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Bruker_B-MC1/Bruker_B-MC1.py

+#!/usr/bin/env python
+#editor Timo B.
+#self.wait(0.1) ## added to reduce fails due to communication losses
+import InstrumentDriver
+from VISA_Driver import VISA_Driver
+import visa
+from InstrumentConfig import InstrumentQuantity
+
+__version__ = "0.0.1"
+
+class Error(Exception):
+	pass
+
+class Driver(VISA_Driver):
+	""" This class implements the Lakeshore 475 driver"""
+	
+	def performOpen(self, options={}):
+		"""Perform the operation of opening the instrument connection"""
+		VISA_Driver.performOpen(self, options=options)
+
+	def performClose(self, bError=False, options={}):
+		"""Perform the operation of opening the instrument connection"""
+		self.writeAndLog("PTC= 0.")
+		VISA_Driver.performClose(self, bError, options=options)
+
+	
+	def performGetValue(self, quant, options={}):
+		"""Perform the Get Value instrument operation"""
+		try:
+			if (quant.name in ('Output unit','Absolute deviation','Relative deviation','offset in B-Field calculation')):
+				return quant.getValue()
+			value=self.askAndLog(quant.get_cmd)
+			l=value.split(' ')
+			if len(l)<2:
+				return 0
+			value=float(l[-1])
+			if l[0] == '-':
+				value= (-1)*value
+			if (quant.name in ('B-Field')):
+				offset=self.getValue('offset in B-Field calculation') #7mT war bei test und ist jetzt standard
+				params=[-2.14236783e-04,-1.32015291e-03,1.80024778e+01,-5.85129355e+00]
+				magfield=params[3]+params[2]*value+params[1]*value**2+params[0]*value**3
+				magfield=round(magfield,3)
+				magfield-=offset
+				return magfield
+			return value
+		except Error as e:
+			return quant.getValue()
+
+
+	#0.1A + 1% von set wert
+	def performSetValue(self, quant, value, sweepRate=0.0, options={}):
+		"""Perform the set value operation"""
+		# check type of quantity
+		try:
+			if (quant.name in ('B-Field','Current')):
+				deviation=[self.getValue('Absolute deviation'),self.getValue('Relative deviation')/100] #0.1A + 1% von set wert ist standart
+				value=round(float(value),3)
+				if (quant.name in ('B-Field')):
+					offset=self.getValue('offset in B-Field calculation') #7mT war bei test und ist jetzt standart
+					value+=offset
+					params=[1.87879038e-09,2.49701790e-07,5.55849318e-02,3.27814017e-01]
+					current=params[3]+params[2]*value+params[1]*value**2+params[0]*value**3
+					current=round(current,3)
+					self.writeAndLog(quant.set_cmd.replace('<*>', str(current)))
+					self.wait(0.1) ## added to reduce fails due to communication losses
+					self.waitForReachingValue(quant,current,deviation)# here often an error occurs. Chekc the function!
+					value-=offset
+				else: 
+					self.writeAndLog(quant.set_cmd.replace('<*>', str(value)))
+					self.wait(0.1) ## added to reduce fails due to communication losses
+					self.waitForReachingValue(quant,value,deviation)
+			elif (quant.name in ('max Current Rate')):
+				self.writeAndLog(quant.set_cmd.replace('<*>', str(round(value,1))))
+			return value
+		except Error as e:
+			return value
+			
+	def waitForReachingValue(self, quant,value, deviation):
+		present=self.askAndLog(quant.get_cmd)
+		l=present.split(' ')
+		if len(l)<2: 
+			self.writeAndLog(quant.set_cmd.replace('<*>', str(0)))
+			l[-1]='0'
+		present=float(l[-1])
+		avalue=abs(value)
+		while not ((avalue-deviation[0]-deviation[1]*avalue) < present < (avalue+deviation[0]+deviation[1]*avalue)) and not self.isStopped() :
+			self.wait(1) #wait till new request of current value, set from 0.3 to 1, since the power supply cannot answer so fast
+			present=self.askAndLog(quant.get_cmd)
+			l=present.split(' ')
+			present=float(l[-1])
+		if self.isStopped():
+			self.writeAndLog(quant.set_cmd.replace('<*>', str(0)))
+		
+if __name__ == '__main__':
+	pass
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