Timeline for Help on understanding how a strange RTD reading circuit works
Current License: CC BY-SA 3.0
11 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Apr 20, 2018 at 10:02 | vote | accept | hadez | ||
| Apr 20, 2018 at 8:25 | answer | added | Andy aka | timeline score: 1 | |
| Apr 20, 2018 at 8:24 | comment | added | hadez | @Neil_UK FYI, I am also redesigning the firmware and using another MCU. | |
| Apr 20, 2018 at 8:22 | comment | added | hadez | @Andyaka Boss has asked me to use this specific circuit. I've already designed RTD reading circuits myself and know many different methods to do this. But the current circuit has me baffled. | |
| Apr 20, 2018 at 8:19 | comment | added | hadez | @Neil_UK Yes that is the idea. I don't need the voltage/current reading section for my work so there is no need to waste $$$ on it. | |
| Apr 20, 2018 at 8:19 | comment | added | Andy aka | So, you are trying to design an RTD amplifier from the top down. Rules: find a circuit that might be good but overly complex and reduce, reduce until you are left with just the bits you want. Is your normal job a software engineer LOL? This isn't the way to tackle the problem BTW. | |
| Apr 20, 2018 at 8:17 | comment | added | hadez | @PlasmaHH Schematic added. I've already figured out how the circuit works and there is no need to go into a detailed explanation. I simply don't understand the RTD reading section with the two analogue switches and 4 resistors. | |
| Apr 20, 2018 at 8:16 | comment | added | Neil_UK | I'm planning on <strike>removing<\strike> destroying the circiutry that reads voltage and current and retain the thermocouple and RTD circuits. This can be easily achieved by removing the two MAX14763 analogue switches and directly connecting input pins 2 and 3 to the amplifiers. Go for it. Randomly remove components that the firmware expects to be using in ways you don't understand. Why remove anything if the board is expected to do what you want it to do? | |
| Apr 20, 2018 at 8:14 | history | edited | hadez | CC BY-SA 3.0 |
added schematic
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| Apr 20, 2018 at 7:51 | comment | added | PlasmaHH | You are talking about a circuit, resistors, certain ICs but we have no idea how it works since we don't have a schematic, how are we supposed to explain it? | |
| Apr 20, 2018 at 7:43 | history | asked | hadez | CC BY-SA 3.0 |