Date   
Re: Still looking for a cover for a 485 scope...

Dave Daniel
 

It took me something like seven years to find a cover for my 485. When I found a cover on ebay that looked like it might be the correct size, I asked the seller to measure the cover and decided to buy it based on those measurements. It turned out to be the correct cover for my 485.

As someone else noted, Tektronix did not mold a part number into the cover. There are absolutely no identifying marks on the cover except for the style of latches on the sides.

I forget whether or not the manual calls out a part number for the cover.

DaveD

Sent from a small flat thingy

On Jan 9, 2020, at 10:51, M M <wa6ilq@...> wrote:

Thank you for the part number correction. At the moment
there are no covers for a 485 on eBay - and haven't been
for as long as I've been looking.

A 3D printed cover would be quite acceptable. I just don't
have the knowledge to craft one, or access to a 3D printer.

Believe it or not, I still cart the 485 around occasionally
on the occasional field service job where the storage feature
is needed... maybe once or twice a year.
I have a lighter weight scope for the other field service
needs... maybe once a month or every other month.

Mike WA6ILQ

On 01/09/2020 07:03 AM, Kevin Oconnor wrote:
The cover for my 485 is 40 years old. Seldom in its proper place,
often used as a parts tray, generally crammed into the soft manual
& probe bag attached to the top. It is a wonder it is still around.
I think it is the bag. I still have the OEM service manual and 4
original probes in there with the cover!
I looked at the cover and it has no identification. I would have
expected a part number or a mold number at least. A crafty person
could 3D print this as it is only complicated at the 2 edge clips.
I assume you want the nostalgia factor of the OEM part though.

Kevin KO3Y
On 01/08/2020 08:36 PM, Craig Cramb wrote:
Front Cover for my 485 scope

From my research I found the part # 200-1251-00 in the 485 manual.
This might be the correct part number you are seeking.

Craig
On 01/08/2020 08:20 PM, mr.fabe wrote:
The part number 200-5052-00 listed is for a MSO3000 series scope.
There are a few of those for sale on ePray.
On 01/07/2020 10:04 AM, M M wrote:> The subject line says it all...
One of my New Years resolutions is to get my workbench in proper
shape...

I'm still looking for a part number 200-5052-00
Front Cover for my 485 scope (also looking for a cover for an
IFR 500, and a Simpson 260 rolltop case, but that's on different
mailing lists).

Thanks in advance for any pointers...

Mike Morris WA6ILQ
626-379-8045 9a-9p Pacific Time (GMT-7)

Re: 'Solder Rot'

greenboxmaven
 

That is what I thought it would do. The "generator" is a seperator. The common ones used for medical and welding seperate the oxygen and release the nitrogen back to the atmosphere. In this case, the same equipment could be used, but the nitrogen would be collected and used and the oxygen released back to the atmosphere.

Bruce Gentry, KA2IVY

On 1/9/20 10:23 AM, Eric wrote:
It uses an air compressor that passes through a N2 generator that is
supposed to get it to 99.99% and it is all really low pressure. The whole
system runs at 3 to 5 psi

On Thu, Jan 9, 2020, 9:58 AM Ken Eckert <eckertkp@...> wrote:

It has to be an inert gas, you are trying to keep the joint/work zone in a
oxygen free environment

On Thursday, January 9, 2020, greenboxmaven via Groups.Io <ka2ivy=
verizon.net@groups.io> wrote:

An interesting idea. Does it use a cylinder of compressed nitrogen or the
exhaust of an oxygen concentrator? I can imagine the AudioPhools right
now,
arguing over where and when the nitrogen came from, or if argon or xenon
would make the joint sound better.

Bruce Gentry, KA2IVY


On 1/8/20 11:06 PM, Ken Eckert wrote:

Same idea as making a thermocouple, except you use argon

On Wednesday, January 8, 2020, Eric <ericsp@...> wrote:

Speaking of solder joints what do you guys think about Hakko's Hot N2
gas
shielded soldering irons? The idea is to use a 99.99% pure Hot n2 gas
flush
of the area to prevent oxidation inside the solder joint. I guess the
idea
is MIG welding for soldering?

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Need quarter panel for 603 XY

toby@...
 

