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... 2 Measurement of PMTs counting characteristics and selection of op erating p oint To select the operating point of the PMT, that is the optimal values of the high voltage supply and pulse discrimination threshold, the command run counting=hv value is provided in the program mass. ... Starting with the minimum voltage (say 550 V) run command run counting=550 for the measurement execution. ... It is recommended to take measurements for the set of values of 0.4, 0.6, 0.8, 1.0. ...

VISTA Telescope Mount ­ Factory testing prior to optics integration Paul Jeffers*a, Brian Stobiea, Stan Hermannb, Brad McCreightb a UK Astronomy Technology Centre, Royal Observatory, Blackford Hill, Edinburgh, EH9 3HJ, UK b VertexRSI ­ General Dynamics C4 Systems, 1217 Digital Drive, Richardson, TX 75081, USA ABSTRACT VISTA1 is a survey telescope which will deliver 0.5 arc second images over a 2 degree diameter unvignetted field of view. ... Thermal affects during the period of the test. ...