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C
M
ARE AND
AINTENANCE
Go to SYS/BORE
Aim at the center of the
target and hold down the
Fire button.
Slowly pan the Impulse
horizontally and
vertically. When the tone
drops from high to low,
note the position of the
target relative to the
aiming dot or crosshair.
Unscrew and remove the turret caps.
Adjust elevation and
windage until the
frequency drops off
when the target is at
equal distances from the
center of the aiming dot
or crosshair.
Check the alignment one last time. Then replace the
turret caps and power down the instrument.
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"tt" is displayed.
The instrument emits a tone.
The frequency varies as you
move the instrument.
If the frequency drops off at
equal distances from the
center of the aiming dot or
crosshair, the instrument
needs no adjustment.
Otherwise, continue with the
next step.
Each tick mark on an
adjustment screw equals
one minute of angle (MOA).
Adjust carefully. Make sure
you're moving the dot or
crosshair in the right
direction before you try
adjusting in large
increments.
Electronic Copy of LTI's Impulse User's Manual 8
Aligning the Tilt Sensor on the Impulse
200
Periodically check, and realign if necessary, the
instrument's tilt sensor using the CAL suboption in
the SYS menu. The process of "aligning" the
sensor involves finding out how far off it is, and
recording an offset value that accounts for the
discrepancy. The basic idea behind the procedure
is simple: you are aligning a target level with the
scope and forcing the instrument to measure an
inclination angle of zero.
Different methods of tilt calibration offer varying
degrees of precision, and you can determine which
to use based on the level of accuracy required for
your measurements. The first method, the
subtractive offset, requires a precision surveying
level that helps you position a
th
Edition © October 1998
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