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MI 3290 Earth Analyser

Appendix D

–Pulse and 3-pole example

151

Appendix D

– Pulse and 3-pole example

Test objects description and schematics wiring diagram:

Test Object Ro

Re1



1 µH



200



Re2



25 µH



200



Re3



55 µH



200



Re4



376 µH



200



Impulse measurement results:

Impulse [Zp]

Re1

Re2

Re3

Re4

10/350 µs

1,0



1,1



2,0



12,6



pro

Figure D.1: Oscilloscope screenshot Re1

Figure D.2: Oscilloscope screenshot Re2

Figure D.3: Oscilloscope screenshot Re3

Figure D.4: Oscilloscope screenshot Re4

3- pole measurement results:

3 –pole [Re]

Calculated impedance value

Test Frequency

Re1

Re2

Re3

Re4

Re1

Re2

Re3

Re4

55 Hz

1,04



1,10



1,08



1,11



1,0



1,0



1,0



1,0



164 Hz

1,04



1,11



1,08



1,17



1,0



1,0



1,0



1,1



660 Hz

1,04



1,11



1,11



1,93



1,0



1,0



1,0



1,8



1,5 kHz

1,04



1,15



1,24



3,78



1,0



1,0



1,1



3,7



3,29 kHz

1,04



1,30



1,70



8,02



1,0



1,1



1,5



7,8



13,3 kHz

1,04



2,63



5,04



31,5



1,0



2,3



4,7



31,4



100

1000

10000

100000

f [Hz]

[

Ω

]

Re1

Re2

Re3

Re4

Содержание MI 3290

Страница 1: ...Earth Analyser MI 3290 Instruction manual Version 1 3 4 Code No 20 752 597...

Страница 2: ...on your equipment certifies that it meets requirements of all subjected EU regulations 2018 METREL The trade names Metrel Smartec Eurotest Auto Sequence are trademarks registered in Europe and other c...

Страница 3: ...rth Analyser its key features functionalities and use It is intended for technically qualified personnel responsible for the product and its use Please note that LCD screenshots in this document may d...

Страница 4: ...stures 20 6 3 Virtual keyboard 21 6 4 Display and sound 22 6 4 1 Battery and time indication 22 6 4 2 Messages 22 6 4 3 Sound indication 24 6 4 4 Terminal voltage monitor 24 6 4 5 Help screens 25 7 Ma...

Страница 5: ...l Test screens 64 10 1 7 Single test Visual Test start screen 64 10 1 8 Single test Visual Test screen during test 65 10 1 9 Single test Visual Test result screen 66 10 1 10 Single test Visual Test me...

Страница 6: ...ep by step executions of Auto Sequence 121 12 2 3 Auto Sequence result screen 122 12 2 4 Auto sequence memory screen 124 13 Communication 125 14 Maintenance 126 14 1 Cleaning 126 14 2 Periodic calibra...

Страница 7: ...ent through clamps 141 15 11 Influence of noise 142 15 11 1 Digital filtering technique 143 15 12 Sub results in measurement functions 143 15 13 General data 144 Appendix A Structure objects 145 Appen...

Страница 8: ...lay with touch screen offers easy to read results and all associated parameters The operation is straightforward and clear to enable the user to operate the instrument without the need for special tra...

Страница 9: ...quipment or any of the accessories if any damage is noticed Consider all generally known precautions in order to avoid risk of electric shock while dealing with hazardous voltages Do not connect the t...

Страница 10: ...ation that a circuit is safe to touch A voltage measurement is necessary to know if a circuit is hazardous Warnings related to Batteries Use only batteries provided by the manufacturer Never dispose o...

Страница 11: ...wer supply is connected to the instrument The power supply socket is shown in Figure 2 2 Internal circuit controls CC CV charging and assures maximum battery lifetime Nominal operating time is declare...

Страница 12: ...t ICH 8 1 8 of the charging current 2 2 1 Precharge On power up if the battery voltage is below the VLOWV threshold the charger applies 1 8 of the charging current to the battery The precharge feature...

Страница 13: ...ld typ 0 C TWARM Warm temperature threshold typ 60 C THTF Hot temperature threshold typ 75 C The charger continuously monitors battery temperature To initiate a charge cycle the battery temperature mu...

Страница 14: ...fore storage Charge the instrument battery pack to approximately 50 of capacity at least once every 6 months Transportation Always check all applicable local national and international regulations bef...

