Wave User Manual
47
Version 4
8.4
Gate Advanced Settings
This section presents slightly more advanced features for the gates.
8.4.1
Gate Polarity
The
Gate Polarity
parameter may take the following values: absolute, positive or
negative. Here is a brief description of each:
●
Absolute
: Considers all signal for evaluation (available only with non-rectified
signal)
●
Positive
: Considers only the positive signal for evaluation (available with non-
rectified or rectified or positive only signal)
●
Negative
: Considers only the negative signal for evaluation (available only with
non-rectified or negative only signal)
8.4.2
Setting up an Adaptive Gate in Gate Mode
Gate 2
and
Gate 4
have an adaptive triggering feature. This feature adapts the gate with
respect to the start function (
Gx Start
) of
G1^
peak position. In the example below,
G1
Start
is set at 12 mm. The
G1^
sound path is 25.4 mm. The blanking value is the minimum
offset between
G1^
and
G2 Start
. In this case, the
G2 Blanking
is set to 15 mm. Hence,
the
G2 Start
will automatically be set to (12 mm + 25.4 mm +15 mm = 40.4 mm).
Figure 34
–
Adaptative gate
For a gate adaptive triggering set to
F-F,
it has the same described behaviour. However,
but the flank is the new source of position.
In echo to echo mode, this prevents
Gate 2
to trigger the same peak as
Gate 1.
Consequently, a
G2-G1
measurements would have been set to 0 mm.
