Ground Resistance Tester Model 3640
Contents
1. After we obtain a valid reading we now move the potential measurement electrode to a point 52 of the distance between the grounding system and injector electrode and take another measurement For our final measurement we move the potential electrode to 72 of the distance We now compare our measurements If all three are close the injector electrode has been placed far enough away from the grounding system to produce reliable results In this case we simply add the three measurements together and divide by three to obtain the effective resistance of the grounding system If the readings vary significantly move the injector electrode further away and repeat the three measurements This concludes our quick demonstration of Fall of Potential testing For more information about the Model 3640 consult the documentation that comes with the instrument You can also visit the Model 3640 Product Page hittp www aemc com for additional specifications 4 Issue 07 WATTS CURRENT TECHNICAL BULLETIN Fall 2015 DataView Report Frames All data in a DataView report is displayed through frames These are rectangular boxes in which numerical and graphical data explanatory text and other visual components are displayed Frames determine which data is included in a report and how this data is presented There are a wide variety of frames You can create modify and move frames within a report or template Frames can also be linked so that th2. e DSP Digital Signal Processor is a specialized processor within the PEL instrument that handles the acquisition of measurement data and measurement calculations C Documents DataView DataFiles PEL gb3t ek EICHER Event Start of recording intemal synchronizaben of data Internal synchronizaten of data Intemal synchronization of data Scheduled stop of recording intemal synchronization of data Time 2 16 59 PM 2 16 59 PM dr 16 59 PHI 2 16 59 PH 10 16 53 PM 10 16 53 PM e Ride through is the period of time a data recording session will continue when external power is lost This is defined through the option Auto power off ride through in the General tab of the Configure dialog box in the PEL Control Panel If this option is disabled the instrument will continue recording until the battery power runs out and the instrument turns OFF Events are grouped into the six categories Recording Power Supply SD Card Sensor DSP and Other Recording Event Messages e Start of recording indicates when the recording session began e Scheduled stop of recording indicates the recording reached its scheduled stop time date e The recording resumed indicates that a recording that was interrupted before completion was re started e The user stopped canceled the recording before the scheduled time indicates that a scheduled recording was stopped manually by the user before the scheduled end date
3. AM 8 30 2012 8 47 00 000 PM Value Meter frame child 244 2 V1 V 2626 V2 V 233 4 V3 V Issue 07 WATTS CURRENT TECHNICAL BULLETIN Fall 2015 Note that a single parent frame can have multiple child frames Also not all frame types support child frames If the selected frame type does not support child frames the Link Frame icon and option are grayed out Consult the DataView Help for a complete list of which frames can serve as parent and or child frames To link a frame to another click the parent frame to select it Then click the Link Frame icon or choose Frame in the menu bar and select the Link Frame option Either action displays the Child Frame Type dialog box This lists all the frame types that can be linked to the selected frame In our example we will select Graph Legend and click OK The cursor changes to the Link Frame cursor use it to define the size and location of the frame Release the mouse button to display the dialog box appropriate for the child frame type which in this case is Graph Legend Properties Complete the selections and click OK The child frame now appears at the selected location This concludes our quick introduction to DataView report frames Consult the Help system that comes with DataView for detailed information about working with all types of frames DataView is a registered trademark of Chauvin Arnoux Inc d b a AEMC Instruments Issue 07 WAT
4. BK clamp Issue 07 WATTS CURRENT TECHNICAL BULLETIN Fall 2015 This diagram shows that the respective voltages and currents of each phase are associated correctly V1 and 11 V2 and 12 V3 and l3 If there is a connection error the diagram will resemble the examples below In the first example one of the current clamps 11 has been connected in the wrong direction So 11 trace is out of phase FNA 5000kz 03 11 03 10 28 a Ivi 238 8 v v3 238 2 v VT 238 9 v 12 121 23 118 31 121 EES ER UNBALANCE 0 8x RMS THD CF m ess QO In the second example two current clamps 12 and 13 are connected to the wrong phase For example the diagram shows I2 trace associated with V3 and I3 trace associated with V2 FNA 5000kz 03 11 03 10 28 B V3 Ivi 238 8 v 2 v2 238 2 v VT 238 9 v 12 121 d v1 23 118 31 121 lt GESS2e The use of phasor diagrams is an effective way of ensuring that the right connections are set up for reliable measurements and a successful recording campaign This can ultimately save you time and money when working for your client It also avoids the embarrassment of having to repeat the campaign due to initially incorrect wiring We welcome your feedback and can be reached at techsupport aemc com or by calling 1 800 343 1291 x351 for our Technical Support Help line About the Author Guy Belliveau is a Technical Support Specialist for AEMC Inst
