Monitor - ISSN 1472-0221
The Newsletter for PC-Based Data Acquisition and Control
Issue 237, May 2018
Welcome to Monitor, the data acquisition newsletter. Any comments or questions email [email protected].
You can download this issue as a pdf file from http://www.windmill.co.uk/monitor/monitor237.pdf.
Web link: windmill.co.uk/isolation-protection.html
In a computerised measurement and control system, a high transient voltage at one input may damage not only the input circuit, but the rest of the data acquisition hardware and, by propagating through the signal conditioning and analogue-to-digital circuits, eventually damage the computer system as well. You can prevent this type of damage by isolating the input from the earth of the data acquisition and computer hardware.
A transient at one input can also propagate across to other input circuits and then cause damage to other equipment connected to those inputs. To prevent this provide isolation between inputs.
Another case where you may need isolation is if you have very large ground loops. These may occur when the computer and DAQ equipment are widely separated.
Isolation is a special case of input protection. Inputs may be protected using components to limit the voltage at an input circuit.
Electrical equipment that may be subject to switching transients, component failure, mis-wiring and so on should only be connected to isolated inputs. So a system used to test electrical equipment following manufacture would be a prime candidate for isolation.
For more information about when and how to use isolation please get in touch.
"Does your charting allow different values to be trended together? e.g. Speed maybe is 0 to 20,000rpm and electrical current is 0 to 10amps. Obviously if only one scale is available then one can not be seen easily (too small). In excel there is a primary and secondary Y axis so 2 but some softwares have many Y scales i.e. set independently depending on parameter/channel. And also can I trend historical information or only real-time?"
Yes, different values can be trended together on up to eight different axes. Chart doesn't show historical information - you can use the Windmill Replay program to do this - or Excel (as detailed here).
Chart is provided free with all our hardware systems. Read more about Chart.
The quarterly update of data acquisition and control exhibitions around the world.
4-7 June 2018
To discuss and identify emerging trends and technologies that will impact the future.
19-22 June 2018
Exhibition for smart automation and robotics
Sensors Expo & Conference
26-28 June 2018
The measurement fair.
Sensor and Test
26-28 June 2018
San Jose USA
Event dedicated to sensors, connectivity and systems
4-5 July 2018
Exhibition for sensors and transducers, control and data acquisition.
1-4 August 2018
Industrial automation exhibition.
Automation Expo 2018
29 August - 1 September 2018
Asia's leading automation and instrumentation exhibition
Transparent Eel-like Robot Swims Silently Underwater
A step toward a future when soft robots can swim in the ocean alongside fish and invertebrates without disturbing or harming them.
Source: SCUBA Travel
Scientists discover new magnetic element
The chemical element ruthenium (Ru) is the fourth single element to have unique magnetic properties at room temperature. The discovery could be used to improve sensors and other devices using magnetic materials
Source: University of Minnesota
The Secret Lives of Roots: Watching Crops Grow Beneath the Surface
Ambitious program to reveal the secret lives of roots that includes using magnetic resonance imaging (MRI) of living plants in the field.
Magnetic navigation techniques borrowed from birds could help drones find their way
One of the magnetic navigation techniques thought to be used in the natural world could help enable autonomous vehicles find their way without maps or GPS..
Source: The Engineer
Self-repairing circuits a possibility with new material
Autonomously self-healing material said to be a breakthrough for soft-matter electronics.
Source: Carnegie Mellon University
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