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Tunnel and sampling diodes
Hi Craig:
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The 1502 and 1503 Metallic Cable Testers (not the "B" and "C" versions) use a tunnel diode as a pulse generator and another for jitter reduction. Schematic ref CR1609 is the jitter reduction Tunnel: 152-0140-01 Tunnel Diode 8 pF, 10 ma mfr 03508 p/n SMTD995 Schematic reference CR1703 is the pulse generator Tunnel: 152-0489-00 Tunnel GE 21 ma, 1.5 pF, w/gnd, mfr 80009, p/n 152-0631-00 (i.e. made to a Tek drawing). I used to work for microwave related companies and worked mostly with Tunnel and other diode types, see: While at Metelics () we supplied Tek with Step Recovery Diodes which were used in the sampling heads. Also might have supplied beam lead Schottky diodes in a bridge configuration (different from a mixer ring configuration) which were driven by the SRD. While at Aertech (long gone) we made tunnel diodes. I does not require a clean room and is a more or less mechanical process, i.e. no wafers, no masks and can be done in a garage. Have Fun, Brooke Clarke, N6GCE Date: Mon, 15 Mar 2004 08:57:14 -0000 From: "Craig Sawyers" <c.sawyers@...> |
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Re: Tunnel and sampling diodes
Craig Sawyers
I've found a selected TD3A 4.7ma Tunnel diode in the 3T4Thanks Andr??? The list is filling up - so far 18 different TD's, and I've found specificiations for 15 of those. The unit that has the most unique ones is the 1S2, and they are for the 50ps pulse generator. The most common one is the TD3A, for which I don't have a specification. But the TD3 is equivalent to the 1N3716, and the key parameter is the capacitance (which determines the speed). This is 50pF for the 1N3716. Now adding an A or a B in front of the device type usually seems to mean a reduced capacitance (TD253 is 9pF, TD253B is 4pF. TD252 is 6pF, TD252A is 1pF) - so I'll guess that the TD3A is around 8pF, or maybe lower. I suspect that diodes of the same type were all made in the same batch and then graded. There was a crucial etching step in the fabrication of TD's which left a mushroom of semiconductor sticking out the surface, with a tiny junction where the thin stem contacted the surface (see for example , although that is a truly tiny specimen for single-electron tunnelling studies). So I think that changes in processing from one batch to the next gave thinner mushroom stem and lower capacitance. I've actually got some TD3A's - and I also have an HP 250B R-X meter (which GE used to use to measure TD capacitance), so when I get a spare moment I could measure one. Cheers Craig |
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577/D1 curve tracer common faults
Hi all,
I am considering acquiring a 577/D1 curve tracer with a 177 fixture that was "rejected" by a cal lab. Studying the specs, it seems much more versatile than the 71CTN that I was previously interested in. 100 watts available vs 1/2 watt for the 71CTN. Are there common (unfixable) problems that plague the 577/D1 that would make it a poor gamble? Problems with the power transformer, CRT, or unavailable hybrids, etc. Is the 577 a decent instrument? I've never owned a curve tracer, and I think it would be useful for matching transistors for audio preamps and amps. Thanks, Steve Hogan |
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Re: Tunnel and sampling diodes
andre
hi Craig,
I've found a selected TD3A 4.7ma Tunnel diode in the 3T4 programmable sampling sweep plug-in unit. Anyway, it seems to be TD's in 3B3, 3B1 and 3B4 time base. for the 3B3 : 152-081 is TD2 2.2mA 152-093 is TD3 4.7mA for the 3B4 : 152-125 is selected TD3A 4.7mA and for the 3B1, I don't know what type it is 'cause I've no manual, but there are at least 2 tunnel diodes, I see both of them !!! Hope it's usefull for your search. Have a nice day. 础苍诲谤é [Non-text portions of this message have been removed] |
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Tunnel and sampling diodes
Craig Sawyers
Hi all
