... :Intelligent True On-line UPSModel: CHA-1000FeaturesCapacity (VA):1000VA,3000VA,6000VAUPS controlled by Digital Signal Processor (DSP) , fast sampling and fast Response ... of the UPS. Input / output voltage, Input / output frequency, On-line mode, Back up mode, Battery capacity, Load levelVisual Display (LCD ... load3. Transfer Time: 0 ms CHA-1000 Intelligent True on-line UPS