Hi,

I received a 603 that's missing one of the quarter cabinet panels. I
know this is a long shot, but does anyone on the list have a cabinet or
part of? It's likely compatible with other models in the 6xx family,
from what I see (e.g. 606 also has the split panels).

Can supply photos if needed.

--Toby

Re: Still looking for a cover for a 485 scope...

M M
 

Thank you for the part number correction. At the moment
there are no covers for a 485 on eBay - and haven't been
for as long as I've been looking.

A 3D printed cover would be quite acceptable. I just don't
have the knowledge to craft one, or access to a 3D printer.

Believe it or not, I still cart the 485 around occasionally
on the occasional field service job where the storage feature
is needed... maybe once or twice a year.
I have a lighter weight scope for the other field service
needs... maybe once a month or every other month.

Mike WA6ILQ

On 01/09/2020 07:03 AM, Kevin Oconnor wrote:
> The cover for my 485 is 40 years old. Seldom in its proper place,
> often used as a parts tray, generally crammed into the soft manual
> & probe bag attached to the top. It is a wonder it is still around.
> I think it is the bag. I still have the OEM service manual and 4
> original probes in there with the cover!
> I looked at the cover and it has no identification. I would have
> expected a part number or a mold number at least. A crafty person
> could 3D print this as it is only complicated at the 2 edge clips.
> I assume you want the nostalgia factor of the OEM part though.
>
> Kevin KO3Y

On 01/08/2020 08:36 PM, Craig Cramb wrote:
> Front Cover for my 485 scope
>
> From my research I found the part # 200-1251-00 in the 485 manual.
> This might be the correct part number you are seeking.
>
> Craig

On 01/08/2020 08:20 PM, mr.fabe wrote:
> The part number 200-5052-00 listed is for a MSO3000 series scope.
> There are a few of those for sale on ePray.
>

On 01/07/2020 10:04 AM, M M wrote:> The subject line says it all...
> One of my New Years resolutions is to get my workbench in proper
> shape...
>
> I'm still looking for a part number 200-5052-00
> Front Cover for my 485 scope (also looking for a cover for an
> IFR 500, and a Simpson 260 rolltop case, but that's on different
> mailing lists).
>
> Thanks in advance for any pointers...
>
> Mike Morris WA6ILQ
> 626-379-8045 9a-9p Pacific Time (GMT-7)

Re: 'Solder Rot'

Eric
 

It uses an air compressor that passes through a N2 generator that is
supposed to get it to 99.99% and it is all really low pressure. The whole
system runs at 3 to 5 psi

On Thu, Jan 9, 2020, 9:58 AM Ken Eckert <eckertkp@...> wrote:

It has to be an inert gas, you are trying to keep the joint/work zone in a
oxygen free environment

On Thursday, January 9, 2020, greenboxmaven via Groups.Io <ka2ivy=
verizon.net@groups.io> wrote:

An interesting idea. Does it use a cylinder of compressed nitrogen or the
exhaust of an oxygen concentrator? I can imagine the AudioPhools right
now,
arguing over where and when the nitrogen came from, or if argon or xenon
would make the joint sound better.

Bruce Gentry, KA2IVY


On 1/8/20 11:06 PM, Ken Eckert wrote:

Same idea as making a thermocouple, except you use argon

On Wednesday, January 8, 2020, Eric <ericsp@...> wrote:

Speaking of solder joints what do you guys think about Hakko's Hot N2
gas
shielded soldering irons? The idea is to use a 99.99% pure Hot n2 gas
flush
of the area to prevent oxidation inside the solder joint. I guess the
idea
is MIG welding for soldering?

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Re: 2465B Buying advice

Jim Ford
 

Do know that the 2465B knobs have a noticeable lag in response, due to their being rotary encoders sampled by the microprocessor.  That used to drive me nuts several decades ago when I had one on my bench in the lab.  I assume the other 2465 and 2467 scopes have the same issue.Jim Ford Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------From: Harold Foster <@HalFoster> Date: 1/9/20 5:03 AM (GMT-08:00) To: TekScopes@groups.io Subject: [TekScopes] 2465B Buying advice All:I'm looking for a very good, fast analog scope and so far the 2465B seems to be the best choice; I would very much welcome any tips and advice before I go shopping.  Options that are worth holding out for?  Certain manufacturing dates/serial numbers? Fair prices?  Different models?TIA,Hal

Re: GPIB videos wanted?

