Source code for instruments.Agilent34401A

#import visa
#import time
#import sys

[docs]class Agilent34401A(object):
    '''
    This class models the Agilent 34401A Multimeter.
    '''

    def __init__(self,res_manager,address='GPIB0::22::INSTR'):
        '''
        Constructor method

        :param res_manager: PyVisa resource manager
        :type res_manager: PyVisa resourceManager object
        :param address: SCPI address of instrument
        :type address: string
        '''
        self.active = False

        self.gpib = res_manager.open_resource(address)
        print(self.gpib.query('*IDN?'))
        self.gpib.write('*RST')
        self.gpib.write('*CLS')
        self.scalingfactor = 1

[docs]    def whoAmI(self):
        ''':returns: reference to device'''
        return 'DCMeter'

[docs]    def change_state(self):

        if self.active == True:
            self.active = False
        else:
            self.active = True

[docs]    def get_voltage(self,scaled=False,query_range=10,resolution=0.01):
        '''
        Queries the voltage of multimeter.

        :param scaled: Optional scaling
        :type scaled: Boolean
        :param query_range: range for query
        :type query_range: Integer
        :param resolution: resolution for query
        :type resolution: Float
        :returns: current voltage reading as float
        '''

        val = float(self.gpib.query('MEAS:VOLT:DC? '+str(query_range)+','+str(resolution)))

        if scaled==True:
            val = val*self.scalingfactor

        return val

[docs]    def get_current(self,query_range=1,resolution=0.000001):
        '''
        Queries the current reading of the multimeter

        :param query_range: range for query
        :type query_range: Integer
        :param resolution: resolution for query
        :type resolution: Float
        :returns: current reading as float
        '''
        return float(self.gpib.query('MEAS:CURR:DC? '+str(query_range)+','+str(resolution)))

[docs]    def get_feedback(self):
        '''
        Requirement for generic feedback
        '''
        return self.get_current()

[docs]    def set_scaling(self,factor=1):
        '''
        Sets the scaling factor of the multimeter instrument.

        :param factor: Desired factor
        :type factor: Float or Integer
        '''

        self.scalingfactor = factor

[docs]    def get_scaling(self):
        '''
        Gets the scaling factor.

        :returns: Scaling factor as Int or Float
        '''

        return self.scalingfactor


[docs]    def close(self):
        '''
        Release resource.
        '''

        self.gpib.close()


'''
Copyright (C) 2017  Robert Polster
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 3 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, see <http://www.gnu.org/licenses/>.
'''