At least once a year. This is mandated by our accreditation (NVLAP). We
also have to
use a nationally accreditated calibration lab (we use Liberty Labs).

Bob Heller
3M Product Safety, 76-1-01
St. Paul, MN 55107-1208
Tel:  651- 778-6336
Fax:  651-778-6252

========================================================================


                                                                                
                                        
                    MartinJP@appliedbios                                        
                                        
                    ystems.com                To:     
emc-p...@majordomo.ieee.org                                       
                                              cc:     (bcc: Robert E. 
Heller/US-Corporate/3M/US)                        
                    05/22/2001 07:39 PM       Subject:     Antenna Calibration  
                                        
                    Please respond to                                           
                                        
                    MartinJP                                                    
                                        
                                                                                
                                        
                                                                                
                                        






How often do you calibrate your biconical and log periodic antennas?  Why
did you choose that interval?

Thanks

Joe Martin
EMC/Product Safety Engineer
Applied Biosystems



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