dt4208sd - General Tools And Instruments
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1. 52 TKTempC AI TIORTempC 2 28 T12KTemp C 00 BITK 251 TKTempC AITHTempC AS THKTempC AI TERTenp AG TEKTempC 253 1KTempC AS TORTempC 29 T12KTemp 2 18009 BTK MTK 5 HAMC A TKTempC AS TIORTempC 31 THKTempC 52 T12KTemp 180021 211 ALRK HGK BLW BANC AS TIORTempC 31 THLKTeapC 25 180023 2TKempC 52 BAK 5 le BAK YST BIW BANT A3ITOKTempC AT KTempC Fig 2 Typical Excel data only screen 400 O 15 10 9 III 17 59 35 17 59 37 17 59 39 17 59 41 17 59 43 17 59 45 17 59 47 17 59 49 17 59 51 17 59 53 17 59 55 17 59 57 17 59 59 18 00 01 18 00 03 18 00 05 18 00 07 18 00 09 18 00 11 18 00 13 18 00 15 18 00 17 18 00 19 18 00 21 18 00 23 18 00 25 18 00 27 18 00 29 18 00 31 18 00 33 18 00 35 18 00 37 18 00 39 18 00 41 18 00 43 18 00 45 18 00 47 18 00 49 18 00 51 18 00 53 18 00 55 Fig 3 Typical Excel graphics only screen SPECIFICATIONS Display type Display size Parameter measured LCD with green backlight 3 23 x 2 40 in 82 x 61mm Temperature in F or C Measurement range With K type thermocouples 148 to 2372 F 100 to 1300 C two included TPK500 probes have measurement range of 50 to 500 F 45 to 260 F With J type 148 to 2102 F 100 to 11502. 9VDC adapter for a 110V power supply General P N AC1 Types J T E R and S thermocouples are widely available from industrial distributors WARRANTY INFORMATION General Tools amp Instruments General s DT4208SD 12 Channel Temperature Recorder with Excel formatted Data Logging SD Card is warranted to the original purchaser to be free from defects in material and workmanship Subject to certain restrictions General will repair or replace this instrument if after examination the company determines it to be defective in material or workmanship for a period of one year This warranty does not apply to damages that General determines to be from an attempted repair by non authorized personnel or misuse alterations normal wear and tear or accidental damage The defective unit must be returned to General Tools amp Instruments or to a General authorized service center freight prepaid and insured Acceptance of the exclusive repair and replacement remedies described herein is a condition of the contract for purchase of this product In no event shall General be liable for any incidental special consequential or punitive damages or for any cost attorneys fees expenses or losses alleged to be a consequence of any damage due to failure of or defect in any product including but not limited to any claims for loss of profits RETURN FOR REPAIR POLICY Every effort has been made to provide you with
3. has an SD card slot or through an SD card reader Because the files containing time stamped data logs have the file extension xls they open in Microsoft s Excel application Figures 2 and 3 show two kinds of Excel presentations a data only screen and a graphics only screen fe Me St SO tS Til Unt 10 Unt 1 MIE 115035 AG TIKTempC 6 TAKTempC AIK AG THTempC AH THKTempC TERTemp AS TKTempC 27 TKTempC AS TIOKTempC AGTLLKTempC 245 TL2KTempC 2 115051 HSK AIK HSK 6 TEkTenp AIK AS THTempC AT TKTempC AS TIORTempC 245 T12KTempC 3 175939 6 TRTempC AH THKTempC 97 AS THKTempC 247 T9KTempC AS TIONTempC 245 TL2KTemp C 4 20612 NKC AG TKTempC VKC AS THTempC A3TIORTempC 245 T12KTeap C SAMME 15 NTK AIK AGTH TempC SLA TSKTempC 6 TEkTemp 256 THkTempC AS THTempC AS TIORTempC SLATLKTempC 245 TL2KTempC 6 119085 AS TIKTempC HANKI 321 T3KTempC 265 TIkTempC AS THKTempC AITIORTempC 246 TL2KTemp C SAT HITIK AS TAKTempC LIKT AINK AH TITempC 3 THORTempC 246 TL2KTeap C 9 115949 ASTR 249 T2KTempC A7TKTempC MSTK AS TETempC 25 WeTempC 23 TOKTenpC 26 T2KTenp C 9 115051 QS TIKTempC NIKT AH TikTempC AS THTempC 253
4. 1KTempC AS TORTempC 52 0 95 7983 QS TIKTempC AIM NAK K A TKTenpC AS TIORTempC AZ TLLKTeapC 248 T12KTeap C 1 175955 QA TIRTempC AB TARTeapC HAWK AG TKTempC 4 TTempC AITIORTempC 248 Tl2KTempC 12 175957 BITK AB TATempC AS TITempC ABTKTempC DTK AB TkTemp 64 TTempC AH THKTenpC 54 TUTempC AITIORTempC 248 T12KTenp C 175959 B2TiKTeapC AB TeTempC DSRC DKC AH THKTenpC 25379 7 AITOKTenpC 249 T12KTenp C 4 BWA 251 TIKTempC BOKT 253 TTkTempC AL THKTempC 253 19KTempC AS TIORTempC NA T12KTemp C 5 180003 HTK 8 TAKTempC BIKT 52 TTKTempC AL THTempC 252 19KTempC AS TORTempC 248 TL2KTemp C 6 AMME 180005 AG TIKTempC NIKT BORKI HAKI 2 TMKTempC AL THKTempC G2 TKTenpC AS TIORTempC 248 TL2KTemp BMN NITKI AIK HTK AH THTempC 2 1KTempC AS TIOKTempC T12KTempC B 000116 180009 HITIK 27 TKTempC 2RTITempC MATRIC AL THKTemp TKTenpC BITC 23 TOKTempC 248 T12KTenp C 9 AMME AO TIKTempC HALKI NAKI 5 TTTempC AH THTempC 252 79KTenpC AS TIORTempC 248 TL2KTemp C 2 ANGLING AAITIRTempC 249 T2KTempC ASTR 21 TkTempC AL TTempC B2TWKTempC 243 TOKTempC A2TKTenpC 8 T12KTeap C 2 ABTHTempC
