524005 instruction sheet - home - ld didactic

Instruction sheet 524 005

Mobile-CASSY 2 (524 005)Mobile-CASSY 2 WiFi (524 005W)

1Inputs A and B for U (voltage), I (current) andCASSY sensors

2 Display with main menu

3 Type K socket for temperature sensor

4 USB A socket for USB memory stick

5 USB B socket for computer

6 Socket for plug-in power supply

7 LED (green and yellow)

8 Connector for optional Kensington lock

9 Touch wheel

Fig. 1: Connectors on the top of Mobile-CASSY 2:CASSY sensors S and sensor boxes (top)CASSY sensors M (left and right)Voltage U (+: red and -: black)Current I (+: black und -: blue)

Safety notes

Electrical safety:

• Do not apply voltage in excess of 30 V to the Mo-bile-CASSY 2 unit or any sensors connected to it.

• Make sure any necessary ground connections be-tween sensors and the black socket of the Mobile-CASSY unit are made properly.

• GM boxes with no rear cover (pre-1992) may notbe used.

1 Description

Mobile-CASSY 2 is a universal measuring instrument designedto measure voltage, current, power, energy and temperature.Many more quantities (e.g. displacement, velocity, force, pH,resistance of skin) can also be measured by connecting suit-able CASSY sensors.

The measurement values are shown on the Mobile-CASSYdisplay. Mobile-CASSY can make individual measurements orrecord them over a period of time. They can be listed in tablesor plotted as a graph, evaluated and saved as a file (data log-ger function).

Such files can be further processed on a computer using suit-able software (e.g. CASSY Lab 2 or Excel).

Alternatively the Mobile-CASSY 2 unit can be connected to acomputer while the measurements are being made and themeasurements can then be processed using CASSY Lab 2(524 220). This requires a licence (activation code) for CASSYLab 2.

• Sensors from the CASSY family can be plugged into thesensor sockets at any time and will be detected automat-ically.

• More details about the quantities which can be mea-sured and the ranges over which they can be measuredare provided in the instructions for the CASSY sensorsin question.

© by LD DIDACTIC GmbH · Leyboldstraße 1 · D-50354 Hürth · www.ld-didactic.com

Tel: +49-2233-604-0 · Fax: +49-2233-604-222 · Email: [email protected] · Technical alterations reserved

2 Technical data

Graphic display: 9 cm (3,5"), QVGA, colour, highbrightness (adjustable up to 400 cd/

m2)Operation: Capacitive touch wheelInputs: 3 (can be used simultaneously)Input A: U (voltage) or CASSY sensor or

sensor MInput B: I (current) or CASSY sensor or

sensor MInput ϑ: TemperatureSockets for U and I: 4-mm safety socketsVoltage ranges U: ±0.1/±0.3/±1/±3/±10/±30 VCurrent ranges I: ±0.03/±0.1/±0.3/±1/±3 ASocket for ϑ: Type K socketTemperature ranges ϑ: -200 ... +200 °C / -200 ... +1200 °CSensor sockets: 2 for CASSY sensors and 2 for M-

series sensorsSampling rate: max. 500,000 values/secondResolution of analoginputs: 12 bitsResolution of timerinputs: 20 nsLoudspeaker: Built-in for key tones and Geiger

counter (can be deactivated in eithercase)

Data memory: 10,000 values for each set ofmeasurements, built-in Micro-SD card(4 GB) for more than a thousandmeasurement files and screenshots

WiFi: 802.11 b/g/n as access point or client(WPA/WPA2, 524 005W only) – Aclient connection to an Internet-enabled router/hotspot also enablesthe Internet connection of connectedtablets or smartphones

TCP server: integrated (524 005W only, to connectto CASSY Lab or the CASSY App ona PC or tablet)

HTTP server: integrated (524 005W only, display ofmultimeter, table, and diagram in abrowser)

WebSocket server: integrated (524 005W only, distributecurrent measurement data to up tothree clients)

VNC server: integrated (524 005W only, remoteoperation by transmitting the displaycontent to a client)

USB ports: 1 for USB memory stick, 1 for PCBattery capacity: 14 Wh (6 x AA NiMH, replaceable)Duration of use on fullcharge:

8 hours of operation, several years onstand-by

Charging current: 200 mA (approx. 10 hours chargingwhen battery is completely flat)

