EN Cobra4: PHYWE's wireless measuring system

excellence in science

Experimentation without limits in science classes

Our wireless measuring system

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FeaturesFeatures

■ No disturbing cables

■ New didactical opportunities

■ Suitable for interdisciplinary

applications

■ Simple and safe in operation

■ Modular design

■ Ideal for students and demonstra-

tion experiments

Cobra4wireless


Cobra4 New ways of capturing measurement data

Natural sciences in context

Another example: If you combine the system with

a small laptop (netbook), you can perform field

experiments concerning, for example, forces and

accelerations, or examine the pulse and physiol-

ogy during physical education classes. One of

the students rides a bike, skates in a halfpipe, or

runs, and the other students observe the varia-

tion of the measurand in real-time on the moni-

tor of the netbook. The interrelations become

clearer thanks to the connection between the

measurands and the observed state. As a result,

the natural sciences can be experienced live and

better comprehended.

Another advantage is that groups of students can

independently acquire knowledge of the interre-

lations and then present their findings live with

a beamer, which is a method that fosters several

core competences at a time.

Mobile experiments

Cobra4 still has even more to offer, however.

With the Cobra4 mobile hand-held measuring

instrument, you can experience exciting project

days with your students and later evaluate your

experiments with our software measure. The

hand-held measuring instrument is also suitable

for demonstration experiments without a PC. The

measurement data can be transmitted to one or

several digital large-scale displays with the aid

of a radio adapter. This gives you the freedom to

perform demonstration experiments in the mid-

dle of the classroom together with your students.

The sensors, which are suitable for all of the basic

units, cover entire subject areas, such as thermo-

dynamics, weather, or electricity.

Intuitive and easy operation

Just like all the other computer-assisted experi-

ments by PHYWE, Cobra4 is also integrated into

our proven high-performance evaluation soft-

ware measure. For the measurement software for

Cobra4, we paid particular attention to intuitive

operation. The sensors are automatically identi-

fied by the system and then you can immediately

start with the measurements. The functionality of

the software includes all of the relevant elements

for the comfortable and trouble-free execution

of the experiments. You can start measure at any

time simply by pressing a button.

Ready-prepared experiments with reference to our everyday lives

Apart from numerous ready-prepared demon-

stration and student experiments in physics,

chemistry, and biology, the category of everyday-

life phenomena allows you to reach your students

where their knowledge of scientific relations can

be combined with practical applications.

Cobra4 offers you extensive comfort, flexibility,

and completely new experiment opportunities.

Computer-assisted measurements and evalua-

tions are becoming increasingly easy. Science ex-

periments can now once more come to the fore.

Measuring the height of towers

Measurement of everyday-life phenomena: floating and sinking?

Do you wonder how you could possibly raise

your students’ interest in the natural sciences in

this highly technical world? With Cobra4, PHYWE

offers you the solution to this question. Our wire-

less measurement data recording system Cobra4

opens up completely new, unprecedented didac-

tic ways of conveying scientific interrelations in a

convincing and inspiring way.

An Example: Up to now, computer-assisted

demonstration experiments have always been

bound to the location of the teacher’s computer,

which is usually fixed and rather far away from

the students. As a result, it was not always easy

to integrate students into the experiments. Now,

with Cobra4, the location of the computer is not

important any longer. Since the system is com-

pletely wireless, you can perform the experiments

in the middle of the classroom together with your

students. As a result, the students are perfectly

integrated into the teaching and learning proc-

ess, in which they can experience the natural

sciences in close quarters. In addition, completely

new subject areas can be treated. For example,

the students can directly measure certain quanti-

ties in reference systems that are in motion.

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Precise, wireless measurements – with our Cobra4 measurement system

■ Current consumption: < 100 mA

■ Supply voltage (USB-powered device): 5 V

■ Output power, radio: 1 mW

■ Data rate (burst): 40,000 values/s

■ Range, without obstacles: 20 m

■ Maximum number of Cobra4 Wireless-Links on the network: 99

■ Dimensions L x W x H: 75 x 25 x 10 mm

■ Weight 20 g


USB device for radio-based communication with Cobra4 devices, Wireless-Link, and Remote-Link. Technical data:

■ Power supply: 2 x Mignon/(AA) storage batteries


■ Output power, radio: 1 mW

■ Data rate, burst: 40,000 values/s

■ Range, without obstacles: 20 m


■ Weight: 200 g

■ Comes with 2 Mignon/storage batteries, 2700 mAh


Interface module for the radio-based transmission of sensor values. Technical data:

Cobra4 Remote-Link Ref. no. 12602.00

“Remote control” of Cobra4

■ Starting and stopping of a measurement series

regardless of the location of the PC

■ Measurement of single values regardless of the

location of the PC

Cobra4 Wireless-Link Ref. no. 12601.00

■ Automatic identification and assignment by the

Cobra4 Wireless Manager

■ Can be connected to all of the Cobra4

Sensor-Units

■ Automatic sensor identification of all of the

Sensor-Units

How can you obtain reliable measurement results

with minimum effort and in next to no time?

With the Cobra4 products by PHYWE. Thanks to

the imaginative and perfected technology, we

guarantee the quality and flexibility that you

need for you science classes.

Benefit from many, many advantages:

■ New didactic opportunities: you take the

experiments to your students

■ Trouble-free measurement of moving objects

(e.g. linear motion, rotation, acceleration,

pendulums, etc.)

■ Trouble-free measurement in closed systems

(e.g. propagation of pressure in a plastic bag,

temperature in a closed refrigerator, etc.)

■ More comfort: no disturbing cables that limit

your mobility

■ Higher safety: the PC can be located far away

from the experiment and is, thereby, protected

against damage through hazardous substances,

e.g. in chemistry classes

■ Configuration of a parallel wireless measure-

ment station at the push of a button

Cobra4 Wireless Manager Ref. no. 12600.00

■ Up to 99 Cobra4 Wireless devices can be

connected in a network

■ Easy, quick, and safe connection thanks to a

unique radio protocol that cannot be disturbed

by any other devices

■ Automatic management of the sensor data

together with the measure Cobra4 software

Cobra4 Wireless Manager

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Hand-held measuring instrument used as a data logger

Optimal for:

■ Field experiments with groups of students

during project days, excursions, etc.

