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Re: TDS784D with faint display and blurry image
Hello Jay,
Nice to hear from you again, old coot. Was worried you closed down. Good that is not the case, just in case I ever need any more repairs done. Either way: the Tds754D survived the trip to Budapest and is currently my main scope as the LeCroy is down for maintenance. I am a very happy camper, even though I prefer the LeCroy UX for daily work. The Danaher is fast, but highly unintuitive especially when you use FFT. If I remember correctly, I paid like 150 USD for the memory issue and another 150 for the display. Please correct me if I am wrong. All the best Tam --- With best regards Tam HANNA (emailing on a BlackBerry PRIV) Enjoy electronics? Join 14k other followers by visiting the Crazy Electronics Lab at |
Re: Soul searching = Lab Purge
On Mon, Sep 28, 2020 at 08:31 AM, Lawrance A. Schneider wrote:
Floppy drives, 5 inch LCD monitor, old PC case brackets, useless electronics parts like 30 year old MMICs... Junk. Montreal. |
Re: TDS 684A needs recapping?
On Mon, Sep 14, 2020 at 8:52 AM Sigur?ur ?sgeirsson <siggi@...> wrote:
On Sat, Sep 12, 2020 at 10:06 AM Rogerio O <rodd414@...> wrote:Hey Roger,Concerning the NVRAM, I have read conflicting information about loosing I'd like to amend my statement here, as I'm likely wrong about this as far as concerns your scope. I've just downloaded the TDS NVRAM saver application from this EEVBlog thread: . According to the information in there, the B/C/D-series scopes have an EEPROM for calibration data on the acquisition board, whereas the earlier scopes stored the calibration data in NVRAM. I'm guessing this is the source of confusion - not all the TDS5/6/7XX scopes are the same in this respect, whereas people (like me) assume they are. There's an info.txt file in the archive with a description of the various tools, where it says: "tdsAcqEEPROMFloppyDumper and tdsAcqEEPROMMinimalFloppyDumper: Dumps the contents of the calibration constants 24C02 EEPROMs located on the acquisition boards of the -B, -C and -D series scopes, to a file. *-A series scopes have no such EEPROMs on the acquisition board andstore these constants in regular NVRAM, albeit in a hardware-protectedregion*. Both 24C02 EEPROMs are read as 0x200 bytes in a single file, where the first EEPROM is the top 0x100 half of the file, and the second one the bottom half." Siggi |
Re: TDS5/6/700 application software packages?
On Tue, Sep 29, 2020 at 9:36 AM <hassett31@...> wrote:
I would be on-board with wanting the software as well. More interestinglyWhether it was "easy" to develop these applications largely depends on the API the scope exposes, the documentation provided and the development environment. Did it give you some way to debug your application in place, as a case in point? The only recent use of the Java API I'm aware of is this: . |
Wierd Tek485 intensity problem
Hi there,
I'm new here in this group, but I'm Tek user (and have to say hooked on their scopes) for quite a while now. Few days ago I acquired 485 in a pretty good mechanical shape, but only partially working. I've wanted 485 since it is quite fast (350MHz @ 50ohm Zin) and also was intrigued by this particular specimen since it came with P11 phosphorus CRT, and it is quite rare and pretty. Oscilloscope had few problems. Broken cooling fan, missing CRT protective glass, missing a trace when time base is set to 50ms/div or slower, delayed sweep not working, badly uncalibrated vertical amplifier and one a little strange problem I found out about only after fixing it. So, I glued fan and made a little metal clamp for it, made a new protective glass out of a blue plexy, replaced leaky CR1534 in beam current limiter amplifier, replaced bad Q1074 in B trigger circuit and calibrated whole vertical amplifier (it was a lot of work since someone played with every single trimmer, and to tell the truth there are a lot of 'em). After this,oscilloscope worked nicely, but I found yet another, and a little strange problem I could not fix, so I decided to write a little post here to see if any of You have some useful ideas... When I turn on my 485 and set it to delayed sweep mode, intensified A or alternating, there are two problems with intensity. Firstly intensified part of A sweep is poorly intensified even with B intensity all the way up (if I do this i ALT mode, B trace is shining like crazy, so B intensity is working as expected), and also if A intensity is just a little turned up (so that