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3 FUNCTIONAL AND OPERATING ELEMENTS
3.1 Cobra SMARTsense Force & Acceleration
3.1.1 Operating elements
The sensor has an on-button and two LEDs for indicating the
Bluetooth and battery charge status.
On-button
Press the on-button for more than 3 seconds to switch the
sensor on and off
Bluetooth-LED
Flashing red every 2 seconds
Not connected
Flashing green every 2 seconds
Connected to the ter-
minal device
Flashing green every 4 seconds
Running measurement
Battery charge LED
Flashing red every 2 seconds
Low battery
Illuminated red
Active charging process
Illuminated red
Charging process com-
pleted
3.1.2 Functional elements
The cantilever beam is located inside the housing. The sup-
plied hook for carrying the load can be screwed into the bot-
tom of the sensor and secured with the knurled nut.
3.1.3 USB port
The battery, which is permanently installed in the sensor, is
charged via the type C USB port.
Furthermore, communica-
tion with a computer takes place via this interface.
3.2 Assembly
Fig. 2
Fig. 3
3.2.1 Screw the two Cobra SMARTsense Force & Accelera-
tion sensors onto the base plates (6) and the carriage (8) us-
ing the knurled screws (1) as shown in Fig. 3.
3.2.2 Place the sensor mounted on the carriage (8) in the
elongated slide rail of the base plate (6).
3.3.3 Replace the hooks (7) with the connectors required for
the experiment. Magnets (3) or two threaded rods (2) with a
connecting nut (4) are available for this (see 5.1 Experiment
set-up).
Caution: Tighten the lock nuts on the hooks or
threaded rods only slightly by hand. Never use a
tool. This can lead to the destruction of the lock
nuts.
4 NOTES ON OPERATION
This device fulfils all of the technical requirements that are
compiled in current EC guidelines. The characteristics of this
product qualify it for the CE mark.
The individual connecting leads are each not to be longer
than 2 m.
The instrument can be so influenced by electrostatic charges
and other electromagnetic phenomena (HF, bursts, indirect
lightning discharges) that it no longer works within the given
specifications. Carry out the following measures to reduce or
eliminate the effect of such disturbance: Ensure potential
equalization at the PC (especially with Laptops). Use screen-
ing. Do not operate high frequency emitters (e.g. radio
equipment or mobile radiotelephones) in the immediate vicini-
ty. When a total failure of the instrument occurs, unplug it and
plug it back in again for a reset.
5 HANDLING
5.1 Experimental setup
Select the required connecting elements and screw them to
the two sensors.
When using magnets (3) of the same colour, they repel each
other. When using the threaded rods (3), ensure a secure
screw connection of the connecting nut (4).
Fig. 4 Set-up with homopolar magnets
Fig. 5 Set-up with magnets with opposite poles
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3
4
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