■ Student experiments without a PC

■ Demonstration experiments without a PC

(with Display-Connect and a digital

large-scale display)

Direct connection to a PC with a USB cable

Optimal for:

■ Demonstration and student experiments

■ Particularly quick measurements (acoustics,

electricity, etc.)

Cobra4 USB-Link Ref. no. 12610.00

■ Up to 400,000 measured values per second

■ Can be combined with other USB-Links and

Wireless-Links/Wireless-Managers/Remote-Links

■ Automatic identification of all the Cobra4

Sensor-Units

■ Power supply via the USB connection

Cobra4 USB-Link – for particularly quick measurements

Ohm’s law with the Cobra4 USB-Link

■ Power supply: via the PC


■ Data rate (burst): 400,000 values/s


■ Weight: 100 g

Comes with a DVD with experiment descriptions, the evaluation software

measure Cobra4, all the necessary device drivers, a USB cable, and opera-

ting instructions.

■ Power supply: via the PC

The Cobra4 USB-Link is an interface module for the transmission of sensor values to a PC via a USB connection. Technical data:

Cobra4 Mobile-Link – our mobile hand-held measuring instrument for numerous measurands

Cobra4 Mobile-Link Ref. no. 12620.55

■ Up to 1,000 measured values per second.

■ Data can be stored on an SD memory card and

are, thereby, individually identifiable

■ Automatic identification of all the Cobra4

Sensor-Units

■ Protected against splash water, safe outdoor

experimentation

■ Easy, intuitive operation

■ The evaluation software measure can be used

FREE of charge

Device for the mobile measurement and storage of the measurement values on an SD memory card. With a USB interface for the data transfer to a PC after the measurement. Technical data:



■ Data storage: SD card, 2 GB max.

■ Data rate: 1,000 values/s


■ Weight: 200 g

Comes with 2 Mignon storage batteries (2700 mAh), an SD memory card

(2 GB), operating instructions, and the evaluation software measure (DVD).

Quality of various water samples based on their conductivity.

Voltage and current measurement (student experiment).

Safe connection to the sensor thanks to snap-in locks and a 15-pin Sub-D connector.

Like a digital camera: modern SD card for storing the measure-ment values.

large-scale display)

Cobra4 Display-Connect with a digital large-scale display for wireless data transfer.

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Our measure Cobra4 software: Modern, intuitive, and easy to use

Measurement window All of the measured values are immediately dis-

played. The following views can be selected for

every measuring channel:

■ Digital measurement window

■ Analog measurement window

■ Graphs

■ Additional measurement graphs that can

be scaled as desired

■ Double-click or right-click to open the setting

windows

Changes can also be made during a measure-

ment. Up to 1,000,000 data points can

be recorded per measurement series.

measure main program You can switch between the measurement window with your

measurements and the measure main program for the data

evaluation at all times. This means that you can measure

and simultaneously work on the data of another measure-

ment. There are numerous options:

■ Optimisation of the graphical representation of the

measurement data

■ Saving or printing of the measurement data

■ Evaluation tools: peak analysis, integral, extremes,

Fourier analysis, curve fitting, equivalence point,

linear regression, etc.

■ Conversion of the measurement values, such as sine,

square, root, logarithms, etc.

■ Combination of two measurement curves, e.g. U*I in

order to calculate the power

■ Export or import of data via the clipboard into/from

other programs, such as Excel, Word, etc.

■ Function generator

Loading experiments Numerous experiment examples can be loaded particularly

easily. Along with an extensive experiment description

in PDF format with a set-up illustration, material list,

experiment procedure and results, the system also auto-

matically loads all the necessary parameters.

They include:

■ sensor settings

■ representations

■ multigraph/virtual device

In addition, example measurements can be loaded into

the measure main program.

Keywords in the experiment examples In addition to the experiment examples, the relevant

keywords are also displayed. Click a keyword to call up

the help text with detailed explanations. As a result,

the experiments can be performed easily, quickly, and

safely.

Table/General Configuration Apart from the tab Devices, the navigator also has two

other tabs.

Table: Click this tab to see a table with the current measure-

ment values during the measurement.

General Configuration: On this tab, you can define the

measuring frequency, method for starting and stopping

measurements, as well as other settings concerning the

execution of a measurement.

Navigator Everything at a glance. The navigator allows you to:

■ view all of the connected sensors

■ view the state of the sensors (active, inactive)

■ change the sensor parameters by double-clicking

■ add calculated channels (virtual device) that can be used,

for example, for the online conversion of measured values

(e.g. °C into K) or the combination of the measured values

of different measuring channels (e.g. calculation and

representation of the resistance based on the current

and voltage)

The FREE measure Cobra4 DVD-ROM

includes all of the experiment descrip-

tions, configuration files, and example

measurements.

Software measure Cobra4

Single-user and school licence

Ref. no. 14550.61

System requirements:

PC with Pentium 3 or higher, 512 MB RAM, 1 GB

of free storage space on the hard disk, DVD drive,

USB 2.0, Microsoft® Windows XP or higher.

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Demonstration experiments

Unprecedented opportunities can be realised

with the wireless PC-assisted variant of Cobra4.

Think of fixed teacher PCs. Surely you have been

annoyed sometimes that your PC is located so

far away from your students, thus limiting the

opportunities for computer-assisted experiments.

With Cobra4 Wireless, everything is different:

There are no disturbing cables so that you can

move freely in the classroom and set up the

experiment right among your students. As a

result, the students are integrated better into the

teaching and learning process and can experience

and comprehend the natural sciences as closely

as possible. In addition, completely new subject

areas, such as, for example, moving reference

systems (e.g. weightlessness during a parabolic

flight) can be directly measured.

Fusion of demonstration and student experiments

The student performs an experiment and the

measurement will be transferred to your PC by

radio. At the same time, the measurement curve

will be projected with the aid of a beamer. On

the PC, you can then work on the results together

with your class and with the evaluation program

measure. Alternatively, the students can evaluate

the experiment at home with the free measure

software. Measurements, where it is not a meas-

urement curve that matters but a manageable

number of individual values, do not require a PC

at all. The students can perform the measurement

(e.g. samples that they brought to the class) one

after the other with the Mobile-Link and transmit

their results to the large-scale digital display with

the aid of the Display-Connect unit. The results are

then visible for everyone.

