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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?
Most Upvoted Answer
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.
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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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