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I am working with a 50kg load cell. In the datasheet(https://www.sparkfun.com/datasheets/Sensors/loadsensor.pdf), the creep is defined by (3min)%FS. What does it mean?

leoperassoli
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  • It means the creep, (the amount the reading changes) measured over 3 minutes, will be within that value. You're probably better finding out the components Sparkfun are selling, and going to the original source's datasheet. –  May 29 '18 at 23:52
  • I dont think I got it. Does the information help me to "predict" the change? – leoperassoli May 30 '18 at 00:40
  • No, it allows you to predict upper and lower bounds on the change. –  May 30 '18 at 00:55
  • No. The datasheet doesn't tell you the exact amount it will change (creep). It could be zero, or it could be +/- 0.3% of fullscale reading after three minutes. – user57037 May 30 '18 at 00:57
  • Similar to this: https://electronics.stackexchange.com/questions/106143/does-this-loadcells-creep-mean-that-i-can-not-let-a-constant-load-on-the-loadce?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa question – Spehro Pefhany May 30 '18 at 01:07

1 Answers1

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The are all errors: offset (zero) and gain errors relative to FS.

Nonlinearity %FS              0.03%
Repeatability %FS             0.03%
Hysteresis %FS                0.03%
Creep (3min)%FS               0.03%
Zero Drift (1min)%FS          0.03%
Temp. Effect on Zero %FS/10℃  1% or 0.1%/'C 3min
Temp. Effect on Output %FS/10℃ 0.05% or 0.05%/'C

It stretches ( creep ) under load but returns back with hysteresis and return creep. It is the error due to slight plasticity material properties, rather than pure elastic stiff spring of the load cell. After all the ideal strain gauge is a pure spring resistor bridge.

Total Gain error    0.12% FS + 0.05%/'C 
Total Offset error  0.03% FS + 0.1% FS/'C
Tony Stewart EE75
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  • "Another silent -1 afraid to voice their ignorance" Sorry, I didn't get it – leoperassoli Jun 05 '18 at 13:40
  • someone who thinks their opinion is worth something , but isn't, down-voted it -1 without comment or question. This serves to notice them that I don't care but they ought to be ashamed – Tony Stewart EE75 Jun 05 '18 at 16:09