Just because I'm curious, I'm trying to put together a list of the tunnel and sampling diodes that Tek used in what instrument, and as far as possible what their specifications are. I'm making reasonable progress, but I'm missing details of what is in a number of instruments that clearly use them. The ones that I have already done are: 1S1, 1S2, 7T11, 3T2, 3T6, 3T77, 485, 7B92A (early), 434, 435, 456, 464B, 475A, 184, 555, 547, 556, 453, 544, 454, And the ones that I have identified that I *don't* have are: 5T1, 3T3. (but there may be more) Also, Stan has identified a whole list of others that use a 4.7mA diode (152-0125-00) he supplies: 1L40, 11B1, 11B2, 11B2A, 147A, 1470, 148, 21A (new style 555 Timebase), 22A, 408, 432, 453A, 466, 491, 5T3, 546, 7B70, 7B71, 7D11 but these probably include tunnel diodes in addition to 152-0125-00. The other thing I'm trying to do is put together a list of sampling and snap off (or step recovery) diodes that are used. I've done the following: 1S1, 1S2, 3S1, 3S76, S1, S2, S3/S3A, S4, S5, S6, 7S14 The ones that I know are missing are: 4S1, 4S2, 4S3, 3S5, 3S7 (again, there may be more). Practically, what I hope to get out of this is (a) a cross reference of what TD's are used in what instrument, so that a rare instrument can be resurrected by use of a more common donor and (b) practical suggestions about what diodes can be used if a sampling bridge or snap-off diode is zapped. So if anyone out there has some of the manuals that contain the data needed, I'd really appreciate you having a poke around and sending me the data. Once complete, I'll either post it to our yahoo site, or my own (or both). Cheers Craig |
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Tek 547 Parts Available
Dan
A few weeks ago I posted a message looking for anyone interested in
three Tek 547's that I had. I have found "good" homes for two of these and the third unit has been a sucessful part source. If anyone is interested in parts from this unit I could ship them to you for a fair price plus shipping. This unit does not have any of the socketed tubes or transistors remaining, so what's left is either items that are soldered in place, the CRT, or mechanical components. This unit powered up and created a trace on one of the timebases. Thanks again for all the help in searching for parts for my 464 scope. I haven't found a service manual yet and some replacement knobs, but I found some good contacts! Dan Szubra |
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P6046
Gentlemen-
I scored a nice, clean P6046 at a ham swap yesterday that works perfectly however, no accessories were included. Does anyone have replacement probe tips or the X10 attenuator that goes with this probe? I would really like to complete the package and the attenuator provides some needed protection for the probe input. Thanks in advance for your response, Phil. |
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FTP Site Update
Hi, gang,
With thanks (again) to Fred de Vries, the following additional file(s) are now available on the Blue Feather FTP archive at ftp.bluefeathertech.com. File name: 2465CTS.zip Path: /pub/electronics/testgear/Tektronix/firmware Version: Unknown As always, please keep the following restrictions in mind when accessing the archive: (1), There is a five-user limit for anonymous logins at any one time. (2), Download speed is capped at 128Kbps. Both of these limits are designed to maximize availability of the archive for all, taking into account the limits of my DSL pipe. Regrettably, I cannot yet afford a T1 or F-T1 line. Access to the archive is best made with a real FTP client program as opposed to a web browser. This is because transfers made through a web browser are often slower, due to translation between the HTTP and FTP protocols. There are plenty of freeware and low-cost shareware FTP clients available. My personal favorite is WS_FTP, by IPSwitch Software, widely available from download sites all over the planet (including Tucows.com and ftpplanet.com). When logging in, be sure to specify 'anonymous' (spelled out, no quotes) as your user ID. Your E-mail address is preferred as the password, but it is not a requirement (really, just about anything that contains printable ASCII characters will work). CONTRIBUTIONS: Further contributions to the archive are always welcome, subject to the following conditions. (1) Whatever you submit must be firmware or software that is NO LONGER SUPPORTED OR SOLD by Tektronix, or it must be directly related to equipment that is no longer supported or sold. Firmware or software relating to CURRENT Tektronix equipment WILL NOT be posted for download unless Tektronix makes the same file(s) publicly available from their own site. (2) Contributions should be sent via E-mail attachment to 'kyrrin at bluefeathertech dot com,' and should be archived with any of the common compression utilities, such as Power Archiver, WinZip, Gzip, etc. (3) The preferred format for EPROM or EEPROM image files is Absolute Binary (Data I/O #16). This helps to guarantee compatibility with the widest possible range of device programmers. HOWEVER -- Other formats, such as Intel Hex or Motorola S-record, may be submitted with a note indicating the format used. (4) The preferred format for PAL or PLD image files is a standard JEDEC fuse map. Thanks to all for your contributions and interest. -=-=-=-=-=-=-=-=-=-=-=- Bruce Lane, Owner & Head Hardware Heavy, Blue Feather Technologies -- kyrrin (at) bluefeathertech do/t c=o=m "If Salvador Dali had owned a computer, would it have been equipped with surreal ports?" |
