| Standard AT20 | 
            Dual Channel, TTL/CMOS & Adjustable Output Module | 
        
        
            | Optional L82 | 
            Dual Channel, 820 nm Optical Output Module | 
        
        
            | L130 | 
            Dual Channel, 1300 nm Optical Output Module | 
        
        
            | AT35 | 
            Dual Channel, TTL/35 V High Voltage Output Module | 
        
        
            | AT45 | 
            Dual Channel, 45 V High and Low Impedance Voltage Output Module (limited to 4 channels) | 
        
        
            | TZ50 | 
            Dual Channel, High Current TTL/CMOS (for driving 50 ohm loads) & Adjustable Output Module | 
        
        
            | TZ35 | 
            Dual Channel, High Current TTL/CMOS (for driving 50 ohm loads) & 35 V High Voltage Output Module |