GRAPHTEC midi LOGGER GL240 User Manual page 96

CHAPTER 3 Settings and Measurement
Dead zones of trigger and alarm levels
Trigger and alarm levels are provided with a dead zone in order to prevent false detection due to noise.
The following figure shows the dead zone.
<Mode: Rising>
Trigger (alarm) level
Dead zone level
<Mode: Falling>
<Mode: Rising>
Trigger (alarm) level
•
The upper limit values within the mode range and the lower limit values out of the mode range are dead
zone level as well.
•
When the detected alarm drops below the dead zone level, it is cleared. (When the alarm is not retained)
<Example>When measuring temperature, the level released after the alarm generated is shown below.
• Rising setting: Setting value -0.3℃
• Falling setting: Setting value +0.3°C
•
In the case of pulse, dead zone is not provided.
3-54
Trigger (alarm) point
Dead zone level
<Voltage>
• Level setting value 1% of negative range
(1V range: Level setting value -0.01V)
<Temperature>
• Level setting value -0.3°C
<Mode: Rising>
<Voltage>
• Level setting value 1% of positive range
(1V range: Level setting value +0.01V)
<Temperature>
• Level setting value +0.3°C
Trigger (alarm) point