rant: filenames...

[Jeroen Belleman]

On 2021-11-15 13:52, Clive Arthur wrote:

On 15/11/2021 12:28, Rick C wrote:
On Monday, November 15, 2021 at 7:50:25 AM UTC-4, Jeroen Belleman wrote:

snip

Stamp out weird units! We need a different name for the kg.
We shouldn\'t have basic units with baked-in multiplier prefixes.

Isn\'t \'g\' the basic unit???


Yes, but it\'s the MKS system. Would have been neater if the gram was a thousand times bigger.

As for the Are, that should have been 1 m^2.

In SI, the kg is the base unit. It was recently redefined to
be based on some fundamental constants of nature, rather than
on the mass of a lump of metal in a vault near Paris.

The mks system is another thing that should be abandoned.
For some weird reason, it\'s still popular with cosmologists.

Jeroen Belleman

 

[Johann Klammer]

On 11/12/2021 03:06 PM, Johann Klammer wrote:

Altho, if it\'s slow stuff like a 400Hz sine, slowly varying, you may just have to measure the zero crossing
and guess the delay from that.

Also, 1 deg of 40kHz is around 70 nS.
I don\'t think this is relevant at all as it\'s well below your sampling period.
you could not compensate this with your 100kHz.

 

[Johann Klammer]

On 11/12/2021 03:06 PM, Johann Klammer wrote:

Altho, if it\'s slow stuff like a 400Hz sine, slowly varying, you may just have to measure the zero crossing
and guess the delay from that.

Also, 1 deg of 40kHz is around 70 nS.
I don\'t think this is relevant at all as it\'s well below your sampling period.
you could not compensate this with your 100kHz.

 

[Johann Klammer]

On 11/12/2021 03:06 PM, Johann Klammer wrote:

Altho, if it\'s slow stuff like a 400Hz sine, slowly varying, you may just have to measure the zero crossing
and guess the delay from that.

Also, 1 deg of 40kHz is around 70 nS.
I don\'t think this is relevant at all as it\'s well below your sampling period.
you could not compensate this with your 100kHz.

 

[Jeroen Belleman]

On 2021-11-15 13:52, Clive Arthur wrote:

On 15/11/2021 12:28, Rick C wrote:
On Monday, November 15, 2021 at 7:50:25 AM UTC-4, Jeroen Belleman wrote:

snip

Stamp out weird units! We need a different name for the kg.
We shouldn\'t have basic units with baked-in multiplier prefixes.

Isn\'t \'g\' the basic unit???


Yes, but it\'s the MKS system. Would have been neater if the gram was a thousand times bigger.

As for the Are, that should have been 1 m^2.

In SI, the kg is the base unit. It was recently redefined to
be based on some fundamental constants of nature, rather than
on the mass of a lump of metal in a vault near Paris.

The mks system is another thing that should be abandoned.
For some weird reason, it\'s still popular with cosmologists.

Jeroen Belleman


Sorry, I meant _cgs_ should be abandoned.

Jeroen Belleman

 

[Jeroen Belleman]

On 2021-11-15 13:52, Clive Arthur wrote:

On 15/11/2021 12:28, Rick C wrote:
On Monday, November 15, 2021 at 7:50:25 AM UTC-4, Jeroen Belleman wrote:

snip

Stamp out weird units! We need a different name for the kg.
We shouldn\'t have basic units with baked-in multiplier prefixes.

Isn\'t \'g\' the basic unit???


Yes, but it\'s the MKS system. Would have been neater if the gram was a thousand times bigger.

As for the Are, that should have been 1 m^2.

In SI, the kg is the base unit. It was recently redefined to
be based on some fundamental constants of nature, rather than
on the mass of a lump of metal in a vault near Paris.

The mks system is another thing that should be abandoned.
For some weird reason, it\'s still popular with cosmologists.

Jeroen Belleman


Sorry, I meant _cgs_ should be abandoned.

Jeroen Belleman

 

[Jeroen Belleman]

On 2021-11-15 13:52, Clive Arthur wrote:

On 15/11/2021 12:28, Rick C wrote:
On Monday, November 15, 2021 at 7:50:25 AM UTC-4, Jeroen Belleman wrote:

snip

Stamp out weird units! We need a different name for the kg.
We shouldn\'t have basic units with baked-in multiplier prefixes.

Isn\'t \'g\' the basic unit???