Doug
 

I recently bought a NI GBIB USB interface of the Asian persuasion. I've got it to recognize my TDS754C. I would like to save the NVRAM contents and maybe tweek the calibration.
At this point a tutorial would help, I don't know where to start. Thanks for the offer.

Re: Still looking for a cover for a 485 scope...

Kevin Oconnor
 

The cover for my 485 is 40 years old. Seldom in its proper place, often used as a parts tray, generally crammed into the soft manual & probe bag attached to the top. It is a wonder it is still around. I think it is the bag. I still have the OEM service manual and 4 original probes in there with the cover!
I looked at the cover and it has no identification. I would have expected a part number or a mold number at least. A crafty person could 3D print this as it is only complicated at the 2 edge clips.
I assume you want the nostalgia factor of the OEM part though.

Kevin KO3Y

Re: 'Solder Rot'

Ken Eckert
 

It has to be an inert gas, you are trying to keep the joint/work zone in a
oxygen free environment

On Thursday, January 9, 2020, greenboxmaven via Groups.Io <ka2ivy=
verizon.net@groups.io> wrote:

An interesting idea. Does it use a cylinder of compressed nitrogen or the
exhaust of an oxygen concentrator? I can imagine the AudioPhools right now,
arguing over where and when the nitrogen came from, or if argon or xenon
would make the joint sound better.

Bruce Gentry, KA2IVY


On 1/8/20 11:06 PM, Ken Eckert wrote:

Same idea as making a thermocouple, except you use argon

On Wednesday, January 8, 2020, Eric <ericsp@...> wrote:

Speaking of solder joints what do you guys think about Hakko's Hot N2 gas
shielded soldering irons? The idea is to use a 99.99% pure Hot n2 gas
flush
of the area to prevent oxidation inside the solder joint. I guess the
idea
is MIG welding for soldering?

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Re: 'Solder Rot'

greenboxmaven
 

An interesting idea. Does it use a cylinder of compressed nitrogen or the exhaust of an oxygen concentrator? I can imagine the AudioPhools right now, arguing over where and when the nitrogen came from, or if argon or xenon would make the joint sound better.

Bruce Gentry, KA2IVY

On 1/8/20 11:06 PM, Ken Eckert wrote:
Same idea as making a thermocouple, except you use argon

On Wednesday, January 8, 2020, Eric <ericsp@...> wrote:

Speaking of solder joints what do you guys think about Hakko's Hot N2 gas
shielded soldering irons? The idea is to use a 99.99% pure Hot n2 gas flush
of the area to prevent oxidation inside the solder joint. I guess the idea
is MIG welding for soldering?

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Re: 2465B Buying advice

Jean-Paul
 

Hello Harold: Welcome to the 2465/7B fan club!

I have 5 of these (!) and the costs varied $200-$400. These were the last TEK CRT scopes and have the finest ease of operation, performance and repair ability!
Look for physical damage or abuse on front, and rear, as well as the initial behavior on startup, of the self test.
Options are CT, BCT, and probe power, and GPIB. Suggest the original TEK probes: P6137, also use the Zo probes P6156 (rare).

The 2467B has wider BW 400 MHz and a micro channel plate CRT, but has a beam time limiter and somewhat smaller screen. Its super for fast transients and very fast sweep rates and for scope photography.

The serial numbers SN >B050xxxx are best, the earlier SN are different revs and can be troublesome.
The late versions have a problem: 4 pcs SMD lytic cap leakage that corrodes the A5 control board, producing many odd behaviors, but this is usually easy to fix.

As all of these are now circa 30 -35 yrs old, recapping the PSU and replacing the battery backup NVRAM (Dallas 1227) is expected. Then a full caliobration!
Get the big service manual that applies to the model and serial you get.

I am sure that Chuck Harris and our TEK Guru Dennis Tillman W7PF will have many more useful tips!

Just the ramblings of an old retired EE!

GOOD LUCK!

Jon in Paris

Re: Damaged TCP202 Current Probes

Jean-Paul
 

Hello: I have many of the earlier current probes, both passive and active, P6021, P6022, P6302. I believe your TCP202 is similar to the old P6302.

