HP 8-Channel User Manual download pdf (Page 99)

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

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HP 8-Channel User Manual Page 99