Date   

Re: Deane Kidd and the Metric System

n4buq
 

I worked in a metric shop for 10 years. I pretty much always used 25.4 as the conversion factor. 0.03937 is a rounded recriprocal of 25.4 which is technically the correct conversion factor between inches and millimeters (and easier for me to remember).

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "Tom Jobe tomjobe@gmail.com [TekScopes]" <TekScopes@yahoogroups.com>
To: TekScopes@yahoogroups.com
Sent: Thursday, December 14, 2017 6:36:53 PM
Subject: Re: [TekScopes] Deane Kidd and the Metric System

That is a very neat trick... but consider this simple plan:
For the fractional part of the dimension, divide the bottom number into
the top number to get its decimal equivalent.
Example   (7/16" = 7 divided by 16 gives you 0.4375 inches)
If there are whole inches involved in the measurement then it becomes
1.4375, 2.4375 etc.
Divide the decimal inch number by .03937 and you have your millimeter
equivalent.
Example ( our 7/16" is 0.4375 decimal inches, we divide it by .03937 and
we have our answer of 11.11125 mm.
Memorizing the number .03937 solves the whole problem going either way,
to or from inches and millimeters.
Let's have an example of going from millimeters to inches:
If you multiply 100mm by .03937 you will get it's equivalent in inches,
100 x .03937 = 3.937 inches.
The number .03937 is simply how many inches are in one millimeter.
This .03937 method was the common way that millimeters and inches were
dealt with in shops I worked at in the US.
tom jobe...


On 12/14/2017 4:02 PM, 'Craig Sawyers' c.sawyers@tech-enterprise.com
[TekScopes] wrote:

On the topic of conversion between Imperial and SI units of length
there is a well known method of
quickly converting aliquot parts of an inch to millimetres using the
approximation 254 = 256

If you have a fractional inch dimension, multiply top and bottom of
the fraction by two repeatedly
until
the denominator equals 256.? Shift the decimal point of top and
bottom one place to the left.? The
numerator now equals the inch dimension times 25.6, which is the
equivalent number of millimetres
(to less than 1% error)
Ian
Darn, that is a neat trick. I really like simple numerical methods
like that.

Craig



[Non-text portions of this message have been removed]



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Yahoo Groups Links




Re: Tek 2753P Manuals

tomb8mail
 

So, I found some manuals for a 494AP which is similar to mine. Also found some 494 repair notes which looks to be a good find. Anyway, I finally got around to powering it up with a dim bulb circuit and a 200W bulb. A couple LEDS on the front came on and the scope backlights but that is it. The bulb in the test circuit also lit to about half brightness I would guess, not sure if it's safe to hook up to the variac and get some power board voltages??? Got the case off, very nice and clean inside, good sign. One of the main filter caps has the plastic a little ruffled on top so maybe that got a little hot at some point. Having a little difficulty getting to the power board, not sure if the go by from the 494 is the same so I am kinda hesitant to go any further trying to disassemble it. Hoping it's just a few electrolytics to replace get her up and going. The downside to this unit is that it is a huge beast of a machine. Have no clue where I will set this up if I ever get it going.

http://www.antiqueradios.com/forums/download/file.php?id=198994


Re: 7904A readout bounce

 

Thermal offsets are literally that, offset voltage drift in the
differential pairs through the horizontal and vertical signal paths.
They are caused by the changes in operating points with signal level
which result in a change in power dissipation and temperature in the
individual transistors.

At higher frequencies, the changes in power dissipation average out
but alternate mode occurs at a frequency determined by the sweep
lengths so it is slower than any individual sweep and slower yet than
the vertical signal.

If you want to see the effect in a controlled way, watch how the
readout shifts when X-Y mode is used and the beam is moved to
different points on the display. This is (usually) not the result of
electrical leakage between the beam position and readout; it is caused
by changing the operating point of the transistors ultimately changing
their temperature which changes their current gain and base-emitter
voltage.

