CT12A INSTRUCTION MANUAL
56-101-03100-E CH. 3
May
/ 29 / 09 Page 14 of 19
y If current settings are not appropriate, select desired Operation (standard or averaging)
and the temperature (°F or °C) modes, following the steps indicated in sections 3 and 4,
respectively, immediately after power on.
y Verify that the cable size and riser number indicated in the display, match with the risers
that have been selected. If they do not match, the following sequence will allow setting
internally the correct cable size. Press and hold the BKLITE
/ CABLE SEL button only
when the display toggles between the current internal setting of cable size and riser
number. Release the button when the display changes to the next (in the order of the
Label Table) cable size. The display will now toggle between this new cable size and
riser number. Repeat by pressing, holding and releasing this button until the desired ca-
ble size is displayed.
Note:
Just holding the BKLITE / CABLE SEL button down will simply stop the sequence;
it has to be alternatively pressed and released, according to the changes of the
display, in order to access the different sizes to make the selection.
y After these settings are completed, press and release the MEASURE / HOLD button and
move the lever. CT12A will show the ambient temperature, indicating that the set up is
complete, so the unit is ready to start taking measurements.
7. TAKING TENSION MEASUREMENTS
General Notes:
y The measuring procedure is common for single-riser and multi-riser units. However,
there is a difference at the moment of taking the reading, between the two measuring
modes (standard or averaging).
y As an option, the reading being taken can be held in display, as explained in section 8.
y Caution: When performing low tension measurements, where the handle does not lock
in position, make sure that the handle is fully closed. Failure to do so will result
in inaccurate measurements.
y Caution: For cable tension adjustment, carefully adjust the control cable tension in ac-
cordance with the airframe manufacturer’s recommendations.
On a large aircraft, take the temperature of the immediate area into considera-
tion when using the CT12A as with any standard cable tensiometer. For long
cable sections, use the average of two or three temperature readings to obtain
accurate tension values.
y Caution: The CT12A should not be used on cables that are connected to tension reg-
ulators,
since the actual tension in such cables will vary depending on the errors
in the regulator, its spring rate, and the condition of the control cable.
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