Electronic Insturmentation - Unit 1

Accuracy of an instrument refers to:

• The ability to reproduce the same reading repeatedly
  

• The closeness of a measured value to the true value
  

• The smallest change in input that can be detected
  

• The maximum measurable quantity

Precision means:

• Closeness to the true value
  

• Zero error in measurement

• High sensitivity
  

• Reproducibility of results
  

Sensitivity of an instrument is defined as:

• Reproducibility of readings

• Smallest input that can be detected
  

• Ratio of output signal to input signal
  

• Range of measurable values
  

Resolution of an instrument refers to:

• Least count or smallest change detected in input
  

• Maximum range available

• Ratio of measured to actual value
  

• Accuracy of measurement
  

Range of an instrument is:

• Sensitivity of the scale

• Accuracy of the instrument
  

• Difference between maximum and minimum measurable values
  

• Minimum detectable value
  

The main function of a multimeter is to measure:

• Frequency only

• Power only
  

• Voltage, current, resistance
  

• Only voltage
  

A block diagram of a digital multimeter includes:

• Transformer, Rectifier, Pointer
  

• ADC, Display unit, Range selector
  

• Oscilloscope, Amplifier, Pointer
  

• None of these

A DC voltmeter works on the principle of ------------

A 3½ digit digital multimeter can display a maximum reading of:

• 1999

• 2999

• 3999

• 9999

A 4½ digit digital multimeter has a maximum display of:

• 1999

• 3999

• 99999

• 19999