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Re: Looking for fasteners in EU
You might ask this in the model engineering group in groups.io or the
miniature machine tools group also on groups.io. Some of these folks make operational miniature milling machines and those must have a lead screw longer than 20mm (but likely also larger diameter than 1.4 or 1.6mm). When you see what some of these folks do, cutting an M1.4 x 20+mm screw does not seem unreasonable. They might also tell you to try M1.4 and M1.6 dies and thread what you need though I suspect the torque on the stock might be a problem. Steve H. On Tue, Nov 2, 2021 at 6:02 AM cheater cheater <cheater00social@...> wrote: You linked to the black one which only goes up to 16mm. It doesn't |
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Re: Beginning Oscilloscope User
I have a small collection of books on how to use the oscilloscope. Some of them are pretty old, and may not be entirely applicable to your comparatively modern analog scope, but here's the list:
Oscilloscope Techniques by Alfred Haas (first printing 1958, my edition is from 1968) Know Your Oscilloscope, 4th Ed. by Paul Smith (first printing 1958, 4th Ed. from 1963) Troubleshooting with the Oscilloscope by Robert Middleton (1962) Oscilloscopes by Stan Prentiss (1981) Oscilloscopes: How to use them, how they work, 5th Ed. by Ian Hickman (first published in 1981, 5th Ed. from 2001) Oscilloscopes: A Manual for Students, Engineers, and Scientists by David Herres (2020) and, of course, the canonical primer from Tektronix: XYZs of Oscilloscopes (many editions over at least 20 years) All of these can be found on-line as PDFs. Some can be obtained in physical form from Amazon or eBay. -- Jeff Dutky |
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Re: Beginning Oscilloscope User
On Tue, Nov 2, 2021 at 05:50 PM, JohnEdward wrote:
Hi John: Here is a pseudo-bibliography given according to, Author (date) Title (Publisher) Haas(1958) Oscilloscope Techniques (Tab Books) Middleton (1962) Troubleshooting With the Oscilloscope (Sams) Saunders (1968) 99 Ways to use your Oscilloscope (Foulsham-Tab) Smith (1963) Know Your Oscilloscope (Sams) Weber (1969) Oscilloscope Probe Circuits (Tektronix, Circuit Concepts) Hickman (2000) Oscilloscopes. How to use them, how they work (Elsevier) Czech(1965)Oscilloscope Measuring Technique: Principles and Applications of Modern Cathode Ray Oscilloscopes (Springer) LeCroy () Oscilloscope Fundamentals ¨C Probes and Probing (LeCroy Corporation) Books published by Sams, or Tab, are recommended for beginners with old (say 1960s/1970s) oscilloscopes. They turn up on Amazon book sellers for very little, or at Ham Fests too. Sometimes they are in public libraries. Tektronix Circuit Concepts books are good if you already know what you are doing, and want to learn more, by thinking about what is discussed in them. You can download all of the series from TekWiki. Books by Springer or Elsevier are published for academa. Books like the one from LeCroy, and also from Tektronix .et al. are newer than the Tektronix Circuit Concepts ones... are usually free... and are an indication of what passes for a 'book' these days. Cheers, and all that. -- Roy Thistle |
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Re: Beginning Oscilloscope User
Go to the TekWIKI.
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Look for the Tek books series, which have been scanned. These were originally for sale for 3 or 4 dollars (IIRC), written by Tektronix, and showed how the insides of a lot of Tek scopes worked, as well as how to use the equipment. Here's the link: Harvey On 11/2/2021 8:50 PM, JohnEdward via groups.io wrote:
Richard |
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Re: Curve Tracer CRTs
I've actually made (a while ago) a video display with two memory planes using an FPGA.
