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3
1.3
Definitions of VOD Settings
This section will discuss the meaning of each setting.
Trigger Level is the threshold that the signal will cross to indicate a valid trigger. For VOD, the typical setting for Trigger Level is 95%.
Pre-Trigger Time is the amount of time of the Total Time available for each test that will be captured prior to the trigger point. For VOD, the typical
setting for Pre-Trigger Time is 25%
Number of Tests is a number from 1 to 16 that the total memory of the unit is divided into. The lower the Number of Tests, the larger number of
points will be recorded per test. The user needs to ensure that the amount of time is sufficient to capture the test which includes the amount of Pre-
Trigger Time and the Total Time.
Recording Rate is the number of points captured per second. The faster the Recording Rate, the shorter the amount of time within each test. For
VOD, the typical setting for Recording Rate is 1 MHz or or 2 MHz.
External Trigger is the setting that will allow the user to use an external source to have a valid trigger. There are two ways for the
MicroTrap™
VOD/Data Recorder
to receive an External Trigger.
• Make Circuit uses a loop of wire that is normally open circuit and triggers the
MicroTrap™
when the circuit closes.
• Break Circuit uses a loop of wire that is normally closed circuit and triggers the MicroTrap™ when the circuit opens.
For more details on the External Trigger feature, refer to Section 5.5.
To use External Trigger, ensure that the switch on the panel has been set to External prior to pressing the Start button.
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