Many of the following technical specifications appear on datasheets for pressure transducers and similar devices. Here we review their technical definitions and relationships.
Root Sum Squares (RSS): accuracy of a pressure transducer is calculated by taking the square root of non-linearity + hysteresis + non-repeatability.
[Non-Linearity: (±0.1%)2 = 0.01%] + [Hysteresis: (±0.05%)2 = 0.0025%] + [Non-Repeatability: (±0.02%)2 = 0.0004%] = 0.0129%
√0.0129% = ±0 .11% FS at constant temperature
The relationship of a calibration curve to a specified straight line.
Thermal Zero Shift: < +/- 0.004%/°F (0.0072%/°C)
Thermal Span Shift: < +/-0.003%/°F ( 0.0054%/°C)
Example: Temp Range -10°F to +130°F ( -23°C to +55°C)
Max temp. change from 70°F (21°C) = 80°F (44°C)
80°F X .004%/°F = .32% FS DZ/DT
or 44°C X .0072%/°C = .32% FS DZ/DT
80°F X .003%/°F = .24% FS DS/DT
or 44°C X .0054%/°C = .24% FS DS/DT
CLICK HERE to learn more about how to calculate Total Error Band (TEB).