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H-4
Measurement Queries
[:SENSe[1]]:DATA:FRESh?
What it does
This query is similar to the ":FETCh?" in that it returns the latest reading from the instrument,
but has the advantage of making sure that it does not return the same reading twice.
Limitations
Like the ":FETCh?" query, this command does not trigger a reading.
When appropriate
This is a much better choice than the ":FETCh?" query because it can't return the same
reading twice. This would be a good query to use when triggering by BUS or EXTERNAL,
because it will wait for a reading to complete if a reading is in progress.
The ":CALC:DATA:FRESh?" query is similar to the ":DATA:FRESh?" query, but applies to
readings which have math applied to them (e.g.:MX+B scaling).
[:SENSe[1]]:DATA[:LATest]?
What it does
This query will return the last reading the instrument had, regardless of what may have
invalidated that reading, such as changing ranges or functions.
Limitations
This query is fully capable of returning meaningless, old data.
When appropriate
If, for some reason, the user wanted the last completed reading, even after changing ranges
or other measurement settings, which would invalidate the old reading.
The ":CALC:DATA:LATest?" query is similar to the ":DATA:LAT?" query, but applies to
readings which have math applied to them (e.g.: MX+B scaling).
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