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Instant Drop in SWV



		

			

									
					    AE104
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Sep 19, 2023 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello,
    

    During SWV measurements, after certain point which is indicated on the figure with red line, the SWV current response starts to go down instantly. When I do the same measurements with PalmSens, the curve continue to goes up. I suspect that I should I add a autorange script in the main script. Or the problem is different?
    

     
    
									
			        
		
    

				
						
        

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			


				
	









	
      
	

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													0
							
			
				
									
							        
			
			
			
        
            
						
                            
            
            				
            
                on Sep 19, 2023 5:36 PM
            
            
					
        
	
        

		
		
        
					
        I control emstat pico with Bluetooth and integrated on a custom PCB. Here is the SWV scripts,
        

        

        char const * Square_Wave =  "e\n"
							"var p\n"
							"var c\n"
							"var f\n"
							"var r\n"
							"set_pgstat_mode 3\n"
							"set_max_bandwidth 2400\n"
							"set_range ba 100n\n"
							"set_e 0\n"
							"cell_on\n"
							"wait 1\n"
							"meas_loop_swv p c f r 0 1 50m 50m 5\n"
							"pck_start\n"
							"pck_add p\n"
							"pck_add c\n"
							"pck_end\n"
							"endloop\n"
							"cell_off\n"
							"\n";
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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													+1
							
			
				
									
							        
			
			
			
          
            
						
                            
            
            				
            
                on Sep 20, 2023 3:45 AM
            
            
												
						in reply to AE104
					
									
          
	
          

		
		
          
					
          That is correct, autoranging may help here.
          

          Try adding the following command just after "set_range":
          "set_autoranging ba 100n 1m"
          

          This will tell the device to enable autoranging on the WE current signal, and that you would like to limit ranging to currents within 100 nA and 1 mA.
          

          

          Kind regards,
          Hielke
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
				
						
						
				
				
		
		
          
			
		
          
	
          

          

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