The utility model discloses a chassis which comprises a front wall, a rear wall, a top panel, a bottom panel, a left side wall and a right side wall. The chassis further comprises an upper baffle plate, a middle baffle plate and a lower baffle plate which are fixed inside the chassis from the top down, wherein the upper baffle plate is provided with a shell used for installing a waveform generation device; the middle baffle plate is provided with shells used for respectively installing a voltage class adjusting device, a virtual meter device, a low-voltage PLC attenuation simulation device, a low-voltage PLC length simulation device, an RS485 line length simulation device and a carrier interference simulation device in sequence from the bottom up; and the lower baffle plate is provided with shells used for respectively installing a voltage stabilizing and transformation device and a serial server device in sequence from the bottom up. The chassis disclosed by the utility model solves a problem of difficult wiring in simulation testing for an acquisition system, thereby improving the efficiency of simulation testing, and saving the labor cost.