The centrepiece of the AC Quantum Voltmeter is a 10 Volt programmable Josephson voltage standard circuit

• Number of Josephson junctions: 69632
• Maximum output voltage: ±10.08 V
• Operating frequency: 70 GHz
• Zero & first order Shapiro step: 1 mA
• Bias current: ±6 mA
• Voltage increment: 145 µV  
  

V = n × f / KJ90
V	Josephson voltage	KJ90	Josephson constant
n	programmable integer	f	microwave frequency