For this test, two gratings were actively aligned together to demonstrate a technique for aligning nested diffraction gratings in an active alignment module (AAM). The AAM consists of slots for the grating wafers and an exterior skeleton into which five picomotors are mounted in order to align sequential gratings to an initially installed, fixed reference grating. The AAM is shown in Fig. 5, where two of the five picomotors, which are used to control grating yaw, are visible on the top of the module and three motors are partially visible on the front of the module, which control pitch and roll actuation of the active grating. The step size of each picomotor is , which translates to angular step sizes of arc second in roll, pitch, and yaw. For this test, only one additional grating was installed and aligned to the reference grating, though the procedure could be repeated to add more gratings as desired. For an incidence angle of 1.5 deg, the two grating AAM stack intercepts 25 mm of the 44 mm (57%) illuminated azimuthal extent of the SPO and 3 mm of the 11 mm (27%) radial extent of the SPO, or of the total SPO beam. For the remainder of this paper, the AAM will refer to the entire module once the active grating was aligned with the reference grating and bonded into place, and the picomotors and springs were disengaged.