Count/Tachometer adapter
Contents
1. Count Tachometer adapter Product No 3296 Ranges Counts 0 to 1 000 count Counts 0 to 60 000 count Counts per second 0 00 to 200 00 cps Revolutions per second 0 00 to 200 00 rev s Revolutions per minute 0 to 12 000 rom Wind speed m s 0 0 to 50 0 m s Wind speed mph 0 0 to 110 0 mph Rain Gauge 0 to 2 500 mm Spoked Pulley m s 0 00 to 5 00 m s Spoked Pulley mph 0 00 to 10 00 mph Spoked Pulley m 0 000 to 50 0 m 4 Ry DATA HARVEST AAA 9 v Data Harvest Group Ltd 1 Eden Court Leighton Buzzard Beds LU7 4FY Tel 01525 373666 Fax 01525 851638 e mail sales data harvest co uk www data harvest co uk DS 104 No 1 Data Harvest Freely photocopiable for use within the purchasers establishment Smart Count Tachometer adapter jaliga a Die 11eg soe ogee ope est E E Senet E EA EEE AE E npsactec E A E E cee 2 CONNEC CUA rinder e E EE E E E E boenetad sbensee ine 3 FROIN S paai E E O E E A T E 3 Altering the currently selected range ccccseeccceeeeeceeeeseeeeeseeeeeseueesaeeeeseeeeseaeeseneeesaees 3 information ADOUT ranges sssisrinrsrnilinse anini nanai lania da e aa AAN a aiaia 4 1 amp 2 Cumulative COUN esisiini oniinn naaa aaa aaa aaa aa 4 Gis Counts per secodre a rE E E EER E E a ad 4 4 Revolutions per second cece ceccceeccceeeeceeeeseeeseeeeseceeaeeeeeeeseueeseeeeseeesseeeseueeseeesueesaees 4 5 Revolutions per minute cece eecccee2. or without Spoked pulley Product No 3177 Crocodile clip lead set Product No 3260 Push button reaction switch Product No 3261 Timing mats set Product No 3255 2 A jack socket which can be used with a switch type device connected via a 3 5 mm jack plug e g an Anemometer Product No 3297 Rain Gauge Product No 3298 Foot switch Product No 3299 or contact magnetic switch push to make switch pressure mats etc Press the button on the Adapter to reset a count to zero The Adapter will start to count a soon as it detects a pulse The red LED will give a visual indication of the state of the device attached it will light while the condition is ON low Smart Count Tachometer adapter Connecting C SiS 4s A i mm ahi 5 Light gate connected via the mini din socket Switch connected via the jack socket Connect the device to be used to either the mini din or jack socket as appropriate Push one end of the sensor cable supplied with the EASYSENSE unit into the hooded socket on the Adapter Connect the other end of the sensor cable to an input socket on the EASYSENSE unit The EASYSENSE unit will detect that the Count Tachometer is connected and display values using the currently selected range The Count Tachometer will reset its count to zero a When you press the zero button b Automatically when you connect the Adapter to an input on a logger c Automatically when a range is
3. 0 28 March 2009 10 46 18 Time mmi ss The effect of exercise on Heart rate The effect of exercise on Heart rate of exercise on Heart rate Ranges dedicated to accessories 6 Wind speed in m s 0 0 to 50 0 m s 7 Wind speed in mph 0 0 to 110 0 mph These two ranges are calibrated for the 3297 Anemometer to record wind speed in either m s or mph Connect one end of the jack lead supplied with the Anemometer to the jack socket at the base of the Anemometer and the other end to the jack socket on the side of the Adapter Investigations e Weather patterns Notes Wind speed must be at least 1 m s 2 mph to achieve start up speed Maximum wind speed is 50 m s or 110 mph Smart eens Count Tachometer adapter The Anemometer uses a double contact reed switch so counts twice for each complete rotation Wind speed is calculated by using the rate of rotation of the wind cups m s Hz x 0 786 0 948 mph Hz x 1 758 2 121 When recording over a long duration on battery power some EASYSENSE loggers e g Q Advanced sleep between samples The Count Tachometer will continue to update its readings while the logger is in sleep mode and return the current speed at the time the sample is taken The Count Tachometer takes its power direct from the EASYSENSE unit It will use power while connected even when it is not taking any samples If recording for a long period we recommend attaching the logge
