HP E1433A, User Manual, Page: 66 / 222

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 E1433A User's Guide
Using the HP E1433A
3-27
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