Student experiments

Many schools already use the TESS student

experiment system. A large number of student

experiments for Cobra4 that use TESS are already

Completely new opportunities – for student and demonstration experiments

documented in student worksheets and teacher

sheets - either in the Cobra4 handbook or directly

in the menu of the Cobra4 software. The high

level of user-friendliness of Cobra4 with the au-

tomatic sensor identification function facilitates

the independent computer-assisted execution

of experiments. In addition, the Cobra4 Mobile-

Link is ideally suitable for field experiments with

groups of students.

Cobra4 HandbookRef. no. 01330.02

Conceptional descriptions of demonstration

and student experiments in the fields of phys-

ics, chemistry, and biology. Special emphasis is

placed on the advantages of the wireless trans-

mission of measurement data with the Cobra4

system. Included for the first time are interdisci-

plinary experiments concerning the phenomena

of our everyday lives.

Content:

■ Phenomena of our everyday lives: household,

outdoors, hobbies, technology, and traffic

■ Physics: mechanics, thermodynamics, and

electricity

■ Chemistry: electrochemistry

■ Biology: ecology

■ TESS: mechanics, heat, and electricity/

electronics

Use of Cobra4 in combination with the demonst-ration system “Natural sciences on the board”

Cobra4 Display-Connect with a digital large-scale display for wireless data transfer

Field measurement with the Cobra4 Mobile-Link

Use of Cobra4 in combination with the TESS student experimentsUse of Cobra4 in combination with the TESS student experiments

opportunities for computer-assisted experiments.

With

There are no disturbing cables so that you can

move freely in the classroom and set up the

experiment right among your students. As a

result, the students are integrated better into the

teaching and learning process and can experience

and comprehend the natural sciences as closely

as possible. In addition, completely new subject

areas, such as, for example, moving reference

systems (e.g. weightlessness during a parabolic

flight) can be directly measured.

Handbook Cobra4: physics, chemistry, biology, everyday-life phenomena.

Computer-assisted experiments with Cobra4

Conceptional descriptions of demonstration

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The relation between the electrical voltage and the resulting current is measured with various test resistors. The quotient of the voltage and current is a constant value that characterises the component. The various measurement curves can be displayed in a particularly clear manner in a graph.

Experiment examples – physics

Quantity Name Ref. no.

1 Cobra4 Wireless Manager 12600.00

1 Cobra4 Wireless-Link 12601.00

1 Cobra4 Sensor-Unit “Electricity” 12644.00

1 Software “measure” for Cobra4 14550.61

Also required: cables, other components, small parts, and a PC


Excerpt from the equipment list






Also required: cables, other components, small parts and a PC



Ohm’s law P1330360

An alternating voltage is induced in a coil in the (alternating) field of a magnet that moves pe-riodically. The characteristic of a diode, i.e. the fact that it lets the electrical current pass only in one direction is used to rectify the induced alternating voltage. A capacitor that is connected in parallel to the consumer (resistor) smoothes the rectified alternating voltage.






1 Cobra4 Sensor-Unit “Temperature, semiconductor –20...+110°C” 12640.00

1 Student calorimeter 04404.88


Also required: power supply unit, calorimeter, cables, small parts, and a PC

Cold water is filled into a calorimeter and heated with a heating coil. The relation between the heating power and the temperature rise is displayed and the specific heat capacity of water is calculated.

Experiment examples – chemistry

Manual pH titration P1510260

Observing oscillating reactions, e.g. the Briggs-Rauscher reaction, is highly fascinating. If a plati-num electrode and an Ag/AgCl reference electrode are immersed into the reaction mixture, the electrochemical potential that changes along with the colour can be observed potentiometrically.





1 Cobra4 Sensor-Unit “pH and 2 x temperature NiCr-Ni” 12630.00

1 Holder for Cobra4 with a stand 12680.00


Also required: small parts, support materials, chemicals, and a PC





1 Cobra4 Sensor-Unit “pH and 2 x temperature NiCr-Ni” 12630.00





Quantity Name Ref no.



1 Cobra4 Sensor-Unit “Conductivity + (Pt 1000)” 12632.00




The electrical conductivity depends not only on the type and concentration of the electrolytes, but also on other parameters. If the temperature increases, one can usually also observe an increase in conductivity. At some point, however, a certain limit is reached, as of which the conductivity de-creases even if the temperature increases further. For aqueous solutions, this value is approximately 90°C. The temperature-dependence of the conductivity can be studied with this experiment.

pH titrations are among the most frequent tests of acids and alkaline solutions. If a pH electrode is used to determine the end point, it also is possible to test highly coloured solutions and to observe the changes of the pH value during the entire reaction. The Cobra4 interface records and evaluates the measurement data in a particularly comfortable way. If a burette is used as the volumeter, the titration solution can be added particularly easily.

Generation of alternating voltage, rectification, and smoothing P1331360

Specific heat capacity of water P1349160

Oscillating reaction P1510460

Temperature-dependence of the conductivity P1510160

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Evidence of why animals in colder regions are larger than their close relatives in warmer regions. One reason is that larger animals have lower heat loss than smaller animals since the surface area of their body in relation to their volume is smaller than that of small animals.

Experiment examples – biology





2 Cobra4 Sensor-Unit “Temperature, semiconductor -20…+110°C” 12640.00

Small parts, support materials, and a PC are also required







2 Cobra4 Sensor-Unit “Temperature, semiconductor -20…+110°C” 12640.00




Bergmann’s rule: loss of heat as a function of the surface area and volume of the body P1351060

The difference in the temperature rise of earth and water under heat radiation is studied. With the aid of this measurement, the term “heat capacity” can be introduced quickly and easily. The students will learn about the characteristics that are responsible for temperature changes. A practical example that can be stated is hot sand on a beach.






1 Cobra4 Sensor-Unit “Conductivity with a stainless-steel sensor” 12633.00

Small parts, support materials and a PC are also required

The conductivity of various drinking water samples is measured with a conductivity sensor and the results are compared with each other as well as the values of distilled mineral, spring, and river water. This experiment shows how much the quality of the drinking water of various locations in the same region may vary. The comparison leads to surprising results.

