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Re: Screwdriver for Pozidriv (Pozi) Screws used by Tek
开云体育Hi Paul, I have bought many of those “sets” over the years and never found a Pozi bit. They may be a recent addition to the sets as the manufacturers of these sets seem to be competing over how many new bits each can include that the others don’t have. The sets seem to grow more elaborate every year as each vendor tries to outdo the competition by adding more oddball bits to their sets. Dennis ? From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Paul Kraemer Pozidrive screwdriver tips are available in most DIY stores like Lowes, Home Depot, Menards, Harbor Freight etc.---if you know where to look for them. They are included in many of the multi bit sets, the ones that have assortment of phillips, square, torx, plain---all those. Phillips are marked P1etc and pozidrive are PZ1 etc. They are there, just hiding. Paul K0UYA
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Re: Screwdriver for Pozidriv (Pozi) Screws used by Tek
Yes. I meant hardware store in the USA. And Yes! I know about and respect
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that we are just one country among many nations around the world. I consider myself fortunate that I live in a unique place within a mile of Microsoft. Because they have brought in people from all over the world to help write their software and to internationalize it I am in a multicultural microcosm where I am sometimes the only American in the supermarket. It is fascinating to see so many different costumes and hear so many languages spoken in the aisles. That microcosm is situated in a myopic bubble world called the USA where most people take it for granted that they, and their country, are the only ones that matter. When they think "foreign country", if they think at all, what comes to mind is Canada and Mexico. Most of them don't realize, or don't care (which is worse!) the other 180+ countries even exist. Recently they have been rudely awakened to the ugly fact that just about everything they now wear, buy, and own is made in China. Americans have fought metrification for at least the past 50 years (since I was first introduced to its elegant simplicity in high school) kicking and screaming all the way. They prefer the comfort of teaspoons, tablespoons, ounces, cups, pints, quarts, gallons etc. when they cook. I defy anyone to tell me how many teaspoons are in a quart. To me it is mindboggling how confusing the English system is. I hold onto a glimmer of hope. While Americans were sleeping their quart soda bottles were replaced with 2 liter bottles. They don't seem to have noticed. Everything they buy in a liquor store comes measured in liters but as long as the bottles look the same size as what they are used to they don't realize they have been fooled into accepting those 'socialist' metric liters. What's worse, to accommodate their fear of metrification we are now mixing the systems together. For instance marijuana is smuggled in kilogram bundles ('keys') but they buy it by the ounce. Cocaine is bought by the gram. At least every hippie knows how many grams are in an ounce. American's cars come with metric bolts but the metric socket sets they use are designed to slip into their 1/4" ratchet drives. I gave up long ago advocating for the metric system in the US. It was always met with ignorance, closed minds, and worse, anger. Every time I still bring up the metric system I am reminded, painfully, that "half the people I know are below average". Sometimes I think most of the below average people live near me. Dennis PS No doubt I'm going to hear about this! -----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of fred Sent: Tuesday, October 16, 2012 12:54 AM To be specific. I think you mean, hardware store in the USA. There is a wild outside the US, we use strange things like metric instead of Inch, Celcius instead of Fahrenheit ect. And so there are many tools a " standard over here but as rare as metric in the US. In Holland and as far a I know a big part of Europe, you can buy them everywhere. Even sub 5 euro sets from food-supermarktets like Lidl or Aldi have them included. ( most times a screwdriver with exchangsble bits) i think I have somewhere around ( including bits) 20-30 pozidriv's. Almost all woodscrews here are pozidriv. Also most "parkers" , the selfcutting screws for use in metal. Bolts not with a hex wrench head are almost always Philips but in modern stuf more often torque or Hex. Fred --- In TekScopes@..., "Dennis Tillman" <dennis@...> wrote:
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Re: Screwdriver for Pozidriv (Pozi) Screws used by Tek
Paul Kraemer
开云体育Pozidrive screwdriver tips are available in most DIY
stores like Lowes, Home Depot, Menards, Harbor Freight etc.---if you know where
to look for them. They are included in many of the multi bit sets, the ones that
have assortment of phillips, square, torx, plain---all those.
