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In a digital voltmeter, during start of conversion, zero indication is displayed and is called auto zeroing. This is achieved by
- a)Using a positive reference voltage
- b)Using a negative reference voltage
- c)Properly charging the differentiator circuit capacitance to ground
- d)Properly discharging the integrator circuit capacitance to ground
Correct answer is option 'D'. Can you explain this answer?
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In a digital voltmeter, during start of conversion, zero indication is...
In a digital voltmeter, during start of conversion, zero indication is displayed. This is known as auto zeroing.
The circuit is used for this purpose is shown below.
It consists of an integrator. To achieve auto zeroing, the switch S is connected from Vin to the ground potential and the capacitor C of the dual-slope integrator discharges to the ground.
The circuit is used for this purpose is shown below.
It consists of an integrator. To achieve auto zeroing, the switch S is connected from Vin to the ground potential and the capacitor C of the dual-slope integrator discharges to the ground.
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In a digital voltmeter, during start of conversion, zero indication is...
Auto Zeroing in a Digital Voltmeter
Auto zeroing is a technique used in digital voltmeters to compensate for offset errors and ensure accurate measurements. During the start of conversion, the zero indication is displayed, and this process is achieved by properly discharging the integrator circuit capacitance to ground.
Integrator and Differentiator Circuits
Before understanding the auto zeroing process, it is essential to know about the integrator and differentiator circuits in a digital voltmeter.
- Integrator Circuit: The integrator circuit in a digital voltmeter act as a low-pass filter and helps in converting the input voltage into a corresponding voltage ramp. This ramp voltage is then used for the conversion process.
- Differentiator Circuit: The differentiator circuit differentiates the ramp voltage generated by the integrator circuit, producing a pulse when the ramp voltage reaches zero. This pulse triggers the analog-to-digital converter to start the conversion process.
Auto Zeroing Process
During the auto zeroing process, the integrator circuit capacitance is properly discharged to ground. This discharge ensures that the integrator circuit starts from a known zero voltage level, compensating for any offset errors.
The auto zeroing process involves the following steps:
1. Conversion Start: When the digital voltmeter is switched on or started, the start of conversion signal is initiated.
2. Capacitor Discharge: The discharge switch in the integrator circuit is closed, allowing the stored charge on the integrator capacitor to flow to ground. This discharge process ensures that the integrator circuit starts from zero volts.
3. Integration and Conversion: After the auto zeroing process, the integrator circuit starts integrating the input voltage, generating a voltage ramp. This ramp voltage is then converted into a digital value using an analog-to-digital converter.
4. Display: The digital value obtained from the conversion process is displayed as the output on the digital voltmeter.
Advantages of Auto Zeroing
Auto zeroing offers several advantages in digital voltmeters:
1. Offset Compensation: Auto zeroing compensates for any offset errors present in the measurement system, ensuring accurate voltage measurements.
2. Improved Accuracy: By starting the integration process from a known zero voltage level, auto zeroing improves the overall accuracy of the digital voltmeter.
3. Stability: It helps in maintaining the stability of the measurement system by compensating for any changes in offset errors due to environmental factors or component aging.
In conclusion, auto zeroing in a digital voltmeter is achieved by properly discharging the integrator circuit capacitance to ground. This process compensates for offset errors and ensures accurate voltage measurements.
Auto zeroing is a technique used in digital voltmeters to compensate for offset errors and ensure accurate measurements. During the start of conversion, the zero indication is displayed, and this process is achieved by properly discharging the integrator circuit capacitance to ground.
Integrator and Differentiator Circuits
Before understanding the auto zeroing process, it is essential to know about the integrator and differentiator circuits in a digital voltmeter.
- Integrator Circuit: The integrator circuit in a digital voltmeter act as a low-pass filter and helps in converting the input voltage into a corresponding voltage ramp. This ramp voltage is then used for the conversion process.