On Thu, 14 Dec 2017 21:56:26 +0000, you wrote:

On further investigation this is vertical bounce due to ALT mode being invoked either on the plug-in or the mainframe when lowish scan rates are used. I didn't see anything about this matter in the manual; I wonder if there is a supply decoupling problem somewhere?

Regards

Nigel


Re: Deane Kidd and the Metric System

Tom Jobe <tomjobe@...>
 

That is a very neat trick... but consider this simple plan:
For the fractional part of the dimension, divide the bottom number into
the top number to get its decimal equivalent.
Example (7/16" = 7 divided by 16 gives you 0.4375 inches)
If there are whole inches involved in the measurement then it becomes
1.4375, 2.4375 etc.
Divide the decimal inch number by .03937 and you have your millimeter
equivalent.
Example ( our 7/16" is 0.4375 decimal inches, we divide it by .03937 and
we have our answer of 11.11125 mm.
Memorizing the number .03937 solves the whole problem going either way,
to or from inches and millimeters.
Let's have an example of going from millimeters to inches:
If you multiply 100mm by .03937 you will get it's equivalent in inches,
100 x .03937 = 3.937 inches.
The number .03937 is simply how many inches are in one millimeter.
This .03937 method was the common way that millimeters and inches were
dealt with in shops I worked at in the US.
tom jobe...


On 12/14/2017 4:02 PM, 'Craig Sawyers' c.sawyers@tech-enterprise.com
[TekScopes] wrote:

On the topic of conversion between Imperial and SI units of length
there is a well known method of
quickly converting aliquot parts of an inch to millimetres using the
approximation 254 = 256

If you have a fractional inch dimension, multiply top and bottom of
the fraction by two repeatedly
until
the denominator equals 256.? Shift the decimal point of top and
bottom one place to the left.? The
numerator now equals the inch dimension times 25.6, which is the
equivalent number of millimetres
(to less than 1% error)
Ian
Darn, that is a neat trick. I really like simple numerical methods
like that.

Craig



[Non-text portions of this message have been removed]


Re: Deane Kidd and the Metric System

Craig Sawyers <c.sawyers@...>
 

On the topic of conversion between Imperial and SI units of length there is a well known method of
quickly converting aliquot parts of an inch to millimetres using the approximation 254 = 256

If you have a fractional inch dimension, multiply top and bottom of the fraction by two repeatedly
until
the denominator equals 256.? Shift the decimal point of top and bottom one place to the left.? The
numerator now equals the inch dimension times 25.6, which is the equivalent number of millimetres
(to less than 1% error)
Ian
Darn, that is a neat trick. I really like simple numerical methods like that.

Craig


Re: 7854 vs 7D20

redarlington
 

Hah, love it. You got me thinking that because of the speed, I could just
do a READX over gpib and pull the data in, process, and SENDX it back out
for display. Or, you know, display on the PC or use the specan 3 feet
away... Either way, this is very cool and much appreciated work. It also
might be neat to add a Raspberry Pi or some similar single board computer
externally to the 7854 to handle doing this without much additional bulk.
Hit a button and get the FFT.

-Bob

On Thu, Dec 14, 2017 at 1:12 AM, tekscopesinput@holgerluebben.de
[TekScopes] <TekScopes@yahoogroups.com> wrote:



Hi Dan!

Yes, the FFT program is available. You'll find a link to a zip archive at
the end of this message.
But the program needs some explanation.

The project was only a proof of concept and the program is a very limited
prototype.
<snip>


Re: Deane Kidd and the Metric System

Richard Knoppow
 

Sounds like an application for a Curta calculator.