Страница 15: ...o 1000 V a c and 1500 V d c Equipment for testing measuring or monitoring of protective measures Part 5 Resistance to earth IEEE 80 2000 IEEE Guide for Safety in AC Substation Grounding IEEE 81 2012 I...

Страница 16: ...ex clamp current If_sum If1 If2 If3 If4 Uh V Uh voltage H terminal Us V Us voltage S terminal Ues V Ues voltage ES terminal Ig_w A Overhead ground wire current Ig_w Igen If_sum R Complex number real n...

Страница 17: ...4 1 below Figure 4 1 The operator s panel 1 Colour TFT display with touch screen 2 GUARD Guard input terminal 3 H C1 Output terminal for the auxiliary earth electrode 4 S P1 Output terminal for a pro...

Страница 18: ...ndard USB connector type B 14 Input power supply socket type C7 Warnings Do not connect test terminals H S ES E to an external voltage higher than 300 V DC or AC CAT IV environment to prevent any dama...

Страница 19: ...z Selective and Passive Flex Clamps 1 4 Wenner and Schlumberger method Impulse Measurement Meter 200 mA and 7 mA Impedance Meter Potential and S T Current Source Pylon Ground Wire Test Iron Clamp Mete...

Страница 20: ...or 10 s or more The instrument automatically turns off 10 minutes after the last key was pressed Tab key is used to expand column in control panel Run key is used to start and stop the measurements 6...

Страница 21: ...alphabetic characters keyboard layout selected Backspace Clears last character or all characters if selected If held for 2 s all characters are selected Enter confirms new text Activates numeric symbo...

Страница 22: ...d battery inserted Time indication hh mm 6 4 2 Messages In the message field warnings and messages are displayed Conditions on the input terminals allow starting the measurement consider other display...

Страница 23: ...started Limit 50 Vrms H E S E ES E H Guard S Guard ES Guard The measuring range of the instrument is exceeded Measurement will not be started or displayed High electrical noise was detected during me...

Страница 24: ...pared against the limit Result is validated only if it is within the given limit Limit indication is shown in the test parameter window Message window Measurement result is inside pre set limits PASS...

Страница 25: ...ions The Help menu contains schematic diagrams for illustrating proper connection of the instrument to the test object After selecting the measurement you want to perform press the HELP key in order t...

Страница 26: ...ith single tests see chapter 11 Tests and Measurements for more information Auto Sequences Menu with customized test sequences see chapter 12 Auto Sequences for more information Memory Organizer Menu...

Страница 27: ...ion Workspace Manager Manipulation with project files Refer to chapter 8 9 Workspace manager for more information Auto Sequence groups Manipulation with lists of Auto Sequences Refer to chapter 8 8 Au...

Страница 28: ...options for decreasing power consumption can be set Figure 8 3 Power save menu Brightness Setting level of LCD brightness level LCD off time Setting LCD off after set time interval LCD is switched on...

Страница 29: ...easuring settings regarding to the scope of work or country it is used These specific settings are stored in instrument profiles By default each instrument has at least one profile activated Proper li...

Страница 30: ...5 Settings In this menu different general parameters can be set Figure 8 6 Settings menu Available selection Description Keys touch sound ON OFF Enables disables sound when using keys and touch scree...

Страница 31: ...ed settings will be lost when setting the instruments to initial settings Measurement limits and parameters Parameters and settings in General settings menu Applying the initial settings will re boot...

Страница 32: ...isplayed Only one list can be opened in the instrument at the same time The list selected in the Auto Sequence groups menu will be opened in the Auto Sequence main menu Figure 8 9 Auto Sequence groups...

Страница 33: ...a list Selected list of Auto Sequences is marked with a blue dot Note Previously selected list of Auto Sequences is closed automatically 8 8 4 Deleting a list of Auto Sequences Procedure A list of Aut...

Страница 34: ...ports are stored on directory EXPORTS Export files can be read by Metrel applications that run on other devices Exports are suitable for making backups of important works To work on the instrument an...

Страница 35: ...g a Workspace for more information Deletes the selected Workspace Refer to chapter 8 9 7 Deleting a Workspace Export for more information Adds a new Workspace Refer to chapter 8 9 5 Adding a new Works...

