Sequoia Series 169
6.6 Acquiring Measurement Data
The source has the capability to return a number of current, voltage, and power measurements. When
the power source is turned on, it is continuously sampling the instantaneous output voltage and current
for several output cycles and writing the results into a buffer. The buffer holds 4096 voltage and current
data points.
The power source uses the data from the voltage and current buffer to calculate the requested
measurement information. Data in the voltage and current buffers is always re-acquired for subsequent
measurement requests. There are two ways to make measurements:
• Use the MEASure commands to immediately start acquiring new voltage and current data,
and return measurement calculations from this data as soon as the buffer is full. This is
the easiest way to make measurements, since it requires no explicit trigger programming.
• Use an acquisition trigger to acquire the voltage and current data from the buffer. Then
use the FETCh commands to return calculations from the data that was retrieved by the
acquisition trigger. This method gives you the flexibility to synchronize the data acquisition
with an external signal. FETCh commands do not trigger the acquisition of new
measurement data, but they can be used to return many different calculations from the
same set of data that was captured as a result of same acquisition trigger.
The query response for measurements is not immediate. The source will accept commands from the
interface while the measurement in progress. To prevent the source from accepting additional
commands during measurement the *WAI must be used with the measurement query command.
MEAS:FREQ?;*WAI
Making triggered measurements with the acquisition trigger system is discussed under "Triggering
Measurements".
Note For each MEASure form of the query, there is a corresponding query that begins
with the header FETCh. FETCh queries perform the same calculation as their
MEASure counterparts, but do not cause new data to be acquired. Data acquired
by an explicit trigger or a previously programmed MEASure command are used.
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