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                   System 
                    620/600 
                    Function Cards 
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620650 
                  - 4 Channel Preamp with 2-Pole Butterworth Filter 
                   
                
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620654 
                  - 4 Channel Preamp with 6-Pole Butterworth Filter 
                 Both analog card 
                  types accept full-scale signals ranging from 5mV 
                  to 10.24V. As with all NEFF products the amplifier input circuits  
                  are protected against high frequency common mode noise. 
                 
                  
             
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