the MAMA and delay-line readouts of the STIS and COS detectors (Vallerga et al 2002, McPhate et al 2010). Pixel-based readouts introduce systematic effects in the centroiding and counting of photon events, which require some calibration and testing (paper 1, and Kuin and Rosen 2008, Breeveld et al 2010).

One engineering unit (NUV) and one flight unit for each channel were fabricated by Routes Astro-engineering. Functional tests were performed at the Canadian Space Agency David Florida Lab (DFL), and then were fully tested and calibrated in a specially equipped UV vacuum facility at the University of Calgary. This paper describes the calibration data and their analysis. The paper should be of interest in describing the functionality of the detectors and also for those interested in making observations with the instrument in orbit.

We reported in paper 1 on results from a laboratory version of the photon-counting detector system for the UVIT telescopes. In this paper we describe the calibration and performance of the engineering and flight hardware. The results we describe show the performance of the systems in various modes of operation, and should be useful in designing observing programs with UVIT.

The FUV system has its own flight telescope, 