In general the precision ferrite cores are very fragile (thin ceramic) and easily damaged by a small drop or maltreatment when closing the jaws.
This results in a hairline fracture or chip. The result is very often unfix-able offset or intermittent offset or output.

As the core is assembled onto the jaw with potting compound, the only good solution is to get a new probe.

90% of the issues are due to the core. The hall effect sensor and the amplifier. can also be damaged by high voltage transients, but this is rare.

Look for indication of chips or cracks in the polished jaw surfaces, dirt on the mating surfaces and damage to the plastic housing.

In many years, I have fixed exactly ONE, that had an intermittent cable!

GOOD LUCK!

Jon

2465B Buying advice

Harold Foster
 

All:

I'm looking for a very good, fast analog scope and so far the 2465B seems to be the best choice; I would very much welcome any tips and advice before I go shopping. Options that are worth holding out for? Certain manufacturing dates/serial numbers? Fair prices? Different models?

TIA,

Hal

Re: 454 HV regulation off

Albert Otten
 

Hi Roger,

When the HV is working (almost) normally a Z-axis fault can never increase the positive voltage at TP1349 far enough to make the grid voltage over 150 V positive w.r.t. cathode. (150-180 V measured by Jack.)

Albert

On Thu, Jan 9, 2020 at 12:33 PM, Roger Evans wrote:


---
The cathode voltage is only off by about 7% and as Albert says the grid
voltage will be off by a similar percentage so it shouldn't account for your
symptoms. I have had to replace transistors in the Z axis amplifier of both
my 454s and I would strongly suspect that the real culprit lies therein.

Re: 454 HV regulation off

Roger Evans
 

The manual shows the voltage that should be present at the input to the HV regulator (R1414 - R1402, marked L on the board connector) as -11.6V. If this measures OK then the regulator is probably working as it should and the error is in the divider chain. You would need to check R1404, less likely R1403 and C1403, as well as the 3M resistors.

The cathode voltage is only off by about 7% and as Albert says the grid voltage will be off by a similar percentage so it shouldn't account for your symptoms. I have had to replace transistors in the Z axis amplifier of both my 454s and I would strongly suspect that the real culprit lies therein.

Regards,

Roger

Re: Tek 576 Curve Tracer USB port to a cpu ... ?

Ke-Fong Lin
 

Hi Dennis,

What you are actually going into, is pretty much a digitizing scope.
In fact, I've always wonder why there's not an "open-source" project to design a USB digitizing end to re-use the 5000 or 7000 series plugins with a computer instead of mainframe.
What you are describing is general enough that, with the appropriate PSUs, this would allow us to do just that (a 5CT1N with the output on a laptop for instance).

Best regards,

Digitizing the deflection voltages is a great idea because of its simplicity.
It would be easy to capture the deflection voltage for both axes with A/D
converters and convert it into X-Y data. A few issues that may make it a bit
more difficult:

Re: 454 HV regulation off

Albert Otten
 

Hi Jack,

It seems that you didn't read my message https://groups.io/g/TekScopes/message/162916 .

When the HV is "motorboating" strange effects can happen. But as long as the cathode HV is off spec because of a regulator fault but more or less stable, it won't cause your too bright trace. The grid HV will be off by about the same amount.

Albert

On Thu, Jan 9, 2020 at 01:51 AM, Jack Ohme wrote:


I created a thread a few days ago about my 454, and believe I have isolated
the issue, in its -1960v supply. The HV reg is totally off, which is
causing my grid voltage to be far too high, and as an effect, my screen
brightness as well. The LV regulation is spot-on, and cranking the HV
regulation control pot, R1401, mentioned on page 6-11 of the manual, to the
max and then dropping it to the minimum causes my screen and trace to drop
to an acceptably low level for a moment before returning to far too bright.
Any idea as to what could be causing this? Something in the actual HV
section, or something in the LV reg that controls the HV? Oh and to put a
number on my -1960v test point, its hovering around -1830 currently.

