# What is the use of sample and hold circuit?

169 views

Sample and hold circuit is use for sampling of analogue signals and holding its value for some time.

Sample-and-hold circuit is a device with a mode control switch that causes reading the input at the instance of the trigger and maintaining that value until the next trigger pulse.

## Related questions

78 views

Description : In a sample-and-hold circuit, the aperture time is (A) time required following a sample (B) time required for the switch to open (C) transition time interval between sample and hold (D) time from the hold command to the opening of the switch

124 views

Last Answer : Sample and hold circuit is the important part of data converters (ADC and DAC). Sample and hold circuit is also called as track-and-hold circuit. Sample and hold circuit is use for sampling ... some time. Sample and hold circuit basically uses an analogue switch (like JFET) and capacitor.

10 views

Description : What is a sample and hold circuit? Where it is used?

Last Answer : A sample and hold circuit is one which samples an input signal and holds on to its last sampled value until the input is sampled again. This circuit is mainly used in digital interfacing, analog to digital systems, and pulse code modulation systems.

272 views

Description : Explain the function of sample and hold circuit by using op-amp.

Last Answer : sample and hold circuit by using op-amp The n-channel MOSFET is driven by a control voltage VC acts as a switch. The control voltage VC is applied to the gate of the MOSFET ... called sample period. The time period during which the voltage across capacitor is constant is called Hold period.

140 views

Description : Define Sample and hold period with reference to S/H circuit.

Last Answer : Sample Period:- The time period during which the voltage across the capacitor is equal to the input voltage is called sample period. Hold Period:- The time period during which the voltage across the capacitor is constant is called hold period.

80 views

Description : In a particular circuit connection, AWG 18 wire is selected over AWG 22. The reason is that it is having

Last Answer : In a particular circuit connection, AWG 18 wire is selected over AWG 22. The reason is that it is having Higher current carrying capacity

3 views

Description : Define sample period and hold period.

Last Answer : The time during which the voltage across the capacitor in sample and hold circuit is equal to the input voltage is called sample period.The time period during which the voltage across the capacitor is held constant is called hold period.

297 views

Description : Sample -and -hold circuits in ADCs are designed to : - a) sample and hold the output of the binary counter during the conversion process b) stabilize theAD Cs threshold c) voltage ... d) signal during the conversion process sample and hold the ADC staircase waveform during the conversion process

Last Answer : Sample -and -hold circuits in ADCs are designed to : - voltage during the conversion process stabilize the input analog

2.4k views

Description : need of calibration and explain the procedure to calibrate the instrument.

Last Answer : Need of calibration: Every measuring device degrades over time due to normal wear and tear. These changes can be caused by various reasons such as electric or mechanical shock or a hazardous manufacturing ... different magnitude are used to calculate the resistance based on ohm's law.

2.3k views

Description : Compare Dual slope DVM and SAR type DVM.

Last Answer : Sr no Dual slope DVM SAR type DVM 1 It is highly accurate It is moderately accurate 2 Cost is high It is inexpensive 3 Two comparator is used One comparator is used ... resolution Good resolution 5 Slow speed High speed 6 Less Error More error

2.9k views

Description : block diagram of logic analyzer.

Last Answer : A logic analyzer can be triggered on a complicated sequence of digital events, then capture a large amount of digital data from the system under test (SUT).When logic analysers first came ... Once the data are captured, they can be displayed several ways, from the simple) to the complex

239 views

Description : operation of DSO with block diagram.

Last Answer : The input is amplified and attenuated with input amplifiers. The output of the input signal amplifiers feeds an analog to digital converter (ADC). There are numbers of ADC available. But the selection of ADC ... view the display on the CRT, the data from memory is reconstructed in analog form.

2.3k views

Description : sketch time period measurement by CRO.

Last Answer : Horizontal sweep is turned ON and the display appealing on the screen is adjusted by varying different control knobs provided on the front panel of CRO, till the signal is suitably displayed ... Where m=Number of division in one complete cycle n=Setting of time base =Time/Division

203 views

Description : operation of ramp type DVM.

Last Answer : This is given to an input comparator which will compare two signals and generates the output. One input to the input comparator is from the input and another input is from the ramp. This input voltage and ... ground and output is given. This output will stop the flow of purchase from clock

273 views

Description : operation of half wave rectifier type AC Voltmeter.

Last Answer :  Half-wave Rectifier Voltmeter The d'Arsonval meter movement only responds to the average or dc value of the current through the moving coil. In order to measure alternating ... ) input voltage signal alternating signal needs to be rectified first by using diode rectifier to produce

101 views

Description :  operation of whetstone bridge.

