DIGITAL VOLTMETERS

Microprocessor Based Ramp Type DVM

Microprocessor Based Ramp Type DVM: A basic block diagram of a Microprocessor Based Ramp Type DVM and its operating waveform is shown in Fig. 5.17 (a) and (b) respectively. Depending on the command fed to the control input of the multiplexer by the microprocessor, input 1 of the comparator can be consecutively connected to the […]

Continuous Balance DVM

Continuous Balance DVM: Continuous Balance DVM – The basic block diagram of a servo balancing potentiometer type DVM is shown in Fig. 5.15. The input voltage is applied to one side of a mechanical chopper comparator, the other side being connected to the variable arm of a precision potentiometer. The output of the chopper comparator, […]

Successive Approximations

Successive Approximations: The successive approximations principle can be easily understood using a simple example; the determination of the weight of an object. By using a balance and placing the object on one side and an approximate weight on the other side, the weight of the object is determined. If the weight placed is more than […]

Principles of ADC

Principles of ADC (Analog to Digital Conversion): Principles of ADC – The input signal is compared with an internally generated voltage which is increased in steps starting from zero. The number of steps needed to reach the full compensation is counted. A simple compensation type is the staircase ramp. The Staircase Ramp The basic principle […]

Integrating Type DVM

Integrating Type DVM (Voltage to Frequency Conversion): The principle of operation of an Integrating Type DVM is illustrated in Fig. 5.5. A constant input voltage is integrated and the slope of the output ramp is proportional to the input voltage. When the output reaches a  certain value, it is discharged to 0 and another cycle begins. The […]

Dual Slope Integrating Type DVM

Dual Slope Integrating Type DVM(Voltage to Time Conversion): Dual Slope Integrating Type DVM – In ramp techniques, superimposed noise can cause large errors. In the dual ramp technique, noise is averaged out by the positive and negative ramps using the process of integration. Principle of Dual Slope Type DVM As illustrated in Fig. 5.3, the […]

Introduction to Digital Voltmeters

Introduction to Digital Voltmeters: Introduction to Digital Voltmeters (DVMs) are measuring instruments that convert analog voltage signals into a digital or numeric readout. This digital readout can be displayed on the front panel and also used as an electrical digital output signal. Any DVM is capable of measuring analog dc voltages. However, with appropriate signal […]

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