Yes, but it\'s the MKS system. Would have been neater if the gram was a thousand times bigger.

As for the Are, that should have been 1 m^2.

In SI, the kg is the base unit. It was recently redefined to
be based on some fundamental constants of nature, rather than
on the mass of a lump of metal in a vault near Paris.

The mks system is another thing that should be abandoned.
For some weird reason, it\'s still popular with cosmologists.

Jeroen Belleman


Sorry, I meant _cgs_ should be abandoned.

Jeroen Belleman

 

[Johann Klammer]

On 11/12/2021 03:06 PM, Johann Klammer wrote:

Altho, if it\'s slow stuff like a 400Hz sine, slowly varying, you may just have to measure the zero crossing
and guess the delay from that.

Also, 1 deg of 40kHz is around 70 nS.
I don\'t think this is relevant at all as it\'s well below your sampling period.
you could not compensate this with your 100kHz.

 

[John Robertson]

On 2021/11/11 11:31 p.m., Sylvia Else wrote:

On 12-Nov-21 1:01 pm, Jeff Liebermann wrote:
On Thu, 11 Nov 2021 14:48:38 +1100, Sylvia Else <sylvia@email.invalid>
wrote:

Bought a couple of oscilloscope probes today to replace those
damaged/lost.

They don\'t fit, because the plastic surround exceeds the specified
diameter for a BNC plug. My scope has a hole in its front plate to
accommodate a standard BNC plug, but it\'s not big enough for this
oversized plastic variant.

This probably saves several cents per probe, but created a problem I
didn\'t need.

Sylvia.

I had a similar problem with some long forgotten piece of SCADA
hardware.  The BNC plugs fit, but they were so close together that
even the official insertion/removal tool didn\'t fit.  However, this
was using a 50 ohm system, not the much higher impedance of a scope
probe.

I created an adapter of sorts to elevate every other connector.  It
was a UG-88C/U plug with BNC panel mount receptacle crammed into the
plug.  A short piece of bare wire connected the center pins and an
ugly solder blob connected the grounds:
https://www.newark.com/amphenol-rf/ug-88c-u/rf-coaxial-bnc-plug-50-ohm-cable/dp/04M6671>

https://www.newark.com/amphenol-rf/31-10/connector-bnc-bhd-jack-str-50/dp/38F1322?st=bnc%20panel>

The resulting adapter added about 1 inch to the length of the 50 ohm
connection.  Whether the added capacitance will cause problems on your
oscilloscope will need to be determined.

If you want to just see if such an adapter has a chance of working,
try connecting a BNC M-M adapter (UG-491A/U) to a BNC F-F adapter
(UG-914/U).  This will extend the line length by 1.75 inches.  If it
works, build a shorter adaptor.


I bought a male to male adapter and a female to female adapter, and
joined them together. Seems to work OK for the kinds of frequency I deal
with - it\'s only a 20MHz scope anyway.

The extra length of metal attached to the socket does make it easier to
damage the socket though.

Sylvia.

How about just build a short BNC plug and receptacle extension, with a
short length of cable between them? As you say it is only 20mHz...

John :-#)#

 

[John Robertson]

On 2021/11/11 11:31 p.m., Sylvia Else wrote:

On 12-Nov-21 1:01 pm, Jeff Liebermann wrote:
On Thu, 11 Nov 2021 14:48:38 +1100, Sylvia Else <sylvia@email.invalid>
wrote:

Bought a couple of oscilloscope probes today to replace those
damaged/lost.

They don\'t fit, because the plastic surround exceeds the specified
diameter for a BNC plug. My scope has a hole in its front plate to
accommodate a standard BNC plug, but it\'s not big enough for this
oversized plastic variant.

This probably saves several cents per probe, but created a problem I
didn\'t need.

Sylvia.

I had a similar problem with some long forgotten piece of SCADA
hardware.  The BNC plugs fit, but they were so close together that
even the official insertion/removal tool didn\'t fit.  However, this
was using a 50 ohm system, not the much higher impedance of a scope
probe.

I created an adapter of sorts to elevate every other connector.  It
was a UG-88C/U plug with BNC panel mount receptacle crammed into the
plug.  A short piece of bare wire connected the center pins and an
ugly solder blob connected the grounds:
https://www.newark.com/amphenol-rf/ug-88c-u/rf-coaxial-bnc-plug-50-ohm-cable/dp/04M6671>

https://www.newark.com/amphenol-rf/31-10/connector-bnc-bhd-jack-str-50/dp/38F1322?st=bnc%20panel>

The resulting adapter added about 1 inch to the length of the 50 ohm
connection.  Whether the added capacitance will cause problems on your
oscilloscope will need to be determined.