Phillips are marked P1etc and pozidrive are PZ1
etc.
They are there, just hiding.
Paul K0UYA
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MR501 info
Artekmedia
George
I started a new thread here with the correct model number which will likely draw you better attention You must have us partially confused with another dealer as we do not sell a "set" for the TM500 Series (The only set we sell is one for the the 7000 Series plug-ins). Visit the new web site www.ArtekManuals.com for more detail Good luck with your new toy Dave Manuals@... On 10/16/2012 7:35 AM, GeorgeP wrote: MR501. I have a few of your excellent scans and you are "in my back pocket".-- Dave Henderson Manuals@... www.Artekmanuals.com PO Box 175 Welch,MN 55089 651-269-4265 |
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Re: 7B92 No Auto trigger
Albert
Hi Andy,
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Here some more details. Maybe you feel unsure about waveform voltage levels. In Normal sweep mode, TP365 (the TD) is high (570 mV, my 7B92) during the sweep and low (65 mV) between sweeps (hold-off time and while waiting for the next trigger event). In Intensified mode and Level pushed in, TP365 remains low during the delay period and then switches to high. For some reason the level between sweeps is somewhat lower now, 40 mV. The switch to high moves when the Delay dial is turned. (Test 'scope, at which the waveforms are shown, triggered for a stable saw tooth at TP408.) With Level out, the waveform remains the same, but you might see a small upwards shift in the high level where the delayed sweep starts. Now if your TP365 goes high immediately (at start of the sweep at TP408), regardless dial setting, then check also one step backwards. You should see square wave signals at both sides of the diode pair CR358/CR359, while the duty cycles vary when you turn the Delay dial. If so, this confirms that the comparator Q359A/B is working. Next the collector of Q376 should switch to high after the delay period, with voltage step even larger than that of the TD. If TP365 gets higher than about .6 V then the TD is defective. Hope this helps. Albert I had a few minutes to do some probing, and it looks like CR364 is being triggered on the leading (falling) edge of the square wave from the collector of Q376 which is fed by the comparator (Q359). R364 has an effect, but doesn't change the situation significantly. |
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Re: MR10
Thank you Dave - you are most correct - it was early morning - it is MR501.
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I have a few of your excellent scans and you are "in my back pocket". MR501 is not on your TM500SET which I have. I just got this item and am just getting started. You may hear from me soon. George --- In TekScopes@..., Artekmedia <manuals@...> wrote:
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Re: MR10
Artekmedia
开云体育GeorgeYou sure about the model number?? I can find no reference to the unit anywhere in the literature?? Could it be a MR501 ? ( We have the manuals for the MR501 :-)? ) Dave On 10/16/2012 5:39 AM, GeorgeP wrote: ? -- Dave Henderson Manuals@... PO Box 175 Welch,MN 55089 651-269-4265 |
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Re: Screwdriver for Pozidriv (Pozi) Screws used by Tek
Albert
--- I used aThat seems to be the way to destroy both ;=) In my 547s, some handle bar screws are PZ2, and some are PH2. You feel immediately that the wrong combination of bit and head is wrong indeed. Like Fred mentioned, all types of bits are so common over here. Albert |
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Re: Screwdriver for Pozidriv (Pozi) Screws used by Tek
A few years ago I purchased a "Security Bit Set" from the Cheap Chinese Junk Store AKA Harbor Freight, it has a number of Posi drive bits in it. Also HP used the Posi Drives in a lot of their equipment back in the 70's. I still have a couple running around some where.