5. C With T type 148 to 752 F 100 to 400 C With E type 148 to 1652 F 100 to 900 C With R type 32 to 3092 F 0 to 1700 C With S type 32 to 2732 F 0 to 1500 C Measurement accuracy Measurement resolution With J and E type thermocouples 0 4 of reading 2 0 F max With R and S types 0 5 of reading 5 F With J and E type thermocouples 0 1 F or C below 1000 F 1 F or C above 1000 F With R and S types 1 F or C Sampling time options 0 1 2 5 10 30 60 120 300 600 1800 or 3600 seconds Settable parameters Storable readings Date time decimal point or comma decimal division auto power off beep sound loop data recording enable disable and start stop times temperature unit sampling time thermocouple type and offset Maximum minimum peak SD card capacity 1 GB to 16 GB Operating temperature 32 to 122 F 0 to 50 C Operating relative 0 to 85 humidity Power source 8 AA batteries or optional 9 VDC AC adapter Power consumption 7 5 mADC normal operation with backlight off and SD card not saving data 25 mADC with backlight off and card saving data 36 mADC with backlight on and card saving data Dimensions 8 86 x 4 92 x 2 52 in 225 x 125 x 64mm Weight 1 84 Ib 8270 MAINTENANCE amp TROUBLESHOOTING TI
6. C ENTER button Set the current year by pressing the TYPE A or W button repeatedly until the correct value appears flashing on the top line of the left column Quickly within three seconds press the REC ENTER button to store the setting The next screen that appears will show the value 01 flashing on the second line Use the TYPE or 7 button to navigate to the current month and press the REC ENTER button to store the setting When the value 01 begins flashing on the third line again use the TYPE or PAGE 4 button to navigate to the current day and press the REC ENTER button to store the setting If you press buttons too slowly in setup mode the screen will revert to the normal real time measurement display To return to the first step in the setup sequence press and hold the SET button again To move ahead to the next field in the sequence or to the next parameter press the HOLD NEXT button Once you have set the date the display will prompt you to set the hour minute and second of the current time in 24 hour format The three values appear on the top three lines in the right column of the Date Time Setting screen To set each value again use the TYPE A or PAGE buttons to navigate to the correct values followed by the REC ENTER button to store the setting 4 Set the start and stop times for loop data recording logging up to 12 channels of temperature information during the same period f
7. GENERAL 12 CHANNEL TEMPERATURE RECORDER WITH EXCEL FORMATTED DATA LOGGING SD CARD USER S MANUAL DT4208SD Please read this manual carefully and thoroughly before using this product TABLE OF CONTENTS fees eos ee ee ee eee re oe ies 3 Key FeatureS 4 What s in the 4 Product Overview 5 Setup 5 6 8 Adjusting Thermcouple Offsets 8 Operating 5 9 12 Normal Operation 9 Holding and Storing Measurements 10 Automatic vs Manual Data Logging 10 11 Transferring Data from the SD Card to 12 Specifications 13 Maintenance amp Troubleshooting Tips 14 Optional 50 14 Warranty Information 15 Return for Repair Policy 15 INTRODUCTION Thank you for purchasing General Tools amp Instruments DT4208SD 12 Channel Temperature Recorder with Excel formatted Data Logging SD Card Please read this user s manual carefully and thoroughly before using the instrument The DT4208SD is a general purpose handheld instrument that can measure up to 12 channels of temperature with 0 4 accuracy using any of six different
8. PAGE 7 button until the unit you prefer F for Fahrenheit C for Celsius is displayed Then press the REC ENTER button to store the selection as the default 9 Set the data logging sampling time Once the default temperature unit has been selected and stored the display will show the term SP t in the third row of the right column Press the REC ENTER button and then press the TYPE or PAGE W button to decrease or increase the value until the desired sampling time appears above SP t The options 0 1 2 5 10 30 60 120 300 600 1800 and 3600 seconds 0 seconds to 1 hour Then press the REC ENTER button to store the selection as the default 10 Format the SD card Once the sampling time has been set and stored the term Sd F will appear in the bottom row of the right column Press the REC ENTER button Pressing the REC ENTER button will cause the word to appear over the term Sd F Press the TYPE or PAGE button to toggle between and yES Choose yES whenever a new SD card is being used or when a used Card is being repurposed from use with another SD card instrument or a camera for example and all data on it is to be erased Choose no to preserve any data on a card previously used with this instrument Press the REC ENTER button to make a selection If you choose yES after you press the REC ENTER button the instrument will prompt you to
