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Definition
| comparison of an unknown quantity with a standard assumed to remain constant |
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Term
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Definition
| characterization of a phenomenon or property in terms of a functional relationship between measured quantities and quantities that are accessible for measurement |
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Definition
device that converts one form of energy into an electrical signal
Active (create their own energy)and passive
energy drawn from measured system <= 1/100 measuring energy |
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Definition
| how close a measured value is to the real value |
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Definition
how closely a measured value clusters around a best estimate of the real value
small std deviation, but can have low accuracy |
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Definition
level or amplitude of the smallest change in measured value
relationship between the minimum instrument step size and the full scale output |
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Definition
| minimum change in input that causes a change in output |
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Definition
agreement between measurements taken under identical conditions
1% of Full Scale output |
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Term
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Definition
| agreement between measurements of the same phenomenum |
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Definition
| difference in output between measurements of increasing and decreasing input |
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Definition
| deviation of a response curve (or calibration curve) from a straight line, given in +- % FSO |
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Definition
| degree of correspondence between nonlinear input/output relationship and theoretical curve |
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Definition
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Term
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Definition
| Power Source -> Amplifiers -> Filters |
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Term
| Power Source Characteristics |
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Definition
operating mode (const Voltage or Current)
line and load regulation spec.
ripple on source (Voltage or Current)
zero suppression range
loading or stability |
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Term
| Amplifier Characteristics |
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Definition
Input electrical characteristics
Design type
Dynamic Parameters
Max input voltage and gain |
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Term
| Anti-Aliasing Filter Characteristics |
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Definition
Filter type (BEssel, Butterworth, Chebyshev)
Pass band or stop band parameters
Dynamic Parameters (settling time, overshoot) |
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Term
| Analog to Digital Converter (ADC) Characteristics |
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Definition
Conversion Technique (Digital Ramp, Successive Approximation or Flash)
Conversion Rate (points/sec)
Full Scale conversion voltage
Resolution (n = # of bits, resolution = (Voltage Difference)/2^n) |
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Term
| Zero Order Hold Circuitry |
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Definition
| holds signal constant during time the ADC takes to digitize an analog signal or convert digital to continuous |
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Term
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Definition
switch to connect N different sensor inputs to one data measuring equipment
Characteristics:
Switching rate
Cross-talk |
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Term
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Definition
Intrinsic: inherent within the measurement chain (hysteresis, accuracy, offset, noise, etc.)
Application Related: associated with the use of sensors (Spatial, Interaction, Probe, Temperature effects)
Interface: due to interfacing measurement chain components (Cabling, Loading, cross-talk, etc.)
Sampling and Approximation: due to discretization of analog signals (Finite time sampling, improper sampling rate, stabilization error, approximation error) |
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Term
| Numerical Integration Approximation |
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Definition
| Reinmann Sum, Trapezoidal, Simpson |
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Term
| Trapezoidal Rule Error Bound |
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Definition
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Term
| Midpoint Rule Error Bound |
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Definition
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Term
| Simpson's Rule Error Bound |
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Definition
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Term
| Measurement Error Components |
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Definition
Bias Error (related to the mean value or accuracy)
Random Error (related to the variation in data due to precision and resolution) |
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Term
| Measurement Probability and standard deviation |
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Definition
within 1 std deviation = 68.3%
within 2 std deviations = 95.4%
within 3 std deviations = 99.7% |
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