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Re: More stuff found For sale, 7000 series on cart and 7834, many modules
devin davison
Hello again. Spent some time here taking inventory, Here is a partial
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listing of the plug in modules that I have Availible. The is some more in storage, once i get over there I will update the listing. I also uploaded some more images to the image gallery of what I have in stock. Mram tektronics equipment listing 7B53A Dual time base Quantity x9 7A18 Dual trace ampl Quantity x12 5A48 Dual prace ampl Quantity X1 7A26 Dual trace ampl Quantity x13 7A15A Aplifier Quantity x1 7A19 Aplifier Quantity x9 7S11 Sampling unit Quantity x9 7S12 TDR/Sampler Quantity x1 7A16A Aplifier Quantity x3 7B92 Dual time base Quantity x1 AM503 Current probe ampl Quantity x1 Am-6565 Amplifier Quantity X3 7B71 Delaying time base Quantity X1 7A13 Differential Comparator Quantity X2 7A11 Aplifier Quantity X3 7A29 Aplifier Quantity X2 7B85 Delaying time base Quantity X3 7B10 Time baase Quantity X1 7B15 Time Base Quantity X2 7B80 Time Base Quantity X2 7B87 TB with pretrigger clock Quantity X2 TD1085/U Dual Time Base Quantity X1 7A18A Dual trace ampl Quantity X6 7A24 Dual trace ampl Quantity X4 DL2 Digital latch Quantity X1 7D01 Logic Analizer Quantity X1 5B10N Time B/ampl Quantity X1 DF2 Display formatter Quantity X1 7M13 Readout UNit Quantity X1 ZS11 sampling unit Quantity X1 7D15 225MHZ counter/timer Quantity X2 7834 Storage oscilloscope with 7A26 plug in T922 Dual trace Scope 15 MHZ - working If you have interest in any of this, please let me know. --Devin D. On Tue, Dec 11, 2018 at 4:29 PM devin davison <lyokoboy0@...> wrote:
Greetings. I hope that these listings are not bothering anyone, I am |
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Re: Calibration Fixture Question
Used to live in greater Boston as well, gotta be dozens of 7000 CAL fixtures in captivity up there. Probably the second largest population of geeks outside of silicon valley
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Dave manuals@... On 12/13/2018 10:31 AM, David Berlind wrote:
Hi Dave... thanks so much for thinking of that offer. My Florida days --
Dave Manuals@... www.ArtekManuals.com |
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WTB: W1 wire assembly for 7L12 (175-1317-00)
I finally found out what is causing all my errorneous readings on my 7L12: the W1 assembly (PN 175-1317-00) has an intermittent contact; now where to find a replacement? I draw a blank at Qservice and Sphere...
I'm in the Netherlands, so 'local' sourcing is preferred due to shipping costs. For the measurements at hand (200MHz max) I can probably get away with just looping in an SMA cable to the input attenuator, but I'd like to get a more permanent fix that is usable to 2GHz... Any thoughts or hints to a solution? It looks like I can delve W1 out without following the complete procedure for the differential attenuator, but any tips for this task would be welcome... |
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Re: Calibration Fixture Question
Hi Dave... thanks so much for thinking of that offer. My Florida days
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(Miami) are over. I'm in the greater Boston area now. On Thu, Dec 13, 2018 at 9:10 AM Artekmedia <manuals@...> wrote:
David |
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Re: S-2 sampling head fault symptoms
On Thu, Dec 13, 2018 at 06:40 AM, Roger Evans wrote:
The first S-2, where you replaced the electrolytic, sounds like the samplingThank you, that's helpful. I shall look at the strobe pulses and see what I can see. I'm in the process of cobbling together a sampling head extender (another of my pastimes, vintage arcade machines, results in a ready supply of 0.156" edge connectors of both genders!) With your second S-2, seeing a signal amplitude which is too large is often aI tried two input signals: the TDR pulse from my SD-24, which does have an overshoot on the falling edge, and the square-wave output from my Thandar TG105 pulse generator which doesn't have significant overshoot. The S-2 definitely creates an overshoot where there shouldn't be one. Chris |
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Re: Seco 250 Transistor & Tunnel Diode Tester
Sencore is basically out of the test equipment business. Haven't checked lately but looked like they changed their business model to Studio Audio Equipment
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Try asking/moving this thread over on the manuals_exchange group or Glen Urbin's new group "Everything else" I forget now the exact name. Glenn will I am sure pipe up Dave manuals@... On 12/13/2018 9:11 AM, bobkrassa wrote:
