– 6 –
7.0
O
VERVIEW OF
O
PERATING
M
ODES
The WTT-110 can be set to operate in one of two distinct operating modes: Peak
Capture or Average. In Peak Capture Mode, the system measures the force at a fre-
quency of 1000 Hz (1000 times per second) and displays the highest force measure-
ment. The peak value remains on the display until a higher force value is measured or
until the user presses the ZERO key.
In Average Measurement Mode, the system measures the force at a frequency of
1000 Hz (1000 times per second) and displays the average each time the display is
updated. The factory default display update rate is 3 times per second (1 time every
1/3 second).
Note:
Refer to Advanced Setting, section 10, page 10, for additional information and
to change the update rate.
8.0
C
HANGING
U
NITS OF
M
EASUREMENT
The WTT-110 can display force measurements in any of the following theree engineer-
ing units:
■
lbf (pounds)
■
N (Newtons)
■
Kgf (kilograms)
To change the selected engineering units for display press UNITS key. Each time the
key is pressed, the units will change from one to the other as follows:
Lbf
Kgf
N
– 15 –
12.0 C
ALIBRATION
The WTT-110 Pull Tester has been calibrated in accordance with factory proceedures
and is certified to perform within the stated accuracy specifications shown in the
Specifications section found on page 18. Assuming the unit is handled with care
and operated as detailed in this manual it should remain accurate for an extended
time period. If however, it is subjected to forces that exceed its maximum range or
if it is not properly cared for, it might need to be recalibrated.
It is recommended that the calibration is verified at least on an annual basis and more
frequently if feasible. Normally, instruments of this type go out of tolerance from one
day to the next and rarely on a regular periodic basis.
A calibration procedure is provided in this manual, however it should only be per-
formed by individuals properly trained for this type of service and with the appropriate
certified standards (known weights or secondary force measuring system such as a
load cell, etc.).
Re-Calibration Set-up
1. Remove the lever by unscrewing it in a
counter-clockwise direction and move
the Wire Clamp assembly out from the
path of the hanging sample.
2. Position the WTT-110 in a vertical
position so that the keypad & display
are at the top (refer to photo). Be sure
to secure it so it can not topple over
when the weight is attached.
3. Using a heavy-duty monofilament
(fishing line), wire or similar, suspend
a 50 Kg weight from one of the teeth
on the wire terminal fixture by hooking
a loop of the material over the selected
tooth.
4. Temporarily, remove the weight and
follow the Re-Calibration Procedures
shown on page 16.
■
Make sure that the
WTT-110 is well secured
in the vertical position.
Caution
■
Select a material that is strong
enough to support 50 Kg of weight.