On 12/14/2017 2:57 PM, Ian Newman ian_new@yahoo.com [TekScopes] wrote:

Hi,
On the topic of conversion between Imperial and SI units of length
there is a well known method of quickly converting aliquot parts of an
inch to millimetres using the approximation 254 = 256

I
--
Richard Knoppow
dickburk@ix.netcom.com
WB6KBL



[Non-text portions of this message have been removed]


Re: Deane Kidd and the Metric System

Ian Newman <ian_new@...>
 

Hi,
On the topic of conversion between Imperial and SI units of length there is a well known method of quickly converting aliquot parts of an inch to millimetres using the approximation 254 = 256

If you have a fractional inch dimension, multiply top and bottom of the fraction by two repeatedly until the denominator equals 256.  Shift the decimal point of top and bottom one place to the left.  The numerator now equals the inch dimension times 25.6, which is the equivalent number of millimetres (to less than 1% error)

For example, take a fractional inch dimension - 3/8

3/8 = 6/16
3/8 = 12/32
3/8 = 24/64
3/8 = 48/128
3/8 = 96/256

3/8 inch = 9.6mm (to better than 1%)
Actual conversion = 9.525mm

In actual use, simply count how many times you need to multiply the denominator to get 256, then multiply the numerator by two that many times and write down the answer, slipping in the decimal point as you do so.

E.g. 9/16
Multiply the denominator by 2 four times (32, 64, 128, 256).  Now multiply the numerator by 2 four times - 18, 36, 72, 144 - giving 14.4mm (actual value 14.29 to four sig. fig.)

If you have whole numbers of inches, convert to irrational fractions first:
2 3/4 inch = ((2 x 4) +3)/4 inch
=11/4 inch
= 704/256
= 70.4mm (actual value 69.85)


You can improve the accuracy (using mental arithmetic) by reducing the value of the answer by 1%. Take the first significant digit of the result, move the point two places left (divide by 100) and subtract from the original result.

Doing this to the examples above gives:

3/8 inch = 9.6mm
Better approximation:
3/8 = 9.6 - 0.09
= 9.51mm
Actual value = 9.525mm

9/16 inch = 14.4mm
Better approximation:
9/16 = 14.4 - 0.1
= 14.3mm
Actual value = 14.29mm

2 3/4 inch = 70.4mm
Better approximation:
2 3/4 = 70.4 - 0.7
= 69.7mm
Actual value = 69.85mm

Even I can multiply by two in my head......

All the best,
Ian




From: "Barry n4buq@knology.net [TekScopes]" <TekScopes@yahoogroups.com>
To: TekScopes@yahoogroups.com
Sent: Thursday, 14 December 2017, 13:47
Subject: Re: [TekScopes] Deane Kidd and the Metric System

  Instead of a ruler for size comparison, perhaps Walter can post pictures of those knobs alongside an assortment of coins from all around the world? :)

Thanks,
Barry - N4BUQ
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Re: 7904A readout bounce

NigelP
 

On further investigation this is vertical bounce due to ALT mode being invoked either on the plug-in or the mainframe when lowish scan rates are used. I didn't see anything about this matter in the manual; I wonder if there is a supply decoupling problem somewhere?

Regards

Nigel


Re: Deane Kidd and the Metric System

Harvey White
 

On Thu, 14 Dec 2017 17:24:26 +0000 (UTC), you wrote:

The Spanish dubloon, IIRC, had score marks on it which allowed it to
be easily broken into eighths. These were known as bits.

That we still retain the language of....

Harvey


"Life is a carnival, believe it or not.� �Life is a carnival, two bits a shot..."
� � � � � � � � �(The Band, "Life is a Carnival" - arguably the greatest example of Americana Folk Rock, ignoring the fact that most of them were Canadian)
� Dan

On Wednesday, December 13, 2017, 9:04:21 AM EST, Barry n4buq@knology.net [TekScopes] <TekScopes@yahoogroups.com> wrote:

�
The U.S. used to have a 1/8 dollar designation as a "bit". Two bits equals a quarter and is still sometimes heard amongst the older folks.

Thanks,
Barry - N4BUQ





Re: Deane Kidd and the Metric System

Geoffrey Thomas
 

On 14/12/2017 18:09, Tom Gardner tggzzz@gmail.com [TekScopes] wrote:
Inflation is a symptom; I'm more worried about the causes.
Austin Mitchell made sage observations in The Guardian on the 11th.
Even that prominent Brexiteer, John Redwood MP, advises his clients
to get their money out of the UK.
But that's too close to politics for comfort, in this group.
You're talking about THE John Redwood, arch ventriloquist and darling of linguists everywhere...

https://www.youtube.com/watch?v=GzBq0n8dxFQ

Geoff.