Why are energy-saving lamps so dark after they have been switched on? P1530060

The buoyancy force is equal to the magnitude of the weight of the displaced fluid. This experi-ment uses objects from our everyday lives (Coke bottle, modelling clay, and an egg) to determine as to how the buoyancy depends on the mass and volume of the object and on the density of the fluid in accordance with Archimedes’ principle.





1 Cobra4 Sensor-Unit “Weather:

air pressure, humidity, temperature, light intensity, and altitude” 12670.00








1 Cobra4 Sensor-Unit “Force +/- 40 N” 12643.00



The height of a tower can be determined with the aid of the weather sensor. The weather sensor calculates the change in altitude as a function of the change in air pressure with the aid of the barometric equation.

Energy-saving lamps (compact fluorescent lamps) are increasingly replacing standard light bulbs. However, they need some time until they reach maximum brightness, since their light intensity depends on the temperature.


1 Cobra4 Mobile-Link, set incl. storage batteries,

an SD memory card, a USB cable, and the “measure” software 12620.55

1 Cobra4 Sensor-Unit “Weather:

air pressure, humidity, temperature, light intensity, and altitude” 12670.00



Experiment examples – applied sciences

Comparison of the heat capacity of water and earth P1350960

Conductivity of various water samples P1520060

Floating and sinking P1530560

Measuring the height of a tower P1520362

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Cobra4 Sensor-Units

Cobra4 Sensor-Unit “Temperature, semiconductor -20…110°C” 12640.00This temperature sensor with a stainless-steel sheath can be directly connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link. Technical data:Temperature measuring range: -20…110°CResolution: 0.05°CAccuracy: ± 0.5°CMax. data throughput rate: 200 HzDimensions: l = 200 mm, = 6 mm, cable length = 120 cmConnector: 15-pin Sub-D

Cobra4 Sensor-Unit “2x Temperature NiCr-Ni” 12641.00

The Cobra4 Sensor-Unit “2x Temperature NiCr-Ni” is a microcontroller-controlled sensor for temperature measurements. It can be equipped with two NiCr-Ni thermocouples (type K) in order to measure up to two temperatures simultaneously or to measure a temperature difference. The unit can be connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link.Technical data:Temperature measuring range: -200°C to +1200°CResolution: 0.1 KMeasuring accuracy: corresponds to the accuracy of the sensors that are usedMax. data throughput rate: 5 HzDimensions: approx. 62 mm x 63 mm x 35 mm

Cobra4 Sensor-Unit “Thermodynamics, absolute pressure, and 2x temperature NiCr-Ni” 12638.00

The Cobra4 Sensor-Unit “Thermodynamics” is a microcontroller-controlled sensor for absolute pressure and temperature measurements. In order to measure the pressure in devices, the Sensor-Unit is equipped with an olive-type metal cou-pling with an external diameter of 8 mm. Via this coupling, the devices can be connected to the pressure sensor inside the housing. The Sensor-Unit can also be equipped with two NiCr-Ni thermocouples (type K) in order to measure up to two temperatures simultaneously or to measure a temperature difference and absolute pressure simultaneously. The unit can be connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link.Technical data: Temperature Pressure Measuring range: -200°C to +1200°C 0 to 2000 hPa, absoluteResolution: 0,1 K 0,1 hPaAccuracy: corresponds to the accuracy of the sensors that are usedMax. data throughput rate: 5 HzDimensions: approx. 62 mm x 110 mm x 35 mm

Cobra4 Sensor-Unit “Chemistry, pH, and 2 x temperature NiCr-Ni” 12630.00

The Cobra4 Sensor-Unit “pH and 2x temperature NiCr-Ni” is a microcontroller-controlled sensor for pH, potential, and temperature measurements. It can be equipped with two NiCr-Ni thermocouples (type K) and a combined pH measuring and reference electrode or a redox electrode in order to measure up to two temperatures and a pH or potential value simultane-ously. The unit can be connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link.Technical data: Temperature pH Potential Measuring range: -200°C to +1200°C 0 to 14 pH -2000 to +2000 mVResolution: 0,1 K 0,01 pH 0,1 mVAccuracy: corresponds to the accuracy ±0,5% ±0,5% of the sensors that are usedMax. data throughput rate: 5 HzDimensions: approx. 62 mm x 63 mm x 35 mm

Thermocouples NiCr-Ni (type K)

Several different types of NiCr-Ni thermocouples with a standard type K 2-pin flat connector that is free from thermoelectric voltage. These thermocouples can be connected to the Cobra4 Sensor-Units “2x temperature” (12641.00), “Thermodynamics” (12638.00), and “Chemistry” (12630-00).Ref. no. Name Description 13615.02 Thermocouple NiCr-Ni, single type, Glass silk insulation, spot-welded tip; -40…+500°C Response time: approx. 2 s; l = -; = 1.0 – 2.0 mm Cable length: 1.5 m 13615.01 Thermocouple NiCr-Ni, microsheath, Magnesium oxide insulation, sheath made of stainless steel; -50…+1100°C Flexible: bend radius approx. 1 mm; l = 100 mm; = 0.5 mm Response time: < 1 s; Cable length: 2.0 m13615.03 Immersion probe NiCr-Ni, stainless steel, For liquids and gases, thermocouple in a protective steel tube; -50…+1000°C Response time: approx. 5 s; l = 120 mm; = 3.0 mm; Cable length: 1.0 m13615.05 Immersion probe NiCr-Ni, Teflon, For liquids and gases, thermocouple in a protective PTFE tube; -50…+300°C Response time: approx. 10 s; l = 250 mm; = 7.0 mm Cable length: 1.5 m13615.04 Surface probe, NiCr-Ni, up to 1000°C To measure surface temperatures; thermocouple on a copper plate; Response time: approx. 3 s; l = 120 mm; = 4.0 mm (plate)