Last Answer : A Wheatstone bridge is widely used to measure the electrical resistance. This circuit is built with two known resistors, one unknown resistor and one variable resistor connected in the form of bridge. ... using a Wheatstone Bridge the unknown electrical resistance value can easily measure.

165 views

Description : role of the series resistance connected in PMMC movement.

Last Answer : A PMMC Instrument can be used as voltmeter by just connecting a series resistance with the moving coil. This series resistance is called Voltmeter Multiplier. This combination of moving coil and ... current whose voltage is to be measured. Ideally the resistance of voltmeter should be infinite

204 views

Description : different types of errors occurs in measurement.

Last Answer : Generally errors are classified into three types: systematic errors, random errors and blunders. 1) Gross Errors 2) Random Errors 3) Systematic Errors Instrumental Errors Environmental ... to wrong observations or reading in the instruments particularly in case of energy meter reading.

93 views

Description : tern null as it applies to bridge measurement.

Last Answer : Null measurements balance voltages so that there is no current flowing through the measuring device and, therefore, no alteration of the circuit being measured. Null measurements are generally more ... the use of standard voltmeters and ammeters, and they still have limits to their precision.

273 views

Description : application of CRO.

Last Answer : Applications of CRO: 1) Voltage measurement. 2) Current measurement. 3) Measurement of phase difference. 4) Measurement of phase. 5) Measurement of frequency. 6) Measurement of inductance. ... in various circuits. 17) For checking transistor. 18) It can measure short time interval.

69 views

Description : How many non-overlapping channels are available in IEEE 802.11b

Last Answer : 3 non-overlapping channels are available in IEEE 802.11b

481 views

Description : Number of comparators required for an 8 bit flash ADC is: (1) 8 (2) 16 (3) 255 (4) 256

Last Answer : Number of comparators required for an 8 bit flash ADC is: 255

257 views

Description : In D/A converter, the resolution required is 50mv and the total maximum input is 10v. The number of bits required is   (A) 7 (B) 8 (C) 9 (D) 200

Last Answer : In D/A converter, the resolution required is 50mv and the total maximum input is 10v. The number of  bits required is 8

189 views

Description : Choose the correct statement  (a) Digital multimeters are built using current measuring elements, while analog multimeters are built using voltage measuring units (b) Digital multimeters are built ... measuring units (d) Both digital and analog multimeters are built using current measuring units

Last Answer : Choose the correct statement  (a) Digital multimeters are built using current measuring elements, while analog multimeters are built using voltage measuring units (b) Digital multimeters are built ... measuring units (d) Both digital and analog multimeters are built using current measuring units

187 views

Description : An analog voltmeter has a sensitivity of 10kΩ/volt. The galvanometer used in constructing the instrument will produce a full scale deflection when the current passed through it is  (a) 10 mA (b) 20 mA (c) 50 mA (d) 100 μA

Last Answer : An analog voltmeter has a sensitivity of 10kΩ/volt. The galvanometer used in constructing the instrument will produce a full scale deflection when the current passed through it is 100 μA

108 views

Description : An optical fiber cable laid underground has developed a discontinuity at a distance d from the source end. The fault can be located using the instrument  (a) Optical spectrum Analyzer (OSA) (b) Optical Time Domain Reflectometer (OTDR) (c) Optical Power Meter (OPM) (d) Laser Diffractometer (LD)

Last Answer : An optical fiber cable laid underground has developed a discontinuity at a distance d from the source end. The fault can be located using the instrument Optical Time Domain Reflectometer (OTDR)

177 views

Description : Two sinusoidal signals of the same frequency are displayed on a dual-trace oscilloscope. One complete cycle of each signal covers 6 cm of the horizontal scale and the starting point of the horizontal scale and the starting ... between the two signals in degrees is  (a) 30 (b) 45 (c) 60 (d) 90

Last Answer : Two sinusoidal signals of the same frequency are displayed on a dual-trace oscilloscope. One complete cycle of each signal covers 6 cm of the horizontal scale and the starting point of the horizontal ... signals are separated by 0.5 cm. The phase difference between the two signals in degrees is 30

150 views

Description : Transient signals can be observed using  (a) storage oscilloscope (b) sampling oscilloscope (c) wave analyzer (d) spectrum analyzer

Last Answer : Transient signals can be observed using storage oscilloscope

277 views

Description : The trace on an oscilloscope continually moves to the right of the screen when  (a) the sweep is triggered. (b) the sweep period is larger than the signal period. (c) the sweep period is smaller than the signal period. (d) there is no weep.

