Operation of a 10-V programmable Josephson voltage standard system with a 10-K compact cryocooler

We have been operating a 10-V programmable Josephson voltage standard (PJVS) system that was developed based on a multi-chip technique. We compared the PJVS with an SIS-based conventional JVS indirectly using a zener diode. The results agreed within 10
^-8
level.