Electrical Metrology (Source/Generation and Measurement)

fahimk

Involved In Discussions
#1
Hello

I am a beginner Metrologist. Can anybody help me understand difference between the Source/Generation and Measurement when it comes to stating the scope of electrical/frequency measurement in ranges etc?

Thanks.
 
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dwperron

Trusted Information Resource
#2
Hello

I am a beginner Metrologist. Can anybody help me understand difference between the Source/Generation and Measurement when it comes to stating the scope of electrical/frequency measurement in ranges etc?

Thanks.
This has been a point of confusion for a long time. The folks at A2LA have a guidance document (G118) that you can download at their web site that helps explain scopes of accreditation. Here is what they say about Source vs. Measure in a scope of accreditation:

Use of the word “generate”, “measuring equipment” and “measure” on scopes of accreditation.
Scopes of accreditation, particularly in the electrical field, currently use the word “generate” to describe a laboratory’s ability to generate a quantity with a certain level of uncertainty. For example, “DC Volts – Generate” has been taken to mean that a laboratory can generate one or several multiples and/or submultiples of a volt and that its representation of this quantity is accurate to within the claimed level of uncertainty. Thus, laboratories with this capability can calibrate devices used to measure DC Volts.

Although this usage is most prevalent in electrical scopes of accreditation, the same idea is not extended to other disciplines where the inadequacy of this concept for describing a laboratory’s calibration capabilities would not be clear. As such, the use of the “generate” term is only currently used for the electrical and microwave/RF disciplines in scopes of accreditation. Other considerations will be made on a case-by case basis upon written request from the laboratory.

For areas other than the electrical field, the phrase “measuring equipment” is used to describe the laboratory’s ability to generate a quantity with a certain level of uncertainty. In all fields, the use of the word “measure” is used to describe the laboratory’s ability to measure a quantity with a certain level of uncertainty. The three terms “generate”, “measuring equipment” and “measure” are used to define the capability of the laboratory for a measurement parameter and thus clarify what types of instruments they can calibrate
 
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