It's possible, but Seco Electronics was located in Minneapolis while Sencore is still in Sioux Falls, S. Dakota. I believe they were in business at the same time. There was/is also a Seco Manufacturing in California that provided some products to amateur radio in the 1960s. Sencore was acquired by a Chinese company in 2015 according to Wikipedia. --
Dave Manuals@... www.ArtekManuals.com |
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Re: S-2 sampling head fault symptoms
Chris,
The first S-2, where you replaced the electrolytic, sounds like the sampling diodes are very slow to turn off after the sampling pulse. The preamplifier in the sampling head is acting as an integrator because of its rather slow response time so if the avalanche pulse comes before the rising edge of your signal, the sampling gate opens before the signal rises but stays (maybe partly) open for some time, and there is a signal out of the preamplifier which gets displayed as if it had occurred at the earlier time. You could check the snap off circuitry in case something around Q55 has failed but I doubt that can account for such a long turn off time. The large offset of the signal is consistent with the diodes being out of balance. With your second S-2, seeing a signal amplitude which is too large is often a sign of diode failure. Apart from that your comments about overshoot dependent on scan speed are consistent with a loop gain below unity in the preamp and a signal which really does have overshoot. I guess you have a good idea what the input signal really looks like. Roger |
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Re: Seco 250 Transistor & Tunnel Diode Tester
It's possible, but Seco Electronics was located in Minneapolis while Sencore is still in Sioux Falls, S. Dakota. I believe they were in business at the same time. There was/is also a Seco Manufacturing in California that provided some products to amateur radio in the 1960s. Sencore was acquired by a Chinese company in 2015 according to Wikipedia.
I have a couple of excellent Sencore products , and spoke with their parts department a number of years ago. It sounded like they were phasing out support of "legacy" products at that time. I will try them again. Bob Krassa AC0JL |
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Re: Calibration Fixture Question
David
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Where are you located? If your in the greater Tampa, FL area (long shot) for example I might be willing to come over and loan you mine for an afternoon. Located elsewhere you may receive similar offers. If your like most of us you need the CAL plug-in maybe once every 5 years. (If that), 99.9% of the time it sits in the cabinet. Better that they get passed around in a local community IMO, besides it fosters face to face relationships that are often lost in this day of electronic communications Dave manuals@... On 12/13/2018 8:54 AM, David Berlind wrote:
Hi all,... --
Dave Manuals@... www.ArtekManuals.com |
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Re: Calibration Fixture Question
The differences between the 067-0587-xx standardizer plug-ins for the 7000-series 'scopes are primarily bandwidth. IIRC, the -00 has a bandwidth of 250 MHz, the -01 500 MHz and the -02 1 GHz. There may be other differences - check the TekWiki site or any other website (K04BB, BarryTech, etc.) that spells out the specs of each.
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They won't be useful for calibrating non-7xxx 'scopes. I don't know what the bandwidth of the 067-0508 is, but you can download the manual from the TekWiki site. DaveD On 12/13/2018 8:54 AM, David Berlind wrote:
Hi all,... |
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Calibration Fixture Question
Hi all,...
I have 5 Tek scopes... 3 7603s, a 2220, and a 466. Earlier this year, I missed out on a good deal for a calibration plug-in and so I'm still looking for one at reasonable price. eBay's got a couple of expensive ones but the one I missed out on was about $100. I was looking for input on this...and have a couple of questions: 1. Would this external fixture be a reasonable solution for me: 2. I've been keeping my eye out for a 067-0587-01 plug-in, or a 067-0587-02 am a curious to hear opinions on why choose one over the other. 3. With the calibration plug in (vs external fixture) in the 7603, can I use it to calibrate external scopes (other than the 7603 that it's mounted to)? Thank you! |
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S-2 sampling head fault symptoms
I've searched the archives, which revealed lots of useful information, but I'd like to get a better understanding of the likely fault symptoms when sampling heads go bad.