Страница 36: ...ocedure New Workspaces can be added from the Workspace Manager screen Enters option for adding a new Workspace Keypad for entering name of a new Workspace is displayed after selecting New After confir...

Страница 37: ...pened Workspace is marked with a blue dot The previously opened Workspace will close automatically 8 9 7 Deleting a Workspace Export Procedure Workspace Export to be deleted should be selected from th...

Страница 38: ...ist Enters option Import Before the import of the selected file the user is asked for confirmation The Imported Export file is added to the list of Workspaces Note If a Workspace with the same name al...

Страница 39: ...exporting the selected Workspace the user is asked for confirmation Workspace is exported to Export file and is added to the list of Exports Note If an Export file with the same name already exists t...

Страница 40: ...ended to change factory set administrator password after first use If the custom password is forgotten the second administrator password can be used This password always unlocks the Account manager an...

Страница 41: ...file menu The account manager password must be entered and confirmed first Administrator password consists of letters and or numbers Letters are case sensitive The default password is ADMIN 8 10 2 Cha...

Страница 42: ...nu is accessed by selecting Account manager in Sign in menu or User profile menu The account manager password must be entered and confirmed first The default password is ADMIN Field for setting if sig...

Страница 43: ...should be entered and confirmed Enters menu for editing user accounts Figure 8 16 Edit accounts menu Options Opens the window for adding a new user In the Add New window the name and initial password...

Страница 44: ...A Structure objects Figure 9 1 Default tree structure and its hierarchy 9 1 1 Measurement statuses Each measurement has a status Pass or Fail or no status a name results limits and parameters A measur...

Страница 45: ...project in tree menu 9 1 3 Measurement status indication under the Structure item Overall status of measurements under each structure item sub item can be seen without spreading tree menu This feature...

Страница 46: ...t memory screen Starts a new measurement The instrument goes to the measurement start screen Clones the measurement The selected measurement can be copied as an empty measurement under the same Struct...

Страница 47: ...surement The instrument goes to the menu for adding measurement into structure Refer to chapter 9 1 4 5 Add a new measurement for more information Adds a new Structure item A new Structure item can be...

Страница 48: ...ss tab key followed by enter key to enter menu for editing parameters Procedure Select structure item to be edited Select Parameters in Control panel Example of Parameters menu In menu for editing par...

Страница 49: ...ructure item This menu is intended to add new structure item in the tree menu A new structure item can be selected and then added in the tree menu Procedure Default initial structure Select Add Struct...

Страница 50: ...Control panel Add new measurement menu a Type of test can be selected from this field Options Single Tests Auto Sequence Tap on field or press the enter key to modify b Last added measurement is offer...

Страница 51: ...ginal Procedure Select the structure item to be cloned Select Clone in Control panel The Clone Structure menu is displayed Sub elements of the selected structure item can be marked or un marked for cl...

Страница 52: ...Procedure Select the measurement to be cloned Select Clone in Control panel A new empty measurement is displayed 9 1 4 8 Copy Paste a Structure item In this menu selected Structure item can be copied...

Страница 53: ...w structure item is displayed Note The Paste command can be executed one or more times 9 1 4 9 Cloning and Pasting sub elements of selected structure item When structure item is selected to be cloned...

Страница 54: ...copied Select Copy in Control panel Select the location where measurement should be pasted Select Paste in Control panel A new empty measurement is displayed in selected Structure item Note The Paste...

Страница 55: ...ns to the tree menu without changes Structure without deleted structure item 9 1 4 12 Delete a measurement In this menu selected measurement can be deleted Procedure Select a measurement to be deleted...

Страница 56: ...dure Select the structure item to be renamed Select Rename in Control panel Virtual keypad will appear on screen Enter new text and confirm Refer to chapter 6 3 Virtual keyboard for keypad operation S...

Страница 57: ...starting screen is displayed a Parameters and limits can be viewed and edited Select Run in Control panel to retest the measurement Results sub results after re run of recalled measurement Select Sav...

Страница 58: ...10 1 Selection modes In Single tests main menu four modes for selecting single tests are available Options All A single test can be selected from a list of all single tests The single tests are always...

Страница 59: ...ys 10 1 1 Single test screens In the Single test screens measuring results sub results limits and parameters of the measurement are displayed In addition on line statuses warnings and other info are d...

Страница 60: ...arameters and limits of single tests Procedure Select the test or measurement The test can be entered from Single tests menu or Memory organizer menu once the empty measurement was created under selec...

