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Re: Baking scopes?
Mattias Rickardsson
robin.birch@... said:
Aaaah, British luxury... what a pity that our swedish houses have properThat "airing cupboard" doesn't use heated air, does it?It is the cupboard that holds the domestic hot water cylinder. It is 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. Very true. I'll have to find some cosy place for my Tek pile.Maybe a hair blower with hot air would make some wonders?Yes, but I think that the longer the better, hence leaving the kit /mr
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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,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). 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. WWW.G1JBG.CO.UK
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Re: Baking scopes?
eboytoronto
Hi,
toggle quoted messageShow quoted text
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)
________________________________________________________________ Sent via the WebMail system at aztec-net.com
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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 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.740 / Virus Database: 494 - Release Date: 8/16/2004
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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
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Re: Baking scopes?
Mattias Rickardsson
robin.birch@... said:
One of my hobbies is amateur radio. Several years ago I brought back toThanks 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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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
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Re: Baking scopes?
Mattias Rickardsson
Rasputin Novgorod <priapulus@...> said:
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-)
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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
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Re: dso scope recommendations
Dieter Teuchert
Hi,
toggle quoted messageShow quoted text
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, --
Dipl.-Phys. Dieter Teuchert Software und Systeme Postanschrift: Telefon: Telefax: EMail Firma: EMail pers�nlich: Internet: Rommelstr. 6 D-76571 Gaggenau Germany +49 7225 989253 +49 7225 989254 info@... dieter@... _http://www.cadt.de_
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Re: TDS540 Calibration Procedure??
gettingalongwouldbenice
--- In TekScopes@..., "Denis Cobley" <denis.cobley@n...>
wrote: I have some bad news then.test equipment specified in the manual you have no chance.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
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Re: 1L5 Spectrum Analyzer
Craig Sawyers <c.sawyers@...>
Hi Jim
toggle quoted messageShow quoted text
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-----WWW.G1JBG.CO.UK Yahoo! Groups Links
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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
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Re: TDS540 Calibration Procedure??
Denis Cobley <denis.cobley@...>
I have some bad news then.
toggle quoted messageShow quoted text
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??
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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
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Re: Resurrected 11402 and plug-in compatibility
Denis Cobley <denis.cobley@...>
Hi
toggle quoted messageShow quoted text
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
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Re: TDS540 Calibration Procedure??
gettingalongwouldbenice
--- In TekScopes@..., "Denis Cobley" <denis.cobley@n...>
wrote: Hifailed then you still have a 95% chance of a hardware 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
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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
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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!
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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
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