Stand-by current: < 50 µAStand: Built-inKensington lock: Built-in connector for optional anti-

theft deviceSupply voltage: 12 V AC or 15 V DCDimensions: 175 mm x 95 mm x 40 mmWeight: 500 g

3 Equipment included

• Mobile-CASSY 2• Plug-in power supply with safety transformer conforming

to DIN EN 61558-2-6• NiCr-Ni temperature sensor (for up to 200 °C)• Brief instructions (see section 15)

4 Accessories

• Charging adapter for 4 Mobile-CASSY 2 (524 0034)• Storage tray for 8 Mobile-CASSY 2 (524 0039)• Apps for Mobile-CASSY 2 (see section 12)• CASSY sensors as needed, Mobile-CASSY 2 is compat-

ible with all CASSY sensors and sensor boxes• USB cable (available from computer stores)• USB memory stick (available from computer stores, for

saving measurements and screenshots to externalmemory)

5 Operation

5.1 On first use

• Study the accompanying brief instruction sheet (see sec-tion 15)

• Press OK button (you need to press it and not just touchit)

Mobile-CASSY 2 turns on and the display shows a list of lan-guages available to you, including German, English, French,Spanish and others where applicable.

• Select the language you want using the cursor keysand , then press OK to confirm. In this case you onlyneed to touch the keys.

• If the rechargeable battery is not fully charged, chargingcan be started by plugging in the power supply unit pro-vided.

5.2 Selecting and configuring values to measure

• Turn on Mobile-CASSY 2• Plug in the desired sensor• If the quantity you wish to measure is not displayed au-

tomatically, select the one you want from the displayedlist using and . You can then activate or deactivateit via the OK button. A quantity which is currently activat-ed is indicated by means of a small red bar over its listentry (cf. Fig. 2).

• You can select the measuring range and configure othersettings as required using the menu for the quantity con-cerned. To access the menu, use and to acti-vate the menu entry for the quantity and then press(MENU). Once you have configured the settings usingor , you should then exit the menu.

The setting options which can be configured depend on thesensor being used. Some typical possibilities are as follows:

• Measuring range (including automatic)• Recording of instantaneous values, average values and

RMS values.• → 0 ← for calibrating zero values for the measurement.• Zero points at left, right or centre of analog displays and

graph axes• Calibration of measurements, e.g. pH (see example in

section 14).

2 / 12 Instruction sheet 524 005



Fig. 2: As soon as the unit is switched on in the absence of any othersensor, it will immediately measure voltage U and display itboth digital (top) and analog (bottom) formats.

Notes regarding displayed values

Some quantities cannot be measured directly but need to becalculated from other measurements (e.g. derivatives and inte-grals). Integrated values (e.g. energy) are only calculated anddisplayed during the course of measurements (see section 5.4)and once measurements have ended, the last calculated valueremains displayed.

By default, values to be displayed are averaged over 100 ms.This can be modified by setting the recording mode to instan-taneous values or RMS values, if necessary.

Values in red indicate that the configured measuring range hasbeen exceeded.

Notes regarding measurements of power and energy

Mobile-CASSY 2 has been optimised for simultaneous mea-surement of U (voltage), I (current), P (power) and E (energy).In particular, the measuring range settings for P and E arealways adjusted automatically depending on the measuringranges and values measured for U and I. The energy meter on-ly runs while a set of measurements is in progress (see sec-tion 5.4).

When both U and I are activated and being displayed as RMSvalues, then it is also possible to activate power factor, cos φ.The latter is always taken into account when active power P isto be displayed.

5.3 Switching between measured quantities

The quantities which have been activated for measurement areindicated by a small red bar above their listing and all of themare measured simultaneously. It is not necessary to switchback and forth between them.

It is, however, possible to switch between the displays of themin order to demonstrate or check the values measured. Thebest way to do this is to use the touch wheel. A short turn ofthe touch wheel in the desired direction allows you to switchbetween two adjacent displays.

The table and diagram displays are at the end of the list (seealso section 10.3).

5.4 Starting a set of measurements

Once all the quantities to be measured have been activated,selecting is sufficient to start the measurements and to stop

Fig. 3: Typical measurement parameters for automatic measure-ment of voltage with a trigger (rising edge through 0 V) andoptional pre-trigger (here measurements start from 10 ms be-fore the instant of the trigger).

them when you are finished. Standard settings for durationof measurement (measuring time) and measuring interval areused. These depend on the first quantity selected but can bealtered before measurements are started.