Страница 61: ...le test main menu saving under the last selected Structure object will be offered by default The user can select another Structure object or create a new Structure object By pressing the key in Memory...

Страница 62: ...ng on Enters cross selector to select test or measurement 10 1 4 Graph view Figure 10 3 Graph result screen Example of 4 pole sweep measurement Options Plot edit Opens control panel for editing graphs...

Страница 63: ...ts Options Retest Enters starting screen for a new measurement Opens menu for changing parameters and limits of selected measurements Refer to chapter 10 1 2 Setting parameters and limits of single te...

Страница 64: ...ine statuses and other information are displayed Item Child item Status fields Options Selected Visual Test Overall status Figure 10 5 Visual Test screen organisation 10 1 7 Single test Visual Test st...

Страница 65: ...een during test Options during test Selects item Applies a pass to the selected item or group of items Applies a fail to the selected item or group of items Clears status in selected item or group of...

Страница 66: ...ngle test main menu Saving under the last selected Structure object will be offered by default The user can select another Structure object or create a new Structure object By pressing the key in Memo...

Страница 67: ...ser Single Tests 67 10 1 10 Single test Visual Test memory screen Figure 10 9 Visual Test memory screen Options Retest Enters starting screen and starts the new Visual test Set cursor for viewing data...

Страница 68: ...prior Pass Fail Clear Checked 3 Remote probes and test leads are under continuous observation Pass Fail Clear Checked Table 11 2 Visual Test Safety Precautions Before Test Safety Hazards During Test...

Страница 69: ...mitigated by the physical orientation of test leads grounding or both Pass Fail Clear Checked 2 Surge arrester ground continuity tests precautions The base of the surge arrester can approach line pote...

Страница 70: ...e is selected by the operator depending on the particular earthing system to be tested Earth Measurement Test Mode Graph LF HF Filter Test Voltage Impedance Resistance Ze Re 2 pole single sweep Ze f 5...

Страница 71: ...ugh an auxiliary probe H The impedance of the auxiliary probe H should be as low as possible The impedance Rc can be decreased by using more probes in parallel or using an auxiliary earthing system as...

Страница 72: ...t the 2 pole measurement function Set the test parameters mode voltage frequency distance and limit Connect the test leads to the instrument and to the test object Press the Run key to start the measu...

Страница 73: ...ance of the auxiliary probe H should be as low as possible in order to inject a high test current The impedance Rc can be decreased by using more probes in parallel A higher injected current improves...

Страница 74: ...surement function Set the test parameters mode voltage frequency distance and limit Connect the test leads to the instrument and to the test object Press the Run key to start the measurement Wait unti...

Страница 75: ...order to inject a high test current The impedance Rc can be decreased by using more probes in parallel A higher injected current improves the immunity against spurious earth currents The differential...

Страница 76: ...surement function Set the test parameters mode voltage frequency distance and limit Connect the test leads to the instrument and to the test object Press the Run key to start the measurement Wait unti...

Страница 77: ...sing more probes in parallel A higher injected current improves the immunity against spurious earth currents The voltage drop is measured by auxiliary potential probe S and ES terminal The selective c...

Страница 78: ...ction Set the test parameters mode clamp type frequency distance and limit Connect the test leads and clamp to the instrument and to the test object Press the Run key to start the measurement Wait unt...

Страница 79: ...cts a voltage in the earthing system The injected voltage generates a test current in the loop If the total loop earth impedance of the electrodes Ze1 Ze2 Ze3 and Ze4 connected in parallel is much low...

Страница 80: ...generator clamp type A1019 Limit Ze Limit value selection OFF 0 1 40 2 Clamps Measurement procedure Select the 2 Clamps measurement function Set the test parameters clamp type frequency and limit Con...

Страница 81: ...3290 Earth Analyser Guard Rp G V A S probe H auxiliary earth rod Rc 25 kHz shielded cable tower nex tower overhead grounding wire Igw Re Igw LGW nex tower Ie R GW LGW Ih Figure 11 27 HF Earth Resista...

Страница 82: ...t the following parameters SER PAR Model Distance and Limit Re can be edited Figure 11 29 HF Earth Resistance 25 kHz measurement menu Test parameters for HF Earth Resistance 25 kHz SER PAR Model Set d...