5. EJ AEMC j INSTRUMENTS Chauvin Arnoux Inc CHAUVIN ARNOUX GROUP 15 Faraday Drive Dover NH 03820 USA 603 749 6434 Fax 603 742 2346 e www aemc com Issue 07 WATTS CURRENT TECHNICAL BULLETIN Fall 2015 eee el oo S Mi Featured Product Sess Ground Resistance Tester Model 3640 Ka D 7 d e y A Pp i A aad A Ay d e i r Q7 i gt 7 d A d m jf r a ee d d x 7 e di SC w AEA sa a j AY K y f Z WLA eg d bw ad s Z 8 Fa A 7 j Sf Sa ZE a eg aN S by a y Inside this Issue m Featured Product Fall of Potential Testing with the Ground Resistance Tester Model 3640 m Introduction to DataView Template Frames Customer Support Tip Ensure Correct Connections with Phasor Diagrams DataView PEL Control Panel Event Log Messages m AEMC Interview Dick McCarrick Technical Writer Issue 07 WATTS CURRENT TECHNICAL BULLETIN Fall 2015 Featured Product Fall of Potential Testing with the Ground Resistance Tester Model 3640 Grounding is a critical component of electrical systems Effective grounding provides a low resistance path for lightning and other phenomena that might otherwise damage electrical systems and injure personnel A common method for measuring the resistance of a grounding system is the Fall of Potential test also known as the 3 point or 3 pole test This involves injecting a current
6. few minutes to learn something useful and important to them To do that we want to be sure each video is addressing a real customer need So if anyone reading this has a suggestion for a future video topic please let us know Editor s note Visit the AEMC You Tube Channel What are the challenges producing documentation for a global company An obvious issue is translation Most of our user manuals and Help content are translated into multiple languages over a dozen in some instances This can be expensive and time consuming so we need to be sure the original material is clear and concise while simultaneously being thorough and complete We also need to be mindful of terminology For example a word such as default can have very different meanings depending on context and if mistranslated can be highly confusing to users So translated content is reviewed by someone who s both a native speaker of the language and is familiar with our products on a technical level Issue 07 WATTS CURRENT TECHNICAL BULLETIN Fall 2015 Q What are the main differences between and environments We want to share these writing user manuals and writing Help experiences with users in similar situations And as with videos we re very open to suggestions A User manuals are expected to have a formal for topics upon which to base future articles structure with topics in a specific order Usually this follows a task oriented flo
7. placed on the ground When the injector electrode is installed attach it to the instrument with the red lead Next place the potential electrode This is the electrode through which the instrument will obtain its measurements In full Fall of Potential testing we would take measurements at 10 increments of the distance between the grounding system and the injector electrode However today we ll demonstrate a simplified version of the test known as the 62 method This uses three test points at 52 62 and 72 of the distance between the grounding system and injector electrode If these measurements are close in other words if plotted on a graph they produce a more or less flat line as shown in the illustration below we can be confident that the injector electrode is inserted sufficiently far from the grounding system and that our results are valid If the results vary significantly move the injector electrode further away and retake the measurements 52 72 i SEY Ground system under test Effective resistance areas no overlap Reading variation 100 of distance Resistance Issue 07 WATTS CURRENT TECHNICAL BULLETIN Fall 2015 Our first measurement will be at 62 of the distance between the grounding system and injector electrode so insert the potential electrode at this point and connect it to the instrument with the blue lead To take the measurement simply press the button and wait a fe
