In the case of load cell calibration how is the value of shunt resistor defined? Does it depend on the capacity of the load cell?
It’s not a function of load directly, the shunt resistance for calibration of a load cell is dependent on the strain gauge bridge resistance and the output sensitivity of the load cell.
Consider two load cells which have a range of 1000 newtons and 5000 newtons, if they both have the same output sensitivity of 3mV/V, the shunt resistance would be the same for both despite there differing maximum load.
For example, if you have a bridge with a 350 Ohm resistance, supplied with 10Vdc that requires a 3mV output representing full range load, the shunt resistor connected between “Supply Negative” and “Output Negative” would need to be 291841.6667 Ohms in order to simulate the output at maximum load.
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