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Bill Higdon --- In TekScopes@..., Miroslav Pokorni <mpokorni@...> wrote:
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Re: Screwdriver for Pozidriv (Pozi) Screws used by Tek
开云体育I bought posidrive bits at . The bits seem to be good quality, do not round off easily. I used a posidrive bit on a Philips head screw where I could not get any traction with a good Philips screwdriver. Posidrive worked like acharm.Miroslav Pokorni On 10/15/2012 9:49 PM, Lyle Bickley wrote: ? |
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Re: Screwdriver for Pozidriv (Pozi) Screws used by Tek
Just looked at some Teks, my 547 and scope mobile had philips, exceot the frontpanel seems to have some torque. The 453 had Philipd but the fan is nounted With pozidriv, the 7000 serie looked all pozidrive and some generators, calibration gear other stuff looked like most was pozidriv ( sometimes hard to see because the use of the wrong screwdrivers in the past. Like the allen bolts in the knobs of scopes ect. Inch size allen is rare over here so many previous owners have killed the allan hex heads of those screws using metric size allan keys.
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Fred ( tool junkie) --- In TekScopes@..., "fred" <fredschneider@...> wrote:
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Re: Screwdriver for Pozidriv (Pozi) Screws used by Tek
To be specific. I think you mean, hardware store in the USA. There is a wild outside the US, we use strange things like metric instead of Inch, Celcius instead of Fahrenheit ect. And so there are many tools a " standard over here but as rare as metric in the US.
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In Holland and as far a I know a big part of Europe, you can buy them everywhere. Even sub 5 euro sets from food-supermarktets like Lidl or Aldi have them included. ( most times a screwdriver with exchangsble bits) i think I have somewhere around ( including bits) 20-30 pozidriv's. Almost all woodscrews here are pozidriv. Also most "parkers" , the selfcutting screws for use in metal. Bolts not with a hex wrench head are almost always Philips but in modern stuf more often torque or Hex. Fred --- In TekScopes@..., "Dennis Tillman" <dennis@...> wrote:
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Re: Screwdriver for Pozidriv (Pozi) Screws used by Tek
Stefan Trethan
Here in Europe pozidrive is the standard for most mechanical screws.
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Mechanics screwdriver sets typically come with pozidrive, electricians sets typically come with philips, so we can easily get both in any hardware store. Yes of course you need full sets of both types, using the wrong driver just mangles the screw, I wouldn't think of it. Modern electronics most often use a Philips size 2 on small screws, which is quite a large driver for the screws. Many people mistakenly use a pozidrive size 1 or even philips size 1 instead, which drives me crazy. For recessed screws (think electric drill housing) you sometimes need a Philips size 2 with a slim shaft to get into the recess (the regular one is 6mm). Since the Philips profile is tapering a Philips size 1 can be made into a reasonably fitting Philips size 2 by grinding the very tip off. It isn't exactly right because of the radius from grinding, but still much better than using a pozidrive 1 instead. I suspect the use of philips 2 instead of philips 1 even for such small screws is that the larger profile produces less wear on the screw head punching tool, and the screwdriver is longer wearing in mass production. So many people don't understand the difference or can't identify the size, I annoy people by insisting they tell me the exact type they want to borrow before handing anything out. ST
On Tue, Oct 16, 2012 at 6:25 AM, Dennis Tillman <dennis@...> wrote:
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Re: Screwdriver for Pozidriv (Pozi) Screws used by Tek
On Mon, 15 Oct 2012 21:25:00 -0700
"Dennis Tillman" <dennis@...> wrote: Tek used Pozi screws in all of their equipment as far back as the late--snip-- Thank for the suggestion - just bought one :-) Cheers, Lyle -- Bickley Consulting West Inc. "Black holes are where God is dividing by zero" |
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2445A Calibration question
I am getting a Test 04 Fail 01 error on a 2445A scope and I have been through the cal proceedure four times. I keep getting the error but when I exit out of the self test, every thing works fine.
