1 Introduction
2 Quantities and units
3 Measurement
3.1 Measurement precision
3.2 Measurement trueness
3.3 Measurement accuracy
3.4 Measurement uncertainty
4 Methods (instruments for measurements)
5 Properties of measuring instruments (or devices)
Quantity | Dimension | Unit | Symbol |
---|---|---|---|
Length | L | Meter | m |
Mass | M | Kilogram | kg |
Time | T | Second | s |
Current | I | Ampere | A |
Temperature | Θ | Kelvin | K |
Amount of substance | N | Mole | mol |
Luminous intensity | J | Candela | cd |
Force | ML T−2 | Newton | N |
Pressure | ML− 1T− 2 | Pascal | Pa |
Work or energy | ML2T− 2 | Joule | J |
Power | ML2T− 3 | Watt | W |
Frequency | T− 1 | Hertz | Hz |
Measurements (facts)
| |||
---|---|---|---|
Quality | Quantity | Numerical value | Correction |
Measurements precision | Random error | MV: σ, 2σ, 2σ/mean | – |
Measurements trueness | Systematic error | Bias = AMV - R | – |
Measurement accuracy | Measurement error | MV-R | – |
Instruments (methods)
| |||
---|---|---|---|
Property | Quantity | Numerical value | Correction |
Instrumental precision | Random error | IV: σ, 2σ, 2σ/mean | Signal/noise |
– | Systematic error | Bias = AIV-R | Zero, offset |
Sensitivity | ΔIV/ΔR | Signal, gain | |
Linearity | ΔIV/ΔR = constant | Signal, gain | |
Resolution/step time response | Linked to SEM of IV | Signal, gain |