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Arm and Trigger
This section explains some terminology relating the the “Arm” and “Trigger”
steps in the measurement loop. As an example a measurement might be set up to
arm at a certain RPM level and then subsequently trigger at an external event
corresponding to top dead center (TDC). The settings would be:
q
Arm: RPM Step Arm
q
Trigger: External Trigger
To begin a throughput session at this same RPM/TDC event, then the first
external trigger after a specified RPM would start a continuous mode
measurement. Now (using overlap block mode) the settings would be:
q
Pre-Arm: RPM Step Arm
q
Arm: Auto
q
Trigger: Auto
In the measurement loop, an arm must take place before a trigger. The number
of triggers that occur before waiting for another arm condition can be
programmed. The default is one trigger for each arm. For each trigger, a
block of data is sent to the host.
The first arm in a measurement is the pre-arm. By default, the pre-arm condition
is the same as the regular arm conditions.
Valid Arm (and Pre-Arm) conditions are:
q
Auto Arm
q
Manual Arm
q
RPM Step Arm
Valid trigger conditions are:
q
Auto Trigger
q
Input Trigger
q
Source Trigger
q
External Trigger
q
Manual Trigger
q
Tachometer Edge Trigger
VT1433B User's Guide
Using the VT1433B
3-29