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A simplified schematic for the voltage to current converter is shown in Figure 2. This design is commonly referred to as a loop-powered, or 2-wire, 4-20 mA transmitter. The transmitter has only two external input terminals; a supply connection and a ground, or return, connection.
9 lis 2020 · Now we’ve covered most the key accepts related to 4-20mA current loop technology and the requirements for our test jig. Now we will deep dive into the finer details of our design. Figure 8 shows the schematic of my programmable 2-wire 4-20mA current transmitter test board. Figure 9 shows a photo of the board assembly.
This reference design explains how to develop a 4–20mA current-loop transmitter, analyze its performance, and select the components that meet rigorous industrial requirements. Test data for error analysis, overtemperature characterization data, schematics, and analysis software are provided.
12 kwi 2018 · You can use an OpAmp as an ajustable current regulator to make a simple tester. There is an example in the LM10 data sheet. The LM10 is an OpAmp and voltage ref in a package. Pretty handy. http://www.ti.com/lit/ds/symlink/lm10.pdf.
19 lip 2017 · The most common standard is the 4-mA-to-20-mA current loop, and here we’ll take a look at how it came to be, how it works, and how you can leverage this basic process control...
Burr-Brown now offers all of the integrated circuit building blocks needed to assemble com-plete isolated 4-20mA current-loop systems. The product line includes two-wire transmitters, two-wire receivers, low cost isolation amplifiers, and low cost isolation power sup-plies.
Figure 1. Robust Loop Powered Configurable Transmitter Circuit with 4 mA-to-20 mA Output. The design is optimized for precision, low noise and low power industrial process control applications. The circuit can accept 0 V to 5V or 0 V to 10 V input range as a transmitter.
