Date   

Re: Baking scopes?

Mattias Rickardsson
 

robin.birch@... said:

That "airing cupboard" doesn't use heated air, does it?
It is the cupboard that holds the domestic hot water cylinder. It is
commonly used for storing towels, blankets and so on in a warm environment
so that they don't get damp. it is usually quite warm, not baking, and
fairly dry
Aaaah, British luxury... what a pity that our swedish houses have proper
piping placed inside the walls... ;-)

On the other hand, we also have proper heating and a dryer climate, so
maybe the moisture after some weeks in my apartment isn't so serious after
all.

Maybe a hair blower with hot air would make some wonders?
Yes, but I think that the longer the better, hence leaving the kit
somewhere warm and dry.
Very true. I'll have to find some cosy place for my Tek pile.


/mr


Re: Baking scopes

scoper796 <scoper796@...>
 

Yesterday I baked a 3A6 and a 2B67 after hosing them out pretty good.
I used a new (to me) degreaser called "Mean Green" from Walmart which
I thought did an excellent job. It didn't seem to have as unpleasant
an odor from the residue when the units were in the oven. I do them 6
hours at about 160 degrees.

As far as why, I guess it's just because the alternative would
involve a lot of disassembly, which would be very time consuming. I
also find that a lot of damage can be caused by disassembly and
reassembly. I think if one is reasonably careful with the compressed
air and the water pressure, it is fairly safe. On these plug-ins,
there are a lot of places you can't blow the water out of, such as
the vertical attenuators. This is where the baking really helps.

Maybe I could throw a chicken in there with them and conserve energy.
It was a 28 degree day here, so the heat from the oven wasn't welcome.

Larry Christopher





--- In TekScopes@..., "Jim Beacon" <jim@g...> wrote:
Mattias,

an airing cupboard is normally the cupboard (closet) which huses
the hot water tank for the house. Normally, linen and clothes are
placed there after drying outside, to drive off any remaining
dampness (the linen also helps insulate the tank, and reduce energy
wastage).

I work in the air traffic control industry, and the two yearly
maintenance on our old airport radars used to involve taking the
cabinets and electronics outside, and washing them with a hosepipe
and de-greaser, to remove the build up of jet fuel and soot. If you
didn't do this, the EHT insulation would breakdown. The equipment was
then left out in the sun to dry for a couple of days, before being re-
assembled. I should mention that this was in the days of all valve
radar, and that the equipment was "tropicalised" - all the components
were designed to resist moisture and fungus.

Jim.
Please see our website the " Vintage Communication Pages" at
WWW.G1JBG.CO.UK



Re: Baking scopes?

eboytoronto
 

Hi,

As ex-patriot I can explain "airing cupboard".

The airing cupboard normally houses the hot water tank (electric). Originally the tank was not thermally insulated all that well so this created a warm cupboard.

The cupboard was generally used to store laundry, especially towels so that would be nice and warm.

( put this in the context of country where it rains every other day and the humidy is high, damp !!)


Regards,


John Barnes

---------- Original Message ----------------------------------
From: "Mattias Rickardsson" <mr@...>
Date: Fri, 20 Aug 2004 17:33:38 +0200 (CEST)


robin.birch@... said:
One of my hobbies is amateur radio. Several years ago I brought back to
like some World War 2 vintage transmitters that had 1.2kV as the HT line.
Not a lot compared to a CRT EHT supply but this was at about 200mA and so
could pack quite a punch.

I was advised by several people, my father - a retired radar design
engineer, and several other amateurs who had been down the same path, to
put the sets and the PSUs in the airing cupboard for a couple of weeks
before I tried anything - just to get the moisture out of wires, switches,
dust, paper insulation and so on.
...
FWIW I don't think that a desiccant will remove damp from equipment,it may
help stop dry equipment getting damp in the first place,but if the kit has
been unused for some time and may have got cold/damp or just a little
unloved, then I would repeat my process with the transmitters before I was
tempted to put some volts on.
Thanks for the advice, Robin!

English is not my native language and I'm not a radio amateur (then I must
be a radio professional?;) knowing what furnitures you tend to have at
home, so I have to ask:
That "airing cupboard" doesn't use heated air, does it?

In that case, I guess baking may be unnecessary.
Maybe a hair blower with hot air would make some wonders?