5.5 Setting measurement parameters

Fig. 3 shows a typical configuration of measurement parame-ters. Measurements recorded can be saved or deleted via the

menu (see section 6).

The recording of measurements can either be controlled man-ually or automatically:

• Manual: when → Start Measurement is activated,one set of measurements only is recorded with the pre-sent measurement values.

• Automatic: measurements are recorded over a pre-setduration at pre-set intervals It is possible to configuretrigger and (pre-trigger) settings for this. It is not essen-tial to stipulate a measurement duration. If no durationis configured, the measurement will continue until it isstopped manually or until the internal memory for the setof measurements in question is full (10,000 values).

• Repeating: This is similar to automatic mode but themeasurements are repeated continuously. A durationmust be stipulated for this mode.

Notes regarding measurement intervals

For rapid measurements made at an interval of less than100 ms, please take the following into account:

• Even if the display is showing average or RMS values,the actual measurements in the set are still instanta-neous. The same settings can then be used for evaluat-ing the results (e.g. RMS values and curves). Averagesand RMS values are only measured and displayed be-fore or after such rapid measurements.

• Automatic setting of measuring ranges is disabled duringrapid measurements to ensure that no values are omit-ted.

For automatic or repeated measurements involving gate times,e.g. when measuring rates, the pre-set measuring interval willbe delayed until all of the relevant gate times have elapsed. Ifthe gate time is restarted by pressing → 0 ← during the courseof measuring such a quantity, this will also lead to further con-trolled delay to the recording of measurements.

Instruction sheet 524 005 3 / 12



Notes regarding measuring times

The unit selected for the duration of the measurement (mea-suring time) will also be used as the unit for the time axis. Ifthe duration is given in hours, then the time axis will also bescaled in hours. In such cases, though, the time axis will notstart from 0 but from the time of day when the measurementsstarts. When making environmental measurements, for exam-ple, this means it is possible to see the time of day when themeasurements were recorded. If this is not what is wanted, itis possible to reset the measurement time to minutes after themeasurement has been made, from where it can then be setback to hours.

For measurements of lengthy duration, make sure that the bat-tery is sufficiently charged or use the plug-in power supply.

Notes regarding automatically deleted measurements

Measurements are not usually deleted without a confirmationprompt being displayed. When a new measurement is started,there is also a prompt asking whether the existing measure-ment values should be deleted (except in expert mode, seesection 10.1).

But: If a USB cable is plugged in or a WiFi connection toCASSY Lab or the CASSY App is established, all measuredvalues already recorded will be lost in the process because thedata acquisition will then be completely taken over by CASSYLab or the CASSY App.

5.6 Evaluations within the table

The table is shown to the right of the displayed measurementsand can easily be accessed with a turn of the touch wheel(see fig. 4).

Normally, all the activated measurement values will be dis-played in the table, which will scroll as the measurements aremade in such a way that that the most recent values are visi-ble. Both the actions can be modified with the help of the tablemenu.

The menu for the table is always selectable via (View: Table)or from the table view itself by pressing .

If manual scrolling is selected from the table menu, scrolling ishandled via the touch wheel using and until , or OKare pressed to cancel the function.

5.7 Evaluations within the diagram

A diagram showing a plot of the values is displayed to the rightof the table and can easily be accessed by turning the touchwheel to the right (see fig. 4).

Normally, values of all quantities activated for measurementwill be shown on the diagram. This can, however, be modifiedwith the help of the diagram menu.

The diagram menu is always selectable via (View: Diagram)or from the diagram view itself by pressing .

The menu contains various evaluation functions which may beselected (e.g. zoom, line fitting, integrals). These are applied tothe currently selected region of the plotted curve.

By default, the selected region is the full length of the first(black) curve. This can be altered by selecting Range and thenselecting the desired curve.

After this range function has been selected from the diagrammenu, the start and end of the range can be selected via thetouch wheel using and and OK, either until both ends of

the range have been defined or until or have been clickedto cancel the action.

If more than one curve is to be displayed at once, a second y-axis will automatically be displayed if the display range of thesecond curve differs from that of the first. The colour of thescale divisions for that axis will match the colour of the curve towhich they belong.

