CMA ML32f User guide

Brand: CMA

Model: ML32f

Type: User guide

FORCESENSORML32F

USER’SGUIDE



CENTRE FOR MICROCOMPUTER APPLICATIONS

http://www.cma-science.nl

2|ML32fForceSensorUser’sGuide

Shortdescription

TheForcesensorML32Fisageneral‐purposedeviceformeasuringforces intherange

between‐80 and 80 N. The sensor can be used as a replacement for a hand‐held

springscale,canbemountedonaringstandoronadynamicscarttostudycollisions.

Itmeasures

bothpullsandpushes.

Theforcesensorusesstraingaugetechnologytomeasureforce,basedonthebending

of a beam. A maximal fo rce of 100 N can be applied to the sensor, for forces above

100Nthesensorcanbedamagedpermanently.

Severalaccessoriesareincludedwiththe

Forcesensor:

 abumpertouseforcollisionexperiments,ortomeasurepushingforces,

 athumbscrewtomountthesensoronaringstandard,

 ahooktousetomeasurepullingforces,

 autilityhandletomountthesensortovariousclamps.



TheForcesensorcanbeholdbyhandormountedonaringstandasshownbelow.



ML32fForceSensorUser’sGuide |3

The Force sensor is an I2C digital sensor, which gives calibrated values of the

measured quantity. This sensor can only be connected to special interfaces that

supportI2Cdigitalsensorslike theCMAMoLabinterface.Thesensorcableneededto

connectthe sensortoan interfaceisnotsuppliedwiththe

sensor(sensor cablesare

suppliedwithinterfaces).

Sensorspecifications

For sampling rates up 1 kHz (1000 samples per second) the Force sensor works as a

digital sensor and converts the measured force value to a digital value via 14‐bit

analog‐to‐digital conversion. For sampling rates above 1 kHz the sensor works as an

analog sensor.The  analog signal

 generated bythe sensor (on its ADC pin) is read by

theconnectedinterfaceandisconvertedtoadigitalvaluebythe12‐bitADconverter

on the interface. The maximum sampling rate of  the sensor is 100 kHz (samples per

second).

Collectingdata

ThisForcesensorworksonlywithspecificinte rfaces.Thesensorwillbeautomatically

detected when connected to such  an interface. For detailed information about

measurementswithsensorsconsulttheUserManualsoftheinterfaceandtheCoach

6software.

Calibration

The Force  sensor is supplied with fac tory  calibration in

newtons(N). TheCoach6program allowsshiftingthe pre‐

defined calibration or creating a new two‐points linear

calibrationif  needed.Theuser calibrationisstoredin non‐

volatileusersensormemory. 

UsetheSettozerooptioninCoach6

toadjustthezero

pointofthesensor.Theseoptionsarealsousefultoadjust

thezerolevelwhensomethingisattachedtothesensor,

forexampleinexperimentstostudyoscillationsofaspring

attachedtothesensor.

Suggestedexperiments

ThisForcesensorcanbeusedfor:

 Measuringofforcesandimpulseduringcollisions.

 Studyingsimpleharmonicmotion.

 Measuringofcentripetalorfrictionalforces.

 StudyingHook'slaw.

 StudyingNewton'ssecondlaw.

4|ML32fForceSensorUser’sGuide

TechnicalSpecifications



Sensorkind

Upto1000Hz‐digital

(on‐sensoranalogtodigitalconversion)

(14‐bitsresolution,communicationviaI2C)

Above1000Hz‐analog

(on‐interfaceanalogtodigitalconversion)

Measuringrange ‐80..80N

Storedcalibrationrange:‐98..98N

Resolution Typical0.012N(14‐bitdigitalmode)

Typical0.048N(12‐bitanalogmode)

Accuracy Typical±0.5%offullscaleat25°C‐digital(<1000Hz)

Maximumforce

100 N

(Forforcesabovethisvaluethesensorcanbedamaged

permanently.)

Currentconsumption

Typical,6.5mAat25°C

Maximalsamplingrate

100kHz

Sensordimensions

Housing:74 x 21 x 75mm

Lengthofthumbscrew:39mm

Lengthofhook:28mm

Connection 5‐pinsminijackplug

Warranty:

The Force sensor ML32f is warranted to be free from defects in materials and

workmanshipfor a periodof12monthsfromthedateofpurchaseprovidedthatithas

been used under normal laboratory conditions. This warranty does not apply if the

sensorhasbeendamagedbyaccidentormisuse.





Note:Thisproductistobeusedforeducationalpurposesonly.Itisnotappropriatefor

industrial,medical,research,orcommercialapplications.    

Rev. 17/11/2011

CMA ML32f User guide

CMA ML32f User guide

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