217 lines
7.2 KiB
Python
217 lines
7.2 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# *****************************************************************************
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# This program is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by the Free Software
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# Foundation; either version 2 of the License, or (at your option) any later
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# version.
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#
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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# details.
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#
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# You should have received a copy of the GNU General Public License along with
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# this program; if not, write to the Free Software Foundation, Inc.,
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# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# Module authors:
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# Daniel Margineda <daniel.margineda@psi.ch>, Oksana Shliakhtun <oksana.shliakhtun@psi.ch>
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# *****************************************************************************
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"""Signal Recovery SR7270: lockin amplifier for AC susceptibility"""
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from frappy.core import Readable, Parameter, FloatRange, TupleOf, \
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HasIO, StringIO, Attached, IntRange, BoolType, Writable, EnumType
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class SR7270_IO(StringIO):
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end_of_line = b'\x00'
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identification = [('ID', r'.*')] # Identification
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class Ametek(StringIO):
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def get_par(self, cmd): # remove dash from terminator
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reply = StringIO.communicate(self, cmd)
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status = self._conn.readbytes(2, 0.1) # get the 2 status bytes
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return reply + ';%d;%d' % tuple(status)
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def comm(self, cmd):
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reply, status, overload = self.get_par(cmd).split(';')
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if overload != '0':
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self.status = self.Status.WARN, f'overload {overload}'
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self.status = self.Status.IDLE, ''
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return reply
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class XY(HasIO, Readable):
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ioClass = SR7270
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# parameters required an initial value but initwrite write the default value for polled parameters
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value = Parameter('X, Y', datatype=TupleOf(FloatRange(unit='V'), FloatRange(unit='V')))
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# separate module (Writable)
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class Frequency(Ametek, Writable):
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value = Parameter('exc_freq_int', FloatRange(0.001, 250e3, unit='Hz'),
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readonly=False, default=1000) # initwrite=True,
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def read_freq(self):
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return self.comm('OF.')
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def write_freq(self, value):
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self.comm(f'OF. {value}')
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return value
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# separate module (Writable)
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class Amp(Ametek, Writable):
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value = Parameter('exc_volt_int',
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FloatRange(0.00, 5, unit='Vrms'),
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readonly=False, default=0.1) # initwrite=True,
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# unify the following
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range = Parameter('sensitivity value', FloatRange(0.00, 1, unit='V'), default=1)
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irange = Parameter('sensitivity index', IntRange(0, 27), readonly=False, default=25)
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autorange = Parameter('autorange_on', EnumType('autorange', off=0, soft=1, hard=2), readonly=False,
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default=0) # , initwrite=True
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# unify the following
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tc = Parameter('time constant value', FloatRange(10e-6, 100), unit='s', default=0.1)
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itc = Parameter('time constant index', IntRange(0, 30), default=14, readonly=False)
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nm = Parameter('noise mode', BoolType(), readonly=False, default=0)
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phase = Parameter('Reference phase control', FloatRange(-360, 360, unit='deg'),
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readonly=False, default=0)
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# convert to enum
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vmode = Parameter('control mode', IntRange(0, 3), readonly=False, default=3)
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# dac = Parameter('output DAC channel value', datatype=TupleOf(IntRange(1, 4), FloatRange(0.0, 5000, unit='mV')),
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# readonly=False, initwrite=True, default=(3,0))
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# dac = Parameter('output DAC channel value', FloatRange(-10000, 10000, unit='mV'),
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# readonly=False, initwrite=True, default=0)
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# OS - there should be parameter+command IMODE before
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def read_value(self):
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reply = self.comm('XY.').split(',')
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x = float(reply[0])
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y = float(reply[1])
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if self.autorange == 1: # soft
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if max(abs(x), abs(y)) >= 0.9 * self.range and self.irange < 27:
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self.write_irange(self.irange + 1)
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elif max(abs(x), abs(y)) <= 0.3 * self.range and self.irange > 1:
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self.write_irange(self.irange - 1)
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self._x.value = x # to update X,Y classes which will be the collected data.
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self._y.value = y
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return x, y
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def write_autorange(self, value):
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if value == 2: # hard
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self.comm('AS') # put hardware autorange on
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self.comm('AUTOMATIC. 1')
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else:
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self.comm('AUTOMATIC. 0')
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return value
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def read_autorange(self):
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reply = self.comm('AUTOMATIC')
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# determine hardware autorange
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if reply == 1: # "hardware auto range is on"
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return 2 # hard
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if self.autorange == 0: # soft
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return self.autorange() # read autorange
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return reply # off
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# oscillator amplitude module
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def read_amp(self):
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reply = self.comm('OA.')
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return reply
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def write_amp(self, value):
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self.comm(f'OA. {value}')
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return value
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# external output DAC
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# def read_dac(self):
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# # reply = self.comm('DAC %g' % channel) # failed to add the DAC channel you want to control
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# reply = self.comm('DAC 3') # stack to channel 3
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# return reply
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# def write_dac(self, value):
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# # self.comm('DAC %g %g' % channel % value)
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# self.comm('DAC 3 %g' % value)
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# return value
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# sensitivity module
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def read_range(self):
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reply = self.comm('SEN.')
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return reply
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def write_irange(self, value):
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self.comm('SEN %g' % value)
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self.read_range()
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return value
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def read_irange(self):
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reply = self.comm('SEN')
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return reply
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# time constant module/ noisemode off or 0 allows to use all the time constant range
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def read_nm(self):
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reply = self.comm('NOISEMODE')
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return reply
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def write_nm(self, value):
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self.comm('NOISEMODE %d' % int(value))
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self.read_nm()
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return value
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def read_tc(self):
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reply = self.comm('TC.')
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return reply
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def write_itc(self, value):
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self.comm('TC %g' % value)
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self.read_tc()
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return value
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def read_itc(self):
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reply = self.comm('TC')
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return reply
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# phase and autophase
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def read_phase(self):
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reply = self.comm('REFP.')
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return reply
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def write_phase(self, value):
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self.comm('REFP %d' % round(1000 * value, 0))
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self.read_phase()
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return value
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def aphase(self):
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"""auto phase"""
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self.read_phase()
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reply = self.comm('AQN')
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self.read_phase()
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# voltage input configuration 0:grounded,1=A,2=B,3=A-B
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# def read_vmode(self):
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# reply = self.comm('VMODE')
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# return reply
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def write_vmode(self, value):
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self.comm(f'IMODE {0}') # voltage enabled
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self.comm(f'VMODE {value}')
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return value
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class Comp(Readable):
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enablePoll = False
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value = Parameter(datatype=FloatRange(unit='V'))
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class arg(Readable):
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enablePoll = False
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value = Parameter(datatype=FloatRange(unit=''))
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