Notes on evaluation functions

As long as no ranges have been selected, the zoom functionwill zoom into all of the y-axes but not the x-axes. You can onlyzoom in on the x-axes as well by selecting a range.

Multiple subsequent evaluations can be made without deletingany previous ones. The most recent result of any evaluationswill be displayed in the status bar at the bottom of the diagram.

5.8 Automatic switch-off

When it is not being powered from the plug-in power supply,Mobile-CASSY 2 turns off automatically if none of its controlshave been operated for the period of one hour, if no measure-ments have been made during the same period or if there hasbeen no USB connection in that time.

In order to save the battery, it will be disconnected when thevoltage it is supplying falls beneath a critical value.

5.9 Switching off

Normally, Mobile-CASSY 2 should always be switched off fromthe menu. If that menu is not accessible, because Mobile-CASSY 2 is no longer responding, then the unit can also beswitched off using the hardware. This means pressing the OKbutton for 3 seconds (only touching it is not enough).

When the device is switched off, the current set of measure-ments and the present settings are erased. Any sets of mea-surements which have been saved to the SD card are, ofcourse, retained.

6 Data logger

Once a set of measurements has been recorded, it can besaved via the menu (see fig. 3). The filename specified willbe displayed.

The file can either be saved to a USB memory stick with FATformatting or to the internal SD card to the Examples sub-fold-er (*.labm) or to the Data sub-folder (*.txt). It is only possibleto write to the internal SD card when the Mobile-CASSY unit isNOT connected to a computer.

If a Mobile-CASSY 2 is connected to a computer via USB, thenit is possible to read and write to the SD card from the comput-er.

If the file has been saved as *.labm, then besides the measure-ment data the file also contains all the settings and can be readby Mobile-CASSY 2 again. If the subdirectories exist for the ex-amples directory, these can be selected in the first level. Fur-thermore, using Mobile Edit (see section 12.2) an experimentinstruction sheet can be integrated.

If the file has been saved as *.txt, then it can be read usingmultiple commonplace programs. The simplest way is to dragand drop it onto CASSY Lab 2 (see section 12.11) while thatsoftware is running. Even the demo version of CASSY Lab 2 isequipped for this, meaning that no activation code is required.




Fig. 4: To the right of the displayed measurement, there may be other displays indicating any other quantities that are activated, as well as a tableof the measurements and, on the far right, a plot of those measurements. You can switch between the various displays by making a turningmotion on the touch wheel.

7 Charging the battery

The rechargeable battery is designed to allow a fully chargedMobile-CASSY system to be in storage for more than a yearbut still be ready for immediate use.

Battery consumption when in operation is heavily dependenton the kind of sensors being used. The remaining charge is in-dicated on the display.

Once the battery has been fully run down, it takes approximate-ly 10 hours to restore it to full charge.

8 Meaning of LEDs

The LEDs at the side indicate various operating states whichdepend on whether the Mobile-CASSY 2 unit is turned on oroff.

8.1 Mobile-CASSY turned off

Yellow: Mobile-CASSY is being charged

Green: Mobile-CASSY is fully charged but the power supply re-mains plugged in.

8.2 Mobile-CASSY turned on

Green: Displayed briefly when switching on or off.

Flashing green: During the course of an actual measurement(see section 5.4) or a firmware update (see section 13).

Yellow: The internal SD card or an external USB stick is beingaccessed.

9 WiFi settings

In order for Mobile-CASSY to be found more easily in WiFi, ithas a name. The standard name for this is "MC2-XXX", where"XXX" is replaced by the last three numbers of the serial num-ber. This name can be modified with Mobile Config (see sec-tion 12.1) and is used by Mobile-CASSY e.g. as the name ofthe access point, as the DHCP host name and as the name inthe apps (see section 12).

Mobile-CASSY WiFi (524 005W) supports three different WiFimodes:

• Disabled to save power or when used in an aircraft. Ifonly a few Mobile-CASSYs have the WiFi connectionswitched on, connection to CASSY Lab 2 is more clearlydiscernible.

• Access point as the standard default setting. A differentname for the access point and a password can be en-tered using Mobile Config (see section 12.1). The threeoperating modes can be distinguished between by thedisplayed symbol:

: No connection established to access point.: A device is connected.: An app is connected (see section 12).

