How to measure the settling time for a differential opamp wi

"John Larkin" <jjlarkin@highlandSNIPtechTHISnologyPLEASE.com> wrote in
message news:hhhqtvs0aukhd3sctvlri7m1pjgl1n1mf9@4ax.com...
On 14 Dec 2003 21:09:37 -0800, jjunkk@hotmail.com (Count) wrote:

Qns as above.
Thx

Oscilloscope.

Wlcm
Click to expand...
Is this what's called "small talk"?

i lk it it's so mch bttr thn wrtng fll sntns

Bb
 
On Sun, 14 Dec 2003 21:09:37 +0000, Count wrote:

Qns as above.
Thx
Click to expand...
If you can't be bothered to write out the question in the body, why should
anyone bother to tell you how to do it?

The settling time is the time it takes for a step waveform to get within a
particular percentage of its final falue.

Mac
 
On Sun, 14 Dec 2003 21:27:51 -0800, John Larkin
<jjlarkin@highlandSNIPtechTHISnologyPLEASE.com> Gave us:

On 14 Dec 2003 21:09:37 -0800, jjunkk@hotmail.com (Count) wrote:

Qns as above.
Thx

Oscilloscope.
Click to expand...
No. Digital Storage Oscilloscope.

Or at least a scope that leaves the last triggered trace up on the
screen. It is a very short event, with that load.

See definitions for the term "Critical Damping".
 
On Sun, 14 Dec 2003 22:13:20 -0800, "Mac" <foo@bar.net> Gave us:

If you can't be bothered to write out the question in the body, why should
anyone bother to tell you how to do it?
Click to expand...
Said the retarded troll fuck.
The settling time is the time it takes for a step waveform to get within a
particular percentage of its final falue.
Click to expand...
He didn't want a definition of what settling time is, dipass. He
asked how to observe and characterize it.
 
Ground one of the differential inputs and apply a squarewave signal to other
input. Look at the output on the CRO and see how long it takes transitions
settle as close as you require to step value.

Then swap inputs and repeat check.

Then connect both inputs to the squarewave source and see how common mode
rejection handles the step. Of course, you application may only require
common mode rejection of DC or low frequencies.

Roger



"Count" <jjunkk@hotmail.com> wrote in message
news:1aa4a550.0312142109.2f4c2b80@posting.google.com...
Qns as above.
Thx
Click to expand...
 
On Sun, 14 Dec 2003 22:25:54 -0800, DarkMatter
<DarkMatter@thebarattheendoftheuniverse.org> wrote:

On Sun, 14 Dec 2003 21:27:51 -0800, John Larkin
jjlarkin@highlandSNIPtechTHISnologyPLEASE.com> Gave us:

On 14 Dec 2003 21:09:37 -0800, jjunkk@hotmail.com (Count) wrote:

Qns as above.
Thx

Oscilloscope.

No. Digital Storage Oscilloscope.

Or at least a scope that leaves the last triggered trace up on the
screen. It is a very short event, with that load.
Click to expand...
Are you assuming you only get one chance to make the measurement?
Around here, we use pulse generators that *repeat* periodically.

To really resolve settling to fraction-percent levels, a Tek 7A13
differential comparator plugin is excellent, prefereably plugged into
a nice analog 7000-series mainframe. Adjust reprate for a nice image.

John
 
On Sun, 14 Dec 2003 22:27:51 -0800, DarkMatter
<DarkMatter@thebarattheendoftheuniverse.org> wrote:

On Sun, 14 Dec 2003 22:13:20 -0800, "Mac" <foo@bar.net> Gave us:


If you can't be bothered to write out the question in the body, why should
anyone bother to tell you how to do it?

Said the retarded troll fuck.

The settling time is the time it takes for a step waveform to get within a
particular percentage of its final falue.

He didn't want a definition of what settling time is, dipass. He
asked how to observe and characterize it.
Click to expand...

Oscilloscope.

John
 
I read in sci.electronics.design that John Larkin <jjlarkin@highlandSNIP
techTHISnologyPLEASE.com> wrote (in <uoprtvcvq9bhl0fi3dr95fr0s5v1ret6nf@
4ax.com>) about 'How to measure the settling time for a differential
opamp with a load of 10pF?', on Mon, 15 Dec 2003:

Adjust reprate for a nice image.
Click to expand...
Reprate is what radical centrists do. No way to create a nice image.
--
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
Interested in professional sound reinforcement and distribution? Then go to
http://www.isce.org.uk
PLEASE do NOT copy news posts to me by E-MAIL!
 
