Command line interface
•
filter
=
2
creates a filter with a corner at 20 % of the Nyquist frequency for
tap
tap
(
i.e.
15 % of its sample rate); and
•
filter
=
5
creates a filter with a corner at 50 % of the Nyquist frequency for
tap
tap
(
i.e.
25 % of its sample rate).
When
LOWLATENCY
is active, this command is used to set the tap used as the source
of low-latency data. Data from this tap are decimated inside the DSP and output on a
separate stream at a rate ten times slower than the configured rate.
6.8.10 MICROG
Syntax:
level
MICROG
Sets the output level above which a trigger will be declared when using the
LEVEL
triggering algorithm.
level
is measured in counts.
6.8.11 HIGHPASS
Syntax:
filter
HIGHPASS
Instructs the DM24 to pass the stream(s) which generate
LEVEL
triggers through a
high-pass filter before examining them.
filter
can be:
•
1
, for a 100 s high pass filter;
•
2
, for a 300 s filter;
•
3
, for a 1000 s filter; or
•
0
, to disable the high pass filter.
Note:
the main continuous outputs, both transmitted and recorded are
also affected by any filter specified using this command.
6.8.12 PRE-TRIG
Syntax:
time
PRE-TRIG
Sets the pre-trigger recording time, where
time
is the number of seconds of buffered
data to output from
before
a trigger is declared.
6.8.13 POST-TRIG
Syntax:
time
POST-TRIG
Sets the post-trigger recording time, where
time
is the number of seconds of data to
output after a trigger condition lapses. If an event persists for some time,
all
triggering components must fall below the threshold before the trigger condition will
lapse; only then will the post-trigger period begin.
75
Issue U - December, 2021