A trace is not yet visible) B trace intensity can not be set to zero even with B intensity control set all the way down. So to make a long story short, if I set my 485 to delayed sweep ALT mode (for example) to make intensified portion of A sweep I nave to turn B intensity almost all the way up, and that makes B trace extremely bright. I poke a bit around U1560, found its datasheet on the internet so I analyzed its inner workings and then measured resistor network connected to pins 16,1 and 2 (common emitters of 'A', 'B' and 'A-intensified' differential amplifiers) and all the values are good, so I have reached a dead end. I even tried replacing U1560 with the one from a well-working 485, and there was no change. Also tried putting U1560 form 'bad' 485 to working one, and it worked just fine, so U1560 is good, resistor network is good, and I have no other ideas how to fix the 'A intensified' problem I have! Thank You for any ideas or help, and all the best from Ivan! |
Re: TDS784D with faint display and blurry image
Hello,Hi Tam, To be fair, I only gave you that price as I was repairing your acquisition board for memory failures. There's no way I could do the repair for that price if that were all I was doing... Thanks for the kind words, though! Jay |
Re: Shipping Scopes
On 29/09/20 04:22, Dave Seiter wrote:
Implode if dropped! Still, I doubt they would treat it any differently. On Monday, September 28, 2020, 05:40:31 PM PDT, John Williams <books4you4@...> wrote:Many decades ago I heard the, probably apocryphal, tale that a manufacturer of aquariums did just that, on the principal that the shippers would not want to clean up broken glass. 35 years ago I did once (twice really!) put a 465 into the hold of an aircraft without any packaging, since they suddenly decided they didn't want it as cabin baggage. They put it in a plastic crate on the conveyor belt. Simpler times. |
Re: How to make a 500 series plug-in extender
Why is the shipping wrong?? The seller will probably put them in a layer of bubble wrap and ship them in a fixed rate padded envelope; that's about $7.75.
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The extender looks like the one I have. -Dave On Monday, September 28, 2020, 11:29:14 PM PDT, snapdiode via groups.io <snapdiode@...> wrote:
50$ you get three pairs of connectors or just use the extenders. Of course the shipping must be wrong. |
Re: Shipping Scopes
I'm replying to my own post to clarify.
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I sell a lot on eBay. I have a stellar record for my packing jobs, but I don't do free freight without determining what the actual cost is likely to be for the locations I am willing to sell into, and factoring that into the price. Certain items, such as fragile equipment with tubes and other glass, I specify in the sale terms a high packing fee with shipping on top of that. I charge more for the necessarily more stout packing used for heavy package international shipping. Yes, domestic UPS and FedEx can be hard on packages, but international is the big leagues when it comes to package abuse. Back to eBay: Feedback is very important. If you don't try to provide negative feedback, a deceitful/unscrupulous seller will continue to be dishonest. Yes, dishonest. Many cheat sellers will offer free freight and then do a really crappy pack job, or they will understate shipping cost because they want to maximize sell margin, OR they will give a proper rate for shipping and then pocket extra money by using a cheaper service or doing a substandard pack job. Negative Feedback is one of the few ways to leverage a proper resolution and the only way to protect future buyers from such cretins. Sometimes a seller will be significantly more willing to "make it right" if you initiate the eBay feedback process and indicate Negative Feedback may be forthcoming. Don't just slam the seller immediately, give them a change to fix things, but don't be timid about calling them on it. Teddy Roosevelt had it right. Thomas Garson Aural Technology, Ashland, OR By my calculation, the dynamic range of the universe is roughly 679dB, which is approximately 225 bits, collected at a rate 1.714287514x10^23 sps. On 9/28/20 7:44 PM, Thomas Garson wrote:
Make sure to enter bad feedback, and be very clear about why. |
Re: How to make a 500 series plug-in extender
Be very careful with these connectors, the alloy is a durable contact surface but also very brittle. If you bend a solder tab, don't unbend it, it will snap off.
