What is video pattern generator? State its application.

What is video pattern generator? State its application.
by

1 Answer

Answer :

A pattern generator provides video signals directly, and with RF modulation, on standard TV channels for alignment ,testing and servicing of TV receivers. The output signal designed to produce simple geometric patterns like vertical and horizontal bars, checkerboard, cross –hatch, dots etc.

Applications :

1. Checking line and frame time bar linearity

2. Checking picture height and width

3. Video IF checking

4. Adjustments of sound IF stage and checking

5. AGC section checking

6. Trouble shooting video amplifier and using variable video output.


by

Related questions

Sketch block diagram of pattern generator and draw any four test patterns

Description : Sketch block diagram of pattern generator and draw any four test patterns

Last Answer :  Block Diagram of Pattern Generator: Test patterns of Pattern Generator:

Define signal generator and state its need.

Description : Define signal generator and state its need.

Last Answer : Signal Generator: A signal generator is an electronic device that generates repeating or Non-repeating electronic signals in either the analog or the digital domain. Need: The generation of ... of various electronic systems and for replacing missing signals in systems being analysed for repair. 

Explain measurement of phase and frequency using Lissajous pattern. Write the formula for each one.

Description : Explain measurement of phase and frequency using Lissajous pattern. Write the formula for each one.

Last Answer : Phase measurement of Lissajous pattern: The phase measurement can be done by using Lissajous figures. The CRO is set to operate in the X- Y mode, then the display obtained on the screen of a ... or sub- multiple of the unknown frequency.  The Lissajous pattern appears stationary.     

Define Lissajous pattern. Explain how Lissajous pattern is useful for frequency and phase measurement.

Description : Define Lissajous pattern. Explain how Lissajous pattern is useful for frequency and phase measurement.

Last Answer : Lissajous Pattern : The CRO is set to operate in the X- Y mode, when two sine waves of the same frequency are applied to the CRO (One vertical and one horizontal deflection plates) then the display obtained on ... 1. Lissajous pattern for ratio 3:1    2. Lissajous pattern for ratio 3:2  

Draw block diagram of RF signal generator and explain its operation.

Description : Draw block diagram of RF signal generator and explain its operation.

Last Answer : RF signal generator contains three other main sections: 1.OSCILLATOR CIRCUIT, 2. MODULATOR, 3. OUTPUT CONTROL CIRCUIT. The modulator modulates the RF signal of the ... . Metal shielding surrounds the unit to prevent signals from the oscillator from affecting the circuit under test

Draw block diagram of AF sine and square wave generator and explain its working

Description : Draw block diagram of AF sine and square wave generator and explain its working

Last Answer : The AF signal generator, which generates either sine wave or square wave in the range of audio frequencies based on the requirement is called AF Sine and Square wave generator. Its block diagram is shown ... can be used to produce either AF sine wave or AF square wave based on the requirement. 

Draw the block diagram of function generator and explain its working.

Description : Draw the block diagram of function generator and explain its working.

Last Answer : Principle of operation of function generator: Function generator operates to produce different waveforms such as sine, square, triangular of adjustable frequency which is used to test ... whose frequency is determined by the magnitude of current supplied by constant current sources.

Draw block diagram of function generator and list two specifications of it.

Description : Draw block diagram of function generator and list two specifications of it. 

Last Answer : Specifications: 1. Output- Square wave , sine wave, Triangular, TTL pulse 2. Frequency Ranges- 0.1 Hz to 11 MHz, up/down range switchable in eight decade steps 3. Dial Range-1 to 11 calibrated 0.1 to 1 uncalibrated 4. Pulse and Ramp Aspect Ratio-95:5

Describe working of pulse generator with proper block diagram

Description : Describe working of pulse generator with proper block diagram 

Last Answer : Explanation- Figure shows the block diagram of pulse generator. The circuit consists of two current sources, a ramp capacitor and schematic trigger circuit as well as current switching ... be synchronized to an external signal by triggering the circuit by an external synchronization pulse.

List four specifications of function generator.

Description : List four specifications of function generator. 

Last Answer : Specifications: 1. Output- Square wave , sine wave, Triangular, TTL pulse 2. Frequency Ranges- 0.1 Hz to 11 MHz, up/down range switchable in eight decade steps 3. Dial Range-1 to 11 calibrated 0.1 to 1 uncalibrated 4. Pulse and Ramp Aspect Ratio-95:5

Sketch the block diagram of function generator & describe the circuit of sine wave generation.

Description : Sketch the block diagram of function generator & describe the circuit of sine wave generation.

Last Answer : Block Diagram Explanation‐ For generation of sinewave , out of the three knobs‐ sine, square and triangular , the sine knob is pressed, output is adjusted for required frequency and amplitude using frequency and amplitude

Describe the block diagram of function generator.

