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EASY

SENSE V-Log Reference Manual 

 

 DO248 (5) 

 

5 

 Data Harvest Group Ltd, 2014 

 

Plug the Smart Q sensors into the shaped input sockets on the top of the logger using the leads supplied 
with the logger. When a sensor is connected it will automatically be detected and displayed on the LCD 
display. 

Sensor inputs 1 and 2 are dual labelled as A and B. These inputs are for Timing operations when digital 
sensors must be connected to either input 1:A or input 1:A and 2:B. 

V-

Log 8’s built-in sensors  

The V-Log 8 has 4 built-in sensors 

– Sound, Light, Humidity and Air Pressure.  

 

 
 

The

 Sound sensor

 has two ranges: 

 

 

Decibel range

 (40 to 110 dBA) used to measure sound pressure level (loudness). It is responsive to 

both single sounds (such as a whistle or handclap) and continuous background noise (such as 
passing traffic, classroom noise). 

 

Millivolt range

 (±2000 mV) used when examining the frequency content of sound e.g. sound waves: 

monitoring the effect of altering frequency and amplitude, wave forms of musical instruments, beat 
patterns, etc.  

The 

Light level sensor 

has 4 ranges: 

 

 

 

Indoor (slow) 1 k lx

. This lower range is suitable for recording at indoor light levels and so is 

normally selected for use in the classroom.  

 

Indoor (fast) 1 k lx

. Unlike the other ranges this low range is unfiltered and so has a fast linear 

response. It can monitor rapid variations in light intensity, which cannot be observed with the eye 
e.g. fluctuations in the light intensity of a bulb due to voltage fluctuation. 

 

In/Out

 

10 k lx

. This medium range is suitable for recording bright light levels indoors or low light 

levels outdoors. 

 

Outdoor

 

100 k lx

. This large range makes it ideal for outdoor use (sunlight) and environmental 

monitoring.   

The

 Humidity sensor

 has one range, 0 to 100%. The sensor is used to monitor relative humidity i.e. the 

amount of water actually in the air compared with the amount of vapour needed to make the air saturated 
at the air’s current temperature. 

 

 

Built-in Sensors  Ranges  

 

Sound 

 
 40 to 110 dBA 
 ±2000 mV 
 

 

Light level 

Indoor (Slow)     1 k lx  (0 to 1,000 lx) 
 Indoor (Fast)     1 k lx  (0 to 1,000 lx) 
           In/Out    10 k lx  (0 to 10,000 lx) 
        Outdoor  100 k lx  (0 to 100,000 lx) 

 

Humidity 

 0 to 100% RH 

 

Air Pressure 

     85 to 110 kPa 
   850 to 1100 mbar 
     25 to 33 inHg 
  -200 to 1,000 m 
  -500 to 5,000 m 
  -500 to 10,000 m

 

Содержание EASYSENSE V-Log

Страница 1: ...EASYSENSE V Log Reference Manual DO248 5 1 Data Harvest Group Ltd 2014 EASYSENSE V Log Reference Manual ...

Страница 2: ...syLog 9 Snapshot 11 Timing 11 Counting 16 Review 17 System 17 19 Switch Off Sensor changing range or turning on or off Delete Data Full Reset Language Date Style Decimals Meter Text Technical information 19 Selecting the sensor range 19 Powering V Log 20 Batteries 20 Auto switch off 20 Internal Clock and Calender 21 V Log s memory 21 Hard Reset 21 Full Reset 21 Specifications 21 Care Maintenance 2...

Страница 3: ... hub or a USB mains charger that outputs 5 V at 1 A or more using the USB cable supplied A full charge can take up to 8 hours A battery charging symbol will be displayed on V Log s screen while the logger is charging Your computer must be turned on and not in sleep or standby mode otherwise the battery may drain instead of charge The EASYSENSE V Log data logger Plastic storage case Sensor leads 2 ...

Страница 4: ...eparately and are not supplied with V Log Sensors can be divided into two main types 1 Analogue used to measure physical quantities such as temperature sound light pH etc 2 Digital switch type sensors for measuring ON OFF conditions e g Light gates and Timing mats to calculate time speed and acceleration Please contact your supplier or the Data Harvest website www data harvest co uk for up to date...

