3
4
2. Brief summary, caution & check points for failure
3. Measurement principle of BDTM201
The sonic belt tension meter
(
BDTM201
)
is the
handy equipment which enables to measure
the tension accurately by analyzing sonic wave
without touching.
A sensor catches the produced
eruption of sound wave by pick the belt span.
After that, the high processing computer
analyzes it and shows the result on the screen
digitally.
When we make an impact on a belt between
pulleys, it starts to oscillate irregularly. The
belt gradually oscillates with its inherent
regular waveform, but this basic waveform
will be attenuated in a short while. Though
we did not have any simple devices for
picking up a period of such a waveform, we
can now do so fairly easily thanks to the
development of unique data processing
methods. A measured oscillation frequency
can be converted into a belt tension with the
formula on the right.
Thus, BDTM201 can display a more accurate
tension by incorporating a correction factor
obtained in calibration testing into data to be
input, though it may display a higher tension
than in actuality due to the rigidity of the belt
under specific conditions.
Calculation“To
＝
4×M×W×S
2
×f
2
×10
-9
”
To
：
Tension
M
：
Unit mass
W
：
Belt width or number of ribs
（
wires
）
S
：
Measured span length
f
：
Horizontal characteristic frequenc
（
N
）
（
g/mm width × m length
）
（
mm/R
）
（
mm
）
（
Hz
）
■
Brief summary
■
Check points for the immeasurable state
［
Failed to measure or the results were fluctuated significantly.
］
ITEM
＊
Please inquire to us or the dealer where you purchased if the BDTM201 does not work after checking
the points above.
PRESUMED
PRESUMED CAUSE
CONFIRMATION PONT
"Error" shows up or
the measure mode
can not be engaged
or the red light on.
The unevenness of
the output level is
large.
●
The measured
value changes
every time greatly
●
The sensor
responds to the
background noise
keenly
●
"0" is entered to the unit mass,
width & span
●
Input the wrong frequency range
●
Measured frequency exceeds
5000Hz or below 10Hz
●
Battery drain
●
The sensor attaches to a belt for
a moment
●
Automatic gain adjustment is not
enough
●
Check the entered data
（
Input
the correct number
）
●
The frequency displays, but the
tension does not measure
●
Change the measurement
frequency range
（
LOW
（
V
）
⇔
STANDARD
⇔
HIGH
）
●
Check whether the measurement
frequency exceeds 5000Hz or
not
●
Battery drain
●
Measure again keeping enough
distance so that the sensor does
not attach to a belt
●
Turn off a power once at the
measurement place, then turn it on
（
Turn on a power with
connected the sensor, then push
"MEASURE" button after one
second
）
Nothing shows up or
only measuring
processing sign
shows up from the
third time of
measurin
（
Frequency mode
）