4. Q Advanced sleep between samples The Count Tachometer adapter will continue to update its readings while the logger is in sleep mode and return the current speed at the time the sample is taken The Count Tachometer takes its power direct from the EASYSENSE unit It will use power while connected even when it is not taking any samples If recording for a long period we recommend attaching the logger to its mains power supply 9 Speed using the Spoked pulley in m s 0 00 to 5 00 m s 10 Speed using the Spoked pulley in mph 0 00 to 10 00 mph 11 Distance using the Spoked pulley in m 0 000 to 50 000 m These ranges are calibrated for use with the 3177 Spoked pulley attached to a Light Gate As the Pulley rotates its spokes will block the infrared beam of a Light Gate Smart Count Tachometer adapter The calibration for Spoked pulley ranges is calculated by measuring the circumference of the pulley wheel using 1 5 mm diameter string run in the groove of the pulley and dividing the total by 10 10 spokes For accurate results use 1 5 mm diameter thread or rod resting in the pulley wheel groove Note As the spokes on the pulley can easily interrupt the Light Gates beam wait until all is ready before resetting to zero and then begin logging Investigations e Record the speed or distance travelled by a Dynamics cart e Record the speed or distance travelled by a road bicycle with the Spoked pulley in contact with the bicycl
5. ceceeeeeeeeeeeeeaeeeseeeeseeeeseeeeseeesseeesaueeseeeseueesaueeseeeeaes 4 6 amp 7 Wind speed in M S amp Mph sannnnnnnnonnnnnnnnnnnnennnnrnnnnrnsnrnsnrnnnnrrsnrrnnrrnnnrrnrnnnnrrsnrrsnrrnne 5 Be ANN LS A E E bcsulbw haan diel ond leak menatadices 6 9 amp 10 Speed using the Spoked pulley in M S amp MPh cece ceeececeeececaeeeeseeeeeeeeeeeees 6 11 Distance using the Spoked pulley iN M ccceeccceeeececeeeeeeeseeeeeeeeeseeeseeeeeeaeeeesaaees 6 Practical WATONIMVAU OM ssim o a cede node dared R A EE E 8 IAAI A tse et A A A E nied AEE 9 Introduction On Off indicator Sensor cable socket for connection to an Zero reset button a ae se y EASYSENSE logger Mini din socket for Smart Q digital sensor 3 5 mm jack socket The Count Tachometer adapter counts electrical pulses the number of times a change in a digital signal occurs What it counts will depend on the device attached to the Adapter e g attach a magnet and reed switch to a bicycle wheel and measure its speed by counting the revolutions The Count Tachometer contains the calibration for 11 different ranges making this a very versatile sensor for a wide range of investigations e g recording wind speed rain fall revolutions per minute counts per second and more There are two sockets for connecting devices to the Count Tachometer 1 A mini din socket which will accept any Data Harvest Smart Q digital sensor e g Light gate Product No 3250 with
6. changed The Count Tachometer takes its power direct from the EASYSENSE unit It will use power while connected even when it is not taking any samples Disconnect the Adapter when not in use Ranges The Count Tachometer has eleven ranges Set Sensor Range X Altering the currently selected range Connect the Count Tachometer to the EASYSENSE unit Start the EASYSENSE program and select one of the Selb Pande logging modes from the Home screen Select Sensor Config from the Settings menu Select the Count Tachometer from the list and click on the Sensor 1 Change Range button Counts 0 60000 The current range will be highlighted Select the required Countess range and click on OK nae Close Sensor Config Click on New Qana then Finish for Wind ms the change in range to be detected Renee mph The range setting will be retained until changed by the user With some EASYSENSE units it is possible to change the range from the unit Please refer to the EASYSENSE unit s user manual Suau LAIRI Count Tachometer adapter Information about ranges RANGES 1 Cumulative count 0 to 1 000 2 Cumulative count 0 to 60 000 These ranges count the number of times the Count Tachometer detects the change in a switch from OFF to ON The reset button on the Count Tachometer can be used to reset a count to zero A constant can be applied to a count to give another unit For example to convert count data to distanc
