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C
M
ARE AND
AINTENANCE
target precisely level with the Impulse scope. If you
do not have such an instrument, use one of the
additive offset methods, such as the "desktop"
additive offset, which is also the factory calibration
method, or the "opposed targets" additive offset
procedure, which is described after the desktop
method.
Computing the subtractive offset value requires this
procedure:
1. If necessary, realign the scope.
2. Make sure the instrument reads degrees and
percent slope is turned off.
3. Position the scope so its center is aligned with a
previously determined level target. Note: The
scope must be
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4. Take an inclination measurement and note
5. Return to the SYS - CAL option, and press
6. Edit in the value.
7. Return to the INC option and measure the
To compute the additive offset, follow this
procedure:
1. Make sure the instrument reads degrees and
2. Set your power conservation interval to 5
Electronic Copy of LTI's Impulse User's Manual 8
properly aligned for this calibration to be
accurate.
down the value.
Fire2 to enter the editor.
same target again. The inclination
measurement should be 0.00.
percent slope is turned off.
minutes/60 seconds or ALL On.
th
Edition © October 1998
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