Cobra4 Sensor-Unit “pH, BNC connector” 12631.00

pH electrodes with BNC connectors

Cobra4 Sensor-Unit “Conductivity+, conductivity/temperature (Pt1000)” 12632.00The Cobra4 Sensor-Unit “Conductivity/temperature (Pt1000)” is a microcontroller-controlled sensor with a 5-pin diode socket for connecting conductivity sensors with a cell constant of k = 1.00 cm–1 or Pt1000 temperature sensors. The Sensor-Unit can be directly connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link.Technical data:Temperature Temperature measuring range: –20°C to +150°C Resolution: 0,1 K Measuring accuracy: ±0.5K (in the range of 0…100°C)Conductivity Measuring range 1: 0 to approx. 2,500 μS/cm Measuring accuracy: 4% of the measured value ±0.15 μS/cm Measuring range 2: 0.0 to approx. 45,000 μS/cm Measuring accuracy: 4% of the measured value ±3 μS/cm Measuring range 3: 0.0 to approx. 1,100 mS/cm Measuring accuracy: 4% of the measured value ±0.05 mS/cmMeasuring cycle: 0.8…2s (will be set automatically)Dimensions: approx. 62 mm x 63 mm x 35 mm

Conductivity/temperature sensor Pt1000 13701.01This conductivity sensor is suitable for the Sensor-Unit “Conductivity” (12632.00) and has an integrated Pt1000 temperature sensor and a 5-pin diode connector.Technical data:Cell constant: k = 1.0/cm (comes with a test certificate with the exact value)External diameter: 12 mm, Min. immersion depth: 10 mm

Cobra4 Sensor-Unit “Conductivity, with a stainless-steel sensor” 12633.00

All the pH and redox electrodes with a BNC connector can be connected to the Cobra4 Sensor-Units “Chemistry” (12630.00) and “pH, BNC connector” (12640.00). For the measurement value display, the user can choose between the units pH and mV. The sensors can be calibrated by a one-point or two-point calibration.46265.15 pH electrode, plastic, gel-filled, BNC46266.15 pH electrode, plastic, refillable, BNC46268.10 pH electrode, glass, refillable, BNC46267.10 Platinum redox electrode, plastic, gel-filled, BNC

Temperature immersion probe Pt1000 12123.00This Pt1000 temperature sensor is suitable for the Sensor-Unit “Conductivity” (12632.00) and has a stainless-steel sheath and a 5-pin diode connector.Technical data:Measuring range: -20…+850°CDiameter: 3.2 to 4.0 mm Cable length: 1.5 m

The Cobra4 Sensor-Unit “Conductivity” has a cable-bound conductivity measuring cell with two robust stainless-steel pins in a plastic sheath and an integrated temperature sensor for the temperature compensation of the conductivity values. This sensor unit is particularly suitable for field experiments. It can be directly connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link.Technical data: Temperature: Conductivity Measuring range: –200°C to +1200°C 0,2...2.000 µS/cm 10...20.000 µS/cm 100...200 mS/cmResolution: 0,1 K 0,1 µS/cm / 1 µS/cm / 10 µS/cmMeasuring accuracy: ±0,8 K 6% of the measured value ±0.2 μS/cmMax. data throughput rate: 1 HzCable length: 60 cmDimensions: ca. 62 mm x 63 mm x 35 mm

The Cobra4 Sensor-Unit “pH, BNC connector” is a microcontroller-controlled sensor for pH and potential measurements. It can be equipped with a combined pH measuring and reference electrode or with a redox electrode in order to measure the pH or potential values. The unit can be connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link.Technical data:pH measuring range: 0…14 pHResolution: 0.01 pHMeasuring accuracy: ± 0.5%Max. data throughput rate: 5 HzDimensions: approx. 62 mm x 63 mm x 35 mm

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Cobra4 Sensor-Units Cobra4wireless

The Cobra4 Sensor-Units “Force ± 4N and ± 40N” comprise a strain gauge that converts the mechanical load into an electrical signal. A weight holder plate can be fastened to the upper end of the housing in order to measure the weights that are put on the plate. The lower end of the device is equipped with a hook to attach the weights. The Cobra4 Sensor-Units “Force” are held at the top or at the bottom in a mechanically safe manner by a threaded rod with an M6 thread. The unit can be connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link.Technical data: 12642.00 12643.00Measuring range: -4 to +4 N -40 to +40 NMeasuring accuracy: 0.2 mN 2 mNMax. data throughput rate: 16 Hz 16 HzDimensions: approx. 62 mm x 110 mm x 35 mm approx. 62 mm x 70 mm x 35 mm

12642.00 Cobra4 Sensor-Unit “Force ±4 N”12643.00 Cobra4 Sensor-Unit “Force ±40 N”

The Cobra4 Sensor-Units “Force ± 4N and ± 40N” comprise a strain gauge that converts the mechanical load into an electrical signal. A weight holder plate can be fastened to the upper end of the housing in order to measure the weights that are put

Cobra4 Sensor-Unit “Force 4 N”, Cobra4 Sensor-Unit “Force 40 N”

Cobra4 Sensor-Unit “Timer/Counter” 12651.00

Cobra4 Sensor-Unit “Electricity”, current/voltage, ± 6A, ± 30V 12644.00

Fuse-protected current and voltage sensor with 4-mm-sockets. The voltage and current inputs are galvanically isolated. The unit can be connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link.Technical data: Current VoltageMeasuring range: -6 to +6 A -30 to +30 VResolution: 3 mA 15 mVInternal resistances: 1 MΩ 33 mΩMax. data throughput rate: 140 kHz 140 kHzDimensions: approx. 62 mm x 110 mm x 35 mm

Cobra4 Sensor-Unit “Acceleration, 3D acceleration, ± 2 g, ± 6 g” 12650.00

The Cobra4 Sensor-Unit “Acceleration” has internal acceleration sensors for the three directions in space (x, y, and z). The unit can be connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link.Technical data: Measuring range 1 Measuring range 2Measuring range: -2 g to +2 g -6 g to +6 gResolution: 1 mg 5 mgMax. data throughput rate: 142 Hz 142 HzDimensions: approx. 62 mm x 63 mm x 35 mm

Cobra4 Sensor-Unit “Tesla” 12652.00

The Cobra4 Sensor-Unit “Tesla” is used to measure the magnetic field strength in DC and AC fields. The Hall probes for axial (13610.01) and tangential (13610.02) measurements are connected to the unit via a 5-pin diode connector. The unit can be used in combination with the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link.Technical data:Measuring ranges (resolution): ± 10 mT (10 μT) / ± 100 mT (100 μT ) / ± 1 T (1 mT)Compensation: ± 1 T in all of the measuring rangesMeasuring accuracy: DC field: ± 2% / AC field: ± 5%AC field measurement: effective value (crest factor up to 5) / max. frequency: 1 kHzMax. data throughput rate: 5 HzDimensions: approx. 62 mm x 63 mm x 35 mm

