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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
If you want 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. You can
program how many triggers to do before waiting for another arm condition.
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
HP E1432A User's Guide
The C-Language Host Interface Library
4-22