Consider the following types of digital voltmeters:1. Ramp type2. Dual slope integrating type3. Integrating type using voltage to frequency conversion4. Successive approximation type5. Servo balanced potentiometer typeWhich of these require a fixed reference voltage at the comparator stage?

Consider the following types of digital voltmeters:1. Ramp type2. Dual

1.	Consider the following types of digital voltmeters:1. Ramp type2. Dual slope integrating type3. Integrating type using voltage to frequency conversion4. Successive approximation type5. Servo balanced potentiometer typeWhich of these require a fixed reference voltage at the comparator stage?
A.	1 and 2 only
B.	3, 4 and 5 only
C.	2 and 3 only
D.	1, 4 and 5 only
Answer» D. 1, 4 and 5 only

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Consider the following types of digital voltmeters:1. Ramp type2. Dual slope integrating type3. Integrating type using voltage to frequency conversion4. Successive approximation type5. Servo balanced potentiometer typeWhich of these require a fixed reference voltage at the comparator stage?

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