How Does A Digital Scale Work?

Strain gauge technology is the process of taking the weight of an item, evenly distributing that weight, and then applying the force of that weight to one end of a load cell. As weight is applied to the end of the load cell (which has an electrical charge) the cell will bend downwards changing the electrical resistance. This electrical resistance is run through an analog to digital converter and is then passed to a microchip which does the calculations for the LCD display.

So how does this strain gauge load cell work?

New Weighmax 75Lb Scale

This is a brand new Weighmax Xtro 75 scale, right out of the box.

 

Scale With Tray Removed

Here we have removed the stainless steel tray. Notice the four black dots on the inside pan? They are spaced at the four corners to evenly distribute the weight across the tray. Also take note of the two screws near the center. These screws attach to the load cell.

 

Viewing the top of the load cell.

Here we have removed the inside pan. See how there is a metal block on the right end of the load cell? This block takes all the weight placed on the scale and applies the force to the right side of the load cell.

 

Viewing the load cell

Here we have removed the final cover of the scale to get a good look at the load cell. Remember the metal block that was on the right hand side of the load cell? Notice how there is nothing UNDER the right side of the load cell? What they have done is effectively distribute the entire weight on the scale onto the right side of this load cell, which has nothing under it. As more pressure is applied on to the top of the scale, the right end of this load cell will drop lower and lower.

 

The scale's microchip

The analog signal generated by the load cell is passed into this microchip and converted into a digital signal that can be displayed on the LCD display.

 

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