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first version of lakeshore 340 driver

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Change-Id: Ie9a68be61e142802b2e71420b87623b7a4b4f645
This commit is contained in:
Oksana Shliakhtun 2023-01-24 18:13:34 +01:00
parent ee708f7b02
commit a384664639
2 changed files with 209 additions and 0 deletions
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36
cfg/ls340_cfg.py Normal file
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Node('ls340test.psi.ch',
'ls340 test',
'tcp://5000',
)
Mod('io',
'frappy_psi.lakeshore.Ls340IO',
'communication to ls340',
uri = 'tcp://ldmprep56-ts:3002'
)
Mod('T',
'frappy_psi.lakeshore.TemperatureLoop340',
'sample temperature',
output_module = 'Heater',
target = Param(max=470),
io = 'io',
channel = 'A',
)
Mod('T_cold_finger',
'frappy_psi.lakeshore.Sensor340',
'cold finger temperature',
io = 'io',
channel = 'B'
)
Mod('Heater',
'frappy_psi.lakeshore.HeaterOutput',
'heater output',
channel = 'A',
io = 'io',
resistance = 50,
max_power = 50,
current = 1
)

173
frappy_psi/lakeshore.py Normal file
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# *****************************************************************************
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# Module authors:
# Oksana Shliakhtun <oksana.shliakhtun@psi.ch>
# *****************************************************************************
from math import log2
from frappy.core import Readable, Parameter, IntRange, EnumType, FloatRange, \
StringIO, HasIO, StringType, Property, Writable, Drivable, IDLE, ERROR, \
Attached
from frappy_psi.mixins import HasOutputModule, HasControlledBy
class Ls340IO(StringIO):
"""communication with 340CT"""
end_of_line = '\r'
wait_before = 0.05
identification = [('*IDN?', r'LSCI,MODEL340,.*')]
class Sensor340(HasIO, Readable):
"""A channel of 340TC"""
# define the communication class to create the IO module
ioClass = Ls340IO
channel = Property('lakeshore channel', StringType())
# define or alter the parameters
# as Readable.value exists already, we give only the modified property 'unit'
value = Parameter(unit='K')
def read_value(self):
reply = self.communicate(f'KRDG?{self.channel}')
return float(reply)
def read_status(self):
c = int(self.communicate(f'RDGST? {self.channel}'))
if c >= 128:
return ERROR, 'units overrange'
if c >= 64:
return ERROR, 'units zero'
if c >= 32:
return ERROR, 'temperature overrange'
if c >= 16:
return ERROR, 'temperature underrange'
if c >= 2:
return ERROR, 'old reading'
if c >= 1:
return ERROR, 'invalid reading'
return IDLE, ''
class HeaterOutput(HasControlledBy, HasIO, Writable):
loop = Property('lakeshore loop', IntRange(1, 2), default=1)
channel = Property('attached channel', StringType())
max_power = Parameter('max heater power', datatype=FloatRange(0, 100), unit='W', readonly=False)
value = Parameter('heater output', datatype=FloatRange(0, 100), unit='W')
target = Parameter('manual heater output', datatype=FloatRange(0, 100), unit='W')
resistance = Property('heater resistance', datatype=FloatRange(10, 1000))
current = Property('heater current', datatype=FloatRange(0, 2))
_range = 0
MAXCURRENTS = {1: 0.25, 2: 0.5, 3: 1.0, 4: 2.0}
RANGES = {1: 1e4, 2: 1e3, 3: 1e2, 4: 1e1, 5: 1}
SETPOINTLIMS = 999
max_current = 0
STATUS_MAP = {
0: (IDLE, ''),
1: (ERROR, 'Power supply over voltage'),
2: (ERROR, 'Power supply under voltage'),
3: (ERROR, 'Output digital-to-analog Converter error'),
4: (ERROR, 'Current limit digital-to-analog converter error'),
5: (ERROR, 'Open heater load'),
6: (ERROR, 'Heater load less than 10 ohms')
}
def earlyInit(self):
super().earlyInit()
self.CHOICES = sorted([(maxcurrent ** 2 * factor, icurrent, irange)
for irange, factor in self.RANGES.items()
for icurrent, maxcurrent in self.MAXCURRENTS.items()])
def write_max_power(self, max_power):
prev = 0
for i, (factor, icurrent, irange) in enumerate(self.CHOICES):
power = min(factor * self.resistance, 2500 / self.resistance)
if power >= max_power:
if prev >= max_power * 0.9 or prev == power:
icurrent, irange = self.CHOICES[i - 1][1:3]
break
prev = power
self._range = irange
# CLIMIT + RANGE (using setpoint limit 999)
self.communicate(f'CLIMIT {self.loop},{self.SETPOINTLIMS},0,0,{icurrent},{irange}; RANGE {irange};'
f'CDISP {self.loop},1,{self.resistance},0;CDISP?{self.loop}')
return self.read_max_power()
def read_max_power(self):
setplimit, _, _, icurrent, irange = [
float(s) for s in self.communicate(f'CLIMIT? {self.loop}').split(',')]
# max_power from codes disregarding voltage limit:
self._max_power = self.MAXCURRENTS[icurrent] ** 2 * self.RANGES[irange] * self.resistance
# voltage limit = 50V:
max_power = min(self._max_power, 2500 / self.resistance)
return max_power
def set_range(self):
self.communicate(f'RANGE {self._range}; RANGE?')
def percent_to_power(self, percent):
return min((percent / 100) ** 2 * self._max_power,
2500 / self.resistance)
def power_to_percent(self, power):
return (power / self._max_power) ** (1/2) * 100 # limit
def read_value(self):
return self.percent_to_power(float(self.communicate(f'HTR?')))
def read_status(self):
return self.STATUS_MAP[int(self.communicate(f'HTRST?'))]
def write_target(self, target):
self.self_controlled()
self.write_max_power(self.max_power)
self.set_heater_mode(3)
self.set_range()
percent = self.power_to_percent(target)
reply = self.communicate(f'MOUT {self.loop},{percent:g};MOUT? {self.loop}')
return self.percent_to_power(float(reply))
def set_heater_mode(self, mode):
self.communicate(f'CSET {self.loop},{self.channel},1,1,0; CMODE {self.loop},{int(mode)}; CMODE?{self.loop}')
class TemperatureLoop340(HasOutputModule, Sensor340, Drivable):
target = Parameter(unit='K')
# max_power = Parameter('max heater power', datatype=FloatRange(0, 100), unit='W', readonly=False)
# max_current = Parameter('max heater current', datatype=float, unit='A', readonly=False)
loop = Property('lakeshore loop', IntRange(1, 2), default=1)
def write_target(self, target):
out = self.output_module
if out.controlled_by != self.name:
out.write_target(0)
out.set_heater_mode(1)
out.write_max_power(out.max_power)
self.activate_output()
out.set_range()
reply = self.communicate(f'SETP {self.loop},{target};SETP? {self.loop}')
return float(reply)
def read_target(self):
return float(self.communicate(f'SETP?{self.loop}'))