开云体育

Hi Michael and others on this thread , just to add my few pennies worthSeveral years ago when postal charges were more reasonable I bought over a short period 3 Tek 7k scopes 7854,7834 and a 7104 from sellers in the US. They all arrived intact surprisingly here in the UK and had little more than 1 layer of small bubble and 1 layer of corrugated card held in place with scotch tape . No dents in cases , no broken knobs or CRT's .With such limited protection just 1 intact would be thought a miracle but all 3 must be credit to USPS often criticised on groups like this .I think it shows that its not just the sellers not knowing how to pack , the shippers need to know how to handle such things . Maybe the skimpy wrapping allowed the shippers to see that even though it was heavy , it was still fragile and they treated it appropriately .Obviously I cant comment on how it would be handled these days
Brian

Winning bid was $228.50, not a bad price but who knows what freight will be.

Paul

--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@... | Unix/Linux - We don't do windows

On Tue, Sep 29, 2020 at 11:12 AM, Roy Thistle wrote:

The OP is trying to explain that the shipper told him not to worry... that the
he (the shipper) would pack the 545 up... supposedly well. But, it didn't go
well.

Roy,

Sadly, Most E-Bay sellers (and sellers on all platforms) just do not understand how heavy and how delicate these scopes are. Remember that most of them are regular folks (Zero Electronics Experience) and they honestly believe that they are packing these instruments well. It is almost impossible to explain to many people the level of protection that is necessary. From our perspective, It seems obvious, to others, those less well versed in these instruments, not so much; a layer of bubble wrap, a few chunks of Styrofoam and some kraft paper seems totally fine. I suppose that because these things are big and heavy (like and anvil) that the shippers seem to believe that these scopes have the durability of an anvil?

--
Michael Lynch
Dardanelle, AR

Well... here's a link on how not to pack a 500... apparently.
The OP is trying to explain that the shipper told him not to worry... that the he (the shipper) would pack the 545 up... supposedly well. But, it didn't go well.

On Tue, Sep 29, 2020 at 10:27 AM, Vince Vielhaber wrote:

I do the same thing, it's just odd that it only has the opening bid. Maybe
something to do with the shipping...

Vince.

Shipping is by "freight" and that typically will cost between $200 and $700, depending on where it is going and if the buyer wants door to door service or pick up at terminal service. The freight is going to be considerable and their is going to be a lot of last minute bids. I'm betting that the snipers are all over this one.

--
Michael Lynch
Dardanelle, AR

I do the same thing, it's just odd that it only has the opening bid. Maybe something to do with the shipping...

Vince.

--
K8ZW

Someone may have a snipe on it; I always snipe on bidding auctions.
Watch the price shoot up during the last 90 seconds. Given the price
these things seem to go for currently, I doubt it will end up under
a couple hundred.

Paul

--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@... | Unix/Linux - We don't do windows

There's a Tek 576 Curve Tracer on ebay with just under 2 hours left. This thing looks like someone's gonna get it for the opening bid of about $100.

Item # 254726651456

Vince.
--
K8ZW

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)

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On Mon, Sep 28, 2020 at 08:31 AM, Lawrance A. Schneider wrote:

On Sun, Sep 27, 2020 at 10:52 PM, snapdiode wrote:

unloading years of meaningless material cruft

Like what? And where do you live?

larry

Floppy drives, 5 inch LCD monitor, old PC case brackets, useless electronics parts like 30 year old MMICs... Junk.
Montreal.

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:

Concerning the NVRAM, I have read conflicting information about loosing
the calibration if I replace it.

The calibration data is stored in the acquisition board in EEPROM per the
service manuals, which makes sense for board-level serviceability.

Hey Roger,

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

On Tue, Sep 29, 2020 at 9:36 AM <hassett31@...> wrote:

I would be on-board with wanting the software as well. More interestingly
I wonder what 3rd party application were made? It's just Java so
development would have been easy.

Whether 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:

.

On my end it shows 120$ US for the shipping. Unless the bubble wrap is the size of a zeppelin, that's a bit on the high side I think. Must be the eBay automatic shipping calculator that's a bit bananas.

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!

I would be on-board with wanting the software as well. More interestingly I wonder what 3rd party application were made? It's just Java so development would have been easy.

Hello,

in case anyone wants to use JWalling's services, I made a few pictures of the installation on my TDS754D:




Sorry for praising him so much, but I am really, really happy with the work he did for me. Lovely price, perfect repair.

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

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:
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.

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.

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.
The extender looks like the one I have.
-Dave

50$ you get three pairs of connectors or just use the extenders.

Of course the shipping must be wrong.

I'm replying to my own post to clarify.

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.