Humboldt 5000 BLU Light Weight Deflectometer - Manual (Page 41)

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After performing the third test, the device will show the settlements s4, s5 and
s6 in mm, as well as the respective settlement curves. Additionally, the final
result, the Evd value in MN/m
2 , will be shown and will also be announced,
rounded to whole numbers in MN/m 2 , via the voice output.
A longer audio signal (a beep lasting one second) and the voice output ‘TEST
FINISHED, PLACE WEIGHT BELOW’ announce the end of the test and the
recording of measured data on the internal memory and SD card (if in use).
All test data including settlement curves, GPS coordinates, date, time, serial
number, device type, and the test results themselves are now saved. The
protocol can be printed by pressing the ‘PRINT’ button. Alternatively, continue
with the next test by pressing the ‘START’ button (NEXT) again.
Keep the safety grip on top of the device tight in your hand during the whole
test. When a test is not being performed, never leave the weight latched on top
of the loading device, as it could fall over and cause injury or damage. The
drop weight should only be latched on top of the device immediately prior to
an upcoming test. While in use, only the operator should come close to the
device. All other persons should stay at a safe distance to ensure that no one
is injured by the dropping weight. After the sixth drop place the drop weight
in its ‘rest’ position on top of the bellows at the bottom of the device and lock
it immediately with the transportation lock.
Ensure that the guide rod is kept upright during the impact. Use the spirit level
integrated in the safety grip to aid in the vertical positioning of the guide rod.
The test is invalid if the load plate moves horizontally during the impact. This
risk exists particularly if the test area is inclined. Avoid sideward movements
of the load plate on inclined test areas by placing your foot right next to the
plate. Never stand on the plate! Doing so will distort the test results. Every
correct impact will be acknowledged by an audio signal (a single beep).
A different signal (a stuttering beep) will announce a possible measuring error.
In this event ‘Try again’ will be shown on the display and announced by the
voice output. Should this occur, move the load plate and restart the complete
test from the first pre-consolidation drop.
If the error message shows again, the soil may be too soft or too hard, so that the
measured value is outside the measuring range. In this case, move the Bluetooth
®
load plate to another testing point and repeat the test there.
The sensitivity of the testing computer is set up in such a way that a normal
placing of the loading device on the Bluetooth
® load plate, or a normal
latching of the drop weight into the release mechanism will not trigger a
measurement.
However, abrupt movements when placing the loading device on the
Bluetooth
® load plate, or latching the drop weight into the release
mechanism, may trigger an impulse. The electronic plausibility check will
recognise the error and the device will restart the complete test. Move the
load plate and start the test procedure again from the beginning.
If the settlement is very small, it is advisable to push the loading device onto
the metal ball of the sensor dome during impact. Doing so will help to avoid
a possible rebound of the guide rod and thus a distortion of the test results.
Try again !