added early draft of the multimeter class and some readings for hp_34401 multimeter

2 files changed, 58 insertions, 0 deletions

diff --git a/qolab/hardware/multimeter/__init__.py b/qolab/hardware/multimeter/__init__.py
new file mode 100644
index 0000000..3c174f4
--- /dev/null
+++ b/qolab/hardware/multimeter/__init__.py
@@ -0,0 +1,30 @@
+from qolab.hardware.scpi import SCPIinstr
+from qolab.hardware.basic import BasicInstrument
+
+class Multimeter(BasicInstrument):
+    def __init__(self, *args, **kwds):
+        BasicInstrument.__init__(self, *args, **kwds)
+        self.config['Device type']='Multimeter'
+        self.config['FnamePrefix'] = 'Multimeter'
+        self.config['Device model'] = 'Generic Multimeter Without Hardware interface'
+        self.config['FnamePrefix'] = 'multimeter'
+        self.deviceProperties.update({})
+    # Minimal set of methods to be implemented.
+    pass
+
+class MultimeterSCPI(SCPIinstr, Multimeter):
+    """     
+    Do not instantiate directly, use
+    rm = pyvisa.ResourceManager()
+    MultimeterSCPI(rm.open_resource('TCPIP::192.168.0.2::INSTR'))
+    """
+    pass
+    def __init__(self, resource, *args, **kwds):
+        SCPIinstr.__init__(self, resource)
+        Multimeter.__init__(self, *args, **kwds)
+        self.config['DeviceId'] = str.strip(self.idn)
+
+from .hp_34401 import HP_34401
+
+
+
diff --git a/qolab/hardware/multimeter/hp_34401.py b/qolab/hardware/multimeter/hp_34401.py
new file mode 100644
index 0000000..ad11614
--- /dev/null
+++ b/qolab/hardware/multimeter/hp_34401.py
@@ -0,0 +1,28 @@
+from qolab.hardware.basic import BasicInstrument
+from qolab.hardware.multimeter import MultimeterSCPI
+from qolab.hardware.scpi  import SCPI_PROPERTY
+
+class HP_34401(MultimeterSCPI):
+    """ HP 34401 multimeter (same as Agilent) """
+    """
+    rm = pyvisa.ResourceManager()
+    instr=rm.open_resource('ASRL/dev/ttyUSB0::INSTR', baud_rate = 9600)
+    """
+    def __init__(self, resource, *args, baud_rate=9600, data_bits=8, parity=None, stop_bits=1, timeout=1, **kwds):
+        super().__init__(resource, *args, **kwds)
+        self.config['Device model']='hp 34401'
+        # self.resource.read_termination='\n'
+        self.deviceProperties.update({})
+
+    measurement = 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', baud_rate = 9600)
+    multimeter = HP_34401(instr)
+    print('------ Header start -------------')
+    print(str.join('\n', multimeter.getHeader()))
+    print('------ Header ends  -------------')