/mr




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Re: Chart Recorder Paper

Joseph DiPietro <joed@...>
 

Omega probably has it, at a price.
I've looked at omega.com, didn't find anything suitable.

I'm wondering if any of you resourceful folks out there have found any good
alternatives for 2" thermal chart-paper.

Joe
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Checked by AVG anti-virus system (http://www.grisoft.com).
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Baking scopes

jim_beacon2000
 

Mattias,

an airing cupboard is normally the cupboard (closet) which huses the hot water tank for the house. Normally, linen and clothes are placed there after drying outside, to drive off any remaining dampness (the linen also helps insulate the tank, and reduce energy wastage).

I work in the air traffic control industry, and the two yearly maintenance on our old airport radars used to involve taking the cabinets and electronics outside, and washing them with a hosepipe and de-greaser, to remove the build up of jet fuel and soot. If you didn't do this, the EHT insulation would breakdown. The equipment was then left out in the sun to dry for a couple of days, before being re-assembled. I should mention that this was in the days of all valve radar, and that the equipment was "tropicalised" - all the components were designed to resist moisture and fungus.

Jim.
Please see our website the " Vintage Communication Pages" at WWW.G1JBG.CO.UK


Re: Baking scopes?

Mattias Rickardsson
 

robin.birch@... said:
One of my hobbies is amateur radio. Several years ago I brought back to
like some World War 2 vintage transmitters that had 1.2kV as the HT line.
Not a lot compared to a CRT EHT supply but this was at about 200mA and so
could pack quite a punch.

I was advised by several people, my father - a retired radar design
engineer, and several other amateurs who had been down the same path, to
put the sets and the PSUs in the airing cupboard for a couple of weeks
before I tried anything - just to get the moisture out of wires, switches,
dust, paper insulation and so on.
...
FWIW I don't think that a desiccant will remove damp from equipment,it may
help stop dry equipment getting damp in the first place,but if the kit has
been unused for some time and may have got cold/damp or just a little
unloved, then I would repeat my process with the transmitters before I was
tempted to put some volts on.
Thanks for the advice, Robin!

English is not my native language and I'm not a radio amateur (then I must
be a radio professional?;) knowing what furnitures you tend to have at
home, so I have to ask:
That "airing cupboard" doesn't use heated air, does it?

In that case, I guess baking may be unnecessary.
Maybe a hair blower with hot air would make some wonders?


/mr


Chart Recorder Paper

Joe D <joed@...>
 

Has anyone found a source for the 2" wide chart recorder paper for
the 1502/1503 TDR's? I have looked at calculator and cash register
thermal-paper, but it all seems to be 2-1/2 inches wide or wider.

Thanks,

Joe


Re: Baking scopes?

Mattias Rickardsson
 

Rasputin Novgorod <priapulus@...> said:

The Tek wash & dry makes sense.

A friend suggested to me that if you have electronics
that hasn't been powered up in a long time, and uses
high voltages, it would be wise to place a desicant
pack in that unit for at least a week before it is
used.

He felt that after several years unused, the phenolic
board has probably absorbed considerable moisture
from the air. The transistors and diodes close too
the high voltage supply don't like the leakage.
Interesting.
So moisture would be a problem even if the scope isn't washed?

What do you think? Old wive's tail, or good idea?
I don't know. Maybe baking them would be an even better solution, even if
not having washed them before?

How important is the washing, and what exactly does it give me?

Hmmm... I wonder how efficient those old/used "silica gel" desiccant packs
which are often found in shoe boxes and other packages are... can they be
reused?


/mr - with loads of untested Tek gear to take care of... 8-)


Crystals for 1L5

jim_beacon2000
 

Hi,

further to my earlier post....

Does anyone have a pair of 100KHz crystals for a 1L5 plug-in? I am told the part number is 158-0022-00.

Thanks

Jim.

Please see our website the " Vintage Communication Pages" at WWW.G1JBG.CO.UK


Re: dso scope recommendations

Dieter Teuchert
 

Hi,
a year ago i won a 9314 LeCroy Scope at ebay.com. It had some knobs missing and a burnt resistor in the power supply and came DOA for US $ 400 plus shipping. It has 300 MHz bandwidth on four channels and 10K points per channel.

A very nice machine with lots of features, like complete statistical data collection and analysis. My scope saves screens as TIFF files on a PCMCIA SRAM card. Have rarely used any other scope ever since.

