Ref :UM-CT7-11-001 Issue : 01 Date : 28/04/2011 Page 10 of 35 4.2.2 Delayed Start By default, triggering “measure” option invokes a 5 seconds delay before the measurement actually starts. The objective of this feature is the protection of the mirror. The user can set‐up and trigger the measurement still holding CT7 in his hands . When everything is ready, he may carefully place it on fragile telescope mirror, avoiding from rubbing the surface. Note that additional protection is provided by laying the CT7 on a pad of optical tissue with a one inch hole for the beam (see below) The remaining time before measurement is indicated by a count down on display.
The delay timer may be set between 0 and 30 seconds. 4.2.3 Wavelengths selection: Carts and Customized measurements The user can select 0 to 7 wavelengths to be used for measurement of reflection and 0 ..7 for scattering. However, at least one wavelength shall be selected either in reflectivity or in scattering. Once customized, given configuration may be named and saved. User can store up to 64 named Carts of customized measurements. The aim of the Cart operation is the following: assuming that the user has four telescopes (i.e. T1 … T3) to monitor and that each of them has several mirrors (i.e. M1 …
M8); he can prepare the following Carts (illustrated by actual screen‐shot from CT7‐Console): Even after a long time, without noting anything, the user unloading the CT7 memory in its PC will be able to extract all measurements pertaining to any mirror of a particular telescope and trace its evolution with time (through the date and time attached to each measurement). In this example, we have chosen to select the same measurement sequence for each mirror of the same telescope but this is not requested. The Cart operation is a powerful and simple way of keeping order and uniformity among measurements on the long term. This document is OPO property.
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