Static & Dynamic Characteristics

Question 1

Accuracy

Answer 1

difference between the true value and measured value divided by the true value

Question 2

Precision

Answer 2

expresses the number of distinguishable alternatives from which a given result is selected

Question 3

Resolution

Answer 3

smallest incremental quantity that can be measured with certainty

Question 4

Reproducibility

Answer 4

ability of an instrument to give the same output for equal inputs applied over some period of time

Question 5

Static Calibration

Answer 5

1. all inputs constant except 1
2. the one non-constant input is varied incrementally over normal operating range
3. Static sensitivity: ratio of the incremental output quantity to the incremental input quantity

Question 6

Zero Drift

Answer 6

occurs when all output values increase or decrease by the same absolute amount

Question 7

Sensitivity Drift

Answer 7

slope of the calibration curve changes as a result of an interfering and or modifying input

causes error proportional to the magnitude of the input

Question 8

Input Impedance

Answer 8

how much effort does it take to get the electrical signal to flow from the body interface to the sensor

we want to make input impedance as large as possible (or as small as possible if measuring flow variables) to minimize the power needed to measure the measurand