If you want to just see if such an adapter has a chance of working,
try connecting a BNC M-M adapter (UG-491A/U) to a BNC F-F adapter
(UG-914/U).  This will extend the line length by 1.75 inches.  If it
works, build a shorter adaptor.


I bought a male to male adapter and a female to female adapter, and
joined them together. Seems to work OK for the kinds of frequency I deal
with - it\'s only a 20MHz scope anyway.

The extra length of metal attached to the socket does make it easier to
damage the socket though.

Sylvia.

How about just build a short BNC plug and receptacle extension, with a
short length of cable between them? As you say it is only 20mHz...

John :-#)#

 

[legg]

On Sun, 14 Nov 2021 13:03:52 -0800 (PST), Michael Terrell
<terrell.michael.a@gmail.com> wrote:

On Saturday, November 13, 2021 at 3:36:05 PM UTC-5, legg wrote:

Relax, let Microsoft do it . . . . ;-p

That better be sarcasm. Win 10 locked up during an update yesterday. I had to reboot several times before it started tto actually do the update. It had been hung on \'restarting\' for over an hour when I did the first reboot. (It was middle of the night and I had dozed off.)

Microsoft is always offering stupid places to save documents,
requiring repeated directory navigation.

They even create \'my document\', \'my music\' and similar directories,
buried somewhere in the \'user\' pile-up.

It seems to remember some previous directories, but can\'t do
repeated saves to the same place, unless it\'s the directory
that the document originated from, prior to save.

When you do get the thing into the right directory, with a
suitable file name, the original remains unaltered in a stupid
place for posterity, for ever, unless you can find and erase it.
Same is probably true of every executable, installer etc etc,
not to mention browser trash.

If there weren\'t Terabyte HDDs, windows users would be in the
toilet.

I\'ve always created my own directory structure, holding, where
possible, related files and programs where they can be found
using the minimum of reason.

Strangely, a ecent Linux distro that I\'m trying to adopt doesn\'t
seem to allow this - even going so far as to deny the existence
of navigable disc and directory structures. Can\'t fathom that
philosophy.

RL

 

[legg]

On Sun, 14 Nov 2021 13:03:52 -0800 (PST), Michael Terrell
<terrell.michael.a@gmail.com> wrote:

On Saturday, November 13, 2021 at 3:36:05 PM UTC-5, legg wrote:

Relax, let Microsoft do it . . . . ;-p

That better be sarcasm. Win 10 locked up during an update yesterday. I had to reboot several times before it started tto actually do the update. It had been hung on \'restarting\' for over an hour when I did the first reboot. (It was middle of the night and I had dozed off.)

Microsoft is always offering stupid places to save documents,
requiring repeated directory navigation.

They even create \'my document\', \'my music\' and similar directories,
buried somewhere in the \'user\' pile-up.

It seems to remember some previous directories, but can\'t do
repeated saves to the same place, unless it\'s the directory
that the document originated from, prior to save.

When you do get the thing into the right directory, with a
suitable file name, the original remains unaltered in a stupid
place for posterity, for ever, unless you can find and erase it.
Same is probably true of every executable, installer etc etc,
not to mention browser trash.

If there weren\'t Terabyte HDDs, windows users would be in the
toilet.

I\'ve always created my own directory structure, holding, where
possible, related files and programs where they can be found
using the minimum of reason.

Strangely, a ecent Linux distro that I\'m trying to adopt doesn\'t
seem to allow this - even going so far as to deny the existence
of navigable disc and directory structures. Can\'t fathom that
philosophy.

RL

 

[legg]

On Sun, 14 Nov 2021 13:03:52 -0800 (PST), Michael Terrell
<terrell.michael.a@gmail.com> wrote:

On Saturday, November 13, 2021 at 3:36:05 PM UTC-5, legg wrote:

Relax, let Microsoft do it . . . . ;-p

That better be sarcasm. Win 10 locked up during an update yesterday. I had to reboot several times before it started tto actually do the update. It had been hung on \'restarting\' for over an hour when I did the first reboot. (It was middle of the night and I had dozed off.)