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Re: Undecided 465M
Darrin,
I find a lot of bad power cords in the older scopes (453s) due to age and maybe some abuse - pulling plug out by the cord, sharp bends, etc. Use an ohm meter to check continuity of the cord from the blades in the plug (switch on/off). Should be probably about 5 to 10 ohms (judging from older scopes.) Wiggle the cord around the plug and along its length, watching for the ohm meter to jump around. And, while you are at it, check the continuity of the grounding wire from plug to chassis. That is the first to go. More than half the 453 and 454 scopes I've checked had an open or intermittant ground. Check for loose fuses, or fuses with corroded terminals. Since the LED probably runs off one of the DC supplies, that would be the next thing to check. I don't have a schematic for the 465, so I cannot help there. Check if all low power supplies go off at the same time. (Hopefully someone can give you specific test points.) Good luck, -Howard --- In TekScopes@..., Darrin Conniff <djconniff@s...> wrote: Grettings All!off. It powers up fine (with a crispy trace!), then the power LED blinks with no kind of timing at all. As this is happening, the trace restarts from the left. I don't have the manual for this model yet. Any and allsuggestions will be welcome. Thanks in advance. |
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Re: Enhanced accuracy DSA 602 ?
Denis Cobley
Hi Peter
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The DSA circuits were never published (like 99% of the TDS scopes and most products built in the last 10 years.) The failure is in the mainframe (plug in none - means no failures for the plug ins). The manual suggests any of the following modules could be at fault. Sweep Controller U530 on Upper Acquisition board (A7) or Calibrator board (A5). These are not available from Tek and most of the critical IC/hybrids are Tek custom parts. I think the only effect would be to the timebase accuracy or the skew between channels (identical edges may not line up exactly between channels). You are right about the scope - this is the peak of Teks brilliance in building the best scopes. Huge range of capabilities and the most accurate scope they have ever made. We love ours and it's the primary "Standard" scope for us. We have a full set of 11A72's x 3, 11A33, 11A34, 11A32, the rigid extender, flexible extender and 3 x 7K standardisers modified for 11K use 067-0587-10's instead of -02"s. It's a lab scope with no compromises and was a worthy successor to the best 7K scopes - pity that customers never took to it like the 7K - in the end that was the downfall of the whole 11K,DSA,CSA range. Regards Denis Cobley www.newteksupport.com ----- Original Message -----
From: "Peter van Daalen" <reteb@...> To: <TekScopes@...> Sent: Friday, March 12, 2004 1:12 PM Subject: [TekScopes] Enhanced accuracy DSA 602 ? I have been testing my DSA 602 ( 6 of 12 channels, 4 x 400 Mhz, 2 x 1Ghz ) with Option C04 ( > 1 MBy total non volatile RAM ) for a few days now. This beast is really the most stunning scope I ever saw.and Programmers Ref. I asked Dave DiGiacomo for his price quotation.this error : accuracies ? ) is decreased until 3% vertical instead of the enhanced > 1% vertical or is this error prompt more threatening than that ? and FFT phase, power, all waveform functions, storing/recalling, scanning the memory etc. etc. and all tests seem to succeed. for my DSA 602 the measurement and other displayed results ? Does the enhanced accuracy test require a probe connected to the inputconnectors ? ( I have no active TEK probes as yet ). failing " main pulse width " ? Any suggestion where and what to check, repair or replace ( if not a *&^%TEK custom part ) ? Has someone DSA 602 parts available or a complete defective 602 ? |
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Enhanced accuracy DSA 602 ?
