February 8, 2017. The National Institute of Standards and Technology (NIST) is a standards laboratory that is part of the U.S. Department of Commerce. The NIST traceable calibration refers to a program that certifies that the equipment used by labs or manufacturing facilities is properly calibrated according to the industry standards in place.
Quick Answer. VAC is an electrical voltage in an alternating current circuit. The power system supplying homes and businesses in the United States uses AC 120 V, while in Europe the system uses AC 240 V. Continue Reading.
Power Supply: The primary purpose of a power supply in a power amplifier is to take the 120 VAC power from the outlet and convert it to a DC voltage (VAC is an abbreviation for Volts Alternating Current, and DC is an abbreviation for Direct Current).