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instrument: add get_raw() API

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Derived metrics may be calculated form data in raw output that is not
present in the resulting MeasurementCSV. This adds a method to provide
uniform access to raw artifacts generated by an instrument.
This commit is contained in:
Sergei Trofimov
2017-08-30 14:55:42 +01:00
parent 2afa8f86a4
commit 823ce718bf
6 changed files with 36 additions and 8 deletions
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11
doc/instrumentation.rst
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@@ -65,8 +65,8 @@ Instrument
:INSTANTANEOUS: The instrument supports taking a single sample via
``take_measurement()``.
:CONTINUOUS: The instrument supports collecting measurements over a
period of time via ``start()``, ``stop()``, and
``get_data()`` methods.
period of time via ``start()``, ``stop()``, ``get_data()``,
and (optionally) ``get_raw`` methods.
.. note:: It's possible for one instrument to support more than a single
mode.
@@ -161,6 +161,13 @@ Instrument
.. note:: This method is only implemented by :class:`Instrument`\ s that
support ``CONTINUOUS`` measurement.
.. method:: Instrument.get_raw()
Returns a list of paths to files containing raw output from the underlying
source(s) that is used to produce the data CSV. If now raw output is
generated or saved, an empty list will be returned. The format of the
contents of the raw files is entirely source-dependent.
.. attribute:: Instrument.sample_rate_hz
Sample rate of the instrument in Hz. Assumed to be the same for all channels.