A planar test chamber has been set up to check the shapes of the pulses using different gas mixtures and pressures, and to test the electronics. The first picture below shows the set-up with a 5.5 MeV alpha source irradiating a drift volume of ca. 20x20x2 cm3. A photograph of the different layers of the chamber can be seen in the bottom picture. From top left to right bottom: The cathode (the strips are connected to each other), the GEM, the top cover plate, the anode strips, the drift frame and the bottom cover plate.