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FS: Tektronix TDS2024 Oscilloscope
Hello All,
I have for sale a Tektronix TDS2024 200 MHz, 4 channel, oscilloscope.? It passes all self tests and self calibration and has a good display.? There some staining on the top of the case where it looks like someone used a solvent to remove a sticker.?? It does include a TDS2CMax communication module.? It does not include probes or other accessories.?? I cannot guarantee the calibration on this so I am selling it AS-IS.? The price is $375 plus shipping.? Located in Maryland USA. Tom Bryan N3AJA |
Re: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?
Instead of a latch, I used a small cabinet pull for the module extender I built. I don't see a need for latches for anything short of California's "big one".
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John On 1/10/2021 9:06 AM, Harvey White wrote:
I agree, latches are different.? What I was thinking of is that the extrusions for the 7000 series, if worked upon, could be used.? I'm assuming that the extrusions are the difficult part, and if the latch is not important, it may be left out. |
Re: SC-502 transistor
I had a similar thing with a 2235 once.
I did a ringing test that showed me the transformer was bad. Google "ringing test transformer" and you will find info. Basically it's very simple to do: Use a low repeat rate fast rise square wave generator and apply this pulse to the primary winding, this can be done in circuit. Use a scope to look at one of the secondary windings, you should see the ringing being damped out slowly and nicely. If it damps out in only 2-3 cycles, the transformer has a short. Good luck, Leo |
Re: Tek 576 step generator problem
It looks like a "broken trace " issue to me.
Please ref to my 577 repair log: </g/TekScopes/topic/tek_577_d1_repair_b07xxxx/77914568?p=,,,100,0,0,0::recentpostdate%2Fsticky,,,100,2,0,77914568> Please check the waveform of the staircase if you have a scope. Jack |
Re: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?
Hello Larry,
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I would like to check, once more, that I am definitely included as I do not (explicitly) see my initials on your latest list. Given my French name in two words, my initials should be "RLG" and not "RG" or "RL"). Please confirm, and (possibly) amend. Cheers, Rick (from AUS). On 11 Jan 2021, at 09:32, Larry McDavid <lmcdavid@...> wrote: |
Re: [dead tek 485] Can i fix it ? (newbie here)
Jeff,
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According to the 1976 Tek catalog, the recommended probes for 50 ohm mode were P6056 (10x), P6057 (100x), and P6201 (FET). The P6202A (FET) would also be fine. For 1M ohm input, the recommended probes were P6053B (10x) and P6063A (1x/10x). Bandwidths varied. The 485 has power connectors for the FET probes. You can download the catalog from: --John Gord On Sun, Jan 10, 2021 at 08:39 PM, Jeff Dutky wrote:
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Re: [dead tek 485] Can i fix it ? (newbie here)
Hi, Jeff,
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The manual I have lists several probes on page 1-3, with the P6053 being the only 10:1, 1 megohm probe mentioned. The P6106 was (and is) commonly found connected to the 485, too, though. In the 1 meg mode, the bandwidths of the 485 and 475 are both around 250MHz with either of those probes, as long as they're 2m or less in length. And yes, the el cheapo Chinese probes often found on eBay are pretty rough at 200MHz (you can already see significant pulse response aberrations at 100MHz). The ones I've disassembled don't use resistance wire at all -- just something resembling ordinary RG-174 and a couple of damping resistors. I was actually impressed that they worked as well as they did, but that's only because my expectations were even lower. -- Cheers, Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way Stanford University Stanford, CA 94305-4070 On 1/10/2021 20:39, Jeff Dutky wrote:
Tom, |
Re: Update on Domestic US Book Delivery Dates
Sorry to disagree with all the naysayers but from the emails I have received so far the books are arriving ON or AHEAD of the estimated dates on the receipt I got from the post office.