Microsoft is always offering stupid places to save documents,
requiring repeated directory navigation.

They even create \'my document\', \'my music\' and similar directories,
buried somewhere in the \'user\' pile-up.

It seems to remember some previous directories, but can\'t do
repeated saves to the same place, unless it\'s the directory
that the document originated from, prior to save.

When you do get the thing into the right directory, with a
suitable file name, the original remains unaltered in a stupid
place for posterity, for ever, unless you can find and erase it.
Same is probably true of every executable, installer etc etc,
not to mention browser trash.

If there weren\'t Terabyte HDDs, windows users would be in the
toilet.

I\'ve always created my own directory structure, holding, where
possible, related files and programs where they can be found
using the minimum of reason.

Strangely, a ecent Linux distro that I\'m trying to adopt doesn\'t
seem to allow this - even going so far as to deny the existence
of navigable disc and directory structures. Can\'t fathom that
philosophy.

RL

 

[LM]

I could use a 100 pin LQFP, but when it is impossible to know what
part is available next week, I cannot.

On Thu, 11 Nov 2021 13:56:52 -0800, John Larkin
<jlarkin@highland_atwork_technology.com> wrote:

On Thu, 11 Nov 2021 23:12:56 +0200, LM <sala.nimi@mail.com> wrote:

If they stay in stock, life is getting better.

Alas, not in our package. But maybe things are breaking.

 

[LM]

I could use a 100 pin LQFP, but when it is impossible to know what
part is available next week, I cannot.

On Thu, 11 Nov 2021 13:56:52 -0800, John Larkin
<jlarkin@highland_atwork_technology.com> wrote:

On Thu, 11 Nov 2021 23:12:56 +0200, LM <sala.nimi@mail.com> wrote:

If they stay in stock, life is getting better.

Alas, not in our package. But maybe things are breaking.

 

[LM]

I could use a 100 pin LQFP, but when it is impossible to know what
part is available next week, I cannot.

On Thu, 11 Nov 2021 13:56:52 -0800, John Larkin
<jlarkin@highland_atwork_technology.com> wrote:

On Thu, 11 Nov 2021 23:12:56 +0200, LM <sala.nimi@mail.com> wrote:

If they stay in stock, life is getting better.

Alas, not in our package. But maybe things are breaking.

 

[Tom Gardner]

On 15/11/21 13:29, legg wrote:

If there weren\'t Terabyte HDDs, windows users would be in the
toilet.

I think everything in that sentence is wrong

I\'ve always created my own directory structure, holding, where
possible, related files and programs where they can be found
using the minimum of reason.

Yup.

It is amusing that recent versions of Windows have reverted
/users (I think), just as MS used 40 years ago in their
other operating system, Xenix.

Strangely, a ecent Linux distro that I\'m trying to adopt doesn\'t
seem to allow this - even going so far as to deny the existence
of navigable disc and directory structures. Can\'t fathom that
philosophy.

Which one? That will allow me to ignore it.

 

[Tom Gardner]

On 15/11/21 13:29, legg wrote:

If there weren\'t Terabyte HDDs, windows users would be in the
toilet.

I think everything in that sentence is wrong

I\'ve always created my own directory structure, holding, where
possible, related files and programs where they can be found
using the minimum of reason.

Yup.

It is amusing that recent versions of Windows have reverted
/users (I think), just as MS used 40 years ago in their
other operating system, Xenix.

Strangely, a ecent Linux distro that I\'m trying to adopt doesn\'t
seem to allow this - even going so far as to deny the existence
of navigable disc and directory structures. Can\'t fathom that
philosophy.

Which one? That will allow me to ignore it.

 

[Lasse Langwadt Christensen]

fredag den 12. november 2021 kl. 16.36.37 UTC+1 skrev Martin Brown:

On 12/11/2021 14:33, jla...@highlandsniptechnology.com wrote:
On Fri, 12 Nov 2021 09:50:01 +0000, Martin Brown
\'\'\'newspam\'\'\'@nonad.co.uk> wrote:


I would not ask mountain rescue teams to save people who wonder up into
the mountain in flipflops using Google maps on their mobile phone to
navigate and then get lost when the battery runs out. The mountain
rescue teams are rather more forgiving but I think idiots who do that
should be charged for the full cost of their rescue.

I would limit treatment to life saving only for people who refuse to
wear seat belts and were mangled as a result of going through their
windscreen. That is another idiotic decision some make. A few mangled
survivors wondering around would do wonders for seat belt compliance.

