Questions tagged [metrology]

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2answers
53 views

Is there an optical technology able to measure the temperature of dry air?

Optical IR sensors are able to measure the surface temperature of solids. But is there a range of the EM spectrum that can accomplish the same for measuring the temperature of nitrox (dry nitrogen, ...
1
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1answer
34 views

H6 tolerance shaft manufacturing

I’m a electrical engineer but an amateur in mechanics. I’ve been checking some tools and machines in the market for small works which would allow me to manufacture small but precise pieces, such as a ...
3
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3answers
739 views

Rule of Tens/Ten to 1 Rule in Measurement and Inspection

I'm trying to clarify my understanding about the requirements [read: best practices] for measurement resolution and measurement confidence. The "Rule of 10s" is a commonly tossed around guideline ...
3
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1answer
129 views

How does Rule-1 guarantee cylindriccity in GD&T?

If I have defined the size tolerance of a shaft, how is the maximum cylindricity tolerance automatically specified by rule-1 of GD&T? I mean when a shaft shoulder diameter is defined (e.g. 33g6) ...
3
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2answers
599 views

Are there different Gauge standards out there?

It is my understanding that a mil is a one thousandth of an inch (1mil = 0.001”). Also, a mil is 25.4 microns, aka micrometers. Then, it is my understanding that Gauge is 100x mil (1mil-100Ga). I am ...
2
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1answer
3k views

What does “BSL Accuracy” mean?

An example is this pressure transmitter which has a BSL accuracy of 0.08%. I know the term "Best fit straight line" - BFSL. Is BSL just a short hand for this ("Best straight line")?
2
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1answer
42 views

Units for plasma etching of circuits: A (with degree symbol)/min

Background: I'm a statistician working with a design of experiments example regarding plasma etching of circuits, and unfortunately, the author does not define what is meant by the units used for the ...
10
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3answers
8k views

How do you determine the accuracy of a measurement device?

Lets say you have a measurement device of which you do not know the accuracy, and a reference measurement device. Both measure a variable $x$. The range of interest is $x_0<x < x_1$. How do you ...
1
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3answers
646 views

What is the name for a digital height measuring device?

What is the generic name of the electronic hand-held device that measures the relative height of two different points (altitude, etc.)? As an example, suppose I'm climbing a tree. I turn on the ...
4
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1answer
763 views

Uncertainty Calculation of LVDT displacement transducers for length measurement

I have to calculate the uncertainty of measurement for an LVDT Linear displacement transducer used for measuring length. Uncertainty calculations are ruled by ISO 17025 but there are no (at least ...
3
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2answers
221 views

How to automatically process energy meter data considering outliers and meter reset?

I want to algorithmically process energy meter data. The energy meter measures a heat or power producer or a heat or power consumer (but not both, so the measured energy will always have a positive ...
5
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1answer
634 views

How to measure a laser diode's Wavelength

I have some laser diodes. I want to know how to measure the wavelength of laser diodes ranging from visible to near infrared? (300 nm to 1100 nm) What type of instrument/meter do I need to use? ...
3
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1answer
249 views

Is a building story actually 10ft (3m)?

In common US usage, the heights of tall things are sometimes converted to a "number of stories". The thinking is that people can better compare heights to similar tall buildings that they might have ...
2
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1answer
377 views

Dead weight pressure tester for very low positive pressures

Does the dead weight tester technology provide capability for an accurate, low pressure calibration standard in the range of zero to 150 cm H2O, and if so is there a manufacturer that provides such an ...
4
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1answer
96 views

Communicating losses and imprecision in liquid measurement by analogy

I'm writing a presentation for people and I need an analogy to convey the following problem: Person A wants to sell a liquid, so he fills a tank, measures volume and sends to Person B. Now Person ...