FAQs
FAQs Areas
Random FAQs
- There is no fixed period for the validity of a calibration certificate - it is not like your cars MOT certificate. However, measurement results stated on certificates are usually 'on the day' values and no allowance is made for subsequent drift.
- This relates the different quality mixtures to each other.
- When converting between pressure units consideration should be given to the number of significant figures to use, bearing in mind that many of the underlying conversion factors are not themselves exact and cannot be made so.
- UKAS is the United Kingdom Accreditation Service.
- There are many different types of barometer but they fit into two broad categories - those containing mercury and those that do not.
- Instrument calibration is often thought to be expensive but the information contained in the resultant certificate is usually worth considerably more. This is not always appreciated and, on receipt, many certificates are wastefully consigned to drawers, shelves or even wall plaques.
- To avoid ambiguity, when referring to a pressure value it is important to specify its mode.
- There are many types of force transducer and they are used with instrumentation of varying complexity. In designing or specifying a force measurement system for an application, it is useful to understand the basic operation of the transducer to be used and also their broad operating characteristics.
- Refer to our Good Practice Guide.
All FAQs
- Metrology is a service discipline - responding to a perceived need for a particular measurement accuracy, either now or in the near future.
- When converting between pressure units consideration should be given to the number of significant figures to use, bearing in mind that many of the underlying conversion factors are not themselves exact and cannot be made so.
- This is the responsibility of the European Parliament and the Council of the European Union.
- The variation in the value of g across the earth's surface is about 0.5 % due to latitude, plus a change of approximately 0.003 % per 100 m altitude. Local topography and tidal forces also can have small effects.
- The variation in the value of g across the earth's surface is about 0.5 % due to latitude, plus a change of approximately 0.003 % per 100 m altitude. Local topography and tidal forces also can have small effects.
- To calculate a pressure value using a liquid column - for example a mercury barometer - or a pressure balance it is necessary to know the gravitational acceleration at the location of the instrument. It can be determined by measurement on site, calculation or interpolation of measured values.
- There are many different types of barometer but they fit into two broad categories - those containing mercury and those that do not.
- Accurate measurement of thermal conductivity is not quite as straightforward as the simple steady-state theory would suggest.