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from qolab.hardware.basic import BasicInstrument
from qolab.hardware.multimeter import MultimeterSCPI
from qolab.hardware.scpi import SCPI_PROPERTY
from pyvisa import constants as pyvisa_constants
class HP_34401(MultimeterSCPI):
""" HP 34401 multimeter (same as Agilent) """
"""
rm = pyvisa.ResourceManager()
instr=rm.open_resource('ASRL/dev/ttyUSB0::INSTR')
"""
def __init__(self, resource, *args, **kwds):
super().__init__(resource, *args, **kwds)
self.config['Device model']='HP 34401'
self.resource.read_termination = '\r\n'
self.resource.baud_rate = 9600
self.resource.data_bits = 8
self.resource.parity = pyvisa_constants.Parity.none
self.resource.stop_bits = pyvisa_constants.StopBits.one
self.deviceProperties.update({'Function'})
Function = SCPI_PROPERTY(scpi_prfx='SENSe:FUNCtion', ptype=str, doc="""
Current measurement function (Voltmeter DC/AC, Currentmeter DC/AC, etc.
Important! When assigning, string should be quoted, i.e. use:
Function=\'"VOLT:DC"\'
Possible values:
"VOLTage:DC", same as "VOLT"
"VOLTage:DC:RATio"
"VOLTage:AC"
"CURRent:DC", same as "CURR"
"CURRent:AC"
"RESistance" (2-wire ohms)
"FRESistance" (4-wire ohms)
"FREQuency"
"PERiod"
"CONTinuity"
"DIODe"
"""
)
def toRemote():
self.write("SYSTem:REMote")
def toLocal():
self.write("SYSTem:LOCal")
Reading = SCPI_PROPERTY(scpi_prfx='SYSTem:REMote\n read', ptype=float, doc='Report current measurement', no_setter=True)
if __name__ == '__main__':
import pyvisa
print("testing")
rm = pyvisa.ResourceManager()
print(rm.list_resources())
instr=rm.open_resource('ASRL/dev/ttyUSB0::INSTR')
multimeter = HP_34401(instr)
print('------ Header start -------------')
print(str.join('\n', multimeter.getHeader()))
print('------ Header ends -------------')
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