9. PS Keep your probes and thermocouples clean When the icon cx appears in the upper left corner of the display it s time to replace the eight AA batteries that power the instrument although measurements will remain valid for several hours after the low battery indicator first appears Replacing the batteries requires removing the two screws that hold the battery compartment cover in place as explained in Step 1 of the Setup Instructions on p 6 After inserting fresh batteries in the correct orientation replace the cover and tighten the screws to secure it If the meter freezes like a Computer and buttons become unresponsive try resetting the instrument by pushing the RESET button on its right side callout 1 12 of Fig 1 with the end of a paper clip Remove the batteries when storing the instrument for an extended period of time Do not drop or disassemble the instrument or immerse it in water OPTIONAL ACCESSORIES Optional accessories available from General Tools amp Instruments include e Additional TPK500 thermocouple probes e 900 thermocouple probes with a measurement range of 50 to 900 F 45 to 482 C e 5 thermocouple probes with a measurement range of 40 to 1562 F 40 to 850 C e thermocouple probes with a measurement range of 40 to 950 F 40 to 510 C e Other type thermocouple probes and extenders of various diameters types and measurement ranges e
10. a reliable product of superior quality However in the event your instrument requires repair please contact our Customer Service to obtain an RGA Return Goods Authorization number before forwarding the unit via prepaid freight to the attention of our Service Center at this address General Tools amp Instruments 80 White Street New York NY 10013 212 431 6100 Remember to include a copy of your proof of purchase your return address and your phone number and or e mail address Specialty Tools amp Instruments GENERAL TOOLS amp INSTRUMENTS 80 White Street New York NY 10013 3567 PHONE 212 431 6100 FAX 212 431 6499 TOLL FREE 800 697 8665 e mail sales generaltools com www generaltools com DT4208SD User s Manual Specifications subject to change without notice 2013 GENERAL TOOLS amp INSTRUMENTS NOTICE WE ARE NOT RESPONSIBLE FOR TYPOGRAPHICAL ERRORS MAN DT4208SD 2 21 13
11. ay Pressing the REC ENTER button again briefly will make the term MAX appear to the right of REC and switch the display to the maximum value stored in memory during the current recording session Pressing the REC ENTER button again briefly will make the term MIN appear to the right of REC and switch the display to the minimum value stored during the current session 3 To exit recording mode press the REC ENTER button and hold it for at least three seconds until the term REC disappears from the top line of the display The display will then revert to showing real time readings AUTOMATIC VS MANUAL DATA LOGGING The DT4208SD can automatically log data at a user selected sampling period from 1 second to 3 600 seconds one hour To view the sampling time that the instrument has been set up to use press the LOGGER button which has the words Sampling time check stenciled below it once The lower left corner of the display will briefly show the term SP t followed by the currently programmed sampling time in seconds To change the sampling time enter setup mode and perform Step 9 of the Setup Instructions Before entering data logging mode remember to disable the meter s Auto Power Off function To do so enter Setup mode as explained in the Setup Instructions on p 6 and select no during Step 6 Also be sure that the meter either is running on fresh batteries or is being powered by AC t
12. confirm that decision by displaying the term Ent below yES and sounding three beeps if the beeper is enabled To confirm that you want to begin the erasure formatting procedure press the REC ENTER button Ent will then flash several times and the instrument will sound another three beeps to confirm that the SD card has been erased and formatted Once the SD card has been formatted or not the display will return to flashing the first of the eight steps in the setup sequence setting the current date and time To re enter the setup sequence in order to change one or more settings press the REC ENTER button If you are satisfied with the existing settings press the POWER ESC button to exit setup mode and enter normal operating mode ADJUSTING THERMOCOUPLE OFFSETS To maximize the accuracy of measurements General strongly recommends that you compensate for offset the small measurement error peculiar to each thermocouple used with the instrument To adjust the offset of a thermocouple press the TYPE A button until its type appears on the top line of the display Then plug the thermocouple into the T1 jack on the top of the thermometer Press the LOGGER button which has the term Offset stenciled above SEt oFS it hold it for at least three seconds and then release the button The 2 7 screen shown at right will appear measuring adjust value value Next use the TYPE A or PAGE 7 button to adjust the value und
