Instrument driver package for precision optical chopper SR542 from Stanford Research Systems
Project description
srsinst.sr542
srsinst.sr542
is a Python package to control the
SR542 Precision Optical Chopper
from Stanford Research Systems (SRS).
srsinst.sr542
is based on srsgui,
which you do not need to install separately,
but is included with this install.
Installation
You need a working Python 3.7 or later with pip
(Python package installer) installed.
If you don't, install Python to your system.
To install srsinst.sr542
as an instrument driver , use Python package installer pip
from the command line.
python -m pip install srsinst.sr542
To use it as a GUI application, create a virtual environment, if necessary, and install:
python -m pip install srsinst.sr542[full]
Run srsinst.sr542
as GUI application
If the Python Scripts directory is in your PATH environment variable, start the application by typing from the command line:
sr542
If not,
python -m srsinst.sr542
will start the GUI application.
Once running the GUI, you can:
- Connect to an SR542 from the Instruments menu.
- Select a task from the Task menu.
- Press the green arrow to run the selected task.
You can write your own task(s) or modify an existing one and run it from the GUI application, too.
Use srsinst.sr542
as instrument driver
- Start a Python interpreter, a Jupyter notebook, or an editor of your choice to write a Python script.
- Import the SR542 class from
srsinst.sr542
package. - Create an instance of the SR542 and establish a remote connection.
|
C:\>python
Python 3.11.0 (main, Oct 24 2022, 18:26:48) [MSC v.1933 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>>
>>> from srsinst.sr542 import SR542
>>> chopper = SR542('serial', 'COM4', '115200')
>>> chopper.check_id()
('SR542', 's/n00001005', 'v1.0.5')
SR542 is comprised of multiple Components,
which provides groupings of related commands and class methods.
The Component class has a convenience attribute dir
to show available attributes and methods in the Python dictionary format.
>>> chopper.dir.keys()
dict_keys(['components', 'commands', 'methods'])
SR542 has 5 components that contain remote commands and methods as organized in the Remote Operation chapter of the SR542 Operating Manual and Programming Reference.
>>> chopper.dir['components'].keys()
dict_keys(['config', 'operate', 'setup', 'interface', 'status'])
Configure SR542 components
Let's set the chopper Configuration.
>>> chopper.config.dir
{'components': {},
'commands': {'source': ('DictCommand', 'SRCE'),
'sync_edge': ('DictCommand', 'EDGE'),
'control_target': ('DictCommand', 'CTRL'),
'internal_freq': ('FloatCommand', 'IFRQ'),
'phase': ('FloatCommand', 'PHAS'),
'relative_phase': ('BoolCommand', 'RELP'),
'multiplier': ('IntCommand', 'MULT'),
'divisor': ('IntCommand', 'DIVR'),
'vco_frequency': ('FloatCommand', 'VCOS')},
'methods': ['jump_to_internal_frequency']
}
If a command is a DictCommand
instance, it uses mapped keys and values.
Use get_command_info()
to find out the mapping dictionary information.
>>> chopper.config.get_command_info('source')
{'command class': 'DictCommand',
'raw remote command': 'SRCE',
'set_dict': {'internal': 0, 'vco': 1, 'line': 2, 'external': 3},
'get_dict': {'internal': 0, 'vco': 1, 'line': 2, 'external': 3},
'index_dict': None
}
The command chopper.config.source
encapsulates the raw command 'SRCE'
explained in the Setion 3.4.4 of the manual.
The token integers (0, 1, 2, and 3) are mapped to the strings ('internal'
, 'vco'
, 'line'
, and 'external'
)
>>> chopper.config.source
'internal'
>>> chopper.config.source = 'external'
>>> print(chopper.config.source)
external
You can configure other parameters in the similar way.
>>> chopper.config.internal_freq
100.0
>>> chopper.config.multiplier = 3
>>> chopper.config.get_command_info('sync_edge')
{'command class': 'DictCommand',
'raw remote command': 'EDGE',
'set_dict': {'rise': 0, 'fall': 1, 'sine': 2},
'get_dict': {'rise': 0, 'fall': 1, 'sine': 2},
'index_dict': None
}
>>> chopper.config.sync_edge = 'rise'
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