Instrumentation terminology

Instrumentation (English: instrumentation) Instruments are instruments or devices used to detect, measure, observe, and calculate various physical quantities, material compositions, and physical properties. Vacuum leak detectors, pressure gauges, length measuring instruments, microscopes, multipliers, etc. all belong to instrumentation. Broadly speaking, instruments and meters can also have functions such as automatic control, alarm, signal transmission and data processing. For example, pneumatic control instruments used in automatic control of industrial production processes, and electric adjustment instruments, and distributed instrument control systems also belong to Instrumentation.

Range
The range of one quantity defined by the upper and lower limits.
Note: "Range" usually includes modifiers. For example: measurement range, scale range. It can be applied to measured or working conditions.

Measuring range
The range of measurement to be measured is determined in accordance with regulations.

Measure range lower limit
The minimum value to be measured is determined on the basis of the required precision.

Measure range upper limit
The maximum value to be measured is measured in accordance with the prescribed accuracy.

Span span
The algebraic difference between the upper and lower limits of the range. For example, when the range is -20°C to 100°C, the range is 120°C.

Performance characteristics
Determine the relevant parameters of the instrument's instrument function and capabilities and their quantitative representations.

Reference performance characteristic reference performance characteristic
Performance characteristics achieved under reference working conditions.

Linear scale
The scale in which the interval between each grid in the scale is proportional to the corresponding grid value.
Note: A linear scale with a constant scale spacing is called a regular scale.

Nonlinear scale
Scales with scaled ratios between the scale grid spacing and the corresponding grid values ​​in the scale.
Note: Some non-linear scales have special names such as logarithmic scale, square law scale.

Zero-press scale suppressed-zero scale
The scale range does not contain the scale of the scale value corresponding to the zero value being measured. For example: the scale of a medical thermometer.

Extended scale expanded scale
Within the scale range, disproportionate expansion accounts for most scale length scales.

Scale
An ordered set of scale marks that form part of the pointing device and all related digits.

Scale range
The range limited by the scale start and end values.

Scale mark scale mark
A reticle or other marker on the indicating device that corresponds to one or more determined measured values.
Note: For digital indications, the numbers themselves are equivalent to scale marks.

Zero [scale] tag zero scale mark
Synonyms: Zero-scale lines.
A scale or scale line marked with a "zero" number on a dial (plate).

Scale division
The scaled portion between any two adjacent scale marks.

[$page] scale score value of scale division
Also called the grid value.
The difference between the measured values ​​corresponding to two adjacent scale marks in the scale.

Scale spacing, length of a scale division
The distance between the centerlines of any two adjacent scales measured along the same line segment representing the length of the scale.

Scale length scale length
On a given scale, the length of the line segment that passes through the midpoints of all the shortest marks between the start and end scale marks.
Note: This line segment can be a real or imaginary curve or straight line.