I want to calculate the resolution of load cell. I am using OBUG- 3 kg load cell. I attach it's specification. Would you please help me to find to resolution of this model. I attach the specification of digital indicator too.
Thanks.
Jamaleddin,
You are exciting the cell with 5V, and sensing the output with a resolution of 24 bits. If the ADC has an input range of 5V (not specified) then the LSB error is 0.3microvolts.
And what we now are lacking is a sensitivity value - how many Newtons of load yield one volt? You can deduce this figure by loading the cell with known masses and recording the output for a fixed excitation.
When you know that sensitivity, then you can convert the LSB error into a load.
Hello Jamal,
Pay attention to the specs for the rated loadcell output and the display counts of your indicator.
Let's assume that you have 2kg loadcell. Its output is specified for 1mV/V excitation meaning that if you have 5V excitation, you shall get 5mV output for a full-scale load of 2kgs. Simply correlate this as 5000uV (microvolts) corresponding to 2000gm of load.
Next, your digital indicator has a full-scale input span of +/-20mV to give you a count of +/-20,000 meaning it will have a resolution of 1uV (microvolt).
I hope that this explanation clarifies your doubts.
Thanks!
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