Description : Describe the block diagram of function generator. 

Last Answer : Block diagram of function Generator Principle of operation of function generator: Function generator operates to produce different waveforms such as sine, square, triangular of adjustable ... whose frequency is determined by the magnitude of current supplied by constant current sources.

Explain the electro-magnetic flow meter with neat sketch and write it’s application.

Description : Explain the electro-magnetic flow meter with neat sketch and write it’s application. 

Last Answer : Electromagnetic flow meter: Principle of Operation: 1. The operation of an Electro-magnetic flow meter is based upon Faraday's Law, which states that the voltage induced across any conductor as it ... rates. It can be also used for measurement of flow rate of slurries, greasy materials.

Draw block diagram of DMM. State its advantages.

Description : Draw block diagram of DMM. State its advantages.

Last Answer : Advantages of DMM: 1. DMM provides numerical readouts that eliminate observational errors. Thus providing better readability. 2. DMM offers better accuracy and versatility as compared to ... memory devices for further computations. 5. The decreased size of DMM increases the portability

Define wave analyser and state its need, Draw the block diagram of it.

Description : Define wave analyser and state its need, Draw the block diagram of it. 

Last Answer : Wave analyzer:- Wave analyzer is an instrument which is used to measure the magnitude of the various harmonics of a complex waveform. It is an instrument that is designed to measure the relative amplitudes ... distortion and the system signal to noise ratio. Block Diagram of Wave analyser

Draw block diagram of successive approximation digital voltmeter. State its two advantages and two disadvantages

Description : Draw block diagram of successive approximation digital voltmeter. State its two advantages and two disadvantages

Last Answer : Block diagram Or Advantages: o It is economical method of analog to digital conversion. o The resolution is up to 5 important digits are obtained. Disadvantages: o ... depends on which type of switches are used. o The conversion time required for digital to analog converter.

Draw block diagram of frequency meter and state it’s principle of operation

Description : Draw block diagram of frequency meter and state it’s principle of operation

Last Answer : Block diagram Principle  The signal may be amplified before being applied to the Schmitt trigger. The Schmitt trigger converts the input signal into a square wave with fast rise and fall times, ... time interval between start and stop gate then, frequency of unknown signalis, f = N / t

Explain Piezo-electric transducer with diagram. State its applications, advantages and disadvantages.

Description : Explain Piezo-electric transducer with diagram. State its applications, advantages and disadvantages.

Last Answer : Explanation: Principle of operation: When a pressure or force or vibration applied to the crystalline material like quartz crystal or crystalline substances then an e.m.f. is generated across the ... destructive test (NDT) equipment's 4) Piezoelectric materials are use in ultrasonic transducers.

Draw block diagram of spectrum analyser, State applications of spectrum analyser.

Description : Draw block diagram of spectrum analyser, State applications of spectrum analyser.

Last Answer : Block Diagram: Applications: 1. Spectrum analyzer is a very important item of test equipment for someone designing or repairing electronic equipment that uses radio frequency signals. 2. Its ... of the dominant frequency within a signal 8. Used to measure the properties of RF devices

State and describe different triggering available in CRO

Description : State and describe different triggering available in CRO

Last Answer : A trigger is an external signal or input signal condition that initiates one or more instrument functions. Trigger settings include digital edges, software functions, and analog levels. This tutorial ... the external trigger input. The following figure shows an entering window trigger.  

Draw block diagram of DSO . State applications of DSO

Description : Draw block diagram of DSO . State applications of DSO

Last Answer : Applications of DSO : 1. It can be used to measure both AC and DC voltages and currents. It can also calculate RMS value, peak value, peak to peak value etc. 2. It ... . 5. It can be used to determine the modulation characteristics and detect the standing waves of transmission lines.

Draw and state how Aryton shunt type DC ammeter . State advantage of using Aryton shunt.

Description : Draw and state how Aryton shunt type DC ammeter . State advantage of using Aryton shunt.

Last Answer : OR The Aryton shunt eliminates the possibility of having the meter in the circuit without a shunt. This advantage is gained at the price of slightly higher overall Aryton shunt ammeter. In this ... between shunts. 3. Another advantage is that it may be used as a wide range ammeter. 

Define standards. State and explain classification of standards.

Description : Define standards. State and explain classification of standards.

Last Answer : Standards:-Standard is a physical representation of a unit of measurement. A known accurate measure of physical quantity is termed as standard. These standards are used to determine ... used to check components and calibrating laboratory instruments to achieve good accuracy and better performance.

State two uses of logic analyser.

Description : State two uses of logic analyser. 