Hall probes for the Cobra4 Sensor-Unit “Tesla”

Cobra4 Sensor-Unit “Electrophysiology: ECG, EMG, EOG” 12673.00

The Cobra4 Sensor-Unit “Weather” can measure the following quantities simultaneously: air pressure, relative humidity, air temperature, light intensity, and altitude (based on the air pressure). The unit can be connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link.Technical data: Air pressure TemperatureMeasuring range: 10 to 1100 hPa -40 to +125°CAccuracy: ± 1.5 hPa ± 0.5°C Relative humidity Light intensityMeasuring range: 0 to 100% 0 to 10,000 lxAccuracy: ± 5% ± 5%Wavelength accuracy: 320…1050 nmMax. data throughput rate: 5 HzDimensions: approx. 62 mm x 70 mm x 35 mm

The Cobra4 Display-Connect set is a combination of a transmitter and receiver for the radio-based communication between a Cobra4 Mobile-Link (12620.55) and up to two digital large-scale displays (07157.93) with 5 selectable transmission channels and a carrier frequency of 433 MHz. With this set, the measurement data can be displayed in a clearly visible manner, even in large auditoriums, classrooms, or lecture halls. All you have to do is connect the transmission unit between a Cobra4 Sensor-Unit and the Cobra4 Mobile-Link and attach the reception unit of the Display-Connect to the input of the large-scale display. The transmitter and receiver are supplied with power via the devices to which they are connected. The measurement series can be recorded in parallel via the SD card of the Mobile-Link.Technical data: Receiver: TransmitterConnector: 9-pin Sub-D connector 15-pin Sub-D connectorChannel switching: via a slide switch via the Mobile-Link softwarePower supply: via the Mobile-Link via the large-scale displayDimensions: approx. 43 x 21 x 112 mm approx. 69 x 57 x 72 mmTransmitting power: 10 mWRange: approx. 30...40 m without obstacles12623.88 Cobra4 Display-Connect, set comprising a transmitter and a receiver for using the Cobra4 Mobile-Link with digital large-scale displays12623.01 Cobra4 Display-Connect RX, receiver (for the digital large-scale display)12623.00 Cobra4 Display-Connect TX, transmitter (for the Cobra4 Mobile-Link)07157.93 Digital large-scale display, RS232 interface

SD memory card for the Cobra4 Mobile-Link, 2 GB, 20 MB/sec 12620.01

Commercially-available, fast SD memory card incl. transport case.Technical data:Type: SecureDigitalCard; manufacturer: SanDisk, Extreme IIIStorage capacity: 2048 MBWrite/read speed: 20 MB/sec

Card reader for SD cards 12620.03

Rechargeable metal hydride batteries and a charger for Cobra4

USB 2.0 single-slot card reader for SD and MMC cards up to 2 GB. Can be used without a driver under Windows ME, 2000, XP, Vista, and Mac OS 9.1, OS X. Reads and writes SecureDigital and MultiMedia cards.Technical data:Data transfer rate: up to 18.5 MB/s with SD cards (11 MB/s with MM cards)

The Cobra4 Sensor-Unit “Weather” can measure the following quantities simultaneously: air pressure, relative humidity, air temperature, light intensity, and altitude (based on the air pressure). The unit can be connected to the Cobra4 Wireless-Link,

Cobra4 Sensor-Unit “Weather: air pressure, humidity, temperature, light intensity, and altitude” 12670.00

Dimensions: approx. 62 mm x 70 mm x 35 mm

The Cobra4 Display-Connect set is a combination of a transmitter and receiver for the radio-based communication between a Cobra4 Mobile-Link (12620.55) and up to two digital large-scale displays (07157.93) with 5 selectable transmission channels

Cobra4 Display-Connect

Axial Hall probe: Hall probe on a tube probe with a handle; probe length/diameter: 300 mm/6 mmTangential Hall probe: particularly flat Hall probe with a handle; dimensions of the probe carrier: (1.1 x 5.0 x 70) mm13610.01 Hall probe, axial13610.02 Hall probe, tangential

All of the Cobra3 units that require a power supply use rechargeable metal hydride batteries with low self-discharge (type Mignon (AA), voltage 1.2 V, capacity 2000 mAh). They can be recharged quickly with the matching quick charger (for 4 rechargeable Mignon (AA) or Micro (AAA) batteries, adjustable charging current of 2100 mA or 850 mA, trickle charging).07930.03 Rechargeable metal hydride battery, type Mignon (AA), 1.2 V, 2000 mAh, type Eneloop, pack of 407930.99 Quick charger for rechargeable metal hydride batteries, 100...240 V

The Cobra4 Sensor-Unit “Timer/Counter” is used for the time measurement of switching signals and signal levels of up to four fork-type light barriers or measuring microphone, motion sensor, falling sphere apparatus, or other devices with TTL-compatible signals. Device for external triggering can be also connected. This enables experiments concerning linear motion, including collision experiments with demonstration track, free fall experiments with picket fences or a falling sphere apparatus as well as the measurement of oscillations, rotational motion, and frequency measurements in acoustics. Connection to Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link possible.Technical data:Power supply: via basic unit; in case of three or more light barriers, delivered use external power supply unit.Current consumption: < 300 mA Resolution: 1 microsecond Dimensions: approx. 62 mm x 110 mm x 35 mm

Accessories for the Cobra4 Sensor-Unit Timer/Counter:11207.20 Fork-type light barrier, compact (up to 4)12651.01 Cobra4 adapter for Sensor-Unit “Timer/Counter” for connection of light barriers03543.00 Measuring microphone with an amplifier02502.88 Falling sphere apparatus12004.10 Motion sensor with cable

18 19

The Cobra4 Sensor-Unit “Acceleration” has internal acceleration sensors for the three directions in space (x, y, and z). The unit can be connected to the Cobra4 Wireless-Link, Cobra4 Mobile-Link, or Cobra4 USB-Link.

