From DaleFlow, a member of the NI Developer Zone, 6/24/2008:


Solution for the Python people here. ..as support is a bit vague to non-existent :smileymad:
 
Nidaq  with USB 6008
Reading more that 1 channel with the NIDAQ library in Python was a problem as the docs are really bad. Anyway I found a solution to do muli channel reads
My example  is with 3 channels so it could be easily adapted for more. 
 
I kept the max_num_samples deliberately small to see what was happening :-) so scale up
 
Enjoy  :smileyhappy:
 
 
 
        # initialize variables
        taskHandle = TaskHandle(0)
        max_num_samples =9
        data = numpy.zeros((max_num_samples,),dtype=numpy.float64)   
        # now, on with the program
        CHK(nidaq.DAQmxCreateTask("",ctypes.byref(taskHandle)))
        CHK(nidaq.DAQmxCreateAIVoltageChan(taskHandle,"Dev1/ai0:2","",          
                                           DAQmx_Val_Diff,            #DAQmx_Val_Diff,   #DAQmx_Val_RSE,       #DAQmx_Val_Cfg_Default,
                                           float64(-10.0),float64(10.0),
                                           DAQmx_Val_Volts,
                                           None))
       
               
        CHK(nidaq.DAQmxCfgSampClkTiming(taskHandle,"",float64(1000.0), DAQmx_Val_Rising,DAQmx_Val_FiniteSamps,uInt64(max_num_samples)))
                  #DAQmxCfgSampClkTiming(taskHandle,"",sampleRate,DAQmx_Val_Rising,DAQmx_Val_FiniteSamps,sampsPerChan);      
        CHK(nidaq.DAQmxStartTask(taskHandle))
        read = int32()
       
        CHK(nidaq.DAQmxReadAnalogF64(taskHandle,
                                     -1,
                                     float64(1.0),    #Timeout in seconds
                                     DAQmx_Val_GroupByScanNumber,       #DAQmx_Val_GroupByChannel,    #DAQmx_Val_GroupByScanNumber
                                     data.ctypes.data,
                                     max_num_samples,
                                     ctypes.byref(read),None))
       
       
        print "Acquired %d points"%(read.value)
       
        if taskHandle.value != 0:
            nidaq.DAQmxStopTask(taskHandle)
            nidaq.DAQmxClearTask(taskHandle)
       
        return data
	
1
Kudos! Thanks!