2
1.00 INTRODUCTION
The CHECK•LINE
®
DTMB Digital Tension Meter is a hand-held device which
accurately measures the running as well as static tensions of a wide variety of
process materials including yarns, fibers, wires, optical fibers, etc. It employs
the "three-roller principle" of tension measurement where the outer two refer-
ence rollers are fixed to create a known angle of wrap over the middle sensing
roller. The middle roller is part of a precision strain gauge sensing system
which accurately measures the resulting force on the roller. This value is con-
verted into a highly accurate and repeatable tension value using proprietary
computer calibration formulas which correct for different material diameters,
gravity and other critical parameters. The DTMB is powered by four AA batter-
ies and is supplied in a rugged, die-cast aluminum housing.
The DTMB takes 62 tension measurements per second and displays the aver-
age of these measurements over a user-selected interval of 0.5, 1, 2 or 4 sec-
onds, the Display Update Rate. This permits the user to determine the extent
of averaging (or damping) required to "stabilize" the tension readings, making
them much easier to read and eliminating the undesirable "bouncing needle"
condition found on most mechanical tension meters. To set or change the
Display Update Rate, refer to Configuring Dip Switch Settings, Section 5.30.
A built-in memory system is provided which permits storage of the
maximum,
minimum
and
peak
values occurring during a measuring interval. These values
can be recalled to the display for viewing.
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Specifications
Measuring Principle
Strain gauge
Measuring Frequency
16 msec (62.5 samples/sec)
Deflection of Sensing Roller (max.)
0.2 mm
Overload Capacity
200% of Full Scale
Temperature Coefficient
Zero: less than + 0.3% FS/ °C Span: less than + 0.01% FS / °C
Display
4-Digit LCD, 12 mm high
Display Update Rate
0.5, 1.0, 2.0 or 4.0 seconds, dip-switch selectable
Memory System
Last, maximum, minimum and peak values
Overrange Indicator
Value will blink on/off, then “FFFF”
Field Calibration Adjustment
+ 7 steps, 1.5% per step
Battery Type
Four (4) 1.5 V AA (included)
Battery Life
20 hours, continuous use
Auto Power Off
After 2 minutes of non-use
Roller Material
(standard)
Hard-coated Aluminum
..
.
(optional)
Hardened Steel (ST), Ceramic (CE), Plastic (PL)
Maximum Speed
(standard)
2000 m / min
...
.
(optional) 5000
m / min
Housing
Die-cast Aluminum
Dimensions
2.95" W x 10.83" H x 1.77" D
(75 x 275 x 45 mm)
Weight
(approximate)
1.43 lbs.
(650 g)
Operating Temperature
32 to 132 °F
(0 to 45 °C)
Accessories Included
4 AA batteries and operating instruction guide, all in a fitted,
hard-plastic carrying case
Warranty
One year
