MODULE 4: Performance Characteristics

Question 1

Examples of performance characteristics.

Answer 1

• accuracy
• precision
• resolution
• sensitivity

Question 2

Allows the user to select the most suitable instrument for a specific measuring jobs.

Answer 2

Performance characteristics

Question 3

Types of performance characteristics.

Answer 3

• Static characteristics

* Dynamic characteristics

Question 4

Describes performances at room temperature conditions with very slow changes in measurement quantities.

Answer 4

STATIC CHARACTERISTICS

Question 5

Defines as the characteristics describing the relationship between specified points when system variables are not changing.

Answer 5

STATIC CHARACTERISTICS

Question 6

Refers to the behavior between the time that the input value changes and the time that the value given by the system or elements settles down to the steady state value.

Answer 6

DYNAMIC CHARACTERISTICS

Question 7

Static characteristics:

Answer 7

• ACCURACY
• PRECISION
• REPEATABILITY
• REPRODUCIBILITY
• SENSITIVITY
• RESOLUTION/DISCRIMINATION
• STABILITY
• RANGE/SPAN
• THRESHOLD
• OUTPUT IMPEDANCE
• OFFSET
• DRIFT

Question 8

The degree of exactness (closeness) of measurement compared to the expected (desired value).

Answer 8

ACCURACY

Question 9

Is an indicator of how close the value given by the measurement system can be expected to be to the true value.

Answer 9

ACCURACY

Question 10

Measure of consistency or repeatability of measurement, i.e. successive reading do not differ.

Answer 10

PRECISION

Question 11

The ability of measurement system to give the same value for repeated measurements of the same value of variable.

Answer 11

REPEATABILITY

Question 12

The ability of the system to give the same output when used with a constant input with the system or elements of the system being disconnected from its input and then reinstalled.

Answer 12

REPRODUCIBILITY

Question 13

Indicates how much the output of an instrument system changes when the quantity being measured changes by given amount.

Answer 13

SENSITIVITY

Question 14

Defined as the smallest change in the input signal that will cause a readable change in the output of the measuring system at its operating point.

Answer 14

RESOLUTION / DISCRIMINATION

Question 15

The ability to give the same output when used to measure a constant input over a period of time.

Answer 15

STABILITY

Question 16

The range of variable system is the limits between which the input can vary.

Answer 16

RANGE / SPAN

Question 17

It is the minimum input for which the will be an output. Below this minimum input, instrument will read zero.

Answer 17

THRESHOLD

Question 18

It is the smallest measurable input or first detectible output change.

Answer 18

THRESHOLD

Question 19

The impedance across the sensor when it is giving electrical output.

Answer 19

OUTPUT IMPEDANCE

Question 20

The reading of an instrument with zero input.

Answer 20

OFFSET

Question 21

The change in the reading of an instrument of a fixed variable with time.

Answer 21

DRIFT

Question 22

Is used for the difference between the result of the measurement and the true value of the quantity being measured.

Answer 22

M. ERROR

Question 23

MEASURED VALUE—TRUE VALUE

Answer 23

ABSOLUTE ERROR

Question 24

(MEASURED VALUE — TRUE VALUE) / (TRUE VALUE)

Answer 24

PERCENT ERROR

Question 25

Characteristics that show the performance of an instrument.

Answer 25

Performance characteristics