8. time was reached 11 Issue 07 WATTS CURRENT TECHNICAL BULLETIN Power Supply Event Messages 12 The power supply has been lost instrument on battery indicates that the instrument was running on external power either through a voltage terminal adapter or through auxiliary AC power but the external power was interrupted causing the instrument to switch to battery power The recording was suspended after the loss of the power supply indicates that the instrument s external power supply was lost causing the instrument to run on battery power until it either 1 reached the end of the Auto power off ride through period or 2 the battery power ran too low to continue operation In the first case this message is followed by the message Instrument turned off due to expiration of ride through In the second case this message is followed by the message Instrument turned off due to low battery Both messages are described below Instrument turned off due to low battery indicates that the instrument did not have sufficient battery power to continue operation Instrument turned off due to expiration of ride through indicates the instrument automatically turned OFF because it reached the end of the period defined by Auto power off ride through When enabled this option causes the instrument to turn OFF after a user selectable period of time 3 10 or 15 minutes when it is running on ba
9. 30 2012 12 03 00 h min s 3 46 00 000 PM 2 hiDiv ee Text frame demo 8 30 2012 3 46 00 000 PM Value 2427 V1 V 261 0 V2 V 2321 V3 V N Linking Frames As we mentioned earlier frames can be linked This enables you to define one frame by the contents of another frame For example a Meter frame can be linked to a Channel Graph frame As you move the cursor in the Channel Graph frame the data displayed in the Meter frame is updated to display the values at the cursor position In this example the Channel Graph is referred to as the parent frame while the Meter frame is called the child frame Session Min Max Average Values Legend Name Min Min date Min time Max Max date Max time Ava Units Vi 240760 8 30 2012 44051000 PM 247 130 8 30 20 26 59 000 PM 244 790 V2 258 830 8 30 2012 4 40 51000 PM 265 790 8 30 2012 10 26 40 000 PM 263 197 V V3 230 190 8 30 2012 4 40 32 000 PM 236 270 8 30 2012 10 27 00 000 PM 234 015 V e ss sms ssssssssssssbkessssssssssssssssssbksssssssssbkssssssssbssssssssssssssssss sssssssssssssssssshssssssssssssssssss d Ss s ses ess sssssssssssssss bessssssssssssssssshssssssesessssssses d ns EE A AC A KKK EK EE EE EE EE EE EE EE EE em mm mmm mm mmm mmm mmm besse ms sms sms ss sbkessssssssbss ss ss ss besse sem sms ses sms heess emm m msn mmm ss sbes emm mmm mmm mmm mm wm d frame parent a See er 8 30 2012 12 03 00 h min s 8 31 2012 3 46 00 000 PM 2 h Div 3 49 00 000
10. TS CURRENT TECHNICAL BULLETIN Fall 2015 Customer Support Tip Ensure Correct Connections with Phasor Diagrams By Guy Belliveau A measurement campaign may be completely wrong if the measurements are not performed correctly One of NOTE Directional arrows are the most frequent mistakes is incorrect connections of marked on all of our PowerPad the voltage leads and current clamps current clamps and sensors These arrows should point towards the The simplest way to check that our Power Quality load The illustrations below show Analyzers PowerPads are correctly connected is the the directional arrows located phasor diagram Once the instrument has been fully on the top of the SR193 BK and configured this verification can be used to ensure that MN93 BK clamps Both clamps are the voltage leads and current clamps are positioned compatible with our PowerPads correctly This article assumes that the phases are identified as L1 L2 L3 and that different colors are assigned to the phases The phasor diagram can be accessed simply by pressing the waveforms button aw located on the front of the PowerPad casing and then pressing the phasor key If the wiring is correct the phasor diagram will look similar to the following Top of SR193 BK clamp FNA s0 00Hz 03 11 00 10 28 m Ivi 189 9 v Iv2 238 2 v va 238 9 v 12 121 23 118 31 121 GEEEL UNBALANCE 11 1 7 RMS THD CF e e Top of MN93
11. any frame type including those for which no dedicated icon exists e Link Frame H creates a new frame linked to the currently selected frame Notice that when you select a frame creation icon the cursor changes to reflect the type of frame you are creating Tools Window Help Me it BBP A Se fe NO A ap Min Max Average Values You can also create a frame by clicking Frame in the menu bar and selecting New Frame The cursor changes to the generic Create Frame cursor In our example we will place a simple text frame into the template To do this click the Insert Text icon and move the cursor to the location where the upper left corner of the frame will be placed Click and hold the left mouse button then drag the cursor to the location where the lower right corner of the frame is to be located A dotted box shows the size and location of the frame being created see below a ie inka Satan a w i e e302012 120300 h mincs 34600000 FM 2 WD Value at Cursor Value 2427 W1 V 261 0 V2 V 2321 V3 V la 8 30 2012 3 46 00 000 PM Issue 07 WATTS CURRENT TECHNICAL BULLETIN Fall 2015 Release the mouse button to display the Text Box Properties dialog box Type in the text and use the buttons to select options for text font size and effects When finished click OK The text frame now appears in the template where you can make any final adjustments to its size and position 8