Connecting to a Mobile-CASSY access point is particu-larly easy: → Show QR code → AP data. However, aterminal then always has connection to exactly one Mo-bile-CASSY and usually no more Internet access.

• Client for connection to a router. The access data ofthe router (SSID and password) can be entered usingMobile Config (see section 12.1). The three operatingmodes can be distinguished between by the displayedsymbol:

: The connection to the router is being established orhas failed. If a connection to the router has not been sig-nalled after 30 seconds, check the SSID and passwordof the router.

: The connection to the router has been established.The better the reception is, the more bars displayed.

: An app is connected (see section 12). The better thereception is, the more bars are displayed.

For security reasons, the Mobile-CASSY will not revealthe connection data to the router via a QR code.

9.1 Server

The Mobile-CASSY 2 WiFi runs several servers, some of whichsupport multiple simultaneous connections.

Note: These servers provide unencrypted connections, which,for security reasons, should therefore only be used within a lo-cal network.

TCP server

A TCP client, such as the CASSY app (see section 12.10)and CASSY Lab (see section 12.11), control the measurementrecording of a Mobile-CASSY and display the results. Only oneconnection is possible simultaneously, and only if there is noUSB connection.

HTTP server

For the delivery of the Mobile-CASSY Web App (see sec-tion 12.4) to a browser, e.g., on a smartphone. In this case, theMobile-CASSY controls the measurement itself.




WebSocket server

For the distribution of the measured values of the Mobile-CASSY to up to three WebSocket clients. A WebSocket clientis often embedded in a web page, such as Mobile Controlor the Mobile-CASSY Web App (see sections 12.3 and 12.4).Our Lab Docs of the Science Lab Student Experimental Lit-erature also include WebSocket clients that allow up to threestudents to collaborate on a Mobile-CASSY experiment, usingtheir tablets (see sections 12.5 and 12.6).

To simplify a WebSocket connection, a PIN that can be foundto the left of the or , which can be entered instead of theIP address or the CASSY name in the address field of a LabDoc. This PIN can be modified or disabled in Mobile Config(see section 12.1).

To keep track of the number of WebSocket connections, theyare counted to the right of the green or . It counts all con-nections to the Mobile-CASSY Web App, to Mobile Control,and to a Lab Doc. When all three connections are established,the display of the PIN disappears since no further connectionis possible.

VNC server

A VNC client connected to the VNC server transmits the screencontent and enables remote control of the Mobile-CASSY (seesection 12.7). Only one VNC client can be used at a time.

9.2 MAC address

For some networks, the MAC address must be specified beforeMobile-CASSY can connect to the network. There are differentways to obtain the MAC address of a Mobile-CASSY:

• Mobile Config (see section 12.1) displays the MAC ad-dress in the status line when the Mobile-CASSY is con-nected via USB.

• The Mobile-CASSY Web App (see section 12.4) showsthe MAC address in the System menu.

• The Bonjour Discovery app on a smartphone or tabletdisplays the MAC addresses of all Mobile-CASSYs onthe same network under the HTTP services in the form,CASSY-name-XXXXXXXXXXXXX. This is useful for de-termining the MAC addresses of several Mobile-CASSYs at the same time.

10 Expert mode and additional settings

By default, the operation of the menus is stressed and the dis-play optimised for easy introduction to the Mobile-CASSY 2system.

These and other settings can be modified in the menu or canbe temporarily or permanently configured using Mobile Config(see section 12.1) on the computer.

10.1 Expert mode

Users who have had more practice can switch to Expert modevia → Advanced Settings. This activates the followingfunctions:

• No security prompts when starting or stopping measure-ments with .

• No security prompt when turning off Mobile-CASSY fromthe menu.

• Functions selected in the main menu can be moved di-rectly from side to side using and even when themenu is expanded.

• and can also go beyond the ends of the main menuback to the start or to the end.

• Context menus are also provided from the measurementvalue display in order to afford quicker access to the con-figuration menus via .

• Displays and graphs can be displayed in a larger size byreducing the size of the main menu.

10.2 Activate screenshots

If screenshots are activated, these can be made by touchingthe OK button for 2 seconds.

A screenshot can either be saved to a USB memory stick withFAT formatting or to the Screenshots sub-folder on the internalSD card. It is only possible to write to the internal SD card whenthe Mobile-CASSY unit is NOT connected to a computer.

