Question

When scaling a 4-20mA analog signal to a 0-100 engineering range, what is the raw binary integer value at the 12mA midpoint, assuming a standard 12-bit analog-to-digital converter?

Accepted Answer

A 12-bit analog-to-digital converter provides a resolution of 4096 discrete steps, ranging from a binary value of 0 to 4095. In a standard industrial 4-20mA loop, the 4mA signal represents the zero-point and the 20mA signal represents the full-scale point. Because 12mA is exactly the midpoint between 4mA and 20mA, it represents 50 percent of the signal range. To find the raw binary integer value, you calculate 50 percent of the total available steps. Since the range 0 to 4095 contains 4096 total values, the midpoint value is calculated as 4096 divided by 2, which equals 2048. Therefore, the raw binary integer value at the 12mA midpoint is 2048.

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When scaling a 4-20mA analog signal to a 0-100 engineering range, what is the raw binary integer value at the 12mA midpoint, assuming a standard 12-bit analog-to-digital converter?

A 12-bit analog-to-digital converter provides a resolution of 4096 discrete steps, ranging from a binary value of 0 to 4095. In a standard industrial 4-20mA loop, the 4mA signal represents the ze....