Страница 5: ...ght level sensor has 4 ranges Indoor slow 1 k lx This lower range is suitable for recording at indoor light levels and so is normally selected for use in the classroom Indoor fast 1 k lx Unlike the other ranges this low range is unfiltered and so has a fast linear response It can monitor rapid variations in light intensity which cannot be observed with the eye e g fluctuations in the light intensi...

Страница 6: ...y Turn Off will be available Set range The cursor will indicate the current range selected Use the up or down buttons to scroll until the cursor is pointing at the required range Press enter to select that range Select to exit the sensor option window Select to return to the Meters window Turning a sensor ON or OFF the display V Log 8 s built in sensors can be switched On or Off the display With t...

Страница 7: ...y be detected and then display readings Meter In Meter mode V Log will display measurements from the sensors plug in or built in sensors on the LCD screen but will not store any data The size of the text in Meter mode can be altered From the System menu select Meter Text then either Single Height or Double Height With double height selected data from up to 4 sensors is visible on the screen scroll...

Страница 8: ...ug in and will show the number of samples taken so far Use the up or down buttons to scroll and view data from the sensors Note If V Log goes into sleep mode during logging press any button to wake up the logger and then press to take a reading 5 When you have finished sampling press the stop button to close the data set then to confirm your choice The readings will be stored as a data set with a ...

Страница 9: ...ed and the sample rate alters 1 Connect any plug in sensors if required If the display is turned off press any button to wake up the logger 2 While in the main menu use the up or down buttons to scroll until the cursor is pointing at EasyLog Press the enter button to automatically begin logging If using more than 3 sensors use the buttons to view the current value while still logging The bottom li...

Страница 10: ...nt it will begin to sleep auto switch off between samples to conserve battery power When V Log is asleep sensor readings can be viewed by pressing any button to wake it up Note V Log does not auto switch off when accepting power from the USB port When the sample interval is greater than or equal to one second after logging for 8 minutes and 20 seconds it is possible to download data from V Log to ...

Страница 11: ...napshot 09 05 12 16 12 43 At least 650 samples can be stored in one data set the limit is dependent on the number of sensors The contents of the data set can be Reviewed on V Log select Review from the main menu use the buttons to locate the data set press enter to select Use the buttons to scroll through individual readings see page 17 Downloaded to a computer by selecting Retrieve Retrieve Remot...

Страница 12: ...s you are using scroll the list of dimensions and select the size used 6 When a signal change from the digital sensor sensors is received the timing measurement will be displayed on the LCD screen Time data is measured in seconds Speed data is in metres per second m s Time menu Time at A Time at A or B Time from A to B Period at A Stopwatch A to A Speed menu Speed at A using Double Interrupt card ...

Страница 13: ...ormed on timing data by downloading to the EasySense software then using the Show Data as function from the Settings menu in Timing Timing options Time Speed or Acceleration at A Timing starts when the signal at input A changes and stops when the signal reverts back With Light gates it will be the time it takes for an object to pass through the light beam For a Push Switch it will be the length of...

Страница 14: ... for instantaneous speed or acceleration i e it took this amount of time to travel this distance and the speed or acceleration was The measurement of the Data Harvest Spoked Pulley is pre defined Set up the investigation but do not enter press enter until you are ready to take readings the spokes on the pulley can easily interrupt the Light gate beam and create false results When all is ready pres...

Страница 15: ...r B 3 Time to travel from A to B Period at A Start the pendulum swinging and when it is moving freely press enter to start timing the symbol will disappear from the bottom line The time will start to be measured when the pendulum first passes through the Light gate it will ignore the second signal change when the pendulum passes back through and will stop at the third change when the pendulum arri...

Страница 16: ...use the button to count people entering a room and to count those leaving V Log will display both the numeric value and show it as a bar graph The bar maximum starts as 10 if the count goes above 10 it will increase to 20 then 50 100 250 500 up to a maximum of 1 000 Note If V Log goes into sleep mode during logging press any button to wake it up If counts are from both A and B pressing the enter b...

Страница 17: ... at System Press the enter button to select 2 Use the up and down buttons to scroll the menu until the cursor is pointing to the appropriate system menu option Press the enter button to select Switch Off Used to send V Log directly into low power sleep mode even when it s connected to a USB port With the cursor pointing at Switch Off press the enter button to select Press any button to wake up the...

Страница 18: ... and press enter Press stop to return to the System menu Notes If you change a sensor s range or turn it on off via the logger while connected to a computer it may be necessary to select New in the software for these changes to be detected If a Full Reset is performed it will automatically return all sensors to their default state Delete Data Select whether to delete all or individual data sets De...