12. ce documentation since so many changes But it s not as rigidly structured as user manuals would be occurring right as the product was about tend to be to go out the door And we try to make each Help topic as complete At AEMC we follow what consider to be a more and standalone as is reasonably possible since criteria driven philosophy As with any company there s no guarantee the user has read any other in a competitive industry we naturally want our part of Help They may have just come across products to be released in a timely fashion But some feature they didn t understand pressed we re also willing to hold off release until were F1 and went straight to that topic We don t want convinced the product is complete thoroughly them to have to jump around Help and follow a tested and fully functional This makes for a bunch of links to find the answer considerably more stable environment in which to produce documentation since major last minute changes are relatively rare Far more important Q What is your target audience for the this approach ensures our customers can be Technical Bulletin a confident all our products provide the versatility A Pretty much the same as the videos users reliability and quality they ve come to expect from who want to learn more about an instrument s AEMC capability or how to perform a particular task In fact there s a lot of overlap between topics covered in the Bullet
13. e data displayed in the parent frame determines which data appears in the linked child frame pasion Min Max Average Values Acht ZZ Name Mm ell date Min time Max Max date Max time Units Vi 240 760 012 4 40 51 000 PM 247 130 8 30 2012 10 26 59 0 IEA V2 258 830 1 30 2012 4 40 51 000 EM 265 790 8 30 2012 10 26 000 PM 263 197 V Text Box crn EE i Channel List frame Channel Graph 8 30 2012 1203 00 h min s 8 31 2012 3 46 00 000 PM 2 h Div 3 49 00 000 AM Value at Cursor 8 30 2012 3 46 00 000 PM Valu a Meter frame 261 0 V2 V 232 1 V3 V Window Min Max Avg Values Channel List Legend Name Min Min date Min time Max Max date Max time Avg ae VI 240 760 8 30 2012 4 40 51 000 PM 247 130 8 30 2012 10 26 59 000 PM 244 790 ga 258830 8 30 2012 4 40 51 000 PM 265 790 8 30 2012 10 26 40 000 PM 263 197 frame W3 230 190 6 30 2012 4 40 32 000 PM 236 270 8 30 2012 10 27 00 000 PM 234 015 M m _ Coversheet Table of Contents yo V V0 I A P kW S KYA Q kvar Ep kWh Es kVAh Ea kvarh Events Session totals Configuration Gossary In this article we briefly introduce the types of frames available in DataView We demonstrate how to create a frame And we also show how to link frames Creating a Frame To create a frame click the DataView icon on your desktop Close the Quick Start dialog box and then select File from the menu bar You can add a frame to either a template o
14. es that the DSP aggregation MAX registers have been reset e DSP write failure indicates the DSP did not respond to a write request The write request will be retried and should succeed if the failure was caused by a random condition If the failure is due to a problem with the DSP this condition will persist and prevent normal instrument operation In this case contact AEMC Technical Support Other e Event Code x indicates an event occurred for which no description is available The event code number is included in the message If you see this message please record the event code number and contact AEMC Technical Support T3 Issue 07 AEMC Interview Dick McCarrick Technical Writer wes Tf you re an AEMC customer chances are you ve used content produced by Dick McCarrick whether its the user manuals that accompany our products the Help systems for DataView and its Control Panels the videos on AEMC Ss YouTube channel or even this Technical Bulletin In this interview Dick explains the function and purpose of the various forms of AEMC content Q A 14 What is the purpose of the AEMC YouTube channel Not a lot of people may know this but the AEMC YouTube channel has been online for almost six years For the first few years we really didn t post a lot of videos on it When joined AEMC in 2013 one of my first responsibilities was to work with Technical Support S
15. icates that after an unscheduled interruption the instrument resumed receiving and recording measurement data Fall 2015 e Internal synchronization of data indicates the instrument has reset an internal data setting The message includes the type of synchronization operation performed e Enable DSP MAX detection is written to the DSP when the aggregation MAX detection mode is set to Aggregated MAX values updated while recording only When the recording ends the DSP will be instructed to disable aggregation MAX detection e Set nominal frequency indicates Auto was selected for the nominal frequency and the instrument reset it during the recording In general this message rarely if ever appears since the nominal frequency should be set before the recording starts e Reset partial energies If the Reset partial energy meters at the start of each new session option in the Meters tab of the Configure dialog box is checked this command is sent to the DSP to reset the partial energy meters when a recording starts e Reset total energies If the Reset total and partial energy meters at the start of each new session option in the Meters tab of the Configure dialog box is checked this command is sent to the DSP to reset the total energy meters when a recording starts e Reset DSP aggregation MAX registers If the instrument is configured to only detect aggregated MAX data when recording this message indicat