Re: Was: Deane Kidd and the Metric System, now nothing to do with it

Craig Sawyers <c.sawyers@...>
 

Please change the topic, fellas!

Craig

-----Original Message-----
From: TekScopes@yahoogroups.com [mailto:TekScopes@yahoogroups.com]
Sent: 14 December 2017 19:11
To: TekScopes@yahoogroups.com
Subject: Re: [TekScopes] Deane Kidd and the Metric System

Ooh, did they upgrade the trolleys with the new pound ?

Sent from my iPhone

On 14 Dec 2017, at 17:48, Tom Gardner tggzzz@gmail.com [TekScopes]
<TekScopes@yahoogroups.com> wrote:

Too big; wouldn't fit except with extreme force :)

On 14/12/17 17:44, 'James R. Bartlett' james.r.bart@gmail.com [TekScopes] wrote:

Probably used to release the trollies.!!!!

Jim

On 14 December 2017 at 17:30, Tom Gardner tggzzz@gmail.com [TekScopes] <
TekScopes@yahoogroups.com> wrote:

On 14/12/17 16:45, John Griessen john@ecosensory.com [TekScopes] wrote:
On 12/14/2017 03:38 AM, Tom Gardner tggzzz@gmail.com [TekScopes] wrote:
The UK still mints several unusual coins which - importantly - can
be used in supermarkets.
You mean the current exchange rate on them is honored by supermarkets?
They are coins of the realm, so face value should be honoured
(presuming they are recognised)!

For obvious reasons, I would be delighted if someone offered
one to me on that basis :)





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Posted by: Robin Birch <robinb@ruffnready.co.uk>
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Yahoo Groups Links



Re: Tektronix 2213a manual with single page schematic diagrams

 

On Thu, 14 Dec 2017 13:33:18 -0600, you wrote:

The manual for the 2215A can be used for everything on the 2213A
except timebase B circuits.

I do not have the 2213A schematic however I uploaded some cleaned up
2215A schematics that I compiled. Thank Yahoo if their provided URL
does not work. If that is a problem, then I can upload them somewhere
else.

<https://xa.yimg.com/df/TekScopes/2215A+Schematics+11x17.pdf?token=Zq_g8pQx4iGV-mPmA7ZxVEruqanDEixxmVhl4UPcIHyKA6fBt49_tgpB1l8N5PzpTWVbv7uZ_UOczZxC0tOBizPsrChhOK3THs9jQQ9ZUJ8jtEpVmZ9iijLY52TP&type=download>
Now hosted at Tekwiki as well thanks to Kurt.

<http://w140.com/tekwiki/images/c/c4/Tek_2215A_Schematics_11x17.pdf>


Re: Deane Kidd and the Metric System

Tam Hanna
 

With all military respect, but this is bullshit.


Inflation is a symptom; I'm more worried about the causes.

Inflation is not a symptom. Inflation is a byproduct of a fiat currency and a political system. If money can be debased, it will be debased to fund "gibs me dat" programs.


--

With best regards
Tam Hanna
---

NEW: Enjoy electronics? Like seeing oscilloscopes get repaired? Please subscribe to my new YouTube channel -> http://www.youtube.com/user/MrTamhan


Re: c-12 camera

Bruce Griffiths
 

There's a wide range of lenses intended for industrial cameras available.

One of these should be suitable.

Edmund optics have a large number of such lenses.

You could also look on the Schneider Kreuznach website.

Some of these appear on ebay from time to time.

Bruce

On 15 December 2017 at 02:11 "Scott McGrath scott@mcscott.net [TekScopes]" <TekScopes@yahoogroups.com> wrote:



For those of us who are large format photographers as well as engineers many of us stocked up on polaroid 4x5 film because it had many unique qualities.

