
Re: Risetime calculator (in tekwiki)
Where is the calculator?
I do not want the virus one  someone said that one downloadable calculator
was a virus or bad calculator....
Thank you very much.
Tony
yahoo.com@groups.io> wrote:
Where is the calculator?
I do not want the virus one  someone said that one downloadable calculator
was a virus or bad calculator....
Thank you very much.
Tony
yahoo.com@groups.io> wrote:

By
Tony Fleming
·
#163568
·


Re: Your generosity is STUNNING!
Hey Denis,
looks like many people have reported they don't see their PayPal
transaction IDs in your log. I'm going to guess that PayPal assigns
different transaction IDs for each end of the
Hey Denis,
looks like many people have reported they don't see their PayPal
transaction IDs in your log. I'm going to guess that PayPal assigns
different transaction IDs for each end of the

By
Siggi
·
#163567
·


Re: Your generosity is STUNNING!
I concur. Consider it an appreciation award from the members of Tekscopes :)
Paul

Paul Amaranth, GCIH  Manchester MI, USA
Aurora Group of Michigan, LLC 
I concur. Consider it an appreciation award from the members of Tekscopes :)
Paul

Paul Amaranth, GCIH  Manchester MI, USA
Aurora Group of Michigan, LLC 

By
Paul Amaranth
·
#163566
·


Re: Your generosity is STUNNING!
A nice dinner for two $250
A couple of bottles of wine $100
Taking care of TekScopes, Priceless!
Dennis and Michael should: Put some of the money in your wallets.
A nice dinner for two $250
A couple of bottles of wine $100
Taking care of TekScopes, Priceless!
Dennis and Michael should: Put some of the money in your wallets.

By
Errick
·
#163565
·


Re: Your generosity is STUNNING!
Dennis, I did not see mine in the list.
January 1st for $20.00
3SH79206CC5260117 via PayPal
I don't need it back. Please put it in a savings account aside for the future of the group. Or donate to
Dennis, I did not see mine in the list.
January 1st for $20.00
3SH79206CC5260117 via PayPal
I don't need it back. Please put it in a savings account aside for the future of the group. Or donate to

By
Richard in Edenton NC
·
#163564
·


Re: 465 (Late S/N) Timing Board (A7) 670346700?
Check here:
https://www.eevblog.com/forum/buysellwanted/fsnewtestequipmentrepairpartshpagilenttektronixflukeetc/
Check here:
https://www.eevblog.com/forum/buysellwanted/fsnewtestequipmentrepairpartshpagilenttektronixflukeetc/

By
DaveH52
·
#163563
·


Re: Your generosity is STUNNING!
Maybe ask for just one dollar next time.
Enjoy your new DMM!
Maybe ask for just one dollar next time.
Enjoy your new DMM!

By
DaveH52
·
#163562
·


Re: Risetime calculator (in tekwiki)
This originates I think from the idea that around a maximum or minimum a function is quadratic plus higher order terms.
If you short together both ends of a linear pot then the resistance to the wiper
This originates I think from the idea that around a maximum or minimum a function is quadratic plus higher order terms.
If you short together both ends of a linear pot then the resistance to the wiper

By
Albert Otten
·
#163561
·


Re: Your generosity is STUNNING!
Hi Dennis,
As a list owner, I can attest to the amount of work that it can be.
PLEASE keep my donation for the future, and even (as someone else said) take your wife and Michael and his wife out to
Hi Dennis,
As a list owner, I can attest to the amount of work that it can be.
PLEASE keep my donation for the future, and even (as someone else said) take your wife and Michael and his wife out to

By
Phillip Potter
·
#163560
·


Re: Risetime calculator (in tekwiki)
It's not intuitive but if you do the math it is, indeed works out perfectly linear  assuming the trim pots are set to the value of 50R.
Whoever designed it, deserves to be an employee of the
It's not intuitive but if you do the math it is, indeed works out perfectly linear  assuming the trim pots are set to the value of 50R.
Whoever designed it, deserves to be an employee of the

