ML248xA / ML249xA Common Procedures
5-28 13000-00162
September 2005
Random Repetitive Sampling (RRS) (ML249xA only)
As shown in the table on the previous page, if the capture time is set to a value less than
3.2 µs, a random repetitive sampling (RRS) method is used to acquire the data. RRS is
selected automatically as necessary by the power meter and no user setting is required.
When active, an RRS flag displays in the top right corner of the channel display area.
When RRS is active, an effective sampling rate of 1 Gsample
per second is achieved by progressively filling up data slots
until the entire trace has been acquired. The particular slot to
which the data for any of the sweeps is written is determined
by the time between the trigger and the first measurement
point, and then the time from this point to the current
measurement point. When an RRS measurement is being
made but is not yet complete, the measurement and marker
values display as a series of dashed lines. When all of the 16
data slots have been filled and the trace is complete, the
readout values are then displayed, and the RRS indicator in
the channel area of the screen changes from red to green.
It should be noted that as RRS relies upon multiple successive
measurements of a repetitive signal, it is not available for
continuously triggered measurements.
The message, “Out of range for continuous trigger” displays if an attempt is made to set
the trigger capture time to less than 3.2 µs when the trigger source is set to continuous.
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