The AC Quantum Voltmeter is a programmable Josephson voltage standard system applicable for the highest level of precision voltage measurements from DC up to kHz frequencies.
It was developed by the Physikalisch-Technische Bundesanstalt Braunschweig (PTB) in cooperation with the companies esz AG and Supracon AG.

It facilitates a variety of voltage calibrations and measuring functions:

• Primary DC & AC Josephson voltage standard up to kHz frequencies
• Calibration of calibrators
• Calibration of secondary voltage standards
• Calibration of voltmeter linearity
• Calibration of thermal converters (optional)
• Voltage source with ultimate precision and lowest noise level