13. eight AA batteries or optional 9V AC DC adapter WHAT S IN THE CASE The DT4208SD comes fully assembled in a carrying case along with a 2 GB SD memory card two general purpose K type thermocouples General P N TPK500 and this user s manual Optional accessories available from General Tools amp Instruments include e Additional type thermocouples of various diameters types and measurement ranges e A 9VDC adapter for a 110V power supply See the Optional Accessories section of this manual for more details PRODUCT OVERVIEW Figure 1 shows all of the controls and indicators on the front right side back and top of the DT4208SD Familiarize yourself with the positions and functions of these controls indicators and connectors before moving on to the Setup Instructions TOP Fig 1 The DT4208SD s controls and indicators and other physical features 1 1 LCD 1 10 SD CARD socket 1 2 POWER ESC button 1 11 RS232 output jack 1 3 HOLD NEXT button 1 12 RESET button 1 4 REC ENTER button 1 13 DC9V jack 1 5 TYPE A button 1 14 Housing penetration and rubber plug 1 6 PAGE Y button reserved for future use 1 7 LOGGER button 1 15 Flip up stand 1 8 SET button 1 16 Battery compartment cover 1 9 Thermocouple jacks T1 through T12 1 17 Battery compartment cover screws SETUP INSTRUCTIONS 1 Choose the power source Before using the DT4208SD make sure it is powered by fresh batteries an
14. er oFS to match the value under SEt Then press the REC ENTER button to store the offset adjustment and return the instrument to measurement mode Repeat the procedure for each thermocouple to be used OPERATING INSTRUCTIONS NORMAL OPERATION 1 To prepare to make measurements power on the DT4208SD and make sure an SD card is firmly seated in the socket on the bottom of the instrument By default the DT4208SD uses Celsius units for temperature measurements If you wish to make Fahrenheit units the default press the SET button to enter setup mode Using the HOLD NEXT button skip ahead to Step 8 of the Setup Instructions and perform it 2 To use K type thermocouples to measure up to 12 channels of temperature plug one to 12 of them two are supplied others are available for purchase from General into the jacks callout 1 9 of Fig 1 on the top of the temperature recorder Make sure jack T1 is occupied Because is the instrument s default thermocouple type plugging in up to eight K type thermocouples will instantly produce up to eight display readings Any of the eight channels that are not used will show the overrange reading To show the other four of the 12 channels press the PAGE W button once To return the display to Channels 1 through 8 press the PAGE W button again 3 To use J T E R or S type thermocouples to measure up to 12 channels of te
15. hrough a 9VDC adapter 1 To start automatic data logging press the REC ENTER button once The top line of the display will then show the term REC Pressing the LOGGER button at this point will make REC flash and add the flashing term DATALOGGER at the bottom of the display This indicates that the instrument is sampling measurements at the programmed rate and storing the readings and their time stamps in memory 2 To pause automatic data logging press the LOGGER button once this will make the flashing term LOGGER disappear from the bottom of the display and change the term REC from flashing to constant Pressing the LOGGER button again resumes automatic data logging 3 To end automatic data logging first press the LOGGER button to pause data logging Then press the REC ENTER button and hold it for at least two seconds This will cause REC to disappear 4 To log data manually set the sampling time to zero using Step 9 of the Setup Instructions on p 8 Then press the REC ENTER button once The display will show the term REC on the top line and a flashing letter and a number from 1 to 99 on the bottom line The number indicates the position on the SD card that will be used to store manually logged data In manual data logging mode this position can be changed 5 To change the storage location of manually logged data press the TYPE W button once this will cause the P to disappear f
