PHYWE Cobra SMARTexperiment Manuel utilisateur

Operating

instructions

Cobra SMARTexperiment - Hooke's Law

12970-00

PHYWE Systeme GmbH & Co. KG

Robert-Bosch-Breite 10

D–37079 Göttingen

Telefon +49 (0) 551 604–0

Fax +49 (0) 551 604–107

E-mail [email protected]

Internet www.phywe.com

The unit complies

with the applicable

EC-guidelines

Fig. 1: 12970-00 Cobra SMARTexperiment –Hooke’s Law

TABLE OF CONTENTS

1SAFETY PRECAUTIONS

2PURPOSE AND CHARACTERISTICS

3FUNCTIONAL AND OPERATING ELEMENTS

4NOTES ON OPERATION

5 HANDLING

6TECHNICAL DATA

7SCOPE OF DELIVERY

8ACCESSORIES

9 CONFORMITY

10 DISPOSAL

1 SAFETY PRECAUTIONS

Carefully read these operating instructions completely

before operating this instrument. This is necessary to

avoid damage to it, as well as for user-safety.

Use the unit only for its intended purpose

Only use the instrument for the purpose for which it was

designed.

Do not open the unit.

Protect the instrument from dust, moisture and vapours.

Use a slightly moist lint-free cloth to clean the instrument.

Do not use aggressive cleaning agents or solvents.

2 PURPOSE AND CHARACTERISTICS

With the SMART experiment "Hooke's law", Hooke's law -

elastic deformation is proportional to the applied load - can

be illustrated with a simple set-up.

Caution!

3 FUNCTIONAL AND OPERATING ELEMENTS

3.1 Cobra SMARTsense Sensors

Fig. 2 Cobra SMARTsense sensors

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

completed

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. 3

3.2.1 Screw the rod (1) into the base plate (3) and secure the

rod against turning using the plastic wing nut (4).

Fig. 4 Mounted rod on the base plate

3.2.2 Screw the rod (2) into the bar (1) for extension.

Fig. 5 Rod extension

3.2.3 Attach the Cobra SMARTsense Force & Acceleration

Sensor to the bracket provided (5). Use the knurled screw to

fix the sensor.

Fig. 6 Mounted sensor

3.2.4 Clip the sensor holder to the top of the pole and press

the Cobra SMARTsense Motion Sensor into the holder.

Fig. 6+7 Mounting the motion sensor

3.2.5 Align the sensor head of the Motion Sensor with the

centre of the reflection plate.

Fig. 8 Alignment of the motion sensor

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

5.1.1 Five springs of different lengths are available for the

test. The springs have a ring eyelet at the bottom.

Fig. 9 Springs

5.1.2 Hang the spring into the eyelet of the Force & Accelera-

tion Sensor and onto the constriction between the scale dis-

play and the reflection plate (Fig. 11[1]) . The knurled screw

(Fig. 11 [2]) can be tightened to fix the respective height.

Fig. 11 Spring and height adjustment

Fig. 12 Ready-assembled experimental set-up

5.1 Charging the Force & Acceleration Sensor

Use a USB-C cable to connect the sensor to a computer or

USB charger (not included).

During the charging process, the battery charge LED lights

up red. When the charging process is complete, the battery

charge LED lights up green. The charging time for a com-

pletely discharged battery is 3 hours maximum.

Disconnect the charger at the latest four hours af-

ter the completion of the charging process. Other-

wise, the service life of the battery may be nega-

tively affected.

5.2 Start-up

Switch on the sensor by pressing the power button for more

than 3s. Now the Bluetooth LED flashes red. Start the soft-

ware and select the sensor.

If the sensor is to be used via the USB interface, it does not

need to be switched on. The sensor is connected directly to

the end device using the supplied USB cable.

There is a 9-digit code

on the back of the sen-

sor (Fig.13). The last 4

digits of the code are

displayed as the sensor

name in the software

(Fig.14). This enables

the precise assignment

of the sensors within

the software.

Fig. 13

Fig. 14

Selection of the sensor via the Bluetooth interface

Make sure that the Bluetooth interface is activated on the

terminal device (PC/Tablet/Smartphone) and that the soft-

ware is allowed to access the interface.

After the sensor has been selected in the software, the LED

flashes green to indicate that the connection has been estab-

lished correctly. After the sensor has been coupled with the

software, the sensor is no longer visible to other users in the

software, and therefore can no longer be selected.

If the sensor is switched on and not connected, it switches off

automatically after 5 minutes.

Selection of the sensor via the USB interface

For this purpose the sensor must be plugged into the USB

port of the end device. It is not necessary to switch on the

sensor. The sensor is automatically recognized and dis-

played. It can be selected and connected directly.

6 TECHNICAL DATA

Operating temperature range: 5 - 40°C

Rel. humidity < 80%

Force & Acceleration Sensor:

Strength:

Measuring range

Resolution

Acceleration:

Measuring range

Resolution

Gyroscope:

Measuring range

Resolution

Accuracy*

±50 N

30 mN

± 16 g

0,01 g

34.9 rad/s

0.01 rad/s

± 1 %

Motion Sensor:

Measuring range

Resolution

Accuracy

0,2…2 m

1 mm

± 1cm / 2 %

Max. Sensor data rate

Sensor battery capacity

Max. Radio range (free field)

50 Hz

250 mAh

30 m

Dimensions (LxWxH)

Mass

150x200x500 mm

2,15 kg

*related to the measuring range end value

7 SCOPE OF DELIVERY

The scope of delivery includes:

1x Cobra SMARTsense Force & Acceleration 12943-00

1x Cobra SMARTsense Motion 12908-01

2x USB connection cable type C 07935-00

1x Holder for Cobra SMARTsense 12960-00

Set of springs

1x back plate with scale. mounted rod and shifting device

1x extension bar

8 ACCESSORIES

The following accessories are available:

USB-charger 07934-99

USB connecting cable type C 07935-00

USB-Bluetooth-Adapter 07936-00

Software measureLAB 14580-61

Free measureApp available from supplier portals

iOS

Android

Windows

9 CONFORMITY

10 DISPOSAL

The packaging mainly consists of environmentally-friendly

materials that should be returned to the local recycling sta-

tions.

PHYWE Systeme GmbH & Co. KG

Abteilung Kundendienst

Robert-Bosch-Breite 10

D–37079 Göttingen

Telefon +49 (0) 551 604-274

Fax +49 (0) 551 604-246

Do not dispose of this product with normal

household waste. If this unit needs to be

disposed of, please return it to the address

that is stated below for proper disposal

PHYWE Systeme GmbH & Co.KG hereby

declares that the radio system type 12970-

00 complies with the 2014/53/EU directive.

The complete text of the EC Declaration of

Conformity is available at the following In-

ternet address:

www.phywe.com/en/ec-declaration

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