Checkline DTMX - Manual (Page 2)

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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 Capacity 100 values plus maximum, minimum, average, peak, standard deviation
and memory location
Memory Operation Continuous Mode: automatic storage of each displayed value until memory is full
On-Demand Mode: displayed value is stored when
STORE key is pressed
Overrange Indicator Value will blink on/off, then “FFFF”
Field Calibration Adjustment + 7 steps, 1.5% per step
Serial Output RS-232C (4800 baud, 8-bit word length, no parity, 2 stop bits)
Analog Output 0 –1 VDC, proportional to tension range
Frequency Response (Analog Output) 16 msec (62.5 Hz)
Battery Type Four (4) 1.5 V AA (included)
Battery Life 20 hours, continuous use
AC Adapter (optional) 6 V DC @ 300 mA, for continuous in-line use. Powered by 115 VAC
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, output connector and operating instruction guide, all in a fitted,
hard-plastic carrying case
Warranty One year
2
1.00 INTRODUCTION
The CHECK•LINE ® DTMX 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,
rigidities, gravity and other critical parameters. The DTMX is powered by four
AA batteries and is supplied in a rugged, die-cast aluminum housing.
The DTMX 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 data logging system is provided which permits storage of 100 indi-
vidual data points plus maximum, minimum, peak, average and standard devi-
ation values. The recorded data and statistics can be recalled to the display for
viewing, downloaded to the battery-powered P-40 Printer (or other serial print-
er) or downloaded to a Personal Computer. The DTMX can also be mounted
in-line for extended periods using the threaded mounting holes on the rear side
of the housing. For long term analysis, an AC adapter can be connected. The
DTMX can be connected to a Chart Recorder (or other recording device) using
its 0-1 VDC analog output. For those familiar with RS-232 communication, the
DTMX can also be "polled" from a Host Computer.