CYMT?
- returns frequency counter of specific source

PACU
- enables measurement for a specific source
- PACU AMPL,C1: enables amplitude measurement on C1

PAVA?
- queries for measurement on a channel
- C1:PAVA? AMPL: returns amplitude measurement on C1
- measurement does not need to be enabled (e.g. with PACU) for this to work

- can also request measurements enabled by PACU with special usage