7. e travelled 3 Post log Function Selection Attach a switch to a wheel that is ON each time there is a complete revolution of the Domaca 0 wheel Use Tools Post log Function naka Preset General Multiply by a constant Onn Caml E i Alter the name to Distance the units to m cama and enter the number to multiply i e the Ue icon toa eaeh tye eb oe distance between each count one o revolution of this road bike 2 0 metres Fnth Caa The larger range O to 60 000 can be used to improve the accuracy of low speed counting For example attach 4 triggers equally spaced on the wheel to attenuate a switch it will then be ON each time a of the wheel passes by i e every 0 5 m If the count reaches the maximum value it will stop counting Investigations e Use with switches e g push to make proximity magnetic pressure mats or a foot switch to count a total number of events e Count the number of people entering a room Use a trigger as a start condition to begin recording e Use as a tally counter with a push button switch e g to count the number of cells seen in a square 3 Counts per second 0 00 to 200 00 cps 200 Hz 4 Revolutions per second 0 00 to 200 00 rev s 5 Revolutions per minute 0 to 12 000 rpm These ranges use the time elapsed between ON conditions to calculate the rate per second or minute A rolling average filter is applied to the data over 5 readings The revolutions rang
8. e wheel e Newton s 2 law using Atwood s machine or a cart on a horizontal track Newton s 2 law using Atwood s machine 1 Make sure the S Pulley in m s range is selected and connect the Count Tachometer to a Light gate Spoked pulley 2 Select Graph from the Home screen a total time span of 2 seconds 20 ms interval and a trigger of rises above 0 10 m s Select Overlay 3 From the Tools menu select Pre log Function Preset function Motion Acceleration from Velocity data Next Select S Pulley as the velocity channel Next Alter the units to m s 4 Support the weights after a second the Count Tachometer will auto reset to zero click on Start to begin logging and release the weights 5 Transfer a weight from one side to the other and repeat 6 Select the sloped part of the graphs Edit Use Selection Use Smoothing Tools menu to smooth the Acceleration graphs Use Show Statistics Analysis menu to read off the mean value for each acceleration graph Use Sensor Settings Options icon or right click to left of graph to alter the axis limits to a suitable value S Pury caus leew Aiii ata mes G Pukey riua rns Aicikiaon brir 5 Pukey iat paal Acioa eres Aitik bar Sue 20 11 5810 Tira mit Sma SE ree Count Tachometer adapter Practical information e The fastest speed that data can be captured is 50 Hz 20 ms If an intersample time of less than 20 milliseconds is
9. es can be used to measure the number of full rotations around a fixed axis e g speed of a wheel shaft or disc Investigations e Muscle fatigue using a Light gate e Study circular motion e g shaft rotation of a waterwheel e Electrical energy vs shaft soeed e Use a home made Anemometer to measure wind speed in revolutions per second rev s To convert revolutions per second values to velocity first work out the circumference in meters of the circle made by your anemometers rotating cups Multiply the wind speed in Smart Count Tachometer adapter rev s by the circumference of the circle and you will have an approximation of the velocity of at which your anemometer spins in meters per second Tools gt Post log Function gt Formula ax bx c Next B select Rev s as channel X Next gt rename the channel e g Anemometer and units as m s gt make a 0 to delete the ax part of the equation make c 1 so the equation is in effect bx make b the circumference of the circle Finish e Monitoring the speed of an exercise bike Use an exercise bike with a magnet attached to one of the bike spokes which triggers a reed switch Connect the reed switch to the Adapter by either using a Smart Q Crocodile clip or wire the switch to a lead ending with a 3 5 mm jack plug Revs per min rpm creasing exercise exercise 220 200 180 Resting Recovery 160 Polar Heart rate sensor v Count Tachometer 05 02
10. ically when you connect the Adapter to an input on a logger c Automatically when a range is changed e There is not enough resolution on the Spoked pulley encoder wheel to make this sensor suitable for recording the velocity of a pendulum Warranty All Data Harvest Sensors are warranted to be free from defects in materials and workmanship for a period of 12 months from the date of purchase provided they have been used in accordance with any instructions under normal laboratory conditions This warranty does not apply if the Sensor has been damaged by accident or misuse In the event of a fault developing within the 12 month period the Sensor must be returned to Data Harvest for repair or replacement at no expense to the user other than postal charges Note Data Harvest products are designed for educational use and are not intended for use in industrial medical or commercial applications WEEE Waste Electrical and Electronic Equipment Legislation Data Harvest Group Ltd are fully compliant with WEEE legislation and are pleased to provide a disposal service for any of our products when their life expires Simply return them to us clearly identified as life expired and we will dispose of them for you