By
Leo Bodnar
·
#163559
·


Re: Risetime calculator (in tekwiki)
Roy, your last two comments make no sense.
Albert has already determined that the taper of the pots is
*linear* and the scales of the two pots are *linear*, and
proved it out mathematically.
Read
Roy, your last two comments make no sense.
Albert has already determined that the taper of the pots is
*linear* and the scales of the two pots are *linear*, and
proved it out mathematically.
Read

By
Chuck Harris
·
#163558
·


Re: Your generosity is STUNNING!
Hi,
I'm sure that I'm something wrong, but I don't see the list of contributors. A cue is appreciated.
Ignacio, EB4APL
Hi,
I'm sure that I'm something wrong, but I don't see the list of contributors. A cue is appreciated.
Ignacio, EB4APL

By
EB4APL
·
#163557
·


Re: Risetime calculator (in tekwiki)
Hi Dave:
If you have a chance... maybe you can determine the taper of the pots, with an multimer/ohmmeter (they are all identical, stamped 5000, 140416).
You might have to disconnect the wiper lug,
Hi Dave:
If you have a chance... maybe you can determine the taper of the pots, with an multimer/ohmmeter (they are all identical, stamped 5000, 140416).
You might have to disconnect the wiper lug,

By
Roy Thistle
·
#163556
·


Re: Risetime calculator (in tekwiki)
Hi GerryR, see for instance https://groups.io/g/TekScopes/message/163507 .
Albert
Hi GerryR, see for instance https://groups.io/g/TekScopes/message/163507 .
Albert

By
Albert Otten
·
#163555
·


Re: Risetime calculator (in tekwiki)
I'm not sure I understand what you mean Roy. The x in my story is linear in the rotation angle, linear but rescaled to run from 0 (fully ccw) to 1 (fully cw). Of course you can avoid the angle in the
I'm not sure I understand what you mean Roy. The x in my story is linear in the rotation angle, linear but rescaled to run from 0 (fully ccw) to 1 (fully cw). Of course you can avoid the angle in the

By
Albert Otten
·
#163554
·


Re: Risetime calculator (in tekwiki)
Albert,
That's great, but where do you use such an instrument. I'm trying to figure out where three risetimes, or two as the case may be, react to give me a single total risetime. It's a neat
Albert,
That's great, but where do you use such an instrument. I'm trying to figure out where three risetimes, or two as the case may be, react to give me a single total risetime. It's a neat

By
GerryR
·
#163553
·


Re: Risetime calculator (in tekwiki)
Hi David, Hi All:
On your schematic posted at
https://vintagetek.org/risetimecalculator/
IMHO you are missing connections to chassis ground (the negative terminal of the battery), for each leg of
Hi David, Hi All:
On your schematic posted at
https://vintagetek.org/risetimecalculator/
IMHO you are missing connections to chassis ground (the negative terminal of the battery), for each leg of

By
Roy Thistle
·
#163552
·


Re: Risetime calculator (in tekwiki)
Thanks Albert, I did one spot calculation with ABC at midtravel and the result was exact so I was just settling down to do the full calculation.
Roger
Thanks Albert, I did one spot calculation with ABC at midtravel and the result was exact so I was just settling down to do the full calculation.
Roger

By
Roger Evans
·
#163551
·


Re: Risetime calculator (in tekwiki)
Hi Albert:
Though it has been mentioned... I think because the pot scales are marked off, linearly... one needs to use log tapered pots (math won't change, unless you add in the function(s) necessary
Hi Albert:
Though it has been mentioned... I think because the pot scales are marked off, linearly... one needs to use log tapered pots (math won't change, unless you add in the function(s) necessary

By
Roy Thistle
·
#163550
·


Re: 7A26 transient response 5 nS all atten
Hello Jon,
Difficult to read in the picture, but for probe calibration remember that the input capacitance changed at some S/N from 20 pF to 22 pF.
I also have several 7A26s as general purpose
Hello Jon,
Difficult to read in the picture, but for probe calibration remember that the input capacitance changed at some S/N from 20 pF to 22 pF.
I also have several 7A26s as general purpose

By
Albert Otten
·
#163549
·