Here's a nice long one /g/TekScopes/album?id=12911 |
Re: Shipping Scopes
Implode if dropped! Still, I doubt they would treat it any differently. On Monday, September 28, 2020, 05:40:31 PM PDT, John Williams <books4you4@...> wrote:
You know, I have often thought of trying this. Here goes. Forget the box, forget the packing. Stick a tag and a ups shipping form on the side of the bare scope and send it off to ups. I wonder if they would be more careful. Maybe a label like ¡°will explode if dropped.¡± No just kidding. Do not try this. |
Re: Shipping Scopes
John,
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That sounds a lot like the famous "flying clock" experiment to test the time dilation predictions of special relativity! Quite a story. I think might be a challenge getting through TSA with cesium clocks and you would not want to x-ray them. Long baseline interferometry is still being done I think. Do you know how they sync the receivers now? There are ruggedized cesium clocks used by the military and aboard GPS satellites. The ones used on the GPS satellites have to withstand launch g-forces. Steve On Mon, Sep 28, 2020, 22:59 John Williams <books4you4@...> wrote:
Very interesting Steven. As far as shipping something with no danger of |
Re: Shipping Scopes
Very interesting Steven. As far as shipping something with no danger of damaging it, maybe from The Starship Enterprise by transporter beam! In 1969 we started doing long baseline interferometry which involved recording radio telescope observations from three different radio observatories around the world on 2 inch video tape. Once the observing process was completed the tapes were all shipped to Ottawa for computer processing. Recorded on the tapes was also a timing track consisting of pulses from a caesium standard. So along with the tapes, the caesium clocks had to also be shipped so they could all be synchronized. The only way we could make sure they wouldn¡¯t be damaged in transit was to buy two airline tickets. There was one for the technician, and the other was for the clock. They had to be in first class as the clock was too wide for coach seats. It did turn some heads of the other passengers to see this huge case in the seat, with lights blinking and radiation warning stickers plastered all over it. Those were the good old days.
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Re: Shipping Scopes
Make sure to enter bad feedback, and be very clear about why.
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Thomas Garson Aural Technology, Ashland, OR By my calculation, the dynamic range of the universe is roughly 679dB, which is approximately 225 bits, collected at a rate 1.714287514x10^23 sps. On 9/28/20 3:51 PM, David Collier wrote:
Just received a Heathkit IO-10 from the USA via the Global Shipping Service. It was loosely packed in a cardboard parcel and had clearly been dropped from waist height onto concrete! Hence one large electrolytic had broken away from its paxolin base; all three large compactrons were half out of their sockets at the same angle, and the chassis was bent on one side. The CRT survived but has something loose inside, so may or may not work. |
Re: Shipping Scopes
Thank you very much, Dick. I had no idea!
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(But the IO-10 does not seem to use Compactrons, at least from a quick skim of the schematic) -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way Stanford University Stanford, CA 94305-4070 On 9/28/2020 19:27, K9FFK wrote:
Heath IO-14 4 compactrons in regulated, low voltage supplies. |
Re: Shipping Scopes
Steve,
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There is a way to ship something with no damage and that is to pay for my service. Since I am the only person to handle the item from the time that I pick it up at the seller and then deliver it to the buyer there is no chance of it being damaged. It is kept in a climate controlled environment at all times. Either in the car or in the motel room with me. Room temperature and low humidity. You save on the packing materials since I will not drop it and it won't be subject to strong vibrations nor shocks. GOD Bless and Thanks, rich! On 9/28/2020 9:12 PM, stevenhorii wrote:
I don't know that there is any 100% certain way of shipping something so it |
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