Страница 83: ...m the measured object Note to SER PAR Model parameter Example Series Activates the series equivalent circuit model Re value is derivate based on the series model Test objects description and schematic...

Страница 84: ...possible in order to inject a high test current The impedance Rc can be decreased by using more probes in parallel A higher injected current improves the immunity against spurious earth currents The...

Страница 85: ...f turns F3 Set the number of turns for Flex 3 input terminal 1 2 3 4 5 6 Number of turns F4 Set the number of turns for Flex 4 input terminal 1 2 3 4 5 6 Distance r Distance between E and S probe user...

Страница 86: ...window 11 2 8 Passive Flex Clamps Measurement The passive measuring method is using the Inductive current or grounding wire current Igw flowing in the earthing system to determine the selected earth...

Страница 87: ...istance and Limit Ztot can be edited Figure 11 38 Passive Flex Clamps measurement menu Test parameters for Passive Flex Clamps Number of turns F1 Set the number of turns for Flex 1 input terminal 1 2...

Страница 88: ...uld influence the measurement results The tester displays the noise warning in this case Note Probe Probes must be placed at a sufficient distance from the measured object Notes Flex When using only o...

Страница 89: ...FFT 20 40 V Schlumberger Method single m ft yes FFT 20 40 V Table 11 41 Available Specific Earth Resistance measurements in the MI 3290 11 3 1 General on specific earth What is Specific Earth Resistan...

Страница 90: ...m and 49 9 m Connect the cables to the probes then to terminals H S ES and E E a r t h H S ES E MI 3290 Earth Analyser a G V A S probe ES probe E probe H probe a a b Figure 11 43 Wenner method example...

Страница 91: ...the Wenner method measurement function Set the test parameters voltage distance and limit Connect the test leads to the instrument and to the test object Press the Run key to start the measurement Wa...

Страница 92: ...ance d must be between 0 1 m and 49 9 m and the distance a must be a 2 d Connect the cables to the probes then to terminals H S ES and E E a r t h H S ES E MI 3290 Earth Analyser a G V A S probe ES pr...

Страница 93: ...Schlumberger method Measurement procedure Select the Schlumberger method measurement function Set the test parameters voltage distances and limit Connect the test leads to the instrument and to the te...

Страница 94: ...0 s shielded cable Figure 11 49 Impulse Measurement example During the measurement a current impulse 10 350 s is injected into the earth through an auxiliary probe H The impedance of the auxiliary pro...

Страница 95: ...ters distance and limit Connect the test leads to the instrument and to the test object Press the Run key to start the measurement Wait until the test result is displayed on the screen Save results op...

Страница 96: ...The resistance measurement is performed with DC current of 200 mA Idc C1 C2 MI 3290 Earth Analyser G V A Rx 2 wire Figure 11 53 Meter 200 mA example 2 wires In the example following resistance is meas...

Страница 97: ...general this function serves as standard meter with a low testing current The measurement is performed continuously without polarity reversal This function can also be applied for testing continuity o...

Страница 98: ...hapter describes how to compensate test leads resistance in both continuity functions Meter 200 mA and 7 mA Compensation is required in 2 wire mode to eliminate the influence of test leads resistance...

Страница 99: ...0 A graphical representation of the complex impedance plane 11 6 1 Impedance Meter Measurement C1 P1 P2 C2 MI 3290 Earth Analyser G Vac Aac Zx 4 wire Kelvin Iac R R jX jX Series Parallel Figure 11 61...

Страница 100: ...t voltage 20 V or 40 V SER PAR Model Set desired model Series or Parallel Limit Z Limit value selection OFF 1 15 0 k single test mode only Impedance Meter measurement procedure Select the Impedance Me...

Страница 101: ...ectrode grid in the ground Fault currents close to power distribution objects substations distribution towers plants can be very high up to 200 kA This can result in dangerous step and contact voltage...

Страница 102: ...e probes in parallel A higher injected current improves the immunity against spurious earth currents The voltage drop is measured by auxiliary potential probe S where US Potential voltage normalized t...

Страница 103: ...uency Set test frequency 55 Hz 82 Hz 94 Hz 105 Hz 111 Hz 128 Hz 164 Hz 329 Hz Latitude Enter the latitude point user defined DD Decimal degrees Longitude Enter the longitude point user defined DD Deci...

Страница 104: ...easurement and goes to the result screen Figure 11 74 Example of Potential measurement result screen Figure 11 75 Example of Potential measurement graph view Potential measurement X Y and GPS procedur...

