Which device contains a multirange AF voltmeter calibrated in dB and a 1000 Hz bandstop filter?

The SINAD meter is designed to measure Signal-to-Noise and Distortion (SINAD), which is particularly valuable in evaluating the quality of audio signals in communication systems. A key feature of the SINAD meter is its incorporation of a multirange audio frequency (AF) voltmeter that is calibrated in decibels (dB). This allows users to easily assess the signal levels in a logarithmic scale, which is convenient for analyzing audio signals commonly encountered in communications.

Additionally, the SINAD meter typically includes a 1000 Hz bandstop filter, or notch filter, which effectively eliminates a specific frequency, allowing for clearer measurement of the signal-to-noise ratio by focusing on the relevant audio frequencies and filtering out unwanted tones. This capability is crucial in situations where the signal quality must be assessed without interference from particular frequencies.

In contrast, devices such as wattmeters, signal generators, and frequency analyzers serve different functions. Wattmeters measure power, signal generators provide signals for testing, and frequency analyzers examine the frequency components of signals. None of these devices focus specifically on the combination of features found in a SINAD meter, such as monitoring audio signal quality with a response calibrated in dB while utilizing a bandstop filter.