GRAPHTEC GL840 - Page 132

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CHAPTER 3 Settings and Measurement
(3)-1 Start side source setting
This is used to specify trigger conditions to start data capture.
Selection item Description
Off Starts capturing data unconditionally when you press the [Start/Stop] key.
Level Starts capturing data when a specied level is reached.
-> When Level is selected, the condition for each channel must be set.
Refer to “Trigger Level Settings/Alarm Level Settings” desdcribed below.
Alarm Starts capturing data when an alarm is generated in the specied alarm port.
External Input Starts capturing data when an input signal is received from an external trigger terminal.
* A trigger is established at a transition from 5 V (open) to 0 V (shorted to the ground).
A falling edge operation occurs.
Date Starts capturing data when specied date and time arrives.
Weekly Starts capturing data at the specied time on days of week for which On is set.
Example: On is set for Mon, Tue, Wed, Thu, and Fri, Off is set for Sun and Sat, and 9:00 is
set as the time.
Starts capturing data at 9:00 on weekdays. Does not start capturing data on Sat
and Sun.
Duration Starts capturing data when a specied length of time elapses.
(3)-2 Stop side source setting
This is used to specify trigger conditions to stop data capture.
Selection item Description
Off Stops capturing data unconditionally when you press the [Start/Stop] key.
Level Stops capturing data when a specied level is reached.
-> When Level is selected, the condition for each channel must be set.
Refer to “Trigger Level Settings/Alarm Level Settings” desdcribed below.
Alarm Stops capturing data when an alarm is generated in the specied alarm port.
External Input Stops capturing data when an input signal is received from an external trigger terminal.
* A trigger is established at a transition from 5 V (open) to 0 V (shorted to the ground).
A falling edge operation occurs.
Date Stops capturing data when specied date and time arrives.
Weekly Stops capturing data at the specied time on days of week for which On is set.
Example: On is set for Mon, Tue, Wed, Thu, and Fri, Off is set for Sun and Sat, and 9:00 is
set as the time.
Starts capturing data at 9:00 on weekdays. Does not stop capturing data on Sat
and Sun..
Duration Stops capturing data when a specied length of time elapses.
•
When External Input is used as the trigger source, no stop trigger is accepted for 50 ms after capture is
started.
•
When the start trigger is External Input, data is captured at sampling intervals (xed to 30 seconds if they
are more than 30 seconds) and retained temporarily.
This retained data is refreshed at sampling intervals (xed to 30 seconds if they are more than 30
seconds).
Since the external trigger input operation conducts detection at 10 ms intervals asynchronously from
sampling, the retained data becomes the rst point when an external trigger is detected. Starting from
this point, data is captured at sampling intervals.
•
This retained data is refreshed at sampling intervals (xed to 30 seconds if they are more than 30
seconds).
•
When a trigger with a level value is set on the remote terminal (GLT400), it is detected at the fastest 500
ms interval. If the sampling interval faster than 500ms is set, triggers and alarms may not be detected
depending on the signal cycle. The detection may be further delayed depending on the communication
environment.
•
If the remote terminal (GLT400) is enabled, the stop is delayed because it stops after receiving the data
from the remote terminal at the time when the stop trigger is detected.