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I don't expect every one of the 76 books to arrive by Monday evening but I would not be surprised if at least 85% to 90% of them arrive with the remaining 6 to 10 books arriving a day or two later. I predicted they would all arrive 10 days after I shipped them on 1/2/2021. That gives me until Tuesday evening for the last one to arrive. It will be close but I think my chances are better than 50/50 that they will all arrive by then. If I focused on all the things that could go wrong including, as you suggested the USPS being unable to process the deliveries, I never would have called Peter Keller in the first place. I do not know whether the USPS will be able to deliver every book exactly when they say they will after having so many of their sorting machines destroyed this summer to intentionally slow down the mail. From what I can tell so far I would say they are doing an excellent job delivering the least important, lowest class media mail books, I entrusted to them. I don't know about you but I am very impressed with the job the United States Postal System is doing delivering Peter's books to you everywhere in the United States. Dennis Tillman W7pF -----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Gordon Smith Sent: Friday, January 08, 2021 5:37 PM To: [email protected] Subject: Re: [TekScopes] Update on Domestic US Book Delivery Dates On Fri, Jan 8, 2021 at 02:45 PM, Dennis Tillman W7pF wrote: Hi Dennis, My apologies, but I would take any estimated delivery dates by the Post Office with a grain of salt. Because of changes made to the US Postal service over the last year, mail delivery is lagging massively. It is so bad that I personally know of Priority mail items that were mailed 2 weeks before Christmas and some are just now getting to their recipients. I ordered two aluminum roll up shade aluminum tubes last week and the business flat out stated that they would NOT ship via USPS because of delivery issues. YMMV but just thought I would give a warning. Thank You, Gordon -- Dennis Tillman W7pF TekScopes Moderator |
Re: [dead tek 485] Can i fix it ? (newbie here)
Tom,
I've been reading everything that I could find about the 485 since this discussion started, and the one thing that I can't find is any mention of what probe would have been standard with the scope. The 485 was released the same year as the 475 (with which I am quite familiar). The 475 would have shipped with P6075 probes (or maybe P6063 probes? My father's scope, which he started using in 1975, was shipped with P6075A probes). The manuals for the 475 clearly list what kind of probe would have been standard equipment with (and, apparently, were specifically designed for) the scope. Depending on which manual you look at the 475 manuals list either the P6075 or the P6106, but I haven't found any such listing in the 485's manual. I've been using cheap Chinese 200 MHz probes to test my new (to me) 2465, and the effects of the probes' bandwidth are evident. What probes would have been used on a new 485 in the early to mid seventies? -- Jeff Dutky |
Tracking your Peter Keller book (and anything else) Internationally
This web application called Package Radar may be helpful in tracking your
book. This is the specific web page to track a USPS (US Postal Service) shipment: Package Radar has 230 other worldwide carriers they track. You may find a few of them useful as well. The complete list of 230 carriers they track is here: Dennis Tillman W7pF |
Re: Tek 2712 GPIB board
One way to check is use a terminal program to connect to the prologix controller and try talking to the 2712. Sending the command ?ID should give you the model number and a bunch of other info.
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Vince. On 01/10/2021 03:02 PM, Howard Hoyt wrote:
Hi! --
K8ZW |
Tek 2712 GPIB board
Hi!
Does anyone have a spare 2712 GPIB board available? I am using a Prologic GPIB to USB converter, and the setup had been working great for a few years. Abruptly it ceased communicating, so I tried a spare Prologic converter, but that did not fix the issue. At that point I assumed a power issue with chassis differential (power spike?) between the PC and 2713 was the culprit. I replaced the two GPIB interface ICs U170 and U370 as well as the dead battery, but I still cannot plot through it. When Plot is pressed I get a No Listener message, even though the PC sees the Proligic, and I know it is good, so I suspect some other GPIB board issue. I tried ordering a TMS9914A GPIB IC, but the only version available is a really small SMD (I forget the case outline style) which is not pin-for-pin compatible with the much larger one on my board and I don't have time to make an adapter PCB....if that is even the problem I hope someone has a spare board #671-1859-01 to sell? Thank you for the bandwidth, Howard Hoyt |
Re: [dead tek 485] Can i fix it ? (newbie here)
Hi Gary,
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Jim was very good about citing references. His remarkable AN-47 (how many 132-page app notes do you run across?), where he debuted his pulser, cites the Tek 111 pre-trigger pulse gen as an inspiration. Unfortunately, he sort of misapplies the rise time-bandwidth relationship in the notes, leading readers to think that they could infer bandwidth from a narrow pulse's rise time using the same formula as for a step. I'm sure that the application for which you built your avalanchers at GE had, er, other purposes. -- Cheers, Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way Stanford University Stanford, CA 94305-4070 On 1/10/2021 16:45, shalopt via groups.io wrote:
Don't known where Jim got the idea for the pulser but in 1962 |
Re: [dead tek 485] Can i fix it ? (newbie here)
Don't known where Jim got the idea for the pulser but in 1962
I built this circuit with the delay line as an engineering technician. While at GE Comm Products Lynchburg, Va Military Engineering Dept long forgotten why we were doing this. We where not testing "o" scope. Gary G |
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