Страница 105: ...h noise currents and voltages in earth could influence the measurement results The tester displays the noise warning in this case Graph view is not available during the measurement Notes Probes High i...

Страница 106: ...dy resistance E a r t h Igen H E MI 3290 Earth Analyser G V A H auxiliary earth rod 5a a 1m 1k Metal plates MI 3295M Figure 11 78 Step Voltage example Touch Voltage The measurement is performed betwee...

Страница 107: ...red voltages must be up scaled according to following equation MI 3295M MI 3290 where Us t Calculated Step or Touch Voltage in case of an fault current Um Test voltage drop MI 3295M V meter Ifault Set...

Страница 108: ...e Wire Test PGWT example During the measurement a sinusoidal current Igen is injected into the earth through an auxiliary probe H The resistance of the auxiliary probe H should be as low as possible i...

Страница 109: ...Test function Set the test parameters mode frequency number of turns 1 4 Connect the test leads and flex clamps to the instrument and to the test object Press the Run key to start the measurement Wait...

Страница 110: ...Available Current RMS measurements in the MI 3290 Iron Clamp Meter RMS This function is intended for measurement of AC currents leakage currents loads currents noise currents using iron current clamp...

Страница 111: ...lamp type Set clamp type A1018 Limit Ic Limit value selection OFF 10 mA 9 00 A Iron Clamp Meter RMS measurement procedure Select the Iron Clamp Meter RMS measurement function Set the test parameter cl...

Страница 112: ...t terminal 1 2 3 4 5 6 Flex Clamp Meter RMS Measurement procedure Select the Flex Clamp Meter RMS measurement function Set the test parameters number of turns 1 4 Connect the flex clamps to the instru...

Страница 113: ...be E a r t h H S ES E V V Figure 11 95 Voltage Meter RMS example 11 10 1 Voltage Meter RMS Measurement Test can be started from the Voltage Meter RMS measurement window Figure 11 96 Example of Voltage...

Страница 114: ...ailable Checkbox measurements in the MI 3290 Note The Checkbox feature should be used to ensure that the meter is reading correctly between calibrations but should not be regarded as a substitute for...

Страница 115: ...easurement menu Figure 11 103 Example of Check V Meter measurement result Test parameters for Check V Meter Test Voltage Set test voltage 20 V or 40 V Test Frequency Set test frequency 55 Hz 82 Hz 94...

Страница 116: ...eck A Meter measurement menu Figure 11 106 Example of Check A Meter measurement result Test parameters for Check A Meter Test Voltage Set test voltage 20 V or 40 V Test Frequency Set test frequency 55...

Страница 117: ...2 input terminal 1 2 3 4 5 6 Number of turns F3 Set the number of turns for Flex 3 input terminal 1 2 3 4 5 6 Number of turns F4 Set the number of turns for Flex 4 input terminal 1 2 3 4 5 6 Check Iro...

Страница 118: ...e changed set 12 1 Selection of Auto Sequence The Auto Sequence list from Auto Sequence groups menu should be selected first Refer to chapter 8 8 Auto Sequence groups for more details The Auto Sequenc...

Страница 119: ...ow commands After the test sequence is finished the Auto Sequence result menu is shown Details of individual tests can be viewed and the results can be saved to Memory organizer 12 2 1 Auto Sequence v...

Страница 120: ...parameters and limits of selected measurements Refer to chapter 10 1 2 Setting parameters and limits of single tests for more information how to change measurement parameters and limits Indication of...

Страница 121: ...low commands Figure 12 4 Auto Sequence example of a pause with message text or picture Figure 12 5 Auto Sequence example of a finished measurement with options for proceeding Options during execution...

Страница 122: ...instrument goes to menu for viewing details of the Auto Sequence Saves the Auto Sequence results A new Auto Sequence was selected and started from a Structure object in the structure tree The Auto Seq...

Страница 123: ...t in Auto Sequence are displayed on Opens menu for viewing parameters and limits of selected measurements Refer to chapter 10 1 2 Setting parameters and limits of single tests for more information Fig...

Страница 124: ...o Sequence memory screen details of the saved Auto Sequence can be viewed and a new Auto Sequence can be restarted Figure 12 9 Auto Sequence memory screen Options Retest the Auto Sequence Enters menu...

