4
5
Controls and Indicators
Refer to diagram: the handset has a LCD (liquid crystal) display, one colour coded
indicator LED (E), a beeper, and a keypad with 3 keys. The display is used for setting up
the instrument and displaying the measured tension. To avoid the user having to read the
display whilst adjusting the belt, the handset give an audible beep and the colour coded
LED gives visual indication of whether the tension is within or outside the limits that have
been preset by the user.
All 3 keys on the keypad have dual functions:
The POWER key (C) is used to switch the instrument on and off; during operation of the
instrument, it functions as a multifunctional key which acts as the SET key and ENTER key.
The ZERO key (B) switches the instrument from measuring mode to zero mode. It also
functions as a DOWN key to
decrease
a value in a set mode.
The UNIT key (D) switches between different measurement units (eg, Newtons / Pounds /
Kilograms). It also functions as a UP key to
increase
a value in a set mode.
In measuring mode, the colour coded LED and the beeper indicate if the measured tension
is below, within, or above the pre-set limits (Users can change the alarm limits AL1 or AL2
when required to give accurate low and high readings for a specific belt tension specification
- Please refer to following section:
How to set the low limit or the high limit
.
If the measured tension is low, the LED’s colour changes to that of LO (amber) and the
beeper will emit a
single beep
after each measurement.
If the tension is OK, the LED’s colour changes to that of OK (green) and the beeper will
not sound
.
If the tension is high, the LED’s colour changes to that of HI (red) and the beeper will emit
a
3-beep
sound after each measurement.
Setting and Tensioning a New Belt
Before using the instrument for the first time, remove the battery compartment cover, and
fit 4 AAA size 1.5V alkaline batteries. Pay attention to the battery polarity as indicated in
the battery compartment.
Plug the DIN connector of the Measuring Head into the DIN socket of the handset. Note:
the arrow on DIN connector must line up with the marked line on the handset DIN socket.
Do not force
the DIN connector.
Power on the instrument by pressing the POWER key (C), The tester will switch on in the
testing state it was last used in, with the lower and upper limits and unit measurement
range as set previously.
How to Set the Low Limit or the High Limit:
If required, after referring to the manufacturer’s belt tension specification, the lower and
upper limits need to be changed, press and
hold
the POWER key (
C
) until
AL1
or
AL2
appears on the display. This can take a few seconds.
AL1
displays the low limit and
AL2
the high limit. The tester is now in setting mode. The
value can be changed to the required setting by depressing the UP and DOWN keys to
increase or decrease.
To save and quit, just press the POWER again. If the error info
Err4
shows on the display
about 1 second, that indicates
AL1
is a higher value than
AL2
and requires resetting.
As an example, if the manufacturer’s recommendation is 385 Newtons, a typical low limit
setting would be 370 Newtons, and a typical high limit setting 400 Newtons.
Notes:
• To make the setting quicker, when the key is held down, the count will speed up
after about 4 seconds.
• The first time the instrument is used, the default high and low limits are 250 and 200
Newtons respectively.
• The maximum value to which the high limit can be set is the maximum value that the
unit will display in the currently selected units (see Specifications).
• The maximum value to which the low limit can be set is the high limit. The low limit
cannot be set higher than the high limit.
• If the measurement unit is changed, the previously stored limit is erased and
replaced with the maximum value for the selected unit.
Check the handset display reads zero, if not press the ZERO key.
Zeroing should be
done every ten minutes
. When zeroing, the measuring head should not be clamped
onto the belt, nor have any load applied to it. Ensure that the clamping knob is fully
unscrewed.
Tensioning a New Belt
Slide the clamping hook (L) of the Measuring Head (F) over the belt at the measurement
position indicated by the vehicle manufacturer, so that the edge of the belt touches the
two locating lugs (J). If no position is indicated, position the measuring head in the centre
of the longest free section of the belt. Refer to diagram: ensure that the clamping hook
rests in the low ‘trough’, between the teeth of the ribbed belt and not on top of one of the
teeth.
Turn the clamping knob (G) clockwise until the flat side of the belt contacts the anvil, and a
resistance is felt. This should only be finger-tight.
Do not over tighten
.