On Mon, 15 Dec 2003 08:58:43 -0800, John Larkin
<jjlarkin@highlandSNIPtechTHISnologyPLEASE.com> Gave us:

On Sun, 14 Dec 2003 22:27:51 -0800, DarkMatter
DarkMatter@thebarattheendoftheuniverse.org> wrote:

On Sun, 14 Dec 2003 22:13:20 -0800, "Mac" <foo@bar.net> Gave us:


If you can't be bothered to write out the question in the body, why should
anyone bother to tell you how to do it?

Said the retarded troll fuck.

The settling time is the time it takes for a step waveform to get within a
particular percentage of its final falue.

He didn't want a definition of what settling time is, dipass. He
asked how to observe and characterize it.


Oscilloscope.

No shit.
Click to expand...
 
In article <uoprtvcvq9bhl0fi3dr95fr0s5v1ret6nf@4ax.com>,
jjlarkin@highlandSNIPtechTHISnologyPLEASE.com says...
On Sun, 14 Dec 2003 22:25:54 -0800, DarkMatter
DarkMatter@thebarattheendoftheuniverse.org> wrote:

On Sun, 14 Dec 2003 21:27:51 -0800, John Larkin
jjlarkin@highlandSNIPtechTHISnologyPLEASE.com> Gave us:

On 14 Dec 2003 21:09:37 -0800, jjunkk@hotmail.com (Count) wrote:

Qns as above.
Thx

Oscilloscope.

No. Digital Storage Oscilloscope.

Or at least a scope that leaves the last triggered trace up on the
screen. It is a very short event, with that load.


Are you assuming you only get one chance to make the measurement?
Click to expand...
Wpuld you stick around with DimBulb experimenting on you?

Around here, we use pulse generators that *repeat* periodically.
Click to expand...
Those would be fully-automatic pulse generators? DO you need a
license for these things? Does Slowman know these are legal?

To really resolve settling to fraction-percent levels, a Tek 7A13
differential comparator plugin is excellent, prefereably plugged into
a nice analog 7000-series mainframe. Adjust reprate for a nice image.
Click to expand...
Oldies, but goodies. I remember staring at my first 7904, some
thirty years ago. Amazing beasties. ...and I couldn't find the
*ON* switch (a *large* bat-handle right in front of my eyes
d'oh!).

--
Keith
 
In article <p6pstvkdsma9kl7btia2lgatpc5e4hpuoj@4ax.com>,
DarkMatter@thebarattheendoftheuniverse.org says...
On Mon, 15 Dec 2003 08:58:43 -0800, John Larkin
jjlarkin@highlandSNIPtechTHISnologyPLEASE.com> Gave us:

On Sun, 14 Dec 2003 22:27:51 -0800, DarkMatter
DarkMatter@thebarattheendoftheuniverse.org> wrote:

On Sun, 14 Dec 2003 22:13:20 -0800, "Mac" <foo@bar.net> Gave us:


If you can't be bothered to write out the question in the body, why should
anyone bother to tell you how to do it?

Said the retarded troll fuck.

The settling time is the time it takes for a step waveform to get within a
particular percentage of its final falue.

He didn't want a definition of what settling time is, dipass. He
asked how to observe and characterize it.


Oscilloscope.

No shit.
Click to expand...
No digital storage needed, Dimbulb.

--
Keith
 
On Mon, 15 Dec 2003 22:07:38 -0500, Keith R. Williams
<krw@attglobal.net> wrote:
Are you assuming you only get one chance to make the measurement?

Wpuld you stick around with DimBulb experimenting on you?
Click to expand...
Good point. DampMatter can be, well, unsettling.

Around here, we use pulse generators that *repeat* periodically.

Those would be fully-automatic pulse generators?
Click to expand...
Actually, we prefer the five-speed manual overdrive model. This gives
superior control and better cornering.

DO you need a
license for these things? Does Slowman know these are legal?
Click to expand...
They are not EC compliant, if that's what you mean.

To really resolve settling to fraction-percent levels, a Tek 7A13
differential comparator plugin is excellent, prefereably plugged into
a nice analog 7000-series mainframe. Adjust reprate for a nice image.

