Paper 9

Paper 9: Basic Instrumentation

OLD CBCS DSE 4 (Alternative to Project of 6th Sem)

Syllabus

Core IX: Basic Instrumentation (Different measurement of electronic circuit with measuring devices, CRO and its applications, signal generators and its analysis, digital instruments and their applications.)

Unit I
  • Basic of Measurement: Instruments accuracy, precision, sensitivity, resolution range etc. Errors in measurements and loading effects.
  • Multimeter: Principles of measurement of dc voltage and dc current, ac voltage, ac current and resistance. Specifications of a multimeter and their significance.
  • Electronic Voltmeter: Advantage over conventional multimeter for voltage measurement with respect to input impedance and sensitivity. Principles of voltage, measurement (block diagram only). Specifications of an electronic Voltmeter/ Multimeter and their significance.
  • AC milli voltmeter: Type of AC milli voltmeters: Amplifier-rectifier, and rectifier-amplifier. Block diagram ac milli voltmeter, specifications and their significance.
Unit II
  • Cathode Ray Oscilloscope: Block diagram of basic CRO. Construction of CRT, Electron gun, electrostatic focusing and acceleration (Explanation only no mathematical treatment), brief discussion on screen phosphor, visual persistence and chemical composition. Time base operation, synchronization. Front panel controls. Specifications of a CRO and their significance.
  • Applications of CRO: (1) Study of Wave Form, (2) Measurement of Voltage, Current, Frequency and Phase Difference.
  • Special features of dual trace, introduction to digital oscilloscope, probes. Digital storage Oscilloscope: Block diagram and principle of working.
Unit III

Signal Generators and Analysis Instruments: Block diagram, explanation and specifications of low frequency signal generators, pulse generator, and function generator, Brief idea for testing, specifications, Distortion factor meter, wave analysis.

Unit IV
  • Digital Instruments: Principle and working of digital meters, Comparison of analog and digital instruments, Characteristics of a digital meter, Working principles of digital voltmeter.
  • Digital Multimeter: Block diagram and working of a digital multimeter, Working principle of time interval, frequency and period measurement using universal counter/frequency counter, time-base stability, accuracy and resolution.

Questions

2025 | +3-VI-S-CBCS(MS)-Sc(H)-DSE-IV-Phy-R&B | FM

PART-I | Answer all Questions.| 1x8
  • A multimeter is also known as _____.
  • Which electronic device is used for measuring the voltage of both AC and DC?
  • ______generator produces saw tooth voltage waveform in a CRO.
  • The deflection sensitivity of a CRT is defined as the vertical deflection of the beam per unit ____ voltage.
  • Which generator produces both AC currents and voltages?
  • What should be the frequency range of pulse generator?
  • Which volmeter possess higher accuracy and resolution ?
  • Input Impedance of an digital multimeter is very ____ .
PART-II | 2. Answer any eight within two to three sentences | 1.5x8
  • State working principle of time interval of digital multimeter.
  • Write the working principle of digital voltmeter.
  • Give brief idea for testing of a generator.
  • Write the function of sweep generator in CRO.
  • What are the advantages of function generator ?
  • What is screen phosphor of CRT ?
  • What is difference between analog Oscilloscope (CRO) and digital Oscilloscope (DSO)?
  • What is time base operation of CRO?
  • Write different type of AC milli - voltmeter.
  • Write the specification of a Multimeter.
PART-III | 3 (in maximum 75 words.) | 2x8
  • Explain the sensitivity and resolution range of an instrument.
  • Explain the specification and significance of an electronic voltmeter.
  • Distinguish between an amplifier and a rectifier.
  • Explain the visual persistance of CRO.
  • Explain dual trace of a CRO.
  • Distinguish between signal generator and function generator.
  • Distinguish between analog and digital instruments.
  • What is distortion factor meter of a generator?
  • Explain the time base stability of digital Multimeter.
  • Write the function of low frequency signal generator.
PART-IV | Answer within 500 words each. | 6x4

4) With block diagram describe the principle, working and specification of an electronie voltmeter with their significance.
OR
With block diagram describe the principle, working, specification and significance of an AC milli voltmeter.

5) With neat diagram describe the principle of CRT and derive an expression for its electrostatic sensitivity.
OR
With neat diagram describe the principle, working, advantages and uses of digital storage ascilloscope.

6) With neat block diagram describe the principle, construction, working, merits and uses of signal generator.
OR
With neat block diagram describe the principle, construction, working, advantages and uses of function generator.

7) With neat block diagram describe the principle, construction, working and characteristics of digital voltmeter.
OR
With neat block diagram describe the principle, construction, working and characteristics of digital multimeter.

2024 | +3-VI-S-CBCS(MS)-Sc(H)-DSE-IV-Phy-R&B | Full Marks : 60

PART-I | Answer all Ouestions. | 1x8
  • A voltmeter should have _____ resistance.
  • The most accurate device for measuring voltage is _____.
  • The resistance of an ideal voltmeter is _____.
  • Various types of controls is made by _____ in electronic device.
  • The inner walls of CRr is coated with a conducting material known as ______.
  • The sensitivity of a multimeter is given in ______.
  • A signal generator creates ______ signal.
  • What are the types of pulse ?
PART-II | Answer any eight within two to three sentences | 1.5x8
  • Define precision.
  • What is loading effect in error measurements ?
  • Draw the Block diagram of an AC mili voltmeter.
  • What is the function of electron gun ?
  • What is Phosphor ?
  • What is dual trace ?
  • Draw the Block diagram of pulse generator.
  • Write principle of digital meters.
  • Draw the Block diagram of Digital Multimeter.
  • What is synchronization ?
PART-III | Answer any eight of the following (in maximum 75 words) | 2×8
  • Explain accuracy and resolution.
  • Write characteristics of digital meter.
  • Write working principle of digital voltmeter.
  • Explain testing of signal generator.
  • What is Distortion factor meter ?
  • Write some uses of CRO.
  • What is Time base operation in CRO ?
  • Write the specification and significance of AC mili- voltmeter.
  • Explain the input impedance of an electronic voltmeter.
  • Explain the accuracy and sensitivity of an instruments.
PART-IV | Answer within 500 words each. | 6×4
  1. With neat diagram describe the principle, construction and working of electronic voltmeter.

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