resistor help

[jack]

I've been trying to locate a specific resistor without any luck so
far,I'm wondering if any one has any leads on this. I'm looking for a
1 ohm , 1% tolerance, non inductive 10 watt or higher resistor.Most
of the websites have 1 or 2 of the requirements but not all. Any help?
thanks ahead. jk

 

[Terry]

jack wrote:

I've been trying to locate a specific resistor without any luck so
far,I'm wondering if any one has any leads on this. I'm looking for a
1 ohm , 1% tolerance, non inductive 10 watt or higher resistor.Most
of the websites have 1 or 2 of the requirements but not all. Any help?
thanks ahead. jk

You could probably make one?
For example standard 22AWG copper wire has a resistance of about
10.39 ohms per 1000 feet.
So 96 feet of that wound on something suitable such a ceramic
former (40 to 50 turns on a six inch form?) etc. would do?
Also if you have access to a Wheatstone bridge and a good quality
resistance standard you should be able to adjust the actual
resistance very closely to less than 1% by adjusting the end
connection or even adding/removing a turn/s?
Other alternative are thinner wire or two such 'home-made'
resistors in parallel (Does size/appearance matter?) Also how
many such resistors do you need; only one? Or for a production
run of hundreds?
Or you could use resistance wire from an electric heater? After
all a 1500 watt, 115 volt heater has an approximate resistance of
9 ohms!
However wire resistors may not meet your 'non inductive'
requirement, even if wound counter inductively? At what frequency
will it be operating? Or will inductive switching surges be
involved?
Ideas anyway?
PS. If space and reliability are limitations/requireemnts such as
in a space rocket the type of resistor could be very different to
something for a laboratory experiment. Also the
thermal/resitivity coefficient might be a factor since it will be
dissipating ten watts or more?

 

[John Fields]

On Thu, 02 Oct 2003 16:31:13 GMT, jack <road12fg@netscape.net> wrote:

I've been trying to locate a specific resistor without any luck so
far,I'm wondering if any one has any leads on this. I'm looking for a
1 ohm , 1% tolerance, non inductive 10 watt or higher resistor.Most
of the websites have 1 or 2 of the requirements but not all. Any help?
thanks ahead. jk

---
http://www.caddock.com


--
John Fields

 

[Baphomet]

"jack" <road12fg@netscape.net> wrote in message
news:uakonvkdlorpskd22nfh5nn1lmet1d45p5@4ax.com...

I've been trying to locate a specific resistor without any luck so
far,I'm wondering if any one has any leads on this. I'm looking for a
1 ohm , 1% tolerance, non inductive 10 watt or higher resistor.Most
of the websites have 1 or 2 of the requirements but not all. Any help?
thanks ahead. jk

These might get you in the ballpark

http://www.micro-ohm.com/highvolt/mv250.html

http://www.surplussales.com/Resistors/Res-NonIndList.html

 

[David Harmon]

On Thu, 02 Oct 2003 15:27:59 -0230 in sci.electronics.basics, Terry
<tsanford@nf.sympatico.ca> was alleged to have written:

You could probably make one?
For example standard 22AWG copper wire has a resistance of about
10.39 ohms per 1000 feet.
So 96 feet of that wound on something suitable such a ceramic
former (40 to 50 turns on a six inch form?) etc. would do?

But when recommending this please make sure to explain how to make
96 feet of wire wound on a former be non-inductive!

 

[John Fields]

On Thu, 02 Oct 2003 21:18:03 GMT, David Harmon <source@netcom.com>
wrote:

On Thu, 02 Oct 2003 15:27:59 -0230 in sci.electronics.basics, Terry
tsanford@nf.sympatico.ca> was alleged to have written:
You could probably make one?
For example standard 22AWG copper wire has a resistance of about
10.39 ohms per 1000 feet.
So 96 feet of that wound on something suitable such a ceramic
former (40 to 50 turns on a six inch form?) etc. would do?

But when recommending this please make sure to explain how to make
96 feet of wire wound on a former be non-inductive!

---
You wind it like a Moebius strip or use Ayrton-Perry windings.

--
John Fields