T
ARGETING
Page
40
Electronic Copy of LTI’s Impulse User’s Manual 8
th
Edition © October 1998
Listening to the Instrument
If the audio update feature is on, the Impulse will emit a variety of ticks and tones when it takes readings (see
“Turning the Beeper On and Off” under
The sounds vary depending on what
the instrument is doing, and you can tell what is happening during a measurement simply by listening. The
table below explains the various sounds.
Sound Meaning
Growl
(extremely fast ticking)
The instrument is trying to lock onto a target for a range measurement.
Nearly imperceptible when the instrument acquires the target immediately.
When the growling quits, the target is acquired and range readings are
being taken.
Double
high-pitched tone
The instrument has completed the measurement, and all sensors acquired
readings.
Single
high-pitched tone
The instrument has completed the measurement, but one or more of the
sensors failed to get a reading. The error message is indicated on the
display screen.
If you’re having trouble finding a target (you will know this by the growl you hear), you can hold the Fire button
down and pan the instrument around until it locates a target. The laser will try to acquire a target for up to 15
seconds, and if it is unsuccessful, it will time out and another trigger press will be needed to initiate a new
measurement.
When taking a measurement, be sure to keep the trigger pressed down and hold the instrument steady until
you hear the double-beep. Moving the instrument may cause inaccurate readings if the laser is shifted from
one target to another during a measurement.
