×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

#### Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

# Quantify Accuracy of Load Cell

## Quantify Accuracy of Load Cell

(OP)
Can't convince myself I'm doing this right.

10V excitation
Rated Output: 2mV/V

nonlinearity: .10%
nonrepeatability: .05%
hysteresis: .10%
zero balance: 1.0%

E* = sqrt(.002^2 + .001^2 + .002^2 + .02^2) = 0.02 mv/V accuracy
*those numbers represent error % * Rated Output in mV/V

if I have 25lb/20mV full output at 10V excitation,
then my accuracy in lb is (25lb/20mV)*.02 mV/V = +/- .25 lb accuracy.

Disregard my amp and DAQ for the time being, I am just trying to assess the sensor. Thank you for any feedback, I can never straighten this out in my head.

### RE: Quantify Accuracy of Load Cell

Specifically, the hysteresis and non-linearity are not random errors. Also not clear why you doubled the error values in the RSS sum.

### RE: Quantify Accuracy of Load Cell

xnuke
"Live and act within the limit of your knowledge and keep expanding it to the limit of your life." Ayn Rand, Atlas Shrugged.
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.

### RE: Quantify Accuracy of Load Cell

Ahh, I read that as percent error, thanks Irstuff. And yeah, zero balance...

#### Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

#### Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!