Exam 1

Question 1

Accuracy

Answer 1

The deviation from a known input as % of full scale

Question 2

Readability

Answer 2

Closeness of Scale

Question 3

Least Count

Answer 3

The smallest unit that can be detected

Question 4

Sensitivity

Answer 4

Output/Input(measured)

Question 5

Precision

Answer 5

The ability to reproduce a certain reading with a given accuracy(repeatability)

Question 6

Calibration

Answer 6

-Can improve accuracy up to the precision
-Test/check the instrument against known standards

Question 7

Resolution

Answer 7

The smallest unit of the quantity under measurement that can be reliably detected

Question 8

accuracy error

Answer 8

The value of a measured value minus known value

Question 9

precision error

Answer 9

The value of one reading minus the average readings

Question 10

Significant Digits

Answer 10

Digits that are relevant and meaningful

Question 11

NIST

Answer 11

-National Institute of Standards and Technology
-Maintains standards in the US
-Standards: Common Units

Question 12

3 Stages of a sensor

Answer 12

1) Detector (sensor stage)
2) Intermediate: Amplifier/Filter
3) Final/Terminating Stage (record/readout)

Question 13

Noise

Answer 13

Unwanted Data
1) Measurement Noise: Noise caused by measurement procedures
2) Noise part of the process dynamics (determined by the type of measurement)

Question 14

Types of Measurement Noise

Answer 14

1) Environmental
2) Electrical Signal Conditioning System
3) Quantization Noise

Question 15

Analog

Answer 15

Signal is analogous to a continuous physical process

Question 16

Digital

Answer 16

Digital Signal is a set of discrete numbers

Question 17

Static vs Dynamic

Answer 17

1) Static: Constant in Time
2) Dynamic: Varying in Time

Question 18

Measurement Errors

Answer 18

-Total error in a set of measurements obtained under controlled or fixed conditions
1) Systematic Errors: Will shift the sample mean from the true mean by a fixed amount
2) Random Errors: Cause a distribution of measured values about the sample mean

Question 19

Rise Time

Answer 19

The time to from 10 to 90% of full scale

Question 20

Complete Response

Answer 20

5 Time Constant

Question 21

Thermocouple

Answer 21

A measurement device that measures a delta V because of a change in temperature
-A junction between two dissimilar metal wires

Question 22

Thermopiles

Answer 22

Multiple-Junction thermocouple circuits

Question 23

Resistance Temperature Detector(RTD)

Answer 23

A measurement device that measured the change in resistance due to a change in temperature

Question 24

Low Pass Filter

Answer 24

A filter that allows low-frequency signals to pass

Question 25

High Pass Filter

Answer 25

A filter that allows high-frequency signals to pass

Question 26

Full Scale

Answer 26

Final-Initial Value

Question 27

Cyclic Time

Answer 27

Time to reach Steady-State

Question 28

Linearity Error

Answer 28

The max deviation of the curve from linearity

Question 29

sensitivity error

Answer 29

departure from ideal slope of the curve