A successful screenshot is indicated by an audible signal iden-tical to a normal key tone. An unsuccessful screenshot (e.g.when the internal SD card is currently being accessed by acomputer) is indicated by a higher pitched and longer tone.

If a Mobile-CASSY 2 unit is connected to a computer via USB,then it is possible to read and write to the SD card from thecomputer.

The saved bitmap file (*.bmp) can be read using multiple com-monplace programs.

10.3 Diagram available

If the diagram is disabled, then with the touch wheel you areonly able to toggle to the table. Depending on what the objectof the lesson is, work on the diagram can be postponed until alater point in time.

10.4 Clock visible

If the clock display is disabled, then there is more space forevaluation results in the status bar.

10.5 Additional settings

There are some settings which cannot be set using the menuof Mobile-CASSY 2. This includes a welcome screen duringswitch-on, a preset subdirectory for experiment examples, thename of the Mobile-CASSY, the WiFi configuration and defaultexperiments.

Furthermore many individual menu items of the Mobile-CASSYcan be disabled so that these menu items can no longer be se-lected.

These settings can be carried out with Mobile Config (see sec-tion 12.1).

11 Cleaning/maintenance and the touch wheel

Keep the touch wheel clean and give it a proper clean if it be-comes less precise in its operation. This can be done using adry microfibre cloth or, in the case of troublesome dirt, by us-ing a small amount of cleaning alcohol. The sensitivity of thetouch wheel can be adjusted under → Advanced Settings→ Touch. Higher values increase the sensitivity but also in-crease the likelihood of unwanted triggering.

Do not store Mobile-CASSY 2 modules with batteries that areflat.

Rechargeable batteries should be disposed of at specialisedbattery disposal points and replaced by standard NiMH




Fig. 5: Mobile Config configures a Mobile-CASSY by editing its hidden configuration file MOBILE.CFG.

rechargeable batteries (AA, 2000 mAh) possessing low valuesfor self-discharge.

12 Apps for Mobile-CASSY 2

For those who are not yet satisfied by Mobile-CASSY 2's fea-tures, these can be supplemented using apps.

12.1 Mobile Config (contained in scope of delivery)

Mobile Config is a tool used by the instructor or the system ad-ministrator to configure Mobile-CASSY or to restrict its func-tionality (see fig. 5).

The configuration is stored in the hidden configuration file MO-BILE.CFG on Mobile-CASSY.

A welcome screen, the name of the Mobile-CASSY, its WiFi ac-cess data, automatic switchover to daylight savings time and adefault experiment can be defined.

In addition to the WiFi access information, this is where youcan change the PIN, which is displayed to the left of the green

or and simplifies the connection to the interactive LabDocs. For this purpose, this PIN is transmitted anonymously toour discovery service, along with the local IP address, where itis stored for a maximum of one day. If this is not desired, thePIN can be disabled, thus disabling this service in Mobile Con-fig.

It is also possible to enter values for many existing menu itemsor to disable these menu items altogether.

Particularly helpful is the automatic configuration of severalMobile-CASSYs with the same configuration file, if the first op-tion Copy changed configuration to CASSY automaticallyis selected and the configuration file is copied to a USB stick.Then all you need to do is briefly insert this USB stick for theconfiguration of a Mobile-CASSY.

In the default operating state of the Mobile-CASSY 2, Mobile-Config.exe is located on its SD card and can be started direct-

ly from there without any installation as soon as the Mobile-CASSY is connected via USB to a Windows computer.

The user interface of Mobile Config is only available in the Ger-man and English language. The help texts provide additionalinformation on how to use Mobile Config.

Download: https://www.leybold-shop.com/524005

12.2 Mobile Edit (contained in scope of delivery)

Mobile Edit is a tool used by the instructor or author to add ex-periment descriptions in one or more languages to the mea-surement files of Mobile-CASSY (see fig. 6).

In addition to the experiment descriptions, an image and thename can be specified for each language, under which the ex-periment example should be displayed in the file selection treein Mobile-CASSY.

In the default operating state of the Mobile-CASSY 2, Mo-bileEdit.exe is located on its SD card and be started directlyfrom there without any installation as soon as the Mobile-CASSY is connected via USB to a Windows computer.