Last Answer : 1. Real time application 2. Troubleshooting and analysis of digital systems 3. Compatible with printer using RS 232 and IEEE 488 interface 4. Testing the IC s to detect defect before constructed. ... Industries. 7. In various software industries. 8. To find fault in Bio- medical instruments. 

State the difference between CRO and DSO.

Description : State the difference between CRO and DSO.

Last Answer : CRO DSO Direcly reads analog voltage and displays it on screen. It reads the analog voltage and converts it into digital form before being displayed on the screen. ... DSP algorithms available and ported on microprocessor which can operate on stored samples of input voltage. 

State the advantages of Digital instrument.

Description : State the advantages of Digital instrument.

Last Answer : 1. They are having high input impedance, so there is no loading effect 2. They are having higher accuracy 3. An unambiguous reading is obtained 4. The output can be interfaced with external equipment 5. They are available in smaller size

State applications of digital frequency meter.

Description : State applications of digital frequency meter.

Last Answer : 1. For testing radio equipment 2. Measuring the temperature, pressure, and other physical values. 3. Measuring vibration, strain 4. Measuring transducers

State significance of ½ digit with an example

Description : State significance of ½ digit with an example

Last Answer : The number of digit position in a digital meter determine the resolution. ½ digit has a maximum value of 1 and has 2 possible conditions (0 or 1). Hence 3 digit display on a DVM for a 0 -1 ... above 999 up to 1999, to give overlap between ranges for convenience, a process called over ranging. 

Draw the diagram of PMMC instrument and state the deflection torque equation

Description : Draw the diagram of PMMC instrument and state the deflection torque equation

Last Answer : Equation Ʈ= B*A*I*N Where r= torque Newton. Meter B = flux density in the air gap. Wb/m2 A = effective coil area (m) N= number of turns of wire of the coil

Sketch block diagram of single trace CRO. State function of delay line.

Description : Sketch block diagram of single trace CRO. State function of delay line.

Last Answer : Function of Delay line: This block is used to delay the signal for a period of time in the vertical section of CRT. The input signal is not applied directly to the vertical plates because the part ... when the delay time is not used. Therefore, the input signal is delayed by a period of time.

State any four precautions to be taken while using an Ammeter and Voltmeter.

Description : State any four precautions to be taken while using an Ammeter and Voltmeter. 

Last Answer : Precautions to be taken while using Ammeters: Ammeters are to be connected in series of circuits. 1. While connecting ammeters across emf source always a series resistance should be used. This ... first &then range should be decreased. 4. Loading effect can be minimized by using high sensitivity

Define the term standards ,state the type of standard.

Description : Define the term standards ,state the type of standard. 

Last Answer : Standards:-Standard is a physical representation of a unit of measurement. A known accurate measure of physical quantity is termed as standard. These standards are used to determine the ... check components and calibrating laboratory instruments to achieve good accuracy and better performance.  

State any four applications of spectrum analyzer.

Description : State any four applications of spectrum analyzer.

Last Answer : Applications: 1. Spectrum analyzer is a very important item of test equipment for someone designing or repairing electronic equipment that uses radio frequency signals. 2. Its key factor is that it is ... of the dominant frequency within a signal 8. Used to measure the properties of RF devices

State any four specifications of digital voltmeter.

Description : State any four specifications of digital voltmeter. 

Last Answer : DC Voltage – 1 Five voltage ranges from ±200 to ±1000 2 Accuracy is about ±0.03% 3 Resolution is about 10µV AC Voltage1. Five voltage range available for 200mV to 750V 2. Accuracy is dependent on frequency. Best accuracy obtained is 0.5%

State need of delay line in CRO.

Description : State need of delay line in CRO. 

Last Answer : The delay line is used in CRO to delay the signal for some time in thevertical sections. As horizontal channel consists of trigger circuit andtime based generator. This causes more time to reach ... vertical plates. For synchronization of reachinginput signal at same time to both the plates in CRT. 

State different types of errors in Instruments.

Description : State different types of errors in Instruments.

Last Answer : There are three types of error 1) Gross Error: These errors are mainly human mistakes in reading instruments and recording and calculating measurement results. 2) Systematic Error : These types of ... operator 3) Random Error.:These errors are due to unknown causes which are not determinable.

State the meaning of PT-100.

Description : State the meaning of PT-100.

Last Answer : Pt-100:- A platinum resistance temperature detector (RTD) Pt100 is a device with a typical resistance of 100 Ω at 0°C (it is called Pt100). It changes resistance value as its temperature changes following a positive slope (resistance increases when temperature is increasing). 

Compare CRO and DSO. State the formula for phase measurement using CRO with necessary diagram.

Description : Compare CRO and DSO. State the formula for phase measurement using CRO with necessary diagram.

