VTU Notes | 18EC36 | POWER ELECTRONICS & INSTRUMENTATION

VTU Module - 4 | Digital Voltmeter

Module-4

4.9
2018 Scheme | ECE Department

Created by VtuNotes.in
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5 Modules

18EC36 | POWER ELECTRONICS & INSTRUMENTATION | Module-4 VTU Notes

Summary:

Digital Voltmeters (DVMs) are essential electronic instruments used to measure voltage levels accurately and efficiently. Several techniques are employed in DVMs to achieve this. Here, we will briefly discuss four prominent DVM concepts: Ramp Technique DVM, Dual Slope Integrating Type DVM, Direct Compensation Type DVM, and Successive Approximations Type DVM.

1. Ramp Technique DVM:

In this technique, a linear ramp signal is generated, which is allowed to ramp up or down based on the input voltage.
The time taken for the ramp signal to cross a predetermined threshold is directly proportional to the input voltage.
It offers good accuracy and resolution and is commonly used in low-cost DVMs.

2. Dual Slope Integrating Type DVM:

This method integrates the input voltage over two different time intervals.
First, a known reference voltage is applied, and the integrator's output voltage ramps up.
Then, the input voltage is applied, and the integrator's output ramps down.
The time taken for the second ramp to return to zero is proportional to the input voltage, ensuring high accuracy.

3. Direct Compensation Type DVM:

Direct compensation DVMs employ an internal reference voltage source that is digitally adjusted to match the input voltage.
This technique ensures accuracy by comparing the input voltage to the reference and continuously updating the reference voltage.

4. Successive Approximations Type DVM:

This type of DVM uses a binary search method to determine the input voltage.
It starts with the most significant bit (MSB) of the digital code and iteratively narrows down the possible voltage range until the most accurate result is obtained.
Successive approximations DVMs offer high-speed operation and excellent accuracy.

Each of these DVM techniques has its advantages and limitations, making them suitable for different applications based on factors like cost, accuracy, and speed. Understanding these concepts is crucial for electronics engineers and technicians working with voltage measurement equipment.

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