railway RRB JE (CBT I + CBT II) Mock Test 2024 Electrical and Electronics Measurements Digital Voltmeters
Consider the following types of digital voltmeters:
1. Ramp type
2. Dual slope integrating type
3. Integrating type using voltage to frequency conversion
4. Successive approximation type
5. Servo balanced potentiometer type
Which of these require a fixed reference voltage at the comparator stage?1
1 and 2 only
2
3, 4 and 5 only
3
2 and 3 only
4
1, 4 and 5 only