Last Answer : The trace on an oscilloscope continually moves to the right of the screen when the sweep period is smaller than the signal period.

359 views

Description : In a dual trace oscilloscope, the display appears segmented when  (a) low frequency signals are observed in Alternate mode (b) low frequency signals are observed in Chop mode (c) high frequency signals are observed in Alternate mode (d) high frequency signals are observed in Chop mode

Last Answer : In a dual trace oscilloscope, the display appears segmented when high frequency signals are observed in Chop mode

95 views

Description : To distinguish between signals having very close values, we need an instrument with  (a) high accuracy (b) high resolution (c) high sensitivity (d) high linearity

Last Answer : To distinguish between signals having very close values, we need an instrument with high resolution

167 views

Description : In a weighted-resistor digital-to-analog converter with 8-bit input, if the resistance corresponding to the MSB is 2K, what will be the resistance corresponding to the LSB?  (a) 250 Ω (d) 512 KΩ (c) 256 KΩ (d) 25.5 Ω

Last Answer : In a weighted-resistor digital-to-analog converter with 8-bit input, if the resistance corresponding to the MSB is 2K, what will be the resistance corresponding to the LSB?  (a) 250 Ω (d) 512 KΩ (c) 256 KΩ (d) 25.5 Ω

76 views

Description : ESD stands for

Last Answer : ESD stands for Electro static Discharge

528 views

Description : Very small displacements are effectively measured using

Last Answer : Very small displacements are effectively measured using LVDT

342 views

Description : Y –axis in a CRO normally represents

75 views

Description : What are the types of error?

Last Answer : Human error or gross error, systematic error, applicational error and random error are the types of error.

139 views

Description : What are the factors influencing measurement errors?

Last Answer : The factor influencing measurement errors are accuracy, precision, range and bandwidth, sensitivity, resolution and uncertainty.

82 views

Description : What are the SI derived units?

Last Answer : Electrical capacitance, electrical resistance, electrical inductance, force, energy, power, magnetic flux, electric charge, and electric potential difference and EMF. These are the nine SI derived units.

102 views

Description : What are the seven base units?

Last Answer : Length, mass, time, electric current, temperature, luminous intensity and amount of substance are the seven base units.

101 views

Description : What is logic analyser?

Last Answer : Logic analyser is the extension of Oscilloscope. Logic analyser is used for troubleshooting digital circuits. Logic analyser can store digital data and it have 8 to 64 channels. Logic analyser are used for Hardware verification, fault analysis and automated testing.

125 views

Description : What is digital storage oscilloscope (DSO)?

Last Answer : Digital storage oscilloscope have many advantages as compared to analogue oscilloscope. Digital storage oscilloscope uses analogue to digital converter and digital to analogue converter and also it ... oscilloscope is used for comparing waveforms and recording and it have many different uses.

83 views

Description : What is phosphorescence and fluorescence?

Last Answer : Fluorescence is the light produced when the source of energy is applied. The light produced after the removal of source of energy is known as phosphorescence.

112 views

Description : Which type of ADC gives high resolution?

Last Answer : Sigma Delta, successive approximation and integrating type analogue to digital converter gives very high resolution but they have slower speed.

89 views

Description : Which is the fastest type of analogue to digital converter?

Last Answer : Flash converter is the fastest type of analogue to digital converter (ADC).

114 views

Description : Gross errors occur in measurements because of (A) disturbances about which we are unaware. (B) human mistakes. (C) inherent shortcomings in the instrument. (D) loading effects on the meters.

Last Answer : Gross errors occur in measurements because of human mistakes.

130 views

Description : The vertical deflection of an electron beam on the screen of a CRO is measured to be 8 mm. Now, the potential difference between the Y-plates is doubled, and simultaneously the pre-accelerating anode voltage is reduced to half of ... on the screen would become (A) 64 mm (B) 32 mm (C) 8 mm (D) 1 mm

Last Answer : The vertical deflection of an electron beam on the screen of a CRO is measured to be 8 mm. Now, the potential difference between the Y-plates is doubled, and simultaneously the pre-accelerating ... of its previous value. Then, the vertical deflection of the beam on the screen would become 32 mm

144 views

Description : The operation of a ramp type Digital Voltmeter is based on the principle of (A) Voltage-to-current conversion. (B) Voltage-to-time conversion. (C) Current-to-time conversion. (D) Current-to-frequency conversion.

Last Answer : The operation of a ramp type Digital Voltmeter is based on the principle of Voltage-to-time conversion.

133 views