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Computer interface to the FPGA would be by SPI, with a customizable array of 8 bit registers that are read/write. However, if? you can find someone who's made this already, I'd go for it.? Especially nice would be (even if you don't have a computer interface on the converter) the ability to mix two VGA signals, and drive one from a roll-your-own video generator chip, those are surprisingly easy once you work past the little idiot parts.... Depends, though on whether or not you're driving an LCD flat panel or just digitizing. I've got some experience making graphics chips drive flat panel displays.? In fact, with the right board, all you'd need would be the scaled inputs to a 12 bit a/d converter on the processor. Might take a bit to build up the display, though. Harvey On 11/2/2021 5:56 PM, SCMenasian wrote:
Harvey, |
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Re: Looking for fasteners in EU
Speaking of taking a hint, so far, you've found NO ONE that makes your ridiculous screw size. Have you considered they might not be made because they're not manufacturable? Have you looked at the aspect ratio? They don't even make partially threaded screws in that size. It's a good bet that your precious screws will be made in China by a "corner shop" anyhow. Even specialty shops stop at 10mm length. It's not being negative, this is an engineering forum, we look at facts. At least, we're supposed to. |
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Re: Curve Tracer CRTs
On Tue, Nov 2, 2021 at 07:41 PM, HSK3 wrote:
Your links don't seem to work, but I found the item that I think you are referring to by searching for "mcbazel arcade converter monitor" on Amazon (here is a shorter link that should work: ). Also, it does not look like this can convert from XYZ inputs. It only lists raster video formats (CGA/EGA/VGA and YUV component). Have you used this product to convert XYZ signals to raster video before? -- Jeff Dutky |
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Re: Curve Tracer CRTs
Hello All-
These XYZ to LCD (or VGA) converter boards exist for very little $$$, mainly targeted at the gaming market. See this example: (which produces VGA out) LBJ/ref=asc_df_B078ZDTLBJ/?tag=hyprod-20 < TLBJ/ref=asc_df_B078ZDTLBJ/?tag=hyprod-20&linkCode=df0&hvadid=459478253945&h vpos=&hvnetw=g&hvrand=14805566918582990857&hvpone=&hvptwo=&hvqmt=&hvdev=c&hv dvcmdl=&hvlocint=&hvlocphy=9030067&hvtargid=pla-422856440089&psc=1> &linkCode=df0&hvadid=459478253945&hvpos=&hvnetw=g&hvrand=1480556691858299085 7&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9030067&hvtarg id=pla-422856440089&psc=1 You should see how well this thing works... It is trivial to add the reticule lines and text to the output image. To get going, scale the low voltage scope XY signals and Z axis (as I recall to 0 to 5V) and merely connect same to this board's inputs. Obviously you can matrix the scope's signals to produce the color trace you want or even make the reticule a different color. Easy! Less money than a McDonald's meal for three. Good Luck- Howard Katz |
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Re: Beginning Oscilloscope User
Welcome!
Yes, get the instruction manual for your scope; the TekWIki has most manual for free download () see the "Manuals" list on the right hand side). Also see W2EAW's extensive and wonderful set of instructional videos about oscilloscopes () starting with "Scopes for Dopes" (). Aside from this excellent group, you can also go to the EEVblog forums () which are also very helpful. -- Jeff Dutky |
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Re: Curve Tracer CRTs
Harvey,
I agree that either approach could be viable. I just threw this idea out because it might stimulate some more thought on the project. My parts bin would support the DAC approch since I use high performance ADCsw sparingly. Also, I think the DAC approach would allow a much simpler computer interface and the opportunity to support many advanced downstream capabilities. such as the generation of datasheets individualized to a specific component, rather than a component type. Stephen |
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Re: Beginning Oscilloscope User
I am sure you will get lots of answers.
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?? A calibrated oscilloscope is probably the single most powerful measurement tool you can have. By? calibrated I mean that it indicates voltage and time (which can be translated to frequency). The earliest scopes were not calibrated or used some external means to measure voltage and time indirectly. They were still very useful. ?? First, obtain the instruction book for your scope and read it carefully. It will tell you what the controls are supposed to do. Secondly, there have been many books written on using oscilloscopes. The older ones may be useful to you because they are elementary and you need to understand the instrument from an elementary level. The 465B is a very good fairly high performance, scope. Once you begin to get an intuitive idea of what its seeing you will wonder how you ever lived without one. ?? Someone mentioned terminations; you many need terminations for certain measurements but you would need them also for a voltmeter. The scope is designed to indicate the voltage at the point of measurement, meaning the place the probe is connected. With the probes the input resistance of the scope is usually very high, meaning it will not change the voltage at that point by being connected. This is very basic. ?? I also suggest going over basic books on electronic measurement in general. ?? This is a very good scope and will do a lot of jobs for you. ?? Note that "alignment" covers a lot of territory. The scope does not provide test signals so you need something else for that but the scope will give you a good indication of the results of most adjustments. On 11/2/2021 11:43 AM, JohnEdward via groups.io wrote:
Hello and a new subscriber. --
Richard Knoppow dickburk@... WB6KBL |
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Re: 7B53A Schematic Question
Yes, G?ran is correct. A ferrite bead is most often used as a quick fix to quell parasitic ringing or oscillation. It introduces damping at high frequencies (where you want it), while leaving dc alone. A resistor would work similarly, but has the disadvantage of affecting dc as well.