Re: Tektronix 532 LV rail shorted

Rajesh VS
 

You can keep the R110 disconnected until the problem is resolved.
was V606 and V605 in place when the cap cooked ? If it was in place, may be
remove them, power up and see if the cap is cooking, check the voltage
across the cap, both AC and DC volts.
while the rectifier tubes is out, check filament voltage (AC) between pin
2-8 of V606. I hope the tubes are tested, and good, may be to confirm you
can try a pair from another rail.
reinstall V606 and V605 and check the DC voltage across the cap to see
if its matching the polarity of the capacitor ( +ve of the cap to ground
and -ve to -150V rail)

On Wed, Jan 8, 2020 at 6:05 PM <randolphbeebe@...> wrote:

Tonight I removed all the rectifier tubes including the 6080 series
regulator tube. Then I lifted a lead on R110. When the scope was powered
up there was still an excessive current draw and C640 (the new, replaced
one) started to cook and get very hot including a little bit of a smoke
show. This was through the dim bulb tester and a variac with a maximum
voltage of 39V AC. I also checked my work and no capacitors were installed
incorrectly.

Then I lifted the lead from Tap 17 and for the first time the fan started
to turn but when I reconnected R110 that still heated up right away when I
re-installed the rectifier tubes.

One interested observation; The voltage from tap 16 is 70-90V AC but no DC
volts... that does not seem correct?



--
/Rajesh

Re: Tek 576 Curve Tracer USB port to a cpu ... ?

Harvey White
 

relays, coils, optical isolators...

Harvey

On 1/7/2020 2:26 PM, Miguel Work wrote:
I was studying the schemes, the gain of the amplifiers is switched with relays on the same deflector plates. The same voltage of the deflector plates should be read with a differential amplifier.

Sometimes I used an digital oscilloscope to read directly voltage plates on xy


-----Mensaje original-----
De: TekScopes@groups.io [mailto:TekScopes@groups.io] En nombre de Harvey White
Enviado el: martes, 7 de enero de 2020 19:36
Para: TekScopes@groups.io
Asunto: Re: [TekScopes] Tek 576 Curve Tracer USB port to a cpu ... ?

I'd be looking into the curve tracer to find a point where the inputs are all standardized.  The low speed of the trace is very helpful, you'd need a synch pulse (start of trace) and then want to digitize (AVR or a separate chip, suggest two chips, one for vert, one for horizontal).

Delay in the processor or in hardware, digitize the trace (processor captures), then you take the data, feed it to a computer (RS-232 interface to USB), then display that on the computer screen.

You could do a sequential a/d, have to synchronize it with start of sweep, and then go from there.

If you have a way of digitizing the position of the scale/sensitivity adjustments, you can correct trace to real data.

Harvey


On 1/6/2020 8:38 PM, Eric wrote:
Arduino has potential Pi is too much like a computer... well is a
computer. I have had this rolling around in my head for a while as to
how to do this, I was even thinking of omitting all the HV stuff
tapping off the CRT driver pins digitizing the inputs and driving a
VGA port with them. Some challenges I have come across already.
computer monitors are raster driven. Not X-Y driven so we would need
to time the raster. Not TOO huge a deal with a curve tracer but a
scope the sweeps are WAY to fast for a computer monitor. Color not
really an issue due to the curve tracers being monochrome. You can
just set some values and make it a color. The 576 has a sweep rate of
60Hz so it would lend its self to a conversion however the BIG one is
how to get the grid lines on the image. These would have to be driven
digitally given they are etched in to the glass. So not sure how to do
that part yet but I think an Arduino has 1024 value ADC full scale.
Then of course can we get it through a calibration process to aline
everything. We would need about 60FPS at a res of 1024x768 monochrome
with and adjustable persistence as a possible feature upgrade to aid
in the matching of transistors. By REALLY being able to over lay the
traces. But I really like the idea of a 576 with a 19 inch screen.

On 1/6/2020 6:40 PM, Mlynch001 wrote:
Seems like they are getting a premium for their interface.  But they
are also the only game in town.  If you want to play, I suppose one
should prepare to pay dearly?  I wish some of the brilliant minds in
the group would come up with something reasonable.  Arduino or
Raspberry Pi seem to have potential, I am not at all familiar with
either.




Re: Still looking for a cover for a 485 scope...

Craig Cramb
 

Front Cover for my 485 scope

From my research I found the part # 200-1251-00 in the 485 manual. This might be the correct part number you are seeking.

Craig