GRAPHTEC gl820 User Manual page 68

CHAPTER 3 Settings and Measurement
Level and Edge operations
In the Level operation, a trigger is assumed to be generated if the trigger conditions are met
when the START key is pressed.
In the Edge operation, a trigger is not assumed to be generated even if the trigger conditions are
met when the START key is pressed.
A trigger is assumed to be generated when the trigger conditions, after not being met, are met
again.
* A trigger is still assumed to be generated even if the trigger conditions are met once in the
Edge operation and then are no longer met.
Example: Rising
Trigger generation area
Measurement is
immediately
started in the
Level operation.
Trigger and Alarm operations
Rising
Falling
Win In
Win Out : Used to specify the upper and lower limits for each channel. When the input signal
3−32
If the START key is pressed here
An edge exceeding
the setting level is
required.
Measurement is
started from here in
the Edge operation.
: A trigger/alarm is generated when the input signal is higher than the specified level.
Trigger (alarm) generation area
CH.1
: A trigger/alarm is generated when the input signal is lower than the specified level.
Trigger (alarm) generation area
: Used to specify the upper and lower limits for each channel. When the input signal
level comes (or is) between these limits, a trigger/alarm is generated.
Trigger (alarm) generation area
CH.1
level goes (or is) out of these limits, a trigger/alarm is generated.
Trigger (alarm) generation area
CH.1
Example: Rising Edge And for 1CH and 2CH
If the START key is pressed here
1CH
Setting
For 1CH, a trigger is
level generated here.
2CH
Measurement starts (alarm generated)
Setting level
Measurement starts (alarm generated)
Setting level
Measurement starts (alarm generated)
Upper limit level
Lower limit level
Measurement starts (alarm generated)
Upper limit level
Lower limit level
For 1CH, a trigger is assumed to
be generated here, too.
For 2CH, a trigger
is generated here.
Measrement is started here.