Oldies, but goodies. I remember staring at my first 7904, some
thirty years ago. Amazing beasties. ...and I couldn't find the
*ON* switch (a *large* bat-handle right in front of my eyes
d'oh!).
Click to expand...
Dirt cheap on ebay these days.

John
 
On Mon, 15 Dec 2003 22:07:38 -0500, Keith R. Williams
<krw@attglobal.net> Gave us:

...and I couldn't find the
*ON* switch (a *large* bat-handle right in front of my eyes
d'oh!).
Click to expand...
And the stupidity has endured.
 
On Mon, 15 Dec 2003 22:08:42 -0500, Keith R. Williams
<krw@attglobal.net> Gave us:

No digital storage needed, Dimbulb.
Click to expand...
For a single pulse.. Yes. Must be captured, not just guessed at.

You overshot, and are reflecting noise ringing, you should be
critically damped.
 
On Mon, 15 Dec 2003 18:50:36 +0000, John Woodgate
<jmw@jmwa.demon.contraspam.yuk> Gave us:

I read in sci.electronics.design that John Larkin <jjlarkin@highlandSNIP
techTHISnologyPLEASE.com> wrote (in <uoprtvcvq9bhl0fi3dr95fr0s5v1ret6nf@
4ax.com>) about 'How to measure the settling time for a differential
opamp with a load of 10pF?', on Mon, 15 Dec 2003:

Adjust reprate for a nice image.

Reprate is what radical centrists do. No way to create a nice image.
Click to expand...
Don't you mean that it is what body builders do?
 
On Sun, 14 Dec 2003 22:27:51 +0000, DarkMatter wrote:

On Sun, 14 Dec 2003 22:13:20 -0800, "Mac" <foo@bar.net> Gave us:


If you can't be bothered to write out the question in the body, why should
anyone bother to tell you how to do it?

[snip]

The settling time is the time it takes for a step waveform to get within a
particular percentage of its final falue.

He didn't want a definition of what settling time is, dipass. He
asked how to observe and characterize it.
Click to expand...
I've never heard (or seen) the term "dipass" before. And the OP didn't say
anything about "observing" or "characterizing."

Anyway, Once one knows what settling time is, measuring it is easy. If the
OP knows what settling time is, but can't figure out how to measure it,
then he shouldn't be cross-posting to sci.electronics.design.

Mac
 
I read in sci.electronics.design that DarkMatter <DarkMatter@thebaratthe
endoftheuniverse.org> wrote (in <hk3ttv4gp5vc98h2mft9ao0in6s4jovshq@4ax.
com>) about 'How to measure the settling time for a differential opamp
with a load of 10pF?', on Mon, 15 Dec 2003:
On Mon, 15 Dec 2003 18:50:36 +0000, John Woodgate
jmw@jmwa.demon.contraspam.yuk> Gave us:

I read in sci.electronics.design that John Larkin <jjlarkin@highlandSNIP
techTHISnologyPLEASE.com> wrote (in <uoprtvcvq9bhl0fi3dr95fr0s5v1ret6nf@
4ax.com>) about 'How to measure the settling time for a differential
opamp with a load of 10pF?', on Mon, 15 Dec 2003:

Adjust reprate for a nice image.

Reprate is what radical centrists do. No way to create a nice image.


Don't you mean that it is what body builders do?
Click to expand...
No. Sometimes it's spelt with a hyphen ' re-prate'.

The problem with Sloman's Theory of Deadpan Comedy is that people don't
even see there's a joke there.
--
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
Interested in professional sound reinforcement and distribution? Then go to
http://www.isce.org.uk
PLEASE do NOT copy news posts to me by E-MAIL!
 
On Mon, 15 Dec 2003 21:20:46 -0800, "Mac" <foo@bar.net> Gave us:

I've never heard (or seen) the term "dipass" before. And the OP didn't say
anything about "observing" or "characterizing."
Click to expand...
Read the title of the post again, dufus, I am not responsible for
your poorly developed vocabulary.

To measure:

"the dimensions, capacity, or amount of something ascertained by
measuring"

If that isn't "observe, and characterize" then the school you went
to needs to shoot you.

Observe.. Measure.

Characterize... determine settling time... through observation.

Doh! Gettinzeclue.
 
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