Aaron's Homepage Forum
Aaron's Homepage Forum
Home | Profile | Register | Active Topics | Members | Search | FAQ
Username:
 Password:
Save Password
Forgot your Password?

 All Forums
 Electronics
 Basic Electronics
 ohm measurement question		  New Topic  Reply to Topic
 Printer Friendly
Author Previous Topic Topic Next Topic  

e3nigma
Apprentece

16 Posts
Posted - Jul 04 2012 :  10:55:56 AM  Show Profile  Reply with Quote
Hey everyone what's up? Im wanting to build an ohm meter that will show show me each digit for ohms individually up to 100 meg ohms. For instance if the total resistance is 23,891,021 ohms then i want to see each digit. Not where it says its out of range for the hundreds or thousands. Any help is greatly appreciated. Thanks

pebe
Nobel Prize Winner

United Kingdom
1078 Posts
Posted - Jul 04 2012 :  10:59:38 AM  Show Profile  Reply with Quote
There is no way you can build an instrument with that degree of accuracy - let alone display it!
Go to Top of Page

josephcarlosgonzales
New Member

USA
1 Posts
Posted - Jul 10 2012 :  11:05:50 PM  Show Profile  Reply with Quote
i agree..,maybe youcan build an analog type but any digital type im afraid not
josephcarlos k gonzales
Go to Top of Page

Aaron Cake
Administrator

Canada
6718 Posts
Posted - Jul 14 2012 :  10:39:04 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
You'll probably be able to get that preceision (maybe jse a high bit ADC connected to a smartphone) but it won't be accurate.
Go to Top of Page

pebe
Nobel Prize Winner

United Kingdom
1078 Posts
Posted - Jul 14 2012 :  12:30:50 PM  Show Profile  Reply with Quote
No way will it be accurate. I don't know of any component that has a temperature coefficient better than 1 part in 2.38 x 10^7 over the ambient temperature range in a room. And then there's also the slight change due to warming as the component is being measured.

The high bit resolution A/D is only of benefit when comparing readings. It is only as accurate as its voltage reference.
Go to Top of Page

rafaelberinguela
New Member

1 Posts
Posted - Jul 15 2012 :  09:33:18 AM  Show Profile  Reply with Quote
yes i aggree with all your comments.
Go to Top of Page

kh07734
New Member

USA
1 Posts
Posted - Dec 19 2013 :  10:02:39 PM  Show Profile  Reply with Quote
The minutia involved in a design of that nature would require the assistance of some caltec students and perhaps a professor or two as well.....

I'll be checking back to see if you accomplished the task though.....
Go to Top of Page

n/a
deleted

1 Posts
Posted - Jan 18 2014 :  01:21:36 AM  Show Profile  Reply with Quote
Then there's also the slight change due to warming as the component is being measured.
GuL
Go to Top of Page

pebe
Nobel Prize Winner

United Kingdom
1078 Posts
Posted - Jan 18 2014 :  06:12:06 AM  Show Profile  Reply with Quote
quote:
Originally posted by chal4oye

Then there's also the slight change due to warming as the component is being measured.

Like I said!
Go to Top of Page
  Previous Topic Topic Next Topic  
 New Topic  Reply to Topic
 Printer Friendly
Jump To:
Aaron's Homepage Forum © 1995-2020 AARONCAKE.NET Go To Top Of Page
This page was generated in 0.08 seconds. Snitz Forums 2000