Pass through a nearby orange portal to reach the platform, then look left down the hall.
You can wait for the platform and ride it through the hall, or you can warp to a stationary platform that's further down the hall by firing a blue portal onto the wall above the platform. Go to the other side of the room to find a hall with an electrified track for a moving platform. With the portal moved, the pellet should ricochet off the wall and bounce into the receptor. As soon as the pellet passes into the orange portal and out of the blue portal, quickly move the blue portal away from the slanted panel its currently on (move it anywhere). Next, position the orange portal on the wall panel directly under the pellet dispenser. First, place a blue portal on the angled wall panel under the pellet receptor, dead-center on the panel. You can use the faint red light on the ceiling as a guide for portal placement.In the first room of the testchamber is a high energy pellet dispenser as well as a receptor, both positioned on the ceiling. Before going through the newly-opened doorway, place a blue portal on the ceiling directly above the energy pellet receptor. The switch opens a door at the opposite end of the hall that leads to a room with the high energy pellet needed to activate the receptor at the top of the stairs. Grab the weighted storage cube and backtrack down the stairs (they're mysteriously back) to place the cube on top of the red floor switch. Drop into the orange portal from above the pit to fly through the blue portal and onto the mound with the storage cube.
Next, place an orange portal in the bottom of the pit formed by the receding stairs. Place a blue portal at the top of the nearest wall that's facing the weighted storage cube. The storage cube is a bit out of reach, but you can grab it with a momentum jump.
At the top of the stairs is a small room with a high energy pellet receptor and a weighted storage cube. For now, go left up the stairs (the stairs later recede into the floor, forming a pit). Right away you spot a red floor switch as the testchamber branches both left and right.
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