If you can afford a 9314A or 9314C, even better. Its processors are faster. Sometimes you will also see models like 9314AM and 9314AL, which have longer trace memories. Sometimes these scopes come with even more software option packs supporting advanced signal analysis like FFT ... LeCroy calls those packages WP01 and WP02.

Regards,
Dieter Teuchert

Bob Japundza wrote:

Hi All,

I'm a lurker on this list having owned a Tek 468 for a while now. I've been needing some more advanced DSO features and am looking at some of the TDS-series scopes, keeping an eye on ebay for a good one. I'm looking to spend $500-$600. Are there any scopes in the TDS series that I should avoid?

Regards,
Bob




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Dipl.-Phys. Dieter Teuchert
Software und Systeme
Postanschrift:



Telefon:
Telefax:
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EMail pers�nlich:
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Re: TDS540 Calibration Procedure??

gettingalongwouldbenice
 

--- In TekScopes@..., "Denis Cobley" <denis.cobley@n...>
wrote:
I have some bad news then.
Without a Tek Scopecal ATE system or the software + all the required
test
equipment specified in the manual you have no chance.
Even with this you will have an uphill battle.
snipped more useful information, thanks.

Let's assume that I DO like uphill battles. Let's also assume that
I CAN get my hands on adequate test equipment. I designed pieces
of some of the TEK scope cal equipment, so I'm not totally in the dark.
If it can be approximated without the ATE system, I have a chance
of doing it.

Where might I obtain the PC software to run the cal procedure?

Is there any available documentation on what GPIB commands are
sent to put the machine into calibration mode and step thru the process?

I'd like to take a poke at it. Ain't doin' no good sittin' here
on the floor broke...

Thanks, mike

Yahoo! Groups Links







Re: 1L5 Spectrum Analyzer

Craig Sawyers <c.sawyers@...>
 

Hi Jim

I'll bet the seller said that it was in working condition when pulled from
service....

There are two identical crystals supposed to be in there - 100kHz. Tek part
number is 158-0022-00. The can is rather tall, presumably because the
crystal is physically large given the frequency - 1.5".

Good luck

Craig

-----Original Message-----
From: Jim Beacon [mailto:jim@...]
Sent: 20 August 2004 08:20
To: Tekscopes
Subject: [TekScopes] 1L5 Spectrum Analyzer


Hi,

I've just received a 1L5 from eBay. On close inspection, there
seem to be two components (crystals?) missing from the variable
resolution amp board, component references Y344 and Y325. Can
anyone confirm what, if anything, should be in these positions?

Also is there a freely dowloadable copy of the manual available anywhere?

Thanks

Jim.

Please see our website the " Vintage Communication Pages" at
WWW.G1JBG.CO.UK








Yahoo! Groups Links


1L5 Spectrum Analyzer

jim_beacon2000
 

Hi,

I've just received a 1L5 from eBay. On close inspection, there seem to be two components (crystals?) missing from the variable resolution amp board, component references Y344 and Y325. Can anyone confirm what, if anything, should be in these positions?

Also is there a freely dowloadable copy of the manual available anywhere?

Thanks

Jim.

Please see our website the " Vintage Communication Pages" at WWW.G1JBG.CO.UK


Re: TDS540 Calibration Procedure??

Denis Cobley <denis.cobley@...>
 

I have some bad news then.
Without a Tek Scopecal ATE system or the software + all the required test
equipment specified in the manual you have no chance.
Even with this you will have an uphill battle.
The first step in all these cals is to run the SPC - if this fails it
normally will bug out of the cal process.
The SPC only does DC gains & balances/offsets - it is NOT a calibration -
that is why it's called "Signal path compensation".
If it was a self cal the Tek would have called it that (some scopes do have
that capability like the 11K series).
I have been involved in many repairs on this product with the Tek ATE which
you can force past the SPC pass requirement. In almost every case you then
end up with a power up failure and / or a Cal failure on the cal status
screen.
This is because you actually have a fault but it is more a degradation of
performance of the digitiser ASIC for a channel.
The message is "Dac Value out of bounds" which means the unit cannot get the
adjustment to pass and meet the engineering limits Tek set on the DAC number
for a particular adjustment (normally 700-4500 or similar - varies from
model to model) that is stored as the corrected value for that function.
Good luck going forward - you will need it.
As a general warning to all on the list - buying any TDS500 (or most TDS
scopes) if they show acquisition failures then you had better be prepared to
lose all your money because other than leaky caps you have a low chance of
completing a successful repair (passes all daigs and cal with a clear error
log). I would insist on a picture of the error log if I was buying to use it
as a scope (I often buy for parts).
If the error log was clear, it passed SPC and showed all passed on the cal
status then you are reasonably OK (other than it is out of support and Tek
have no parts if you could afford them)
If Tek had an exchange acquisition board it could cost about $2000+ a full
cal after fitting it.
Working TDS scopes are a great scope - faulty ones are not.
Regards
Denis Cobley
www.newteksupport.com

