Checkline CTM - Manual (Page 2)

Specifi cations
2 AA, common alkaline batteries. Operational battery life over 40 hours at
room temperature. Battery life is reduced at lower temperatures.
Dot graphic LCD display
Power, Wire, Escape/Clear (Esc), Next ( ) and four softkeys with chang-
ing fuction and label, depending on the specifi c menu in use
Unit of measure, battery level
Temperature accuracy approximately ±2° F (±1°C)
2,000 lbf/ 1,000 kgf/ 10,000 N CTM instrument:
Displayed resolution setting
Low Med High
lbf (pound-force) 10 lbf 5 lbf 2 lbf
kgf (kilogram-force) 5 kgf 2 kgf 1 kgf
N (Newton) 50 N 20 N 10 N
Custom units between 101 &
200 divisions
between 201 &
500 divisions
between 501 &
1000 divisions
8,000 lbf/ 3,500 kgf/ 35,000 N CTM instrument:
Displayed resolution setting
Low Med High
lbf (pound-force) 50 lbf 20 lbf 10 lbf
kgf (kilogram-force) 20 kgf 10 kgf 5 kgf
N (Newton) 200 N 100 N 50 N
Custom units between 101 &
200 divisions
between 201 &
500 divisions
between 501 &
1000 divisions
For ease of use, the display always counts by a multiple of 1, 2 or 5.
Varied wire sizes
Suitable for outdoor use
10˝ x 23˝ x 3˝ (25 cm x 59 cm x 8 cm) approximately
11 lb (5 kg) approximately
Power
Display
Operational keys
Operational annunciators
Available options
Operating environment
Dimensions
Weight
Temperature detection
Display resolution
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5.0 Achieving Best Accuracy
The CTM is an instrument designed to give accuracy that typically exceeds
normal requirements for wire tensioning. You should have an understanding
of what factors affect tension measurement accuracy.
While it is best to have the instrument calibrated to the specifi c wire size(s)
and type(s) used, the CTM can often work adequately in other situations. If
the best tension accuracy is required, it is recommended that a calibration
be performed for that specifi c wire size and type.
What calibration choice and sheaves should I use?
Situation
Wire calibration
selection
Sheave
selection
Accuracy
Exact wire size
and type is
shown in wire list
Description of
exact match
Sheaves noted
in list
Best
Wire size is
same, but type is
not identical
Description of
same wire
diameter
Sheaves noted
for that wire size
Good
Wire size is not
the same
Closest diameter
Sheaves match-
ing the wire size
being measured
Fair
Do not use the CTM to measure tension for wires if both of the following are
true:
1. No wire calibrations are stored of the same diameter as the wire you are
looking to measure, and
2. You do not have sheaves of the same diameter.
If both of these conditions exist, contact your distributor.
Contact your distributor to improve accuracy for a specifi c wire type by
calibrating to it.
A tensiometer works by defl ecting the cable, which makes the cable path
longer than when a tensiometer is not installed. When the tensiometer is
removed, the wire tension decreases as the cable length is restored. This
effect is known as loading error. The CTM design elongates the cable by a
mere 0.08 inch (2 mm), making loading errors extremely small.
The CTM’s sheave with bearing design provides the best mechanical
performance. It is also superior at detecting tension that is being added or
removed.
5.1 Accuracy
5.2 Calibration to
Specifi c Wire Type
5.3 Loading Error
5.4 Non-repeatability
Contact your distributor for any
additional calibrations you may
need.
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