Страница 125: ...all the correct USB driver see notes The instrument is prepared to communicate with the PC over USB Bluetooth communication The internal Bluetooth module enables easy communication via Bluetooth with...

Страница 126: ...is regularly calibrated in order that the technical specification listed in this manual is guaranteed We recommend an annual calibration Only an authorized technical person can do the calibration Plea...

Страница 127: ...659 Hz 1 31 kHz 1 50 kHz 2 63 kHz 3 29 kHz 6 59 kHz 13 1 kHz 15 0kHz Short circuit test current 220 mA 164 Hz 40 Vac Limit range Ze 0 1 5 k OFF Test voltage shape sine wave Ze definition Impedance va...

Страница 128: ...rcuit test current 220 mA 164 Hz 40 Vac Limit range Zsel 0 1 5 k OFF Test voltage shape sine wave Zsel definition Impedance value Z f Measuring time see Table 15 2 Measurement Clamp type A1018 Automat...

Страница 129: ...c test of voltage noise yes Low clamp current indication yes Ic Typical loop test current Loop Impedances Test frequency 10 m 100 m 500 m 1 5 10 164 Hz 6 8 A 0 36 A 80 mA 40 mA 8 mA 4 mA Table 15 1 Ty...

Страница 130: ...z Short circuit test current 40 mA Limit range Re 1 100 OFF Test voltage shape sine wave Re definition Impedance excluding the reactance value Measuring time typical 10 s Automatic test of probe resis...

Страница 131: ...z 40 Vac Limit range Ztot 0 1 5 k OFF Test voltage shape sine wave Ztot definition Impedance value Z f Measuring time see Table 15 2 Automatic test of probe resistance yes Automatic connection test ye...

Страница 132: ...ed value consider uncertainty of 4 pole measurement 20 0 ft 199 9 ft 0 1 ft 200 ft 999 ft 1 ft 1 000 k ft 1 999 k ft 0 001 k ft 2 00 k ft 19 99 k ft 0 01 k ft 20 0 k ft 199 9 k ft 0 1 k ft 200 k ft 99...

Страница 133: ...stance S 1 2 M Ifault range selectable 1 A 200 kA Measuring time see Table 15 2 3 pole Automatic test of probe resistance yes Automatic connection test yes H S E Automatic range selection yes Automati...

Страница 134: ...voltage noise yes Guard terminal yes Influence of the auxiliary electrodes The current probe Rc and potential probe Rp are measured using 3 Pole measurement at a fix frequency 3 29 kHz 40 Vac open ter...

Страница 135: ...en terminal test voltage 20 Vdc Short circuit test current min 200 mAdc into load resistance of 2 Test current direction unidirectional Max inductivity 2 H Limit range R 0 1 40 OFF Measuring time typi...

Страница 136: ...continuous Open terminal test voltage 20 Vdc Short circuit test current 7 2 mAdc Test current direction unidirectional Limit range R 1 15 0 k OFF Measuring refresh rate typical 2 s Test method 2 wire...

Страница 137: ...0 s at 164 Hz depending on test frequency Test method 4 wire Rc1 Rc2 5 max Rp1 Rp2 5 max Automatic connection test yes C1 P1 P2 C2 Automatic range selection yes Automatic test of voltage noise yes 15...

Страница 138: ...uncertainty for one turn except for the measurement range of 10 mA 99 9 mA which must be at least 3 turns Do not measure close to other current carrying conductors if possible An external magnetic fi...

Страница 139: ...esolution Uncertainty f 40 Hz 999 Hz 1 Hz 0 2 of reading 1 digit 1 00 kHz 4 50 kHz 10 Hz Test mode continuous Input resistance H E 1 2 M Input resistance S E 1 2 M Input resistance ES E 1 2 M Measurin...

Страница 140: ...9 Hz 250 1 k Ra 250 500 Ra 25 k 15 of reading 1 31 kHz 2 63 kHz 100 500 Ra 50 250 Ra 12 5 k 15 of reading 3 29 kHz 6 59 kHz 100 250 Ra 50 125 Ra 6 25 k 15 of reading 13 1 kHz 15 0 kHz 50 150 Ra 50 50...

Страница 141: ...ee Notes 10 of reading 3 digits If the low current limit is exceeded by an additional 70 Ic 0 3 mA and If1 4 1 5 mA then the main measuring result is disabled Standard uncertainty Additional uncertain...

