Introduction measurement systems Interfaces, Data Domain and Conversion
Uploaded by: Elena
On: 05 Jun, 2017
Viewed:503 times - 5 day, 10 hour, 18 minute, 18 second ago
Downloaded: 0 times -
In measurement systems the functions of signal transduction, conditioning. processing, and display are not always divided into physically distinct elements. Furthermore the border between signal conditioning and processing may be indistinct. But generally there is a need for some signal processing of the sensor output signal before its end use. Some authors use the term interface to refer to signal-modifying elements that change signals, even from one data domain to another, such as an ADC. These always operate in the electrical domain.
A data domain is the name of a quantity used to represent or transmit information. The concept of data domains and conversion between domains is very useful to describe sensors and electronic circuits associated with them [11. Figure 1.2 shows some possible domains, most of which are electrical.
In the analog domain the information is carried by signal amplitude (i.e., charge, voltage, current, or power). In the time domain the information is not carried by amplitude but by time relations (period or frequency, pulse width, or phase). In the digital domain signals have only two values. The information can be carried by the number of pulses or by a coded serial or parallel word.
The analog domain is the most prone to electric interference (see Section 1.3.1). In the time domain the coded variable cannot be measured, that is, converted to the numerical domain in a continuous way. Rather, a cycle or pulse duration must elapse. In the digital domain numbers are easily displayed.
The structure of a measurement system can be described then in terms of domain conversions and changes, depending on the direct or indirect nature of the measurement method.
A physical measurement is said to be direct when quantitative information about a physical object or action is obtained by direct comparison with a reference quantity. This comparison is sometimes simply mechanical, such as in a weighing scale.
In indirect physical measurements the quantity of interest is calculated by applying an equation that describes the law relating other quantities measured with a device, usually an electric one. For example, one measures the mechanical power transmitted by a shaft by multiplying the measured torque and speed of rotation.
As the fastest growing demand of circuit and wiring diagram for automotive and electronics on internet based on different uses such as electronic hobbyists, students, technicians and engineers than we decided to provide free circuit and wiring diagram base on your needed.
To find circuit and wiring diagram now a day its easy. E-learning through internet as a right place to search an exact circuit and wiring diagram of your choice and it's much fun and knowledgable. On internet you will find thousands of electronic circuit diagrams some are very good designed and some are not. So you have to modify them to make them according to your needs but some circuits are ready to make and require no changes.
There are many categories of circuit and wiring diagrams like automotive, audio circuits, radio & RF circuits, power supply circuits, light circuits, telephone circuits, timer circuits, battery charger circuits etc. There are many types of circuit and wiring diagrams some are very easy to build and some are very complicated, some are so small and some contain huge list of parts.
We provides free best quality and good designed schematic diagrams our diagrams are free to use for all electronic hobbyists, students, technicians and engineers. We also provides a full educational system to students new to electronics. If you are new to electronics you are a student or a electronic hobbyist and want to increase your knowledge in electronics or want to understand electronics in a very easy way so this is the right place for you we provide electronics beginner guide tutorials to easily understand complicated electronic theory. Our mission is to help students and professionals in their field.