. For example: the countdown
timing capacitor in the 5mS to 10mS stage (C283) calls for a 0.22uF 10%
electrolytic, and it means it about the tolerance.

I had to try six capacitors before I hit on one with the correct value to
actually work,
That value sounds like a 150D or CS-13 Tantalum. The glass sealed, metal cased
Ta's don't usually change much in my experience. They do very occasionally short
though. That said, I'd not design them into a value critical circuit.

Are you sure nothing else in the circuit is sick?

-John


Re: Electrolytic capacitor tolerances in type 134 current amp

David C. Partridge <david.partridge@...>
 

Mind you, try telling that to my 184 time mark generator - there's a *lot* of electrolytic capacitors in the monostable countdown circuits whose value has to be "just so" or everything falls apart. For example: the countdown timing capacitor in the 5mS to 10mS stage (C283) calls for a 0.22uF 10% electrolytic, and it means it about the tolerance.

I had to try six capacitors before I hit on one with the correct value to actually work, and a whole number of others were just as awkward (this 184 had a lot of obviously dead electrolytics and a lot were in the monostable countdown stages where the value is critical unless you are lucky and it is in a stage which has a trim-pot).

As the 134 is of "similar" vintage, I had visions that this too might tend to rely on accurate values for these.

Dave

----- Original Message -----
From: "J. Forster" <jfor@quik.com>
To: "david_c_partridge" <david.partridge@dsl.pipex.com>
Cc: <TekScopes@yahoogroups.com>
Sent: Friday, March 17, 2006 12:42 AM
Subject: Re: [TekScopes] Electrolytic capacitor tolerances in type 134 current amp


In general, electrolytics are not used in situations where the capacitance is at
all critical.


Re: Can the 7A16P be used manually? - YES!!!, Ditto 7A29P

sixtiestek <sixtiestek@...>
 

P028 is right at the back on mine, close up against the centre of the
connector.

--- In TekScopes@yahoogroups.com, "Stefan Trethan" <stefan_trethan@...>
wrote:

On Fri, 17 Mar 2006 21:54:44 +0100, <d.seiter@...> wrote:

I don't remember seeing a P028 jumper on mine. The three jumpers
were
for VME, <STOP> and another reset function I don't recall.
Since mine is early, it may be a feature that was added later.

Just a thought, but if tek put buttons there, wouldn't it kind of
make
sense there must be a way to enable them, regardless of revision?

ST


Re: Can the 7A16P be used manually? - YES!!!, Ditto 7A29P

stefan_trethan
 

On Fri, 17 Mar 2006 21:54:44 +0100, <d.seiter@comcast.net> wrote:

I don't remember seeing a P028 jumper on mine. The three jumpers were for VME, <STOP> and another reset function I don't recall.
Since mine is early, it may be a feature that was added later.

Just a thought, but if tek put buttons there, wouldn't it kind of make sense there must be a way to enable them, regardless of revision?

ST


Re: Is there any market left for the old 5xx series of scopes and accessories ?

d.seiter@...
 

I agree; Autoset reminds me of cash registers in fast food places- you don't have to know how to make change, just push the burger icon. The dumbing-down of society continues...


I hate autoset - it is often misleading. If you don't know how to adjust a
scope to get a steady trace, you shouldn't be using it! A scope is only as
good as the person using it, otherwise it is one of the most misleading
instruments in the workshop.


Re: Electrolytic capacitor tolerances in type 134 current amp

d.seiter@...
 

The big reason you don't see axials is PCB real estate, particularly in the large sizes. Another reason is the exposed lead when used in vertical mode; radials are safer for techs who don't watch what they are doing. OTOH, I hate radials because there's no place to clip on a probe.

-------------- Original message --------------
From: "David C. Partridge" <david.partridge@dsl.pipex.com>
In general I quite agree about electrolytics. That is why I was surprised
at seeing the 10% tolerance specification in the parts list for those
components. Mind you, one of the interstage coupling electrolytics (C140)
is specified at 22uF, 500V and I suspect the actual part is a 50V or less
rating (I haven't gone hunting for it to confirm).

I'm letting it soak right now in the hope that this will reform any caps
that will take it and in the process sort out the supply ripple which is a
tad high (at least the supply caps won't be that critical it they don't
settle down).

There's no 1M / 50 Ohm switch - maybe that's on the AM503?

PS YOY don't mfrs make many electrolytics in axial configuration these days?
You could use axials in either stood up (like a radial) or laid down mode,
and you just don't have that flexibility with a radial. Is it because PCB
stuffing machines can't handle axials well?

D.
----- Original Message -----
From: "J. Forster" <jfor@quik.com>
To: "david_c_partridge" <david.partridge@dsl.pipex.com>
Cc: <TekScopes@yahoogroups.com>
Sent: Friday, March 17, 2006 12:42 AM
Subject: Re: [TekScopes] Electrolytic capacitor tolerances in type 134
current amp


In general, electrolytics are not used in situations where the capacitance
is at
all critical. I would turn the thing on and just let it sit for a day or
two,
so any marginal caps will reform, before attacking it.


