EXFO USER GUIDE User Manual page 71

Setting Trigger Acquisition Parameters
Conditional data acquisition can be performed using a triggered
acquisition, meaning that data recording begins when a specified
condition is met. Different trigger conditions are available, which are
explained in the following table, where A and/or B represent the channel
on which the condition is to be met, and x and/or y represent the desired
power level threshold.
A > x
A < x
A > x AND A < y Acquisition will start when measured power in
A or B < x
x < A or B < y
(multichannel
power meters
only)
A < B
(multichannel
power meters
only)
External trigger
High Speed Power Meter
Trigger
Acquisition will start when measured power is greater
than the specified x value.
Acquisition will start when measured power is lower
than the specified x value.
channel A is inside the interval set by the values
x and y.
Acquisition will start when power in either channel A
or channel B is lower than the specified x value.
Acquisition will start when measured power in
channel A goes over a specified value (A > x).
OR
Acquisition will start when measured power in
channel B falls under a specified value (B < y).
Acquisition will start when measured power of
channel A is lower than measured power of channel B.
Acquisition in single rate will be triggered by an
external signal, whether on positive or negative TTL
voltage transitions (SeeExternal Trigger on page 82 for
additional information on this feature).
Performing Acquisitions
Selecting the Acquisition Mode
Description
63