----- Original Message -----
From: "gettingalongwouldbenice" <gettingalongwouldbenice@...>
To: <TekScopes@...>
Sent: Friday, August 20, 2004 10:59 AM
Subject: [TekScopes] Re: TDS540 Calibration Procedure??



--- In TekScopes@..., "Denis Cobley" <denis.cobley@n...>
wrote:
Hi
SPC has to pass before you attempt any cal adjustments - if SPC
failed then
you still have a 95% chance of a hardware problem.
You seem to have a DAC problem.
snipped very helpful input.

Thanks for the suggestions. I'll go see if I can figure out
what's happening in the DAC system.

Let's look at the SPC logically. Since I don't have any real facts,
that's all I got. My understanding is that SPC can compensate
for minor temperature variations in the calibration. If it would
pass with ANY or CORRUPTED calibration data, there'd be no need to
ever (externally) calibrate the unit. It would just self-cal and meet
specs.

I propose that a badly miscalibrated unit might fail SPC???

If the calibration constants are so far out that the minor tweeking
of SPC couldn't fix it, one would need to (external) recal to get
things back into the ballpark.

Remember that I've got two acquisition boards with the same symptom
on all 8 channels. And that the boards have been swapped around and
the calibration constants blown away. The control board probably
isn't even sure whether it's a 520 or 540.

Now, if you'd said that it has to pass power on self test before
attempting calibration, I'd agree. It does pass that test.

Bottom line is that eventually I'll need to calibrate the system.
Where can I find the calibration software? I tried to look in
the tekscoparc group, but the moderator either isn't paying attention
or doesn't want me in there. :-(

I do have a working TDS540, but I'm unwilling to swap boards into there
until I have the calibration issues resolved. I already got two
bad scopes...I don't need three ;-)

Thanks, mike






Yahoo! Groups Links







WTD: TEK 7623A or 7633

w1ksz <w1ksz@...>
 

Looking for one to mate up with my 7L12.
I have a large collection of "real blue" Tek Service manuals
and NIB Tek parts. If you are interested in a trade, let me know
and I'll forward my list for you to peruse.

Regards, Dick, W1KSZ


Re: Resurrected 11402 and plug-in compatibility

Denis Cobley <denis.cobley@...>
 

Hi
The 7K units are vertical plug in 's only - no sampling, timebase or specan,
curve tracer plugs.
This is because the 11K slots are all vertical only - the timebase is
digital and will not accept any plug that produces a ramp for sweeping.
Also, you need to cut the rear plastic of the 7K unit (look at them side by
side to see the difference.
Then, when you have it in the scope you will need to select it manually as
the scope cannot "see" it.
I would just buy some more plugs on ebay.
Regards
Denis Cobley
www.newteksupport.com

----- Original Message -----
From: "madmanoneresurrected" <madmanoneresurrected@...>
To: <TekScopes@...>
Sent: Friday, August 20, 2004 10:04 AM
Subject: [TekScopes] Resurrected 11402 and plug-in compatibility


After grabing a 11401 off EBay and finding that it has 1 defective
aquisition module (U552), I saw a 11402 on EBay for a song that only
had a (e2211) Hard Keys panel error (replicated this code on the
11401) so I grabbed it off EBay and canabalized the 11401's front key
panel (which is also the touch screen matrix) for the 11402 and I now
have a fully functional 11402 w/1 - fully functional 11A71.

Now to the point of the post. It says in the diagnostics that it will
use 11k/7k plugs. My question is does anyone have a list of the
supported 7k series plugs for this unit. Also one other one that came
to mind, If it supports the 7k plugs will a 7L12, 7L13 or 7L14
Spectrum analyzer plug work in the empty space provided by the center
and right slots?.