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It is also less frequently used to boost inductance a bit to introduce some frequency peaking to extend bandwidth. Tek most likely didn't see a problem until enough units had been manufactured to discover a marginality. A ferrite bead is a very effective, quick-and-not-too-dirty band-aid. RF PAs, which are twitchy beasts on a good day, tend to use lots of them. -- Cheers, Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way Stanford University Stanford, CA 94305-4070 On 11/2/2021 05:51, n4buq wrote:
Okay - I see that in the parts list now. It isn't shown on the pictorial diagram and I don't see it on at least one of the boards I have either. It's listed as "NOMINAL, INSTALLED, TEST SELECTED" so, perhaps, it wasn't needed on all the boards. |
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Re: Beginning Oscilloscope User
Hi John and welcome,
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Sure there is a lot of places to start I will send you an off list E-Mail in a few. Some important info for RF work. The 465B does not have a 50 ohm input some terminators might be needed Rigol ones run about $19.00. Also the -3db bandwidth is 100 Mhz for the 465. Zen -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of JohnEdward via groups.io Sent: Tuesday, November 2, 2021 2:43 PM To: [email protected] Subject: [TekScopes] Beginning Oscilloscope User Hello and a new subscriber. I purchased a used very good condition Tektronix 465b with two rf probes and the manual. I wish to use it for amateur radios but I never used one and don't know the first thing about it, The front panel as you know has many switches, channels, etc and I do not know where to start. I wish to use it for aligning radios. I have read other publications on the use of the oscilloscope but nothing to get me in the right direction for what I wish to do. Can someone get me started on this? Thank you |
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Beginning Oscilloscope User
Hello and a new subscriber.
I purchased a used very good condition Tektronix 465b with two rf probes and the manual. I wish to use it for amateur radios but I never used one and don't know the first thing about it, The front panel as you know has many switches, channels, etc and I do not know where to start. I wish to use it for aligning radios. I have read other publications on the use of the oscilloscope but nothing to get me in the right direction for what I wish to do. Can someone get me started on this? Thank you |
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Re: Curve Tracer CRTs
True enough.? However, fancy stuff could be beta computation, storing it for comparison, perhaps some standardized tests, and then printing a data sheet.
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Still limited by the accuracy of the process, but making the CPU fill out the ledger book seems like it would eliminate some tedium. Note that digitizing the screen gives a level of accuracy based on the resolution of the flash ADCs.? If you could (or wanted to) go to a digital control of the voltages, then your accuracy improves since you can use DACs or ADCs with higher resolution. As I mentioned, more invasive, though. Might be a good exercise if you found one of the curve tracers that had been somewhat trashed that you didn't find economical to restore to original condition.? How much you could (or would want to) retain of the original electronics is another matter. Harvey On 11/2/2021 3:23 PM, Roy Thistle wrote:
On Tue, Nov 2, 2021 at 11:12 AM, Harvey White wrote:Do fancy stuff with the data.Hi Harvey: |
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Re: Curve Tracer CRTs
On Tue, Nov 2, 2021 at 11:12 AM, Harvey White wrote:
Hi Harvey: Yes... I think that's what some people have in mind for these old Tek curve tracers. But as an old prof intimidated me into believing... if "... fancy stuff with... data." entails smart stuff... your data is only as "smart" as the source it came from. Cheers... and all that. -- Roy Thistle |
JohnEdward
G?ran Krusell
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