Wow, good thing you don\'t make health-care policy. Every ER would have
an intake moralist on staff who would decide who should be rejected
and die.
Darwinism in action would be the hardest possible line. I am quite happy
to keep them alive but they can pay for their own plastic surgery to
reassemble their face if they have failed to wear a seat belt.

Do something stupid and you have to take responsibility for your actions.
US is particularly bad for this since airbag explosives are set to kill
smaller women drivers just to save the big fat lard arse who CBA to use
a seat belt. I don\'t think that is fair to women drivers YMMV. eg.

https://abcnews.go.com/US/wireStory/south-carolina-driver-killed-exploding-air-bag-inflator-77230834

Although that particular one was due to using unstable ammonium nitrate
as the propellant it was the *amount* of it that killed the driver.

Do european air bags have less propellant? Is the amount loaded on a
per-country basis?
Yes. US has a dodgy airbag policy resulting in a lot more fatalities
particularly of smaller women who have to sit closer to the steering
wheel. It is almost invariably that airbag that kills (or injures) them.

https://www.consumerreports.org/car-safety/crash-test-bias-how-male-focused-testing-puts-female-drivers-at-risk/

Somewhat more detailed analysis of the US kill smaller females airbag
policy here snappily titled \"Survey of Driver Seating Positions in
Relation to the Steering Wheel\". Being too close to it when it goes off
is a very bad thing:

https://www.jstor.org/stable/44741050

Short form version it is a bad idea to be a female driver under 5\'5\".

The same issue doesn\'t arise in Europe or Japan because seat belts are
mandatory there (and enforced).

afaiu most modern airbags have dual charges and fires one or both depending
on the size of the impact, weight of the driver, and if the seatbelt is on

 

[Lasse Langwadt Christensen]

fredag den 12. november 2021 kl. 16.36.37 UTC+1 skrev Martin Brown:

On 12/11/2021 14:33, jla...@highlandsniptechnology.com wrote:
On Fri, 12 Nov 2021 09:50:01 +0000, Martin Brown
\'\'\'newspam\'\'\'@nonad.co.uk> wrote:


I would not ask mountain rescue teams to save people who wonder up into
the mountain in flipflops using Google maps on their mobile phone to
navigate and then get lost when the battery runs out. The mountain
rescue teams are rather more forgiving but I think idiots who do that
should be charged for the full cost of their rescue.

I would limit treatment to life saving only for people who refuse to
wear seat belts and were mangled as a result of going through their
windscreen. That is another idiotic decision some make. A few mangled
survivors wondering around would do wonders for seat belt compliance.

Wow, good thing you don\'t make health-care policy. Every ER would have
an intake moralist on staff who would decide who should be rejected
and die.
Darwinism in action would be the hardest possible line. I am quite happy
to keep them alive but they can pay for their own plastic surgery to
reassemble their face if they have failed to wear a seat belt.

Do something stupid and you have to take responsibility for your actions.
US is particularly bad for this since airbag explosives are set to kill
smaller women drivers just to save the big fat lard arse who CBA to use
a seat belt. I don\'t think that is fair to women drivers YMMV. eg.

https://abcnews.go.com/US/wireStory/south-carolina-driver-killed-exploding-air-bag-inflator-77230834

Although that particular one was due to using unstable ammonium nitrate
as the propellant it was the *amount* of it that killed the driver.

Do european air bags have less propellant? Is the amount loaded on a
per-country basis?
Yes. US has a dodgy airbag policy resulting in a lot more fatalities
particularly of smaller women who have to sit closer to the steering
wheel. It is almost invariably that airbag that kills (or injures) them.

https://www.consumerreports.org/car-safety/crash-test-bias-how-male-focused-testing-puts-female-drivers-at-risk/

Somewhat more detailed analysis of the US kill smaller females airbag
policy here snappily titled \"Survey of Driver Seating Positions in
Relation to the Steering Wheel\". Being too close to it when it goes off
is a very bad thing:

https://www.jstor.org/stable/44741050

Short form version it is a bad idea to be a female driver under 5\'5\".

The same issue doesn\'t arise in Europe or Japan because seat belts are
mandatory there (and enforced).

afaiu most modern airbags have dual charges and fires one or both depending
on the size of the impact, weight of the driver, and if the seatbelt is on