Cobra4 Sensor-Unit “3D-Acceleration” ± 2 g, ± 6 g 12650.00

The Cobra4 Sensor-Unit “Electrophysiology” is used for the electrophysiological measurements of the heart, eye, and muscle activity. The measuring electrodes are connected to 3.5-mm-sockets with colour assignment via three separate and shielded measurement leads. The unit can be connected to the Cobra4 Wireless-Link and to the Cobra4 USB-Link.Technical data:Signal filter: ECG filter: 0.03 Hz…100 Hz EMG filter: 80 Hz…5000 Hz EOG filter: 0.03 Hz…50 HzMax. data throughput rate: 1 kHzDimensions: approx. 62 mm x 110 mm x 35 mmAccessories for the Cobra4 Sensor-Unit “Electrophysiology”:12673.01 Individual measurement leads, shielded, 3 pieces with colour coding (red, yellow, and green), with 3.5-mm TRS connectors for the connection to the Sensor-Unit and 2-mm-connectors for the connection to permanent and disposable electrodes12673.02 Alligator clips for disposable electrodes, 3 pieces


PHYWE equipment sets

Experimentation case “Environment and field experiments”Ref. no. 12622.77

■ Contains all of the components for four work-

groups to perform environmental field

experiments without any other preparation

■ Didactic background: the students discover

various ecological aspects of their local

environment

■ Literature with detailed experiment descrip-

tions concerning ecological standard topics

with the main focus on field experiments

■ 4 Mobile-Links and 4 sensors: temperature,

pH, conductivity, weather: air pressure,

humidity, light intensity, temperature and

altitude (8 parameters can be measured)

■ Includes the data processing software measure

and an experiment manual

■ High-quality aluminium case with foam

padding

The following items are included in the case:

Calibration solutions and tablets, measuring

vessels, a pH electrode with a protective sheath,

SD memory cards, data transfer cables, storage

batteries and backup storage batteries, and a fast

charger.

The experimentation case “Environment and field

experiments” is also available with one instead of

four Mobile-Links. The rest of the scope of supply

is identical.

Basic set physicsRef. no. 12605.89

■ Optimally suitable for demonstration

experiments concerning mechanics, electricity,

and thermodynamics

■ Experiments can be performed right in the

middle of the classroom since the system is

independent from the location of the PC

■ Easy realisation of measurements in reference

systems that are in motion (rotation, free fall,

parabolic throw, oscillations, etc.)

■ Can be combined with a laptop and used in

the field or schoolyard (accelerations during

jumping, driving, etc.)

■ Sturdy case with foam padding


1 Cobra4 Wireless Manager and 1 Cobra4

Wireless-Link for wireless data transfer, the

sensors “Temperature”, “Current/voltage”, “3D

acceleration”, and “Force ± 4 N”, and the soft-

ware measure for recording and evaluating the

measurement data.

Basic set chemistryRef. no. 12606.89

■ Optimally suitable for demonstration

experiments in chemistry

■ Measurement of important parameters, such

as pH, conductivity, and temperature

■ The PC can be set up far away from the

experiment so that it is protected against

aggressive solutions

■ The set can also be used outdoors for field

experiments (e.g. for ecological measurements)

in combination with a laptop

■ The set comes supplied in a robust case with a

foam inlay


1 Cobra4 Wireless Manager and 1 Cobra4 Wire-

less-Link for wireless data transfer, the sensors

“Chemistry” and “Conductivity”, a pH electrode, a

conductivity-temperature probe, a temperature im-

mersion probe NiCr-Ni (Teflon), 2 protective sheaths

for the electrodes, and the software measure for

recording and evaluating the measurement data.

Cobra4 extension for TESS

Ref. no. 12604.88

Cobra4 Wireless extension set for TESS in a woo-

den box. Optimally suitable for computer-assisted

student experiments with PHYWE experiment sets

TESS mechanics, electricity building block system,

and heat. More than 20 student experiments can

be performed easily and comfortably.

The wooden box contains:

Cobra4 Wireless Manager, Cobra4 Wireless-

Link, Sensors: 1 x Temperature-Semiconductor

-20..110°C, 1 Sensor Electricity and Force 4 N,

as well as accessories.

The TESS set is also available in a plastic case

(12604.77).

Class set Mobile-Link 8xRef. no. 12621.88

■ Perfectly suitable as a digital multimeter set for

various parameters

■ For student experiments without a PC, field

experiments, project days, etc.

The case includes:

8 Mobile-Links, 8 SD memory cards, additional

backup storage batteries (AA), Mignon, 1.2 V,

2700 mAh, fast charger for the storage batte-

ries, and the measure software for transferring

the data to the PC as well as for analysing them.

Other sets are available upon request!

Basic set Cobra4 Display-ConnectRef. no. 12607.89

■ Uncomplicated transfer of the measurement

values of the Cobra4 Mobile-Link to a large-

scale display

■ Parallel transfer of values to several large-scale

displays

■ Easy to use: plug & play

■ Didactic design, since the unit of the measure-

ment value is also displayed

■ 56 mm high LED display that is clearly visible

even from a distance

The aluminium case includes:

Cobra4 Display-Connect, Cobra4 Mobile-Link,

digital large-scale display, 1 Cobra4 Sensor-Unit

“Weather”, fast charger, and the Cobra 4 manual.

Basic set chemistryRef. no. 12606.89

Experimentation case “Environment

Class set Mobile-Link 8x

Basic set physics

Basic set Cobra4 Display-ConnectRef. no. 12607.89Cobra4 extension for TESS

Ref. no. 12604.88

Cobra4wireless

20 21


Cobra4 - System Overview

How would you like to measure? Basic units

What would you like to measure?* Sensors

Measuring and evaluation software

Temperature Cobra4 Sensor-Unit “Temperature, semiconductor -20…110°C” 12640.00

Cobra 4 Sensor-Unit “2 x temperature NiCr-Ni”1) 12641.00

pH Cobra4 Sensor-Unit “Chemistry: pH and 2 x temperature NiCr-Ni”1) 12630.00

Cobra4 Sensor-Unit “pH, BNC connector”1) 12631.00

Conductivity Cobra4 Sensor-Unit “Conductivity (Pt 1000)”1) 12632.00

Cobra4 Sensor-Unit “Conductivity with a stainless-steel sensor” 12633.00

Force Cobra4 Sensor-Unit “Force ± 4 N” 12642.00

Cobra4 Sensor-Unit “Force ± 40 N” 12643.00

Current/voltage Cobra4 Sensor-Unit “Electricity, ± 30 V, ± 6 A” 12644.00

Acceleration Cobra4 Sensor-Unit “Acceleration, ± 2 g, ± 6 g” 12650.00

Weather Cobra4 Sensor-Unit “Weather: air pressure, humidity, temperature, light intensity, altitude” 12670.00