Last Answer : CRO DSO Directly reads analog voltage and displays it on screen. It reads the analog voltage and converts it into digital form before being displayed on the screen. ... algorithms available and ported on microprocessor which can operate on stored samples of input voltage.

State need of level measurement.

Description : State need of level measurement.

Last Answer : In almost all industries, vast quantities of liquid such as water solvents, chemicals etc. are used in number of processes. It is widely employed to monitor as well as measure ... and therefore its measurement becomes important in a variety of processes encountered in modern manufacturing plants.

Draw the sketch of electromagnetic flow meter and explain it. State advantages, disadvantages and applications of it.

Description : Draw the sketch of electromagnetic flow meter and explain it. State advantages, disadvantages and applications of it.

Last Answer : Diagram:  Explanation: Electromagnetic flow meters works based on Faraday's Law of Electromagnetic Induction. According to this principle, when a conductive medium passes through a magnetic ... water, chilled water. Used for flow measurement of Corrosive liquids, slurries and pastes.

State significance of Lissajous figure.

Description : State significance of Lissajous figure. 

Last Answer : Significance of Lissajous figure. The characteristics patterns that appear on the screen of a cathode ray tube, when sinusoidal voltages are simultaneously applied to horizontal and vertical plates .these ... is presented as a Lissajous figure. it is used for measurement of phase and frequency.

Draw block diagram of digital frequency meter in time mode and describe its operation.

Description : Draw block diagram of digital frequency meter in time mode and describe its operation.

Last Answer : OR Operation: The input signal is amplified and converted to a square wave by a Schmitt Trigger circuit. In this diagram the square wave is differentiated and clipped to ... thereby closing it. The decimal counter and display unit output correspond to the number of input pulses. 

Draw block diagram of distortion factor meter and explain its operation.

Description : Draw block diagram of distortion factor meter and explain its operation.

Last Answer : Block Diagram Operation This meter consist following four sections 1. Impedance converter along with input circuit 2. Rejection amplifier 3. Metering circuit 4. Power circuit 1. ... of the total input voltage. 4. The power supply unit provides the supply for proper operation 

Explain the concept of single beam dual trace CRO with its block diagram.

Description : Explain the concept of single beam dual trace CRO with its block diagram.

Last Answer : Diagram:   Explanation: The single beam dual trace CRO consists of one electron gun, an electronic switch which switches the two signals to a single vertical amplifier and a single pair of ... Amplifier are identical & have the same delay time, accurate X-Y measurements can be taken. 

Draw block diagram of digital LCR –Q meter and explain its working.

Description : Draw block diagram of digital LCR –Q meter and explain its working.

Last Answer : Block diagram Working The output of LCR-Q meter is given to current to voltage converter, AC amplifier or DC amplifer depending upon position of switch Current to voltage ... /D converter. A/D converter converts analog signal into digital output andfinaaly displayed on display.

Describe block diagram of spectrum analyzer and explain its working

Description : Describe block diagram of spectrum analyzer and explain its working

Last Answer : Fig: Block Diagram of Spectrum analyzer. 1. Spectrum analyzer consists of voltage tune oscillator, mixer, IF amplifier, detector, video amplifier, sweep generator and CRT. 2. The input ... on the screen. 8. In this type the signal are broken down into their individual frequency component.

Draw the circuit diagram of multi range AC voltmeter and describe its working

Description : Draw the circuit diagram of multi range AC voltmeter and describe its working

Last Answer : The above circuit looks like a multi range AC voltmeter. We know that, we will get AC voltmeter just by placing rectifier in series (cascade) with DC voltmeter. The above circuit was created ... any two points of an electric circuit, by connecting the switch, S to the desired voltage range.

What is LCR meter? Draw digital LCR –Q meter block diagram.

Description : What is LCR meter? Draw digital LCR –Q meter block diagram.

Last Answer : An LCR meter is a type of electronic test equipment used to measure the inductance (L), capacitance (C), and resistance (R) of an electronic component. Block diagram digital LCR –Q meter  

Draw Q meter circuit of series connection and explain it.

Description : Draw Q meter circuit of series connection and explain it.

Last Answer : Q meter circuit of series connection OR Explanation The Q meter works on series resonant. The resonance is the condition exists in the circuit when their inductance and capacitance reactance are ... . Hence E=Q Ec so ,the voltmeter is calibrated for finding the value of Q factor.  

Explain sensitivity and loading effect in voltmeter.

Description : Explain sensitivity and loading effect in voltmeter.

Last Answer : Sensitivity: The sensitivity of a voltmeter is just its capability to detect voltage, usually meaning smaller and smaller voltages. When selecting a meter for a certain voltage measurement, it is ... called loading effect of the voltmeters. It is mainly caused due to low sensitivity instruments.