16. in and our YouTube channel Visually oriented users can visit our channel and users more comfortable with written material can consult the Bulletin In upcoming issues of the Bulletin we hope to provide more real world examples of how to use our products to solve problems in specific situations Over the years we ve accumulated a large reservoir of experiences working with customers in a wide variety of industries 15 IGJ AEMC INSTRUMENTS Chauvin Arnoux Inc d b a AEMC Instruments 15 Faraday Drive Dover NH 03820 USA Tel 800 343 1391 e 603 749 6434 e Fax 603 742 2346 www aemc com e techsupport aemc com Issue 07 Fall 2015
17. into the ground at a distance from the grounding system under test and then measuring potential at different points between the grounding system and injector electrode In this article we demonstrate how to perform a Fall of Potential test using the AEMC Ground Resistance Tester Model 3640 the simplest and easiest to use member of our Ground Resistance Tester product family This direct reading instrument measures ground resistances from 10 millionms up to approximately 2000 ohms at the push of a button no manual adjustments or settings necessary Among its features is auto ranging which automatically seeks out optimum measurement range for the test being conducted In addition to 3 point Fall of Potential testing the Model 3640 is also designed for 2 point continuity testing The instrument ships with all the color coded leads and electrodes necessary for ground testing Before you begin verify that the grounding system under test is de energized and isolated from other grounding systems In addition to safety considerations this ensures that the measurements truly reflect the resistivity of the grounding system We ll start by connecting the leads Insert the provided spade lugs into the ends of the leads and attach the lugs to the instrument terminals The green lead connects the instrument to the grounding system The red lead connects to the injector terminal and the blue to the measurement terminal Notice the jumper s
18. pecialist Guy Belliveau See the Spring 2014 issue of the Watts Current Technical Bulletin to help populate the channel with a steady stream of fresh content The goal is to provide short instructional videos that explain how to perform a certain task or highlight the capabilities of our instruments From the beginning we made the decision not to attempt splashy big production commercial style videos Instead we try to provide simple easy to understand explanations of specific topics real people talking to real customers as we like to say WATTS CURRENT TECHNICAL BULLETIN Q Fall 2015 How do you decide which topics to cover in these videos We get our inspiration from a number of sources Sometimes we ll produce a video to address a question that has resulted in multiple Technical Support calls such as how to connect a Simple Logger to a computer or how the various DataView file types are used Other videos are more general and explain concepts such as RMS and the Kelvin method for measuring resistance And many of our videos are product specific explaining the capabilities of an instrument or how to perform a particular task with it Our ultimate goal is to provide videos for each product offered by AEMC We re well aware that none of our videos will ever go viral but that s not our intent Instead we hope users will think of our channel as the go to place where they can spend a
19. r a report For demonstration purposes we will add a frame to a template so select Open Template from the File menu This displays the Open dialog box Locate and select the template file to be modified Template files are identified by the extension dvt In this example we will choose the PEL basic report template Note that if we later decide to save the changes we make to this template we must save it under a different name DataView does not allow you to modify and save a standard template under its original name Also be sure to name the new template with the dvt exten sion to ensure it is recognized as a template by DataView In addition to modifying and saving an existing template you can create a template by modifying a report and selecting the Save as Template option from the File menu When the template is open and displayed on the screen the icons in the toolbar are activated These include a set of icons designed for creating specific types of frames Issue 07 WATTS CURRENT TECHNICAL BULLETIN Fall 2015 e Draw Box o creates a box frame e Draw Line N creates a line frame e Draw Arrow creates an arrow frame e Place Word OLE creates a Word OLE frame e Insert Data Dei creates an Object Linking and Embedding frame e Insert Text Al creates a text frame e Place Table of Contents a creates a Table of Contents frame e Place Graph 5 creates a waveform or trend frame depending on the selected data e New Frame m creates
