The pop-up window, which is obtained via the Utility Menu, allows changes to be made to the alarm levels. The alarm levels are defined by a threshold - the value below which no alarm is raised - and an increment value. These two values define a set of alarm bands. For the settings shown, the bands are:- 0.00-0.30 (no alarm), 0.30-0.50, 0.50-0.70, etc. When an alarm is acknowledged, the alarm level is increased by the increment value.