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| daq-and-datalogging:documents:measuring-current-transducers-with-daq [2023/07/11 05:28] – Scandiweb | daq-and-datalogging:documents:measuring-current-transducers-with-daq [2023/07/27 21:30] (current) – Arthur Brown | ||
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| - | ====== TechTip: ====== | + | ====== TechTip: |
| - | ===== Measuring 4-20 mA Current with MCC DAQ ===== | + | **Introduction**\\ |
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| - | Introduction\\ | + | |
| The 4-20 mA current loop interface came about because of the need to transmit information over long distances. System designers found that instead of a changing a voltage signal [that is susceptible to noise and voltage drops along the wires] they could transmit a changing current with little downside. For the most part, the information is simply a measurement or a value to control something. For instance, a factory process may need to transmit a pressure value up to the control room that is hundreds of feet away. Likewise, the control room my need to adjust the pressure by sending back a 4-20 mA signal to the pressure controller that is also hundreds of feet away. | The 4-20 mA current loop interface came about because of the need to transmit information over long distances. System designers found that instead of a changing a voltage signal [that is susceptible to noise and voltage drops along the wires] they could transmit a changing current with little downside. For the most part, the information is simply a measurement or a value to control something. For instance, a factory process may need to transmit a pressure value up to the control room that is hundreds of feet away. Likewise, the control room my need to adjust the pressure by sending back a 4-20 mA signal to the pressure controller that is also hundreds of feet away. | ||
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| Also care should be taken as to where in the loop the measurement is made. If the DAQ input is sensitive to common mode voltage then put it as close to ground as possible. Elsewhere in the loop the inputs will have 5 or more volts of common mode. Isolated inputs work best in this case. | Also care should be taken as to where in the loop the measurement is made. If the DAQ input is sensitive to common mode voltage then put it as close to ground as possible. Elsewhere in the loop the inputs will have 5 or more volts of common mode. Isolated inputs work best in this case. | ||
| - | More Information\\ | + | **More Information**\\ |
| - | Please | + | Please |
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| - | Knowledgebase: [[https://kb.mccdaq.com/Default.aspx | kb.mccdaq.com]]\\ | + | Additional TechTips are available |
| - | Phone: 508-946-5100\\ | + | |
| - | Fax: 508-946-9500\\ | + | |
| - | Additional TechTips are available | + | |