ECG, EMG, EOG Cobra4 Sensor-Unit “Electrophysiology: ECG, EMG, EOG” 12673.00

Pressure and temperature Cobra4 Sensor-Unit “Thermodynamics: 2x temperature, pressure” 1) 12638.00

Magnetic field Cobra4 Sensor-Unit “Tesla” 1) 12652.00

Education in the natural sciences begins in the

auditorium or classroom, but our service starts

long before all that. Our extensive and perfected

customer care programme is based on the three

columns Campus, Pre-Sales, and After-Sales.

Campus is a training and education programme

that provides our end users, sales partners, and

employees with the opportunity to always be

up-to-date in terms of the scientific and techni-

cal developments at PHYWE. Whether it is online,

at the customer’s site, or in-house at PHYWE in

Göttingen: our Campus is always there for you.

The Pre-Sales area includes – among other

things – the scientific contributions of PHYWE at

specialised conferences, product and system

Excellent products, consulting, and service PHYWE provides assistance and brings people together

demonstrations, and seminars, but also consul-

ting and support in the definition of projects and

the selection of the optimal solutions and sys-

tems for your specific needs. We ensure that you

make the right decisions, and that you receive

and use the best cost-performance ratio. Please

do not hesitate to ask us! With our After-Sales

programme, we ensure that you can use your

PHYWE product efficiently for a long time. This is

indeed reliable protection for your investment.

We are there for you if you have queries concer-

ning the respective installation or utilisation, but

also for the supply of spare parts or in the event

of warranty claims and repairs. Our technical

hotline helps and supports you.

1. Wireless Wireless link, optimal for:

– Demonstration experiments and student experiments

– Experiments with moving objects (e.g. rotation, linear movement, acceleration, etc.)

– Higher comfort concerning the experiment set-up (no cables, and compact set-ups can be transported as a whole)

Ref. no.

Cobra4 Wireless Manager (per Unit 1 PC required) 12600.00

Cobra4 Wireless-Link (per Cobra4 Sensor-Unit 1 Wireless-Link required) 12601.00

Cobra4 Remote-Link (To Start/Stop of measurement on radio, optional) 12602.00

or

2. USB USB cable connected to a PC, optimal for:


– Particularly quick measurements (acoustics, electricity, etc.)

– Connecting several sensors via a USB hub

Cobra4 - USB-Link 12610.00

or

3. Mobile Hand-held measuring instrument used as a data logger, optimal for:

– Field experiments with groups of students, e.g. project days, excursions, etc.

– Student experiments without PC

– Demonstration experiments without PC (with display connect and digital large-scale display)

Cobra4 Mobile-Link, incl. SD memory card 12620.55

Cobra4 Display-Connect, set including a transmitter and a receiver 12623.88

Software “measure”, single-user and school licence (FREE updates, supports ALL of the Cobra4 Sensor-Units) 14550.61

Handbook Cobra4: physics, chemistry, biology, and everyday-life phenomena 01330.02 Handbook for the student experiments “Cobra4 environment and field experiments” 12622.02

Cobra4 Mobile-Link, experimentation case “Environment and field experiments” for 4 workgroups 12622.77

Cobra4 Mobile-Link, experimentation case “Environment and field experiments” for 1 workgroup or as a teacher demonstration set 12619.77

Basic set physics Cobra4 wireless 12605.89

Basic set chemistry Cobra4 wireless 12606.89

Cobra4 Wireless, extension set “TESS mechanics, electricity building block system, and heat”, in a wooden box 12604.88

Cobra4 Wireless, extension set “TESS mechanics, electricity building block system, and heat”, in a plastic case 12604.77

Cobra4 Mobile, class set with 8 devices, in a plastic case 12621.88

Cobra4 Display-Connect, basic set with a digital large-scale display, Mobile-Link, and weather sensor in an aluminium case with a manual 12607.89

Other cases and equipment sets are available upon request

Handbook Cobra4: physics, chemistry, biology, and everyday-life phenomena 01330.02 Handbook for the student experiments “Cobra4 environment and field experiments” 12622.02

Literature

* The Cobra4 system is continuously being extended by other measuring quantities. Sensors for movement (timer-counter, distance), CO2, and pulse

will soon be added to the product range. 1) Suitable sensing elements for this sensor can be found on pages 16 to 19.

– Demonstration experiments and student experiments – Demonstration experiments and student experiments

– Experiments with moving objects (e.g. rotation, linear movement, acceleration, etc.)

– Higher comfort concerning the experiment set-up (no cables, and compact set-ups can be transported as a whole)


– Particularly quick measurements (acoustics, electricity, etc.)

– Connecting several sensors via a USB hub

Cobra4 - USB-Link 12610.00







or

– Field experiments with groups of students, e.g. project days, excursions, etc.

– Student experiments without PC

– Demonstration experiments without PC (with display connect and digital large-scale display)

Cobra4 Mobile-Link, incl. SD memory card 12620.55

Cobra4 Mobile-Link, experimentation case Cobra4 Mobile-Link, experimentation case

Cobra4 Mobile-Link, experimentation case

Cases/equipment sets

Customer Services

Pre-SalesSupport

After-SalesTechnical Support

CampusTrainings

In-house On-siteTechnical Hotline

RepairConference Consulting

Cobra4wireless

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T. +32 (0) 436 162 - 30F. +32 (0) 436 162 - 48 + 49

[email protected]

PHYWE Systeme GmbH & Co. KG Robert-Bosch-Breite 10 D-37079 Göttingen

T. +49 (0) 551 604 - 0F. +49 (0) 551 604 - 107

[email protected]


Our sales partners:

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First-class service by PHYWE Consultation required? Or you can order directly under:

Contacts

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Cobra4wireless

Documents

EN Cobra4: PHYWE's wireless measuring system