16. ird row of the left column Press the REC ENTER button This will cause the term to appear in the lower right corner below the term USA Use the TYPE or PAGE YW button to make USA or Euro as desired appear above dEC and then press the REC ENTER button to store the selection as the default 6 Enable or disable auto power off APO Once the format of decimal point divisions has been set and stored the display will show the term PoFF in the bottom row of the left column Press the REC ENTER button and then press the TYPE or PAGE V button until the desired automatic power off management scheme yES for enable no for disable is displayed Press the REC ENTER button to store the selection If enabled the APO function shuts off the DT4208SD if no front panel buttons are pressed during any ten minute period 7 Enable or disable the beeper Once the APO function has been enabled or disabled the display will show the term bEEP in the top row of the right column Press the REGC ENTER button and then press the TYPE or PAGE YW button until the desired setting yES or no is displayed Finally press the REC ENTER button to store the selection as the default 8 Select the temperature unit Once the beeper has been enabled or disabled the display will show the term t CF in the second row of the right column Press the button and then press the TYPE or
17. mperature first press the TYPE button as many times as necessary until the letter of the thermocouple type you are using appears on the top line of the display Then plug one to 12 of the optional accessories into the jacks on the top of the thermometer As with type thermocouples display readings are instantaneous Use the PAGE button to toggle between displaying Channels 1 through 8 or Channels 9 through 12 as with K type thermocouples Whenever the thermometer is in measurement mode you can turn off the backlight which is on by default by briefly pressing but not holding the POWER ESC button which has a backlight icon stenciled above it To reactivate the backlight briefly press the button again Whenever the instrument is in measurement mode you also can check the current date and time by briefly pressing the SET button which has the words Time check stenciled below it Doing so causes the three settings year month day and hour minutes to appear briefly and in that order at the lower left of the display HOLDING AND STORING MEASUREMENTS 1 To hold a measured value press the HOLD NEXT button during the measurement Doing so will cause the word HOLD to appear at the top of the display Pressing the HOLD NEXT button again releases the hold 2 To record and recall readings press the REC ENTER button while making measurements This will make the term REC appear at the top of the displ
18. optional 9VDC AC adapter plugged into the DC9V jack on its right side callout 1 13 To remove the battery compartment cover callout 1 16 remove the two screws callout 1 17 holding it in place Then install eight AA batteries in the correct orientation using the polarity marks on the inside of the compartment as a guide Replace the cover and secure it by tightening the two screws 2 Install an SD card To prepare for setup also install the supplied 2 GB SD card or another card of 1 GB to 16 GB capacity in the socket on the right side of the instrument callout 1 10 When installing the card make sure its gold contacts are facing the back of the instrument and push the card into the socket until you hear a click To remove the card push it in until you hear a click and the card pops out Now power on the instrument by pressing the POWER ESC button callout 1 2 to generate a short beep To power off the DT4208SD press the POWER ESC button and hold it until the instrument responds with a long beep When the temperature recorder powers on a series of transient startup screens will briefly appear Once the display has stabilized perform the following eight setup steps in the order presented 3 Set the date and time Press the SET button callout 1 8 and hold it for at least five seconds until the word dAtE appears flashing on the top line of the left column of the display Quickly within three seconds press the RE
19. or example 14 15 to 15 30 every day Once you have set the date and time the display will show the flashing term LooP in the second row of the left column Press the REC ENTER button and then with 00 flashing under the term StAR in the left column use the TYPE and PAGE buttons to set the first of the four values that define the loop the starting hour Press the REC ENTER button to store your selection Then use the and PAGE W buttons with 00 flashing below the term t in the right column to set the loop s starting minute Again press the REC ENTER button to store your selection Repeat this sequence twice more to set and store the loop s ending hour and minutes values you have entered the fourth value the loop s ending minute star Loop the following screen will appear no To enable recording of data during the specified loop duration press either the TYPE A or PAGE button to change the no to a yES and then press the REC ENTER button to store the selection To disable recording press the REC ENTER button without changing the no to a yES 5 Choose a decimal point or comma to represent the decimal division between integers and fractions for example American style 20 88 vs European style 20 88 Once you have set the start and stop times of loop data recording and enabled or disabled the function the display will show the term dEC in the th
