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Question about AD8495



		

			

									
						Kazu
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on Jan 31, 2018 
				
			
			
		


				
		

		    		    
		    
		    	
			
Hi All,

 
I have a question about the AD8495. Please take a look at the attachment.

 
I think it is not out of spec, but I would like to know the cause of these variation.

 
Regards,

 
Kazu

								


				
							QuestionaboutAD8495.pdf
					
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	

		
	











	

	

					



			








	
	
	
	



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                                 Analog Employees 
                                
                            
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                on Feb 18, 2018 7:34 AM
            
            
					
    
	
    

		
		
    
					
    Hi Kazu,
    
 
    For a measurement temperature range of 0 to 220degC, and using the equation Vout(mV) = a0 + a1*T+a2*T^2+a3*T^3+a4*T^4+a5*T^5+a6*T^6 where T is the measurement temperature:
    
 
    
 
    The error from using this polynomial is about +/-1.5mV over the whole measurement range.  
    
 
    If you are still having issues after implementing this equation, I'd be interested to see the newest data in the plot that you originally sent.  
    
 
    Did you try swapping out the precision source?  Do you have a way of measuring what is actually coming out of that source?  
    
 
    Regards,
    
 
    Jordyn
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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													0
							
			
				
									
							        
            
                                                                                                        
      
                            
    • 
                                 Analog Employees 
                                
                            
      • 
                        
     
                                                           			
			                            
                        
                on Feb 18, 2018 7:34 AM
            
            
					
    
	
    

		
		
    
					
    Hi Kazu,
    
 
    For a measurement temperature range of 0 to 220degC, and using the equation Vout(mV) = a0 + a1*T+a2*T^2+a3*T^3+a4*T^4+a5*T^5+a6*T^6 where T is the measurement temperature:
    
 
    
 
    The error from using this polynomial is about +/-1.5mV over the whole measurement range.  
    
 
    If you are still having issues after implementing this equation, I'd be interested to see the newest data in the plot that you originally sent.  
    
 
    Did you try swapping out the precision source?  Do you have a way of measuring what is actually coming out of that source?  
    
 
    Regards,
    
 
    Jordyn
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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