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 4-20 Ma Calculator 4-20 Ma Formula: units = ( (Ma − 4 ) / 16) × ( Vmax − Vmin ) + Vmin

4-20 Ma Definition
This 4-20 mA calculator is used to calculate the original measurement of overall vibration (or other physical pressure) units, as determined by the user or type of transducer, using the output current of the 4-20 mA transducer as well as the minimum and maximum of the unit range for the device.
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How this Calculator Works
Transducers are used to convert a physical input into an analog electric signal. There are a wide variety of transducer types, including millivolt output transducers, voltage output transducers, and 4-20 mA output transducers. Of these options, a 4-20 mA signal is least likely to be affected by electrical resistance and noise in the transmission line. Because of that special property, 4-20 mA transducers are used when a signal must be transmitted a long distance through physical transmission lines.
The elements involved in this calculator are the transducer input units, the unit range, and the output current of the transducer. Input units, in this case indicated by “V”, are units for measuring vibrations or some other sort of physical input. The output of the transducer is an electrical signal to be sent down a transmission line and is measured in milliamps.
In the calculator, the following inputs are called for:
• Field 1 (mA): Output current as measured in milliamps from the 4-20 mA transducer
• Field 2 (Vmin): Minimum V, which is the bottom of the physical input range. This is in whatever units required by the calculation.
• Field 3 (Vmax): Maximum V, which is the top of the physical input range.

While the variable “Vmin” and “Vmax” can of any type of unit of measure you wish, the unit types must be the same. If they are not, the result of the equation will be inaccurate.

The formula used is:
Units = (Ma − 4 ) / 16) × ( Vmax − Vmin ) + Vmin

Interpreting the Results
After correctly filling out and submitting the fields, the result given by the calculator is output in whatever units the “Vmin” and “Vmax” were input by the user. The values of Vmin and Vmax will normally be determined by the manufacturer of the transducer being used and can be found either in the manual for the device or on the manufacturer’s website.