Peter van Daalen
I have been testing my DSA 602 ( 6 of 12 channels, 4 x 400 Mhz, 2 x 1 Ghz ) with Option C04 ( > 1 MBy total non volatile RAM ) for a few days now.
This beast is really the most stunning scope I ever saw. This is no scope, this is measurement laboratory :-) Up to now I only use the Tutorial and the User Ref. I still consider where to order the Service Ref + Schematics , Command Ref and Programmers Ref. I asked Dave DiGiacomo for his price quotation. I guess this is a good move ? Lacking the Service Manuals as yet, I wonder what is the consequence of this error : " partial enhanced accuracy failed , main pulse width ; plugin none ". Is the meaning of this only that the ( enhanced ) accuracy ( btw which accuracies ? ) is decreased until 3% vertical instead of the enhanced > 1% vertical or is this error prompt more threatening than that ? I did many tens of tests ( all triggering functions, amplitude, FFT freq and FFT phase, power, all waveform functions, storing/recalling, scanning the memory etc. etc. and all tests seem to succeed. I just can't judge accurately the accuracy of the measurent function. I use 12 other scopes and spectrum analyzers but no one can be a reference for my DSA 602 How far does the failing enhanced calibrating accuracy selftest disqualify the measurement and other displayed results ? Does the enhanced accuracy test require a probe connected to the input connectors ? ( I have no active TEK probes as yet ). Where in the schematics ( after I got them ) should I search for the failing " main pulse width " ? Any suggestion where and what to check, repair or replace ( if not a *&^% TEK custom part ) ? Has someone DSA 602 parts available or a complete defective 602 ? Thanks for response. Peter van Daalen. |
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Undecided 465M
Darrin Conniff
Grettings All!
I have a 465M that just cannot decide whether it wants to be on or off. It powers up fine (with a crispy trace!), then the power LED blinks with no kind of timing at all. As this is happening, the trace restarts from the left. I don't have the manual for this model yet. Any and all suggestions will be welcome. Thanks in advance. Darrin |
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211 Batt Powered Scope Question
Marvin Ross
Tektronics CRT V300 Pn: 154-0642-00
Any suggestions with testing the CRT? The problem that I can see is a circuit by the name of the " Grid Bias Circuit". It supplies the voltage to the CRT grid and is acting very erratically. One minute it has voltage and the next, the voltage bleeds down to 0V. |
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Help with a 7L12 problem
Michael Goode - one of many
Is there someone here that can help me with a 7L12 that has suddenly lost sensitivity by about 50 dB? The problem seemed erratic
at first. A couple times when I first turned it on it worked OKat first then lost sensitivityafter a few minutes. At least one of these times it was really intermittant for a minute or two before going out - I could wiggle the input connector and make the signal level jump up and down. Now the problem is perminant no matter what, I have examined the connectors and cables inside the unit but can find nothing that causes the intermittant. I don't think the first mixer was blown, I am very careful about that and was looking at a source I often look at when the 7L12 first died. Any help? Mike in Indy |
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Sticky Buttons
jdpetrzelka
Working on a DM5010 multimeter it has a bunch of little square button
switches on the front panel, a few are sticky, should I try and clean them or lubricate them ? And how with what ? I have it completely apart they don't apear dirty, they are plastic, I beleive the same are used on some later scopes. Thanks in advance for any wisdom on this subject, Jon P. |
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Re: (DC) Current Probes
Gentlemen-Is this really an all-male list? Bummer. I've acquired an AM503 and am looking for a compatible current probe (DCExcerpt from my list @ : Tektronix A6302 DC current probe 50MHz 20A Tektronix A6302XL DC current probe 17MHz 20A Tektronix A6303 DC current probe 15MHz 100A Tektronix A6303XL DC current probe 10MHz 100A Tektronix A6304XL DC current probe 2MHz 500A Tektronix A6312 DC current probe 100MHz 20A I think the XL models may require an AM503B/AM5030 amp, but I'm not sure. David DiGiacomo San Francisco, CA |
Bruce Lane
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