Brief Overview on the A1 The NEUTRIK A1 is a flexible, powerful, accurate and easy-to-use audio measurement system. It measures • Level (absolute) in μV, mV, V, dBV and dBu or dBm • Level relative in *1, % and dBr • Total harmonic distortion & noise (THD+N) in % and dB • Wow and Flutter in % • Noise (absolute) in μVq, mVq, Vq and dBq • Noise relative in *1, % and dBr • Crosstalk (absolute) in μV, mV, V, dBV and dBu or dBm • Crosstalk (relative) in *1, % and dBr • Frequency in Hz • Phase in the range of ±180° degree (available with installed AO2 option only) Results are shown on a large, backlit graphics LC-display. Individual measurement results are displayed in digits, while sweeps are shown graphically. Another, very powerful diagnostic aid of the A1 is the SCOPE mode, that displays the waveform of the input signal on the LCD just like on a conventional oscilloscope. In the THD+N function, the original input signal and the distortion residual are shown as two traces. In other functions, the measured signal is shown as a single trace. The contents of the display can be printed out at any time to an ordinary dot-matrix printer to provide hardcopies e.g. of frequency responses or signal waveforms. All measurements - except noise - are made after true RMS conversion of the input signal. Noise is quasi-peak measured according to CCIR 468-3. Both a 400 Hz high- pass and a 22Hz-22kHz band-pass filter are available as a standard. The two inputs of the A1 are DC-isolated to ±100V, and equipped with bothstandard input impedances of 100kΩ and a Phantom power supply. A small, built-in loudspeaker allows acoustical monitoring of the input signal. The internal oscillator may generate sine or square signals from 20Hz to 40kHz, and is able to sweep in coarse or fine steps. Its 0Ω output impedance makes it suitable for feeding even loudspeakers directly. Sweep ability is available for Level, THD+N, Noise, Crosstalk, Phase and Relative Level functions. Sweeps can be controlled from the built-in generator or from external sources (e.g. test tapes, test CDs, or remote A1s at other locations).