Going through the calibration has no issues, no limit errors, etc. Is there anyway to tell what is causing the fail? The manual says the Fail01 is a parity error with the calibration data. Is there any way to tell where this error is? I know that one can examine the ram contents. Is there anything that clues on into what the data should be? Thanks, Tom |
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Screwdriver for Pozidriv (Pozi) Screws used by Tek
开云体育Tek used Pozi screws in all of their equipment as far back as the late 1960s. At casual glance they look like Phillips Head screws with four little marks at 45 degree angles to the slots. There is an important difference between Pozi screws and Philips screws. ? Pozidrives are not something you can get at your local hardware store so I never bought one before now. After years of using a Phillips screwdriver on my Tek equipment I finally decided I had to find out whether a Pozidriv screwdriver would make a difference. The difference is apparent immediately! ? I paid $2.00 + $2.25 shipping for one on Ebay. Now I’m kicking myself for waiting so long. This is definitely worth it. The one I bought (I have no affiliation with the seller) is called “GearWrench 80084 #1 x 3-1/8" Pozi Insulated Screwdriver”. The seller has 362 of them at this ‘Buy It Now’ price so he is not likely to run out any time soon. ? ? This excerpt from Wikipedia explains the difference between a Pozidrive and a Phillips drive: ? “The Pozidriv, sometimes misspelled Pozidrive, screw drive is an improved version of the Phillips screw drive. It is jointly patented by the Phillips Screw Company and American Screw Company. The name is thought to be an abbreviation of positive drive. Its advantage over Phillips drives is its decreased likelihood to cam out, which allows greater torque to be applied. ? Phillips drivers have an intentional angle on the flanks and rounded corners so they will cam out of the slot before a power tool will twist off the screw head. The Pozidriv screws and drivers have straight sided flanks. The Pozidriv screwdriver and screws are also visually distinguishable from Phillips by the second set of radial indentations set 45 degrees from the cross recess. The manufacturing process for Pozidriv screwdrivers is slightly more complex. The Phillips driver has four simple slots cut out of it, whereas in the Pozidriv each slot is the result of two machining processes at right angles. The result of this is that the arms of the cross are parallel-sided with the Pozidriv, and tapered with the Phillips. ? This design is intended to decrease the likelihood that the Pozidriv screwdriver will slip out, provide a greater driving surface, and decrease wear. Phillips screwdrivers will fit in and turn Pozidriv screws, but will cam out if enough torque is applied, potentially damaging the screw head.” ? Dennis |
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Re: 2465b CRT Termination Question R1501 **update** cursor question
开云体育There are adjustments for the horizontal gain (for x1 and x10) and position
and it is done in the Cal-01 process.
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The vertical adjustments are done in cal-02.
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A good read of the calibration section would get you up to speed.
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Re: 2465b CRT Termination Question R1501 **update** cursor question
Thanks for the responce.
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This id the scope I am waiting for the new U400 to arrive to fis the vertical compression issue. In the meantime I have been testing other functions. The vertical measurement cursors can bet set one line up with the top graticule the other lined up with the bottom graticule, full screen coverage). The left horizontal cursor will not go all of the way to left side of the CRT, about 1/3 off. The other cursor goes off scale right. Both vertical and horzontal cursors measure correctly based on volts and time settings with the graticules. Normal? Part of the bad U400? Or another adjustment? Thanks --- In TekScopes@..., "Tom Miller" <tmiller11147@...> wrote:
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Re: 7B92 No Auto trigger
开云体育Re: 7B92 No Auto triggerSat Oct?13,?2012 10:39?am (PDT) . Posted by:"baltimora86" baltimora86've managed to confirm that the sawtooth is running when in auto mode, but it's not getting to the output. Even if I force it to the output, the display is being blanked. I think it's a logic problem, but without any waveforms, or voltages I keep going in circles.
The 7B92 I bought has exactly the same problem.? I hope to have
a look at it sometime this week after my car problem is
fixed.(first got to download a schematic) John |
GeorgeP
Lyle Bickley