And it was expensive (3-4 dollars sheet) when it was last being produced by Polaroid

The New55 film is on par with the old Polaroid pricing. You can buy the upgraded 4x5 holders from the project or send yours in for an upgrade. The old 545 holders did have some nagging issues which the New55 people have corrected

As for use by 'hipsters' no not quite as large format photography requires considerable technical skill to even get a usable image. And it requires a large rigid tripod and patience and the ability to use a exposure meter intelligently, for advanced practitioners use of the 'Zone System' is common

None of those things are in the hipster wheelhouse.

What I've thought of doing is modifying a cooled astronomical camera for use in capturing single shot images from 7104. Has the high sensitivity required and is designed for flat field imaging, optics will be tricky though







[Non-text portions of this message have been removed]


Re: Deane Kidd and the Metric System

Colin Herbert
 

Oh, dear. I think I should probably offer an apology for mentioning Deane and the metric system in conjunction with Walter’s knob project. What I thought was simply a wake-up call about the design dimensions of Tek knobs has gone so far off-topic, even if interesting to many.

How many Tek scopes can you get in a supermarket shopping-trolley? (That’s a rhetorical question).

Colin.



From: TekScopes@yahoogroups.com [mailto:TekScopes@yahoogroups.com]
Sent: 14 December 2017 19:26
To: TekScopes@yahoogroups.com
Subject: Re: [TekScopes] Deane Kidd and the Metric System






Not around here they didn't ;-) Still, the Heart Foundation sell a token to go on your keyring that is the correct size! Works a treat :-)

Dave


On 14/12/2017 19:10, Robin Birch robinb@ruffnready.co.uk <mailto:robinb@ruffnready.co.uk%3cmailto:robinb@ruffnready.co.uk> <mailto:robinb@ruffnready.co.uk> [TekScopes] wrote:


Ooh, did they upgrade the trolleys with the new pound ?

Sent from my iPhone

On 14 Dec 2017, at 17:48, Tom Gardner tggzzz@gmail.com <mailto:tggzzz@gmail.com%3cmailto:tggzzz@gmail.com> <mailto:tggzzz@gmail.com> [TekScopes] <TekScopes@yahoogroups.com><mailto:TekScopes@yahoogroups.com> wrote:

Too big; wouldn't fit except with extreme force :)

On 14/12/17 17:44, 'James R. Bartlett' james.r.bart@gmail.com <mailto:james.r.bart@gmail.com%3cmailto:james.r.bart@gmail.com> <mailto:james.r.bart@gmail.com> [TekScopes] wrote:

Probably used to release the trollies.!!!!

Jim

On 14 December 2017 at 17:30, Tom Gardner tggzzz@gmail.com <mailto:tggzzz@gmail.com%3cmailto:tggzzz@gmail.com> <mailto:tggzzz@gmail.com> [TekScopes] <
TekScopes@yahoogroups.com <mailto:TekScopes@yahoogroups.com%3cmailto:TekScopes@yahoogroups.com> <mailto:TekScopes@yahoogroups.com>> wrote:

On 14/12/17 16:45, John Griessen john@ecosensory.com <mailto:john@ecosensory.com%3cmailto:john@ecosensory.com> <mailto:john@ecosensory.com> [TekScopes] wrote:
On 12/14/2017 03:38 AM, Tom Gardner tggzzz@gmail.com <mailto:tggzzz@gmail.com%3cmailto:tggzzz@gmail.com> <mailto:tggzzz@gmail.com> [TekScopes] wrote:
The UK still mints several unusual coins which - importantly - can
be used in supermarkets.
You mean the current exchange rate on them is honored by supermarkets?
They are coins of the realm, so face value should be honoured
(presuming they are recognised)!

For obvious reasons, I would be delighted if someone offered
one to me on that basis :)
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Re: Tektronix 2213a manual with single page schematic diagrams

george edmonds
 

Artek list them


Re: Tektronix 2213a manual with single page schematic diagrams

 

On 13 Dec 2017 21:17:13 +0000, you wrote:

I want to work on my 2213a and I need schematics.

