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HP VXI E1432A User Manual

Page 63

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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
Using the HP E1432A

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