Measuring instruments

Measuring instruments

1. Definition

   • A measuring instrument is a device to measure a physical quantity. In the physical sciences, quality assurance, and engineering, measurement is the activity of obtaining and comparing physical quantities of real-world objects and events. Established standard objects and events are used as units, and the process of measurement gives a number relating the item under study and the referenced unit of measurement. Measuring instruments, and formal test methods which define the instrument's use, are the means by which these relations of numbers are obtained. All measuring instruments are subject to varying degrees of instrument error and measurement uncertainty. These instruments may range from simple objects such as rulers and stopwatches to electron microscopes and particle accelerators. Virtual instrumentation is widely used in the development of modern measuring instruments.
   • length measuring instruments
     • When we measure the distance between any two points in terms of width, thickness, depth, and height, we measure length. The standard instruments used nowadays to measure a length are – ruler, meter scale, measuring tape, vernier caliper, and screw gauge.
   • Mass measurement instruments
     • A measuring instrument is a device to measure a physical quantity. In the physical sciences, quality assurance, and engineering, measurement is the activity of obtaining and comparing physical quantities of real-world objects and events. Established standard objects and events are used as units, and the process of measurement gives a number relating the item under study and the referenced unit of measurement. Measuring instruments, and formal test methods which define the instrument's use, are the means by which these relations of numbers are obtained. All measuring instruments are subject to varying degrees of instrument error and measurement uncertainty. These instruments may range from simple objects such as rulers and stopwatches to electron microscopes and particle accelerators. Virtual instrumentation is widely used in the development of modern measuring instruments.
   • Instruments for measuring time
     • Time is measured using a mechanical, electric or atomic clock. The cesium atomic clocks are the most accurate. Atomic clocks use the frequency of electronic transitions in certain atoms to measure the second. The unit of time is second in SI units. It is defined as 9,192,631,770 cycles of the radiation that corresponds to the transition between two electron spin energy levels of the ground state of the 133 Cs atom.

2. instruments

   • Nonio
   • Test tube
   • clinical thermometer
   • chronometer
   • Ruler
   • micrometer
   • balance

3. Safety regulations when using measuring instruments

   • the safety measure in the laboratory that every student must follow when using measuring instruments are the following
     • 1. Think about what are doing, do it carefully and with the material and handling of the laboratory instruments that will bw used in the programmed practice. Pay attention to what the teacher points out of you. 2. Follow carefully the instructions of the instructions of the laboratory practice and the instruction manual of the measuring instruments. if you have any doubt about its use, consult it with you teacher. 3. within the laboratory you should wear the right clothes; safety glasess, gloves, grown or dust cover and everything your teacher tells you. 4. Do not drink or eat in the laboratory . 5.pay attention to the instructions of the teacher or laboratory assistant. 6. always keep the labortory clean and tidy ; save the material and equipment after use. 7. keepthe place where any instrument with electrical contscts perfectly clean and dry. Read the instructions for using the instruments.
       • 8. Your teacher or the personnel in charge of the laboratory should be superving the practice at all times and should never be absent from the laboratory (leave them alone).

Imágenes y archivos del mapa