20. ruments Dover NH 10 Issue 07 WATTS CURRENT TECHNICAL BULLETIN Fall 2015 DataView PEL Control Panel Event Log Messages N PEL Control Panel C Users dmecarick AEM ea File Edit View Instrument Took Help 2 Ki Workstation H WW PEL Network My Open Sessions v 3P 3W Delta v Da Today s Session He gb20mayl4 amp kat min Summary by 1 s Measurements Ui 1 s Harmonics BR Session Totals Event Log AEMC Instruments Model PEL 100 series data loggers store a wide variety of measurement data When data from a recording session is downloaded to a computer using the DataView PEL Control Panel it is stored in an icp file Each icp file includes a folder called Event Log which you can view by opening the file in the PEL Control Panel and clicking Event Log in the navigation frame All events that occurred during the recording session are then listed in the data frame Some of these such as the start of the recording are relatively routine Others may indicate an error condition or other issue that may require contacting AEMC Technical Support Each event message contains up to four fields e Date indicates the date the event occurred e Time indicates the local time the event occurred e Event defines the type of event e For some messages a fourth column appears to the right of Event This provides additional explanatory information When viewing event messages note the following
21. the threshold is 54 seconds in a 64 second interval The PEL 102 103 has a 64 second buffer for 1 s trend data and 1 s harmonics When it requires 54 seconds to store 64 sample sets there is the potential of a buffer over run in which case the instrument stops recording 1 s harmonics If this condition occurs again the instrument stops recording 1s trend data The first message above indicates the recording of 1 s harmonics data has been terminated the second indicates 1 s trend data has been terminated Sensor Event Messages e Current sensor has been removed indicates a sensor was disconnected from the instrument during the recording session The terminal to which the sensor was connected is listed in the message If you see this message but the sensor Is still connected to the instrument it may indicate a problem with the sensor or the input terminal to which the sensor is connected e Current sensors changed indicates one or more sensors were disconnected from the instrument during the recording session and replaced with different sensors The terminal s to which the sensor s were connected are listed in the message DSP Event Messages e The acquisition of measurements has been interrupted in the instrument indicates the instrument stopped communicating with the DSP If this condition persists and or occurs frequently contact AEMC Technical Support e The acquisition of measurements by the instrument has resumed ind
22. trap attached to the red terminal This is for connecting the red and blue terminals together for continuity testing and is not used in Fall of Potential tests Attach the end of the green lead to the grounding system under test Fall of Potential testing is often performed on rods that have been disconnected from the grounding system in preparation for the test Another typical subject is a newly installed rod that needs to be qualified before being connected to a grounding system Issue 07 WATTS CURRENT TECHNICAL BULLETIN Fall 2015 Now let s place the electrodes For Fall of Potential testing the injector electrode should be placed at a distance at least 8 to 10 times the depth of the grounding system For example if you re testing a grounding rod that has been inserted into the soil to a depth of 10 feet place the injector electrode at least 80 to 100 feet away from the rod It s good practice to place the electrode further away than is minimally necessary Placing the electrode further than is necessary has no negative impact on the measurement but placing the electrode too close can render the measurement invalid Note that if you are measuring a ground ring or grid the longest diagonal length should be used as the rod depth in calculating the injector electrode distance When taking the initial measurement the depth of the auxiliary electrode is not critical In some locations with very moist soil the electrode can simply be