20. rom the left side of the display and the value on its line to begin flashing Once the flashing begins you can use the TYPE and PAGE buttons to change the flashing value to any number between 1 and 99 you have chosen the storage location press the REC ENTER button to save the setting This will cause the value to stop flashing and the P to return 6 To end manual data logging press the REC ENTER button and hold it for at least three seconds This action will cause REC to disappear from the top line of the display 7 To execute the loop data recording function if the function was enabled during setup press the REC ENTER button while the instrument is in measurement mode Doing so will make the term REC appear at the top of the display and prepare the instrument to log data during the specified daily period 8 To pause loop data recording during the specified period press the LOGGER button once This will make the term REC stop flashing Pressing the LOGGER button again will resume loop data recording 9 To end loop data recording press the REC ENTER button and hold it for at least three seconds This will cause REC to disappear from the display and end loop data recording TRANSFERRING DATA FROM THE SD CARD TO A COMPUTER After automatic or manual data logging of measurements or loop data recording remove the SD card from the instrument and plug it into your computer either directly if it
21. the measurements on an SD card plugged into the instrument a process called data logging the user can remove the card and plug it into to a laptop or desktop computer either directly or through an SD card reader The data logs are stored on the card as files with the xls extension which can be opened by Microsoft s Excel application The DT4208SD has a backlit 3 9 in diagonal display and is powered by eight batteries or an optional 9 VDC AC adapter KEY FEATURES e Twelve independent temperature measurement channels Displays up to eight channels at a time one push of a button switches to Channels 9 through 12 Works with and automatically temperature compensates for six popular thermocouple types J S R Combining thermocouple types extends potential measurement range to 148 to 3092 F 100 to 1700 C Can automatically log up to 12 channels of data every day during same period loop data recording Big 3 9 in diagonal front panel green backlit LCD is easy to read e Displays maximum and minimum readings and holds any reading e Automatically logs measurements at sampling time settable from one second to one hour Also supports manual data logging and changing of SD card storage location e Outputs Excel compatible data logs e Accepts SD memory cards of up to 16 GB capacity e Auto power off function that can be disabled to enable long term data logging Powered by
22. types of thermocouple Up to eight channels can be displayed at a time The instrument also can be configured to automatically record up to 12 channels during the same period every day a function called loop data recording Although thermocouples are not as accurate as other types of thermometers they more than make up for this shortcoming with an extended measurement range For example the DT4208SD can measure and read out temperatures from 148 to 2372 F 100 to 1300 C using K type thermocouples and temperatures from 148 to 2102 F 100 to 1100 C using J type thermocouples R and S type thermocouples have an even higher upper limit The two K type thermocouples included with the instrument have a measurement range of 50 to 500 F 45 to 260 F These very wide ranges plus a fast response time and a low price tag suit thermocouple thermometers for a variety of commercial and industrial tasks requiring measurement of very high and low temperatures Examples include applications in the food and chemical processing industries HVAC heating ventilation and air conditioning power generation and paper production Because it is microprocessor based the DT4208SD can make full use of the portability reliability and large storage capacities that SD memory cards offer Measurements can be made automatically at any sampling rate between one second and one hour After time stamping and storing
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