Clears the present valid measurement data and starts a new measurement.

If the trigger source parameter of the sequence 3 group is IMM, the measurement starts immediately. If set to BUS, the measurement starts after waiting for a software trigger.

New measurement data will be established after 4 ms from the measurement begins. The measured data is stored in the measurement data cache, and it can be queried by "FETC:xxx?"command. The measurement data returns the mean value data (the moving average deviations of 64 times measured in every 4 ms).