Страница 142: ...Hz 55 Hz 50 dB 82 Hz 25 0 kHz 80 dB 50 Hz 55 Hz 50 dB 82 Hz 25 0 kHz 80 dB 16 2 3 Hz 55 Hz 25 0 kHz 80 dB d c 55 Hz 25 0 kHz 80 dB Measurement function 2 Clamps Max noise interference current through...

Страница 143: ...any other frequencies Inoise So frequencies different from the measurement frequency will not influence on the measurement result 15 12 Sub results in measurement functions Sub result Measuring range...

Страница 144: ...ay with touch screen Reference conditions Reference temperature range 25 C 5 C Reference humidity range 40 RH 60 RH Operation conditions Working temperature range 10 C 50 C Maximum relative humidity 9...

Страница 145: ...ation name description location type nominal power nominal voltage GPS Power Station name description location type nominal power GPS Transmission Tower name description location type material type no...

Страница 146: ...ance 25 kHz Earth Selective Flex Clamps 1 4 Earth Passive Flex Clamps 1 4 Earth Wenner method Specific Schlumberger method Specific Impulse Measurement Pulse Meter 200 mA DC R Meter 7 mA DC R Impedanc...

Страница 147: ...is connected to the earthing electrode rod Probe H serves to close the measuring loop The voltage between probe S and E is the voltage drop on the measured resistance Correct placing of probes is ess...

Страница 148: ...ment of test probes A measurement with three placements of test probe S S S S is intended to verify that the selected distance d1 is long enough Distance from tested earthing electrode system E ES to...

Страница 149: ...nd the d1 should be increased Notes Initial uncertainty of measured resistance to earth depends on distance between electrodes d1 and size of earthing electrode a It can be seen in Table C 4 d1 a Unce...

Страница 150: ...nt placements of test probes The test probes shall be placed in the opposite direction from tested electrode 180 or at least 90 Test probe resistances In general test probes should have a low resistan...

Страница 151: ...Oscilloscope screenshot Re1 Figure D 2 Oscilloscope screenshot Re2 Figure D 3 Oscilloscope screenshot Re3 Figure D 4 Oscilloscope screenshot Re4 3 pole measurement results 3 pole Re Calculated impedan...

Страница 152: ...PC SW Auto Sequence Editor workspace is divided in four main areas On the left side structure of selected group of Auto Sequence is displayed In the middle part of the workspace the elements of the se...

Страница 153: ...n a file More files can be opened simultaneously in Auto Sequence Editor Within Group of Auto Sequences tree structure can be organized with folders subfolders containing Auto Sequences The three stru...

Страница 154: ...ion options also available by right clicking on Folder or Auto Sequence Adds a new folder subfolder to the group Adds a new Auto Sequence to the group Deletes the selected Auto Sequence the selected f...

Страница 155: ...name of Auto Sequence Description Any text for additional description of Auto Sequence can be entered Image Image presenting Auto sequence measuring arrangement can be entered or deleted Enters menu...

Страница 156: ...ingle tests are the same as in Metrel ES Manager Measurement menu Limits and parameters of the measurements can be set Results and sub results can t be set Flow commands Flow commands are used to cont...

Страница 157: ...urement step flow command can be copied and pasted above selected location on the same or on another Auto Sequence Copy Paste after A measurement step flow command can be copied and pasted under selec...

Страница 158: ...t measurement Parameters State On enables Buzzer mode Off disables Buzzer mode Operation after end of test This flow command controls the proceeding of the Auto Sequence in regard to the measurement r...

Страница 159: ...rrent If_sum has to be measured separately with the method as described in IEEE 81 2012 Ch 8 2 2 6 and implemented in MI 3290 Earth Analyser measurements with multiple flex clamps The following relati...

Страница 160: ...values the user has to decide which position he will use for the measurement the S probe has to be positioned to the selected balanced position and then the actual measurement with the flex clamps ca...

Страница 161: ...ng Example The flex clamp s have to be positioned first and then the parameters have to be entered Balancing is enabled only in single Test Mode The appropriate values for number of flex turns have to...

Страница 162: ...ng procedure 162 Balancing procedure ends with two results r1 and r2 Select one with or and commit with the selected result Results must be in the range of 1 1000 to be valid The selected result is au...

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METREL MI 3290, Инструкция по эксплуатации

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