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Change-Id: Ic2d35960de6b33e4d61ad1920d2416e2d5ed1ded
This commit is contained in:
Oksana Shliakhtun 2024-08-20 13:51:00 +02:00
parent b63dca3b4e
commit 1c55b7dbf1
1 changed files with 33 additions and 0 deletions
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33
frappy_psi/SR830.py
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@ -15,6 +15,7 @@
#
# Module authors: Oksana Shliakhtun <oksana.shliakhtun@psi.ch>
# *****************************************************************************
"""Stanford Research Systems SR830 DS Lock-in Amplifier"""
import re
import time
@ -25,6 +26,11 @@ from frappy.errors import IsBusyError
def string_to_value(value):
"""
Converting the value to float, removing the units, converting the prefix into the number.
:param value: value
:return: float value without units
"""
value_with_unit = re.compile(r'(\d+)([pnumkMG]?)')
value, pfx = value_with_unit.match(value).groups()
pfx_dict = {'p': 1e-12, 'n': 1e-9, 'u': 1e-6, 'm': 1e-3, 'k': 1e3, 'M': 1e6, 'G': 1e9}
@ -40,6 +46,13 @@ class SR830_IO(StringIO):
class StanfRes(HasIO, Readable):
def set_par(self, cmd, *args):
"""
Set parameter.
Query commands are the same as setting commands, but they have a question mark.
:param cmd: command
:param args: value(s)
:return: reply
"""
head = ','.join([cmd] + [a if isinstance(a, str) else f'{a:g}' for a in args])
tail = cmd.replace(' ', '? ')
new_tail = re.sub(r'[0-9.]+', '', tail)
@ -149,6 +162,10 @@ class XY(StanfRes):
return IDLE, ''
def read_value(self):
"""
Read XY. The manual autorange implemented.
:return:
"""
if self.read_status()[0] == BUSY:
raise IsBusyError('changing gain')
reply = self.get_par('SNAP? 1, 2')
@ -166,11 +183,13 @@ class XY(StanfRes):
return int(self.get_par('SENS?'))
def read_range(self):
"""Sensitivity range value"""
idx = self.read_irange()
name = self.SEN_RANGE[idx]
return string_to_value(name)
def write_irange(self, irange):
"""Index of sensitivity from the range"""
value = int(irange)
self.set_par(f'SENS {value}')
self._autogain_started = time.time()
@ -178,6 +197,12 @@ class XY(StanfRes):
return value
def write_range(self, target):
"""
Setting the sensitivity range.
cl_idx/cl_value is the closest index/value from the range to the target
:param target:
:return: closest value of the sensitivity range
"""
target = float(target)
cl_idx = None
cl_value = float('inf')
@ -194,6 +219,7 @@ class XY(StanfRes):
return cl_value
def read_itc(self):
"""Time constant index from the range"""
return int(self.get_par(f'OFLT?'))
def write_itc(self, itc):
@ -201,11 +227,18 @@ class XY(StanfRes):
return self.set_par(f'OFLT {value}')
def read_tc(self):
"""Read time constant value from the range"""
idx = self.read_itc()
name = self.TIME_CONST[idx]
return string_to_value(name)
def write_tc(self, target):
"""
Setting the time constant from the range.
cl_idx/cl_value is the closest index/value from the range to the target
:param target: time constant
:return: closest time constant value
"""
target = float(target)
cl_idx = None
cl_value = float('inf')