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Preliminary test results on spectral resolution of the Low Energy Transmission Grating Spectrometer on board of AXAF

The AXAF-payload consisting of a high resolution telescope, two different transmission gratings and two imaging detection systems, has been extensively tested between mid December 1996 and the end of April 1997. In this paper we report a few preliminary results on the resolution of the low energy transmission grating spectrometer. The measurements reported here utilize different x-ray sources and different detector systems. The resolving power at long wavelength ((Delta) (lambda) at 130 angstrom) equals 0.074 angstrom.