Chapter | twelve
The Standard Volume Indicator (VU Meter)
CHAPTER OUTLINE
Calibration Using the VU Meter
The Standard Volume Indicator (SVI) (also commonly known as a VU meter) was originally developed by the Bell System around 1940. It was standardized in 1942 (American Standards Association (ASA), C16.5-1942: American Recommended Practice for Volume Measurements of Electrical Speech and Program Waves), and has ever since been the most used – and perhaps most misused and misunderstood – analog level meter in audio. The latest reaffirmation of the standard was issued by the IEC in 1990. The ANSI standard was withdrawn in 1999.
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