Thanks






Yahoo! Groups Links






Re: TDS540 Calibration Procedure??

gettingalongwouldbenice
 

--- In TekScopes@..., "Denis Cobley" <denis.cobley@n...>
wrote:
Hi
SPC has to pass before you attempt any cal adjustments - if SPC
failed then
you still have a 95% chance of a hardware problem.
You seem to have a DAC problem.
snipped very helpful input.

Thanks for the suggestions. I'll go see if I can figure out
what's happening in the DAC system.

Let's look at the SPC logically. Since I don't have any real facts,
that's all I got. My understanding is that SPC can compensate
for minor temperature variations in the calibration. If it would
pass with ANY or CORRUPTED calibration data, there'd be no need to
ever (externally) calibrate the unit. It would just self-cal and meet
specs.

I propose that a badly miscalibrated unit might fail SPC???

If the calibration constants are so far out that the minor tweeking
of SPC couldn't fix it, one would need to (external) recal to get
things back into the ballpark.

Remember that I've got two acquisition boards with the same symptom
on all 8 channels. And that the boards have been swapped around and
the calibration constants blown away. The control board probably
isn't even sure whether it's a 520 or 540.

Now, if you'd said that it has to pass power on self test before
attempting calibration, I'd agree. It does pass that test.

Bottom line is that eventually I'll need to calibrate the system.
Where can I find the calibration software? I tried to look in
the tekscoparc group, but the moderator either isn't paying attention
or doesn't want me in there. :-(

I do have a working TDS540, but I'm unwilling to swap boards into there
until I have the calibration issues resolved. I already got two
bad scopes...I don't need three ;-)

Thanks, mike


TEK 485 - need help

ehsjr@...
 

Intensity way too bright & no control of it. Details below.

A while back I posted on this scope. It completely died, but I found
and fixed that problem. It was caused by a leaky .001 uf cap in the
cathode regulator. (C1611) Replaced the cap, & it powered up - but
I have no control over the intensity. It is far too bright. All voltages are ok,
and it displays the proper waveforms. With no input and no trigger,
it creates a VERY bright spot on the left of the screen. Documentation
tells me the grid is supposed to be more negative than the cathode - but
does not give me a voltage. I believe my problem is in that area, but I
don't know how to test. I have (repeatedly) tested every diode in the
grid and focus DC restorer circuits, and checked every cap for leakage.

Can I connect one lead to the cathode and the other to the grid with
an 11 meg input on my DMM, or does that load down the grid too
much ? And, if I can, how much difference should I see? My
"HV probe" is a home made ~ 100 meg string of ten 10 meg resistors.
With it, I see the same voltage on the grid or cathode with respect to
ground. Varying grid bias has no effect on the intensity, nor does
varying the intensity control change the intensity on the screen. However,
varying the intensity control does change the amplitude of the signal
at the anode of CR1660, while varying the grid bias has no effect
on that amplitude. (As seeen with a separate 475 scope.)

I'm lost. Any help would be appreciated, especially what to look for
at 1653 and TP 1665.

Thanks,
Ed


Rack mounted 453

campionrabbit <thudson@...>
 

Howdy all,

I'm new to this website so forgive me if I'm asking a question that
may have been asked before. I have a 453 that I would like to
convert into a rack mount. Does anyone know how I can do this?

Many Thanks!


Resurrected 11402 and plug-in compatibility

madmanoneresurrected <madmanoneresurrected@...>
 

After grabing a 11401 off EBay and finding that it has 1 defective
aquisition module (U552), I saw a 11402 on EBay for a song that only
had a (e2211) Hard Keys panel error (replicated this code on the
11401) so I grabbed it off EBay and canabalized the 11401's front key
panel (which is also the touch screen matrix) for the 11402 and I now
have a fully functional 11402 w/1 - fully functional 11A71.

Now to the point of the post. It says in the diagnostics that it will
use 11k/7k plugs. My question is does anyone have a list of the
supported 7k series plugs for this unit. Also one other one that came
to mind, If it supports the 7k plugs will a 7L12, 7L13 or 7L14
Spectrum analyzer plug work in the empty space provided by the center
and right slots?.

Thanks

185221 - 185240 of 193923