- Differentiator Circuit: The differentiator circuit differentiates the ramp voltage generated by the integrator circuit, producing a pulse when the ramp voltage reaches zero. This pulse triggers the analog-to-digital converter to start the conversion process.
Auto Zeroing Process
During the auto zeroing process, the integrator circuit capacitance is properly discharged to ground. This discharge ensures that the integrator circuit starts from a known zero voltage level, compensating for any offset errors.
The auto zeroing process involves the following steps:
1. Conversion Start: When the digital voltmeter is switched on or started, the start of conversion signal is initiated.
2. Capacitor Discharge: The discharge switch in the integrator circuit is closed, allowing the stored charge on the integrator capacitor to flow to ground. This discharge process ensures that the integrator circuit starts from zero volts.
3. Integration and Conversion: After the auto zeroing process, the integrator circuit starts integrating the input voltage, generating a voltage ramp. This ramp voltage is then converted into a digital value using an analog-to-digital converter.
4. Display: The digital value obtained from the conversion process is displayed as the output on the digital voltmeter.
Advantages of Auto Zeroing
Auto zeroing offers several advantages in digital voltmeters:
1. Offset Compensation: Auto zeroing compensates for any offset errors present in the measurement system, ensuring accurate voltage measurements.
2. Improved Accuracy: By starting the integration process from a known zero voltage level, auto zeroing improves the overall accuracy of the digital voltmeter.
3. Stability: It helps in maintaining the stability of the measurement system by compensating for any changes in offset errors due to environmental factors or component aging.
In conclusion, auto zeroing in a digital voltmeter is achieved by properly discharging the integrator circuit capacitance to ground. This process compensates for offset errors and ensures accurate voltage measurements.
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In a digital voltmeter, during start of conversion, zero indication is displayed and is called auto zeroing. This is achieved bya)Using a positive reference voltageb)Using a negative reference voltagec)Properly charging the differentiator circuit capacitance to groundd)Properly discharging the integrator circuit capacitance to groundCorrect answer is option 'D'. Can you explain this answer?
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In a digital voltmeter, during start of conversion, zero indication is displayed and is called auto zeroing. This is achieved bya)Using a positive reference voltageb)Using a negative reference voltagec)Properly charging the differentiator circuit capacitance to groundd)Properly discharging the integrator circuit capacitance to groundCorrect answer is option 'D'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about In a digital voltmeter, during start of conversion, zero indication is displayed and is called auto zeroing. This is achieved bya)Using a positive reference voltageb)Using a negative reference voltagec)Properly charging the differentiator circuit capacitance to groundd)Properly discharging the integrator circuit capacitance to groundCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a digital voltmeter, during start of conversion, zero indication is displayed and is called auto zeroing. This is achieved bya)Using a positive reference voltageb)Using a negative reference voltagec)Properly charging the differentiator circuit capacitance to groundd)Properly discharging the integrator circuit capacitance to groundCorrect answer is option 'D'. Can you explain this answer?.
In a digital voltmeter, during start of conversion, zero indication is displayed and is called auto zeroing. This is achieved bya)Using a positive reference voltageb)Using a negative reference voltagec)Properly charging the differentiator circuit capacitance to groundd)Properly discharging the integrator circuit capacitance to groundCorrect answer is option 'D'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about In a digital voltmeter, during start of conversion, zero indication is displayed and is called auto zeroing. This is achieved bya)Using a positive reference voltageb)Using a negative reference voltagec)Properly charging the differentiator circuit capacitance to groundd)Properly discharging the integrator circuit capacitance to groundCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a digital voltmeter, during start of conversion, zero indication is displayed and is called auto zeroing. This is achieved bya)Using a positive reference voltageb)Using a negative reference voltagec)Properly charging the differentiator circuit capacitance to groundd)Properly discharging the integrator circuit capacitance to groundCorrect answer is option 'D'. Can you explain this answer?.
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