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Re: Python programming

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On 2014-03-07, William Ray Wing <wrw@mac.com> wrote:
> On Mar 6, 2014, at 8:24 PM, Roy Smith <roy@panix.com> wrote:

>>> I spotted a device on the table of the company calibration office...
>>> 
>>> As I recall, it was a 100A capable resistor... 0.10 OHM.
>>> 
>>> No idea what it was meant for; big binding posts at one end, and a
>>> slab of sheet steel in a "W" shape (smooth curves, not sharp bends).
>> 
>> External shunt for an ammeter?
>>  
>
> More likely a dummy load for power supply testing.

Could be.  Back when I was working on PWM controllers for golf cart
and small car motors, we used to use steel coathangers for test loads,
but once they got past orange and more towards yellow, they started to
get too soft.  An appropriately dimensioned chunk of sheet steel would
have been ideal.

> (Normally, ammeter shunts are sized to dissipate as little power as
> possible.)

I've used chunks of coathanger for that too, but I don't think the
resistance was stable enough over temperature to trust the results at
higher currents.

-- 
Grant Edwards               grant.b.edwards        Yow! If elected, Zippy
                                  at               pledges to each and every
                              gmail.com            American a 55-year-old
                                                   houseboy ...

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Python programming ngangsia akumbo <ngangsia@gmail.com> - 2014-02-11 16:21 -0800
  Re: Python programming Chris Angelico <rosuav@gmail.com> - 2014-02-12 12:17 +1100
  Re: Python programming Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-02-11 21:06 -0500
  Re: Python programming Rustom Mody <rustompmody@gmail.com> - 2014-02-11 18:46 -0800
  Re: Python programming Roy Smith <roy@panix.com> - 2014-02-11 22:02 -0500
    Re: Python programming Gene Heskett <gheskett@wdtv.com> - 2014-02-11 23:14 -0500
    Re: Python programming Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-02-12 13:41 +0000
    Re: Python programming Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-02-12 21:00 -0500
      Re: Python programming Grant Edwards <invalid@invalid.invalid> - 2014-02-13 02:57 +0000
        Re: Python programming Roy Smith <roy@panix.com> - 2014-02-12 22:04 -0500
          Re: Python programming Chris Angelico <rosuav@gmail.com> - 2014-02-13 14:13 +1100
            Re: Python programming Grant Edwards <invalid@invalid.invalid> - 2014-02-13 15:13 +0000
          Re: Python programming William Ray Wing <wrw@mac.com> - 2014-02-12 22:56 -0500
            Re: Python programming Dan Sommers <dan@tombstonezero.net> - 2014-02-13 05:18 +0000
          Re: Python programming Larry Martell <larry.martell@gmail.com> - 2014-02-13 03:30 -0500
            Re: Python programming John Ladasky <john_ladasky@sbcglobal.net> - 2014-03-07 10:03 -0800
              Re: Python programming Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-03-07 19:38 -0500
                Re: Python programming John Ladasky <john_ladasky@sbcglobal.net> - 2014-03-08 14:06 -0800
              Re: Python programming William Ray Wing <wrw@mac.com> - 2014-03-07 21:46 -0500
          Re: Python programming albert@spenarnc.xs4all.nl (Albert van der Horst) - 2014-03-06 02:51 +0000
            Re: Python programming Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-03-06 19:25 -0500
              Re: Python programming Roy Smith <roy@panix.com> - 2014-03-06 20:24 -0500
                Re: Python programming William Ray Wing <wrw@mac.com> - 2014-03-06 21:27 -0500
                Re: Python programming Larry Hudson <orgnut@yahoo.com> - 2014-03-06 23:56 -0800
                Re: Python programming Grant Edwards <invalid@invalid.invalid> - 2014-03-07 17:00 +0000
                Re: Python programming Gene Heskett <gheskett@wdtv.com> - 2014-03-07 12:49 -0500
  Re: Python programming Asdrúbal Iván Suárez <asdrubalivan.listas@gmail.com> - 2014-02-11 20:01 -0430
  Re: Python programming Ben Finney <ben+python@benfinney.id.au> - 2014-02-12 15:09 +1100
  Re: Python programming Larry Martell <larry.martell@gmail.com> - 2014-02-12 08:55 -0500
    Re: Python programming Roy Smith <roy@panix.com> - 2014-02-12 09:13 -0500
      Re: Python programming Larry Martell <larry.martell@gmail.com> - 2014-02-12 11:43 -0500
      Re: Python programming Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-02-12 21:13 -0500
  Re: Python programming Tim Delaney <timothy.c.delaney@gmail.com> - 2014-02-13 08:02 +1100
  Re: Python programming Chris Angelico <rosuav@gmail.com> - 2014-02-13 08:34 +1100
  Re: Python programming Tim Delaney <timothy.c.delaney@gmail.com> - 2014-02-13 09:57 +1100
  Re: Python programming Neil Cerutti <neilc@norwich.edu> - 2014-02-13 15:30 +0000
    Re: Python programming ngangsia akumbo <ngangsia@gmail.com> - 2014-02-14 12:29 -0800
    Re: Python programming 88888 Dihedral <dihedral88888@gmail.com> - 2014-03-05 20:05 -0800
  Re: Python programming Beowulf <offroad.adventures.engr@gmail.com> - 2014-03-05 20:19 -0800
    Re: Python programming Dan Sommers <dan@tombstonezero.net> - 2014-03-06 04:43 +0000
      Re: Python programming Roy Smith <roy@panix.com> - 2014-03-05 23:51 -0500
        Re: Python programming Grant Edwards <invalid@invalid.invalid> - 2014-03-06 14:49 +0000
    Re: Python programming Steven D'Aprano <steve@pearwood.info> - 2014-03-06 06:17 +0000
      Re: Python programming Tim Chase <python.list@tim.thechases.com> - 2014-03-06 07:09 -0600
        Re: Python programming Grant Edwards <invalid@invalid.invalid> - 2014-03-06 14:52 +0000

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