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The 4–20 mA convention was born in the 1950s out of the earlier highly successful 3–15 psi pneumatic control signal standard, when electronics became cheap and reliable enough to emulate the older standard electrically. The 3–15 psi standard had the same features of being able to power some remote devices, and have a "live" zero.
List of free analog and digital electronic circuit simulators, available for Windows, macOS, Linux, and comparing against UC Berkeley SPICE.The following table is split into two groups based on whether it has a graphical visual interface or not.
The HART Communication Protocol (Highway Addressable Remote Transducer) is a hybrid analog+digital industrial automation open protocol. Its most notable advantage is that it can communicate over legacy 4–20 mA analog instrumentation current loops, sharing the pair of wires used by the analog-only host systems.
The pneumatic control signals are traditionally based on a pressure range of 3–15 psi (0.2–1.0 bar), or more commonly now, an electrical signal of 4-20mA for industry, or 0–10 V for HVAC systems. Electrical control now often includes a "Smart" communication signal superimposed on the 4–20 mA control current, such that the health and ...
A digital current loop uses the absence of current for high (space or break), and the presence of current in the loop for low (mark). [1] This is done to ensure that on normal conditions there is always current flowing and in the event of a line being cut the flow stops indefinitely, immediately raising the alarm of the event usually as the heavy noise of the teleprinter not being synchronized ...
While there are strictly analog [2] electronics circuit simulators, popular simulators often include both analog and event-driven digital simulation [3] capabilities, and are known as mixed-mode or mixed-signal simulators if they can simulate both simultaneously. [4] An entire mixed signal analysis can be driven from one integrated schematic ...
NL5 DLL is an NL5 transient simulation engine with an API in the form of a Windows DLL. It can be used as an analog simulation engine for co-simulation with System Verilog digital simulators (e.g. Xilinx Vivado). Also, NL5 DLL functions can be called from C/C++ applications, MATLAB, Python, etc., and perform co-simulation with user's tool of ...
Widely used as the basis for many GUI-based programs on many platforms. Version 2 is open source, but Versions 3 and 4 are commercially licensed. Momentum: commercial Yes Yes Partial Yes Yes equidistant MoM: For passive planar elements development, integrated into Keysight EEsof Advanced Design System. Ansys HFSS: commercial Yes Yes Yes Yes Yes
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