The user interface of Mobile Edit is only available in the Ger-man and English language. The help texts provide additionalinformation on how to use Mobile Edit.


12.3 Mobile Control (contained in scope of delivery)

Mobile Control (only Mobile-CASSY 2 WiFi) is a tool for teach-ers who can use it to survey the measurement data of all stu-dent groups (see fig. 7). For this purpose, a WebSocket con-nection to the selected Mobile-CASSYs is established, and thisthe group is also displayed by a small digit to the right of thegreen . In addition, Mobile Transfer can transfer control set-tings to all or individual student groups in the form of a *.labmfile, using the menu or drag&drop.




https://www.leybold-shop.com/524005


Fig. 6: Mobile Edit supplements the measurement data by providing descriptions.

Since Mobile Control is a tool for multiple Mobile-CASSYs, itsuse only makes sense in a router infrastructure. However, thisrouter does not need to have internet access.

The user interface of Mobile Control is only available in theGerman and English language. The help texts provide addition-al information on how to use Mobile Control.


12.4 Mobile-CASSY Web App (contained in scope ofdelivery)

The Mobile-CASSY Web App is a website which is deliveredby Mobile-CASSY 2 WiFi (see fig. 8). The URL of the web appcan be reached via → Show QR code. The Web App isuseful for having measured values, tables, diagrams, and eval-uations that are displayed by Mobile-CASSY displayed by oth-er devices on the same network as well. The Mobile-CASSYWeb App is only intended for display, and not for controlling therecording of measured values.

Fig. 7: Mobile Control gives a clear summary of the measurement data of several Mobile-CASSYs in the network and can transfer settings to thevarious Mobile-CASSYs.





Fig. 8: In addition, the Mobile-CASSY Web App displays the mea-surement data, tables, diagrams, and evaluations of a Mo-bile-CASSY in up to three browsers.

If the Mobile-CASSY does not yet show a Mobile-CASSY WebApp, a firmware update followed by a WiFi update (see sec-tion 13) is required.

12.5 LeyLab

LeyLab is an online portal for the management of device collec-tions and experiments, including the associated literature. In-teractive and editable Science Lab Student Experiment Instruc-tions (Lab Docs) are available there as well. They are an idealcomplement to a Mobile-CASSY 2 WIFI class kit. Each LeyLabgenerated QR code for the Lab Docs is valid for one week andcan be used by students with Internet access.

Registration: https://www.leylab.de

12.6 Document Center (free of charge)

There is a literature package with experiment instructions forthe Mobile-CASSY 2 in the Document Center. The experimentfiles can simply be copied from the Document Center into aMobile-CASSY and kept up-to-date (see fig. 9).

In addition, interactive and editable Science Lab Student Ex-periment Instructions (Lab Docs) are available as a fee-based

Fig. 10: A Mobile-CASSY screen in the window. A VNC Viewer is ide-al for presentations on a projector.

Literature Pack for the Document Center, allowing you to ac-cess Lab Docs without Internet access.

Download: https://www.ld-didactic.com/dc

12.7 VNC Viewer (free of charge)

Mobile-CASSY 2 WiFi has an integrated VNC server. For easyuse we recommend the VNC Viewer from RealVNC, which isavailable free of charge for Windows, Linux, OS X, Android andiOS (see fig. 10).

The respective name of the Mobile-CASSY is to be entered asthe VNC server, just as it is specified in menu. Any blankspaces need to be replaced by hyphens. Alternatively, the IPaddress indicated in the menu can be entered instead.

Alternatively operation of the Mobile-CASSY can also be car-ried out using the VNC Viewer. There is of course no touchwheel available for operation on the VNC Viewer. Insteadequivalent mouse actions can be used (click and drag).

Fig. 9: The Document Center provides finished experiment examples and checks whether existing examples need updating.




https://www.leylab.de/

https://www.ld-didactic.com/dc

Fig. 11: Mobile-CASSY 2 can also be sensibly used with smart-phones and tablets.

Important note

The default settings of the VNC Viewer have to be modified.

VNC Viewer: Display all available colours (maximum compres-sion), as otherwise the colours are displayed incorrectly.

VNC Viewer app: Switch picture quality from automatic to highas otherwise no connection is established.

12.8 Multimeter (free of charge)

The Android app from the Playstore simulates a pointer instru-ment and supports the numerous sensors for voltage, amper-age, force and magnetic fields.