23. ttery power either by user choice or due to an interruption in the external power supply Instrument turned on power supply restored indicates that power has been restored to the instrument after a shutdown due to low battery power Instrument turned on power supply not restored running on battery indicates that when the instrument was turned ON there was no external power available so it operated on battery power This is usually the result of a user pressing the Power button when the instrument is unplugged for example 1 the instrument was recording 2 power was lost 3 the instrument turned Fall 2015 OFF after the ride through period expired then 4 the instrument was turned back ON by the user SD Card Event Messages The recording was suspended when the SD Card memory became full indicates 1 the instrument s SD Card reached its maximum data storage capacity during the recording session or 2 the 1 s harmonics or 1 s trend data reached 4GB in size When either happens the instrument stops recording data If the SD Card is full you will need to erase the SD Card s memory to start another recording If you schedule long recording sessions and see this message repeatedly consider replacing the SD Card with another card with more storage capacity Excluding 1 s harmonics and trend measurements from the recording may also help avoid this situation The recording was suspended when the SD Card was e
24. w with information presented in the same sequence a typical Q How does producing content at AEMC user is likely to need it introduction setup differ from other companies configuration operation and so on Not everyone A Tue been a Technical Writer for over 35 years reads manuals cover to cover of course many users especially experienced ones will go straight to the section they need and skip the rest But the expectation is that topics are ordered ina way that s both logical and useful working for companies that ranged from small startups to giant multi national corporations One common theme among those companies was what call a calendar driven approach to product development Basically they d pick Help systems tend to be more free form with a date to deliver a product and then stick to users jumping in from many different entry points that date at all costs If the product wasn t quite such as pressing F1 or the Help button on the ready by the deadline they d often find a way screen It s probably relatively uncommon for a to ship it anyway maybe some features would user to open the Help system and then read all be dropped or the product would be released the topics from beginning to end We still order with known issues Needless to say this created the topics ina logical sequence for users who a somewhat chaotic environment in which to feel comfortable navigating a Table of Contents produ
25. w seconds for the reading on the display to stabilize The Model 3640 is auto ranging so no other manual setup is necessary As you can see in the following illustration our measurement at the 62 point is 11 ohms O os GROUND TANCE TESTER MODEL The Model 3640 has three fault indicators e X Z Fault generally indicates the ground resistance at the injector electrode is too high If this light flashes you can insert the electrode deeper into the ground add additional electrodes in parallel with the first or moisten the ground around the electrode to improve conductivity Note that this indicator also flashes when the instrument s fuse is blown or when the lead is not connected and the circuit is open e X Y Hi Resistance is similar to X Z fault except that it indicates the resistance at the potential measurement electrode is too high The same fixes described for X Z Fault applies e X Y High Noise indicates stray voltage is in the soil This could be due to a source of electromagnetic interference EMI for example high tension lines right above the instrument or along the run of the leads being present in this location This can be addressed by using shielded leads Or you can apply a quick fix by twisting the blue and red leads together along their runs In addition to these indicators the LCD displays a reading of 1 if the resistance exceeds the instrument s measurement range Overrange is also indicated by blinking on the LCD
26. xtracted indicates the SD Card was removed from the instrument during the recording session If this was not done intentionally check the instrument to ensure the SD Card has not been accidentally dislodged When the card is re inserted the recording session will resume The recording resumed when the SD Card was inserted indicates the SD Card was re inserted into the instrument after being extracted The recording session resumes when the card is re inserted into the instrument SD Card interface reset indicates the instrument cannot communicate with its SD Card Replace the SD Card if this condition still persists and or occurs frequently contact AEMC Technical Support The following two messages are associated with the rate at which data is recorded to the SD Card The SD Card began to saturate Recording of 1 s harmonics terminated to preserve integrity of recorded data The SD Card began to saturate Recording of 1 s trend terminated to preserve integrity of recorded data Issue 07 WATTS CURRENT TECHNICAL BULLETIN As the size of a data recording increases the time required to access the SD Card lengthens When the write time for harmonic data reaches a threshold the PEL Control Program stops recording 1 s harmonics data This prevents loss of 1 s trend or aggregate data This threshold is dependent on the PEL model and firmware revision For example for version 1 17 of the PEL 102 103 logger firmware
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