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Measuring acceleration data using Nidaq 6323

		
	
				

			

									
					    JaganKB
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Nov 13, 2024 
				
			
			
		

		
		                     
				
        		

		    
		    		    

		      		            		        
Category: Hardware

    		        		            		    
Product Number:  ADXL358 

    		        		    		    

		    		    
		    			

			    
Hi


I'm trying to use Nidaq 6323 to read the acceleration data from ADXL358. Since Nidaq directly reads analog signal as voltage, I'm facinf issues with interfacing the accelerometer with the daq. I notice that when I divide the measured voltage with the sensitivity then all the three axes are reporting ~11 (Raw_voltage/sensitivity: 1V/0.08=10g?). Even when I place the accelerometer on a flat surface I get the same reading.


 


(Note: I have set the range as +/- 10g, put both the ST1 and ST2 pins to low and STBY to high)

			

			
									
		                             
                        

    

                                            
                 hardware
                
                                                    
                 reading
                
                                                    
                 ADXL358
                
                                                    
                 accelerometer
                
                                
            

    
    
		


				
				        
        		

			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		


        
        
        
    
					

			





















	

	

					



			


				
	









	
    
	

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Dec 5, 2024 4:53 AM
            
            
						
			            		
    
		
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    Hello  thanks for your question,

    

    First of all I would suggest to crosscheck the supply setup; this a ratiometric device to  V1P8ANA, how is the sensor supplied? Is the ADC properly referenced to V1P8ANA? Is the power sequenced as shown on page 12 of the ADXL358 datasheet?

     
     Also note that the 0g offset is expected to be     
        \frac{V_{1P8ANA}}{2}=0.9\text{ V}
    
    
    
    
  in addition to the 0g error of 125mg.
     
     That being said to properly interpretate that ~11 measurement take in to account the sensibility (1/0.08 =12.5g) and substract the 0g errors mentioned above.
     
     An example with a properly tuned supply under normal conditions and ignoring ADC accuracy details :
     
      A 1.2 V raw measurement from the ADC would be translated as follows:
     
         
        \frac{(1.2-0.9)}{0.08}\pm0.125g\text{ }
    
    
    
    


    Hope this helps solve the situation,

    Mario SM
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
						
				
				
		
		
    
			
		
    
	
    

    

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