11. r to its mains power supply 8 Rain gauge 0 to 2 500 mm This range is calibrated for use with the 3298 Rain Gauge a tipping bucket type rain gauge As rain falls it lands in the funnel shaped top which leads the water down into a bucket self emptying spoon The spoon is balanced on a pivot and held by a magnet that is in contact with a switch The magnet exerts just enough tension so it will release its hold when the spoon is full causing the bucket to tip empty and return to its normal position in one quick movement When the bucket tips it triggers the switch from normally closed ON to open OFF Total rainfall is measured by counting how many times the bucket tips Connect the jack lead from the Rain gauge to the jack socket on the side of the Adapter and then connect the Adapter to the logger The LED will light when a count is detected Investigations e Weather patterns Notes The Rain gauge range reacts to switch changes in a different way to the other ranges As the rain gauges switch is normally closed ON it looks for a change from closed to open OFF If this range is selected without the rain gauge attached the red LED will remain lit until it is connected The act of plugging in the Rain gauge after the Adapter has been connected may add 1 to the reading press the button on the Adapter to reset to zero When recording over a long duration on battery power some EASYSENSE loggers e g
12. selected then the values obtained will either default to the lowest reading or the set up will be rejected by the logger software e Light Gate The count will increase by 1 each time the infrared beam is blocked ON red LED lit It will ignore the change when the infrared beam is unblocked OFF red LED off ON Blocked Count 1 Unblocked OFF OFF Push button reaction switch The count will increase by 1 when the button is pressed Pressure mat The count will increase by 1 when someone stands on the mat Crocodile clips The count will increase by 1 each time the circuit in which the crocodile clips are connected is completed e There is an input voltage limit of a minimum of 0 V to a maximum of 5 V for devices that can be attached to the Count Tachometer e If you wish to assemble your own switches the typical connections to a 3 5 mm plug are B B oe Y P v sme gt a E _ o A A A STEREO Jack plug MONO Jack plug A C Signal shorted together A Signal B Power pulled up to 5 V via 2k2 resistor B Power pulled up to 5 V via 2k2 resistor e Switches often don t make and break cleanly when switched they actually open and close their contacts several times before settling down to new position This effect is commonly called switch bounce and can last from as little as a fraction of a millisecond ms to as long as 50 ms To reduce the effect of bounce a time delay has been implemented so that contact bo
13. unce has time to settle before being counted i e 3 ms for the Cumulative count ranges 1 ms for Counts per second and Revolutions per second or minute 2 ms for the Rain gauge Even with this delay there will still be some switches that aren t suitable for counting e g a tilt switch It is best to test your switch and setup before beginning a count e When recording over a long duration on battery power some EASYSENSE loggers e g Q Advanced sleep between samples The Count Tachometer adapter will continue to update its readings while the logger is in sleep mode and return the current value at the time the sample is taken e The Count Tachometer adapter takes its power direct from the EASYSENSE unit It will use power even when it is not taking any samples Disconnect the Adapter when not in use to conserve power If recording for a long period we recommend attaching the EASYSENSE unit to its mains power supply e The effect of signal errors will increase as the length of an extension cable increases until eventually the signal will degrade this effect is reduced by using good quality cable The Anemometer and Rain Gauge has been tested with a 10 metre 3 5 mm male female jack extension cable 20 metres of cable total without degradation of the signal Sma sree Count Tachometer adapter e The Count Tachometer adapter will reset its count to zero a When you press the zero button It starts counting when you release the button b Automat
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