Страница 19: ...nternal clock is set automatically by the computers clock date and time each time it is connected to the computer and the EasySense software is run If the date or time on a data set is not correct check the date time settings on your computer Decimals Turn decimals Off or On with the cursor pointing at Turn Off or Turn On press the enter button to alter the selection from Off to On or vice versa T...

Страница 20: ...ent recharges will not cause any harm Frequent full discharges should be avoided whenever possible Ideally V log should be stored at about 40 or more charge Do not store V Log with its battery fully discharged or with sensors connected Even when turned off asleep V Log will use a small amount of current and the battery will slowly discharge some reserve charge is required to retain data and settin...

Страница 21: ...og to USB power 2 Press at the same time for a second and then release If the hard reset has been done correctly the LCD will display EASYSENSE V Log and the version number of its operating system before returning to the main menu Note A Hard Reset does not erase any stored data sets but if a recording is interrupted by a reset then the data being captured will not be stored If V Log still fails t...

Страница 22: ...d use the required security protocol Hereby Data Harvest Group Ltd declares that V Log WiFi is in compliance with the essential requirements and other relevant provisions of Directive 2014 53 EU A full copy of the Declaration of Conformity can be obtained by writing to the following address Data Harvest Group Ltd 1 Eden Court Leighton Buzzard Bedfordshire LU7 4FY UK Bluetooth specifications Blueto...

Страница 23: ... 1 Install the EasySense software if it is not already on your computer For details of how to install and operate this program please refer to the instructions provided with the EasySense software V Log requires version 3 5 or above of the EasySense PC Windows software The version number can be verified in About from the Help menu Step 2 Connect V Log to the computer s USB port using the USB cable...

Страница 24: ...e that a Local Interface connection has been established 2 If simultaneously sharing data with other network users On the Windows computer acting as the Controller interface connected to the computer select a Local Interface b EasySense Range as the interface c USB Port as the connection d Share Local Interface to allow others network user s to connect as Viewers Note Type in a more appropiate nam...

Страница 25: ...st of available devices OK The text on the top right of the EASYSENSE window will indicate that connection as a Viewer has been established On an iPad that will be acting as a Viewer a From Settings set Wi Fi to the same network that the Controller PC is connected to b Open the EasySense iPad software select the Not Connected text at the bottom right of the screen and select the name of the comput...

Страница 26: ...ies etc Note V Log WiFi loggers produced prior to April 2016 use 802 11b ensure the WiFi network is b mode compatible If a b mode module is fitted the logger s WiFi label will just show WiFi and when you reset the logger it will flash with WiFi V Log WiFi loggers produced after April 2016 use 802 11n ensure the WiFi network is n mode compatible If an n mode module is fitted the logger s WiFi label...

Страница 27: ... iPad select the required V Log by choosing it from the list in the EasySense iPad software To connect back to an Access Point network Select WiFi then Setup WiFi Select Create a Network To create connect the Access Point network without making any changes select Start a Network Open the EasySense App On an iPad tap on the status button Not Connected bottom right of the screen on an Android tap on...

Страница 28: ...oids to a V Log It is possible for a group of devices to connect to one V Log WiFi simultaneously to allow students to work collaboratively on a single experiment Note Performance maybe impacted if lots of devices are connected to the same logger When connecting to V Log the first device iPad Android or Windows PC to connect is given control of the logger and will therefore be able to setup start ...

Страница 29: ...urned on Disconnect after use as the battery will continue to drain if V Log is stored with Bluetooth still selected Ensure the firmware of V Log is at least V1 9 or higher Do NOT pair the devices when paired V Log will not be made available to the EasySense software When connecting to a Windows computer EasySense software users V3 10 or later of the EasySense Windows software must be installed An...

Страница 30: ...oduct 2070 or 2071 from the Data Harvest website Open Device Manager right click on the entry for the dongle typically listed under Other devices and select Update drivers Select to Browse my computer install manually locate and select the BLED112 directory When installed the adaptor will be listed under the Ports COM LPT section When connecting to a iPad or Android device An iPad will need to sup...

Страница 31: ...cause undesired operation 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 is fully compliant with WEEE legislation and is pleased to provide a disposal service for any of our products when their life expires Simply return them t...

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