Digital Electronics - Digital Signal Processing - Discussion

The correct answer should be A - digital voltmeter. This application can allow long conversion time. Dual slope method gives good accuracy at low cost but long conversion time. Function generator and frequency counters do not need ADC

The analog to digital converters converts an analog signal into a digital value. In these converters resolution is the important. To get accurate digital value for respective analog signal resolution should be high, Dual slope ADC has high resolution because it's used in digital voltmeters, function generators, frequency counters and etc.