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Re: Can the 7A16P be used manually? - YES!!!, Ditto 7A29P

d.seiter@...
 

I don't remember seeing a P028 jumper on mine. The three jumpers were for VME, <STOP> and another reset function I don't recall. Since mine is early, it may be a feature that was added later.

-------------- Original message --------------
From: "sixtiestek" <sixtiestek@yahoo.co.uk>
You do the 7B90P in a similar way - jumper P028.

--- In TekScopes@yahoogroups.com, "Dennis Tillman" <Dennis@...> wrote:

The 7B90P is another story. I couldn't figure out how to get the
pushbuttons
to work.





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Re: Can the 7A16P be used manually? - YES!!!, Ditto 7A29P

sixtiestek <sixtiestek@...>
 

You do the 7B90P in a similar way - jumper P028.

--- In TekScopes@yahoogroups.com, "Dennis Tillman" <Dennis@...> wrote:

The 7B90P is another story. I couldn't figure out how to get the
pushbuttons
to work.


Can the 7A16P be used manually? - YES!!!, Ditto 7A29P

Dennis Tillman <Dennis@...>
 

Yes the 7A16P can be used manually by pressing the front panel pushbuttons.
It makes a perfectly acceptable plugin as well. It has one nice feature
which I don't recall seeing on any other Tek plugins - One of the buttons
lets you switch the input impedance between 1 MegOhm and 50 Ohms.

Thanks to all who replied. In particular, thanks to Julian Bunn, who knew
exactly what to do.

On the back end of the 7A16P microprocessor board (the board on the right as
you are looking at the front of the plugin), next to the rear connector that
goes to the mainframe, there are two pins standing up. The silk screen on
the PC board says this is P1622. Normally there is no jumper plug on it. To
enable the front panel buttons place a jumper on it.

It is really elusive to locate P1622 in the schematic. I haven't figured out
all of what it does yet but basically the jumper connects together the
mainframe connections A9 to A1. A9 is already connected in the plugin to
B27, likewise A1 is already connected to A8. It seems like adding this
jumper provides +5 VDC to a bunch of ICs but it is really hard to tell where
the +5V goes.

I tried my 7A29P which worked automatically via the front panel buttons
without any changes. Maybe Tek got smart by the time this plugin came out.

The 7B90P is another story. I couldn't figure out how to get the pushbuttons
to work.

Thanks again to Julian,
Dennis


Re: Is there any market left for the old 5xx series of scopes and accessories ?

stefan_trethan
 

On Fri, 17 Mar 2006 19:58:47 +0100, Jim Beacon <jim@g1jbg.co.uk> wrote:


I hate autoset - it is often misleading. If you don't know how to adjust a

scope to get a steady trace, you shouldn't be using it! A scope is only as

good as the person using it, otherwise it is one of the most misleading

instruments in the workshop.

I agree, it _IS_ confusing. If i press autoset i need afterwards to check what settings were selected and that takes longer than making the right settings myself. And usually the display is not really how i would have liked it best.

I recall an event involving a newer TEK scope (TDS220 i think) and a parallel port signal, requiring several engineers to resolve. There was some confusion as to why the PC parallel port seemed to output -5V pulses ;-).
I don't need to tell you guys why this was apparently happening, but autoset might have been involved (i'm not sure of that).
It is nice to have mechanical controls that you can look at and manipulate. i understand why the newer scopes all require menus and stuff to fit in all the functions, but it isn't easier to operate.

ST


Re: TM 5000 GPIB edge connectors

Dennis Tillman <Dennis@...>
 

Hi Bill,
I have several extenders for the TM500. They work for the TM5000 as well.
What are really impossible to find are the extenders for the GPIB interface
to the TM5000 mainframes and plugins. Tegam, which bought the rights to the
line from Tek, refuses to make them at any price.

By any chance do you know who makes the connectors for the GPIB part of the
TM5000 series?

If you can find them I will buy a bunch, and send you one at no charge, and
offer the rest, at cost, to the group. I think it would be something that
several of the people in the group would like to have.

Dennis

-----Original Message-----
From: TekScopes@yahoogroups.com [mailto:TekScopes@yahoogroups.com] On Behalf
Of Bill Roberts
Sent: Friday, March 17, 2006 7:40 AM
To: TekScopes@yahoogroups.com
Subject: [TekScopes] TM Power Module edge connectors

The manufacturer of the TM Power Module card edge connectors, EDAC, is
alive and well.

The part number for the connectors in the TM frames IS:

303-056-520-301 according to the TEK manual.

Here is the web site: http://www.edac.net/product.html?ProductID=83

EVERYTHING you want to know is listed there, except availability and
price.

If you want to build an extension cable for TM series plugins, this is
what you need. That is unless you want to hack up a TM 501, TM504, or
TM506 for parts.

The specs should give you enough info to find another manufacturer's
product if you can't find EDAC's.

Best

Bill


Re: 222 on stock batteries was lithium battery

J. Forster <jfor@...>
 

OK. I'll get it for you later tonight.
-John

DaveC wrote:

OK, that would work.

Thanks,
Dave

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