Searching online I found this document available from many websites:

http://w140.com/tektronix_2213_service.pdf http://w140.com/tektronix_2213_service.pdf
The 2213 is significantly different from the 2213A. They are
practically different series.

The problem with this document is that all of the fold outs (i.e. schematics and diagrams) are split among multiple pages. This makes it very difficult to view. I tried to print out the pages to put them together, but they do not fit together well.

Does anyone know where I can get the schematics on a single page apart from buying the paper manual on ebay?
The manual for the 2215A can be used for everything on the 2213A
except timebase B circuits.

I do not have the 2213A schematic however I uploaded some cleaned up
2215A schematics that I compiled. Thank Yahoo if their provided URL
does not work. If that is a problem, then I can upload them somewhere
else.

<https://xa.yimg.com/df/TekScopes/2215A+Schematics+11x17.pdf?token=Zq_g8pQx4iGV-mPmA7ZxVEruqanDEixxmVhl4UPcIHyKA6fBt49_tgpB1l8N5PzpTWVbv7uZ_UOczZxC0tOBizPsrChhOK3THs9jQQ9ZUJ8jtEpVmZ9iijLY52TP&type=download>


Re: Deane Kidd and the Metric System

David Slipper
 

Not around here they didn't ;-) Still, the Heart Foundation sell a token to go on your keyring that is the correct size! Works a treat :-)

Dave

On 14/12/2017 19:10, Robin Birch robinb@ruffnready.co.uk<mailto:robinb@ruffnready.co.uk> [TekScopes] wrote:


Ooh, did they upgrade the trolleys with the new pound ?

Sent from my iPhone

On 14 Dec 2017, at 17:48, Tom Gardner tggzzz@gmail.com<mailto:tggzzz@gmail.com> [TekScopes] <TekScopes@yahoogroups.com><mailto:TekScopes@yahoogroups.com> wrote:

Too big; wouldn't fit except with extreme force :)

On 14/12/17 17:44, 'James R. Bartlett' james.r.bart@gmail.com<mailto:james.r.bart@gmail.com> [TekScopes] wrote:

Probably used to release the trollies.!!!!

Jim

On 14 December 2017 at 17:30, Tom Gardner tggzzz@gmail.com<mailto:tggzzz@gmail.com> [TekScopes] <
TekScopes@yahoogroups.com<mailto:TekScopes@yahoogroups.com>> wrote:

On 14/12/17 16:45, John Griessen john@ecosensory.com<mailto:john@ecosensory.com> [TekScopes] wrote:
On 12/14/2017 03:38 AM, Tom Gardner tggzzz@gmail.com<mailto:tggzzz@gmail.com> [TekScopes] wrote:
The UK still mints several unusual coins which - importantly - can
be used in supermarkets.
You mean the current exchange rate on them is honored by supermarkets?
They are coins of the realm, so face value should be honoured
(presuming they are recognised)!

For obvious reasons, I would be delighted if someone offered
one to me on that basis :)


Re: Deane Kidd and the Metric System

 

Ooh, did they upgrade the trolleys with the new pound ?

Sent from my iPhone

On 14 Dec 2017, at 17:48, Tom Gardner tggzzz@gmail.com [TekScopes] <TekScopes@yahoogroups.com> wrote:

Too big; wouldn't fit except with extreme force :)

On 14/12/17 17:44, 'James R. Bartlett' james.r.bart@gmail.com [TekScopes] wrote:

Probably used to release the trollies.!!!!

Jim

On 14 December 2017 at 17:30, Tom Gardner tggzzz@gmail.com [TekScopes] <
TekScopes@yahoogroups.com> wrote:

On 14/12/17 16:45, John Griessen john@ecosensory.com [TekScopes] wrote:
On 12/14/2017 03:38 AM, Tom Gardner tggzzz@gmail.com [TekScopes] wrote:
The UK still mints several unusual coins which - importantly - can
be used in supermarkets.
You mean the current exchange rate on them is honored by supermarkets?
They are coins of the realm, so face value should be honoured
(presuming they are recognised)!

For obvious reasons, I would be delighted if someone offered
one to me on that basis :)

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