I have two S-2 heads here, and I fear I may have killed one of them. The first one, s/n B084970, had a short-circuit 3.3uF tantalum capacitor in, which I replaced with a 10uF 25V ceramic. It now works but shows overshoot for about 500ns after the edges of a square wave. Intriguingly it also shows overshoot *before* the edge of the square wave (this is in equivalent-time sampling mode in a 7T11/7S11). Either it contains a time machine or there's something funny going on with the sampling pulse getting in to the signal. The second one, s/n B030787 has 'risetime <=50ps' on the front so it's obviously an early example. When I first tried it, I got just noise, then on the second try I got a good waveform but with bursts of noise every few seconds. While wiggling things to try and see if a bad contact was the source of the noise, the sampling head came out of its socket and I stupidly pushed it straight back in. Now it shows a significant offset (turning the 7S11's offset control all the way to the right just about brings the trace on screen). It does still show a signal, but with the following features: - there's a big disturbance for the first division or so of the trace, regardless of the setting of the time position on the 7T11 or the scan (this is still in equivalent-time mode) - the waveform is about twice as large in amplitude as it should be, and shows overshoot which depends on the scan rate. At slow scan rates there's no overshoot, but it gets progressively worse at faster rates. - there are still big bursts of noise every few seconds I looked inside the second sampling head and it doesn't have a plastic carrier for the sampling diodes. They're soldered in, so presumably are making good contact. My 7T11/7S11 seem to be fairly healthy (see separate thread) giving what seem to be reasonable results with an S-1 head. Any clues as to how to go ahead with diagnosing the faults would be very much appreciated. Chris |
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Re: 7T11 horizontal memory
On Thu, Dec 6, 2018 at 02:56 AM, Albert Otten wrote:
On Wed, Dec 5, 2018 at 10:19 PM, cmjones01 wrote:I've been back in the office today and have done some more experiments. I have no known-good sampling heads, only one S-1 and two S-2s bought very cheap and in unknown condition.- in real time mode, it's hard to get a trace that makes sense. presumablythe50kHz-ish clock from the real time multivibrator limits the display to aboutthe The risetime thing is interesting. If I use the 7T11 in real-time mode with my S-1 head, the risetime is about 100us. However, in equivalent-time mode, I can quite easily see the 350ps risetime of the head and the waveform looks accurate. With my least-broken S-2 head, the risetime in real-time mode is definitely faster than with the S-1. But the waveform as seem through the S-2 is definitely not accurate, though in equivalent-time mode the its risetime is fast (definitely better than 100ps). I'll start a separate thread about sampling head fault symptoms. Chris |
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Re: More stuff found For sale, 7000 series on cart and 7834, many modules
What Re you asking for the 7834, do you have a 7844 and 7104 ????
On Wed, Dec 12, 2018 at 5:46 PM, devin davison<lyokoboy0@...> wrote: Greetings. I hope that these listings are not bothering anyone, I am overstocked on this stuff and trying to find it a good home. I found another scope on a cart in storage, a 7000 series. It powers up but i am unable to get a trace. I also have a 7834, although i havent gotten arount to testing that one out. Also, a metric ton of 7000 series modules. Many of them are too high up on the shelf for me to see the module numbers at the moment, i need to take time to take inventory and list them all out here. I am open to offers on any of this equipment. Again, it is all located in Melbourne Fl, and i would be happy to ship if needed. --Devin D. |
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Re: Seco 250 Transistor & Tunnel Diode Tester
I've heard that Seco changed their name to Sencore.
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Michael A. Terrell -----Original Message-----
From: bobkrassa <bob@...> |
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Seco 250 Transistor & Tunnel Diode Tester
I have recently acquired one of these and am looking for a copy of the manual, "Operating Instructions Seco Model 250 Transistor & Tunnel Diode Analyzer." Not off topic as I hope that it may turn out to be a quick way to check the current inflection point of tunnel diodes in Tek equipment in-circuit, without mobilizing the 575.
If anyone has the manual, I would very much appreciate a scan including the schematic. I believe I checked the websites of all of the regular manual providers, but if one of them can provide this I would be glad to purchase a copy. My direct e-mail is bob at krassa.com for any messages that would not be of interest to the group. However, if anyone has any experience using this unit, please tell us about it! 73s Bob Krassa AC?JL |
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Model 2246
sid_saul
Hello, New member with limited scope background. I aquired this model 2246 a few months ago. The good folks at the Vintage Tech Museum fixed my triggering problem, but now something new. I cant us my cursors for both time and amplitude. Get the "Time Self Cal Failed". Also Search "Returned Bad Value at 5 us" warning. The message "Outch turn volts/div CCW turned up early on, without remedy. Tried all the service menu routines to no avail. I even replaced the backup battery without a change. Is there a routine that I might try before another visit to the museum?
This is my first data readout model. I have been using the 545B and the 2215 before now. Enjoying the discussions, and appreciate the assistance and learning experience. Sid Saul Hebo, OR |
Jeff Urban
Michael A. Terrell
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