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Research draft

measuring instrument

vr.tr.measuring-instrument · PHY.OBJ

Let an agent handle measuring instruments by quantity, principle, accuracy, calibration and legal metrology.

Thing Registry Physical world and living systems

Research draft, second pass

A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.

written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify

Researched by: Claude

Purpose and description

Let an agent handle measuring instruments by quantity, principle, accuracy, calibration and legal metrology.

A device for measuring a physical quantity, such as rulers, scales, thermometers, anemometers, water level recorders, loading gauges and counting machines, characterised by range, resolution and accuracy.

What it is for: Obtaining reliable measurements for science, trade, safety and daily life.

It can be choose an instrument for a measurement; calibrate and verify it; estimate uncertainty; check legal requirements for trade use.

Distinguishing features

Measures a quantity

Has range, resolution and accuracy

Needs calibration

Regulated when used for trade

What it looks like

Gauges, meters, scales, rules and sensors with displays or scales.

How it is recognised

Quantity measured and range

Calibration labels and certificates

Historical instruments such as nilometers

Related models

is a kind of - category

measurement tool

measures - object

physical quantity

is calibrated against - traceability

measurement standard

is regulated by - rules

legal metrology

In practice

Families and kinds

length and dimension instruments

mass and force instruments

temperature and pressure instruments

flow and level instruments

electrical instruments

Standards and regulation

EU Measuring Instruments Directive 2014/32/EU

ISO/IEC 17025 for calibration labs

OIML recommendations

JCGM GUM on uncertainty

Failure modes and hazards

Out-of-calibration readings

Using instruments beyond their range

Ignoring uncertainty

Also called

nilometerwater level recorderanemometer mastlimnigraphloading gaugecounting machinechart recorderradiometerbarographanemogramhygrographAdvanced Baseline ImagerEarth Radiation Budget ExperimentCrookes radiometerMicrowave Electrojet MagnetogramAdvanced Himawari ImagerAdvanced Meteorological Imagermultispectral infrared radiometerVisible Infrared Imaging Radiometer Suiteinfrared interferometer spectrometer and radiometermicrowave radiometerspectroradiometerPOLDERSBUV/2pyrheliometerAdvanced Technology Microwave SounderAdvanced Microwave Sounding UnitAMSRMicrowave Sounding Unitactive cavity radiometerActive Cavity Radiometer Irradiance Monitorspectrometercentring angletree caliperneutron spectrometerSolar Wind Spectrometerscintillation spectrometerX-ray spectrometerRaman spectrometerMultimode microplate spectrophotometer (reader)

+432

Where this came from

wikidata · CC0 1.0

Source repository Registry entry point

Also registered as vr.tr.measuring-instrument

Drafted structure

Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.

Instrument Which instrument.

Quantity decides type.

Quantity

What it measures.

Quantity

Measured quantity.

  1. What quantity does it measure, and over what range? definition
  2. What is its resolution? measurement

Principle

How it works.

Principle

Measuring principle.

  1. What principle does it use? definition
  2. What affects its readings? boundary
Quality Accuracy.

Accuracy must be known.

Calibration

Traceability.

Calibration

Calibration.

  1. When was it last calibrated, and by which lab? provenance
  2. Is the calibration traceable? provenance

Uncertainty

Error budget.

Uncertainty

Uncertainty.

  1. What is the measurement uncertainty? measurement
  2. How was it estimated? provenance
Use Correct use.

Use affects results.

Procedure

Method.

Procedure

Procedure.

  1. What procedure gives reliable results? action
  2. Which conditions must be controlled? boundary

Maintenance

Care.

Maintenance

Maintenance.

  1. How should it be stored and maintained? action
  2. When should it be replaced? boundary
Law Legal metrology.

Trade instruments are regulated.

Trade

Legal use.

Trade

Legal for trade.

  1. Is the instrument approved for trade use? provenance
  2. Does it carry the required marks? provenance

Verification

Inspections.

Verification

Verification.

  1. When is re-verification due? measurement
  2. Which authority does it? provenance

What the second pass must settle

  • Should instrument types be separate entries?
  • How should calibration records be linked?
  • How should historical instruments be linked?
Draft as JSON