The voltage ripple noise (unit: rms) is as follows:
PWR401L: 5 mV
PWR401ML: 5 mV
PWR401MH: 20 mV
PWR401H: 50 mV
PWR801L: 5 mV
PWR801ML: 5 mV
PWR801MH: 20 mV
PWR801H: 50 mV
PWR1201L: 5 mV
PWR1201ML: 5 mV
PWR1201MH: 20 mV
PWR1201H: 50 mV
PWR2001L: 5 mV
PWR2001ML: 5 mV
PWR2001MH: 20 mV
PWR2001H: 50 mV
For the details, read the user’s manual – chapter of Specifications.