Measurement group API reference¶

The measurement group is a group element. It aggregates other elements like experimental channels (counter/timer, 0D, 1D and 2D or external attribute e.g. Tango) and trigger/gates. The measurement group role is to execute acquisitions using the aggregated elements.

A measurement group has a state attribute. The state indicates at any time if the measurement group is stopped, in alarm or moving. The state is composed from the states of all the elements involved in the measurement group. So, if one of the involved element (experimental channel or trigger/gate) is in moving or alarm state, the whole measurement group will be in that state.

The other measurement group’s attributes are:

timer

The name of the channel used as a timer.

integration time

Integration time to be used in the acquisition operation.

monitor count

Monitor count to be used in the acquisition operation.

acquisition mode

Acquisition mode to be used in the acquisition operation, either Timer or Monitor.

latency time

Latency time between two consecutive acquisitions in the same acquisition operation.

synchronization

Describes the acquisition operation synchronization. It is composed from the group(s) of equidistant acquisitions described by the following parameters:

initial point
initial delay
total interval
active interval
number of repetitions

These parameters can be expressed in different synchronization domains if necessary (time and/or position).

moveable

Name of the master moveable.

Note: This attribute has been included in Sardana on a provisional basis. Backwards incompatible changes (up to and including its removal) may occur if deemed necessary by the core developers.

The available operations are:

start acquisition()

Starts to acquire the measurement group.

start_acquisition()