The app also supports other CASSYs via USB or Bluetooth.

12.9 Oscilloscope (free of charge)

The Android app from the Playstore simulates a dual oscillo-scope and supports the numerous sensors for voltage, amper-age, force and magnetic fields.

The App also supports other CASSYs via USB or Bluetooth.

12.10 CASSY App (free of charge)

The CASSY App is available for all conventional operating sys-tems (Android, iOS and Windows). It reproduces the functionalenvironment of the Mobile-CASSY on a tablet with the addition-al possibility of being able to export measurement values anddiagrams to other apps or to the cloud.

12.11 CASSY Lab 2 (524 220)

Mobile-CASSY 2 is fully supported by CASSY Lab 2. If onlyMobile-CASSY files (see section 6) are to be read, the demoversion without activation code suffices.

Download:https://www.ld-didactic.com/software/cassylab2_en.msi

13 Firmware updates

It is advisable to update the Mobile-CASSY firmware from timeto time. This is essential if a sensor is to be used which was notin existence at the time the Mobile-CASSY unit was manufac-tured.

This becomes apparent in that the quantity to be measured bythe connected sensor remains unknown so that the settings forthe quantity thus indicate that a firmware update is required.

There are various ways by which an update can be carried out:

• Download the firmware file FIRMWARE.LD from the in-ternet, copy it to the Mobile-CASSY SD card, then turnthe unit off and back on again. When you have switchedit back on, wait for the update procedure to be carriedout, i.e. while the green LED is flashing.Download: https://www.leybold-shop.com/524005

• Download the firmware file FIRMWARE.LD from the in-ternet and copy it to the root directory of a FAT-formattedUSB stick. Plug the USB stick into the Mobile-CASSYunit, and take it out again once the update procedurehas started (i.e. when the green LED is flashing). Thismethod is particularly useful if you need to update thewhole set of Mobile-CASSY 2 units for a class.Download: https://www.leybold-shop.com/524005

• Download the current version of CASSY Lab 2 fromthe internet and install it. Connect the Mobile-CASSYto a computer and carry out the firmware update fromCASSY Lab (this requires a licence for CASSY Lab 2).Download:https://www.ld-didactic.com/software/cassylab2_en.msi

13.1 WiFi-Update

The WiFi module of the Mobile-CASSY includes firmware andthe Mobile-CASSY Web App (see section 12.4). Updating thisfirmware is only possible if Mobile-CASSY is connected to theInternet. If a WiFi update is available, it can be applied via→ WiFi update. In order to offer this option, Mobile-CASSYautomatically downloads the version number of the currentfirmware from the Internet at each start-up and compares itwith the installed version.




https://www.ld-didactic.com/software/cassylab2_en.msi



https://www.ld-didactic.com/software/cassylab2_en.msi

14 Examples

Fully prepared measurement examples are available as litera-ture packages in the Document Center (see section 12.6).

Fig. 12: Charging of a capacitor (C = 100 µF, R = 100 Ω) with simulta-neous measurement of U (voltage - black), I (current - red), P(power - blue) and E (energy - violet).Measuring ranges U = 10 V (zero point left), I = 100 mA (zeropoint left), measuring time 100 ms triggering from I.

Fig. 13: Damped oscillation circuit (C = 1 µF, STE coil with 1000 turns)with simultaneous measurement of U (voltage - black), I (cur-rent - red) and P (power - blue).Measuring ranges U = 10 V (zero point centre), I = 100 mA(zero point centre), measuring time 5 ms triggering from U.

Fig. 14: Example of calibration of a measurement for a pH electrodeand two buffer solutions.

Fig. 15: Calibration of a pH electrode with the help of two targetpoints. Each of the target points is to be adjusted usingand or by turning the touch wheel once the pH electrodehas been immersed in the buffer solution. When it is reached,confirm with OK. Only then will the tick appear and the cali-bration will become active.

Fig. 16: If no quantity is activated for measurement, then the unit canbe used as a simple stopwatch.




15 Brief instructions

The brief introductory instructions shown here are included withevery Mobile-CASSY 2 unit and are intended to be used by

students. If any of these instruction sheets should get lost, theycan be reprinted from the example reproduced below.




524005 instruction sheet - home - ld didactic

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