Qmax Test Equipments Pvt Ltd. Manufactures PXI-6602 Counter/Timers with Digital Debouncing Filters. Qmax Test Equipments Pvt Ltd. Is ISO 9001 certified company and its marketing and customer support operations are ISO 9002 certified. These PXI-6602 Counter/Timers with Digital Debouncing Filters consist of 8-channel, 32-bit up/down counter/timer module and 32 digital I/O lines [5 V TTL/CMOS] -- 8 dedicated, 24 shared with counter/timers. It falls under the category of PXI Instruments. This instrument possesses 80 MHz maximum source frequency with 3 simultaneous high-speed DMA transfer capability.