Megger digiPHONE+2 User Manual
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Megger digiPHONE+2 User Manual

Megger digiPHONE+2 User Manual

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digiPHONE+2
digiPHONE+2 NT
digiPHONE+2 NTRX
USER GUIDE
Issue:
C (11/2021) - EN
Article number:
87047
1

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  • Page 1 NT digiPHONE+2 NTRX USER GUIDE Issue: C (11/2021) - EN Article number: 87047...

  • Page 3: Consultation With Megger

    The information in this document is subject to change without notice and should not be construed as a commitment by Megger. Megger cannot be made liable for technical or printing errors or shortcomings of this handbook. Megger also disclaims all responsibility for damage resulting...

  • Page 4: Terms Of Warranty

    Each component and product replaced in accordance with this warranty becomes the property of Megger. All warranty claims versus Megger are hereby limited to a period of 12 months from the date of delivery. Each component supplied by Megger within the context of warranty will also be covered by this warranty for the remaining period of time but for 90 days at least.

  • Page 5: Table Of Contents

    Contents Contents Consultation with Megger ....................3 Terms of Warranty ......................4 Contents ........................... 5 Basic notes ....................... 7 Technical description ..................9 System description ..................... 9 Technical data ....................13 Connections and controls on the indicator unit ..........16 Basic operation of the indicator unit ............
  • Page 6 Contents 5.3.4 Clear identification of the line on the basis of the current flow direction (only possible with SignalSelect-modulated signal) ..........56 5.3.5 Depth measurement ..................58 5.3.6 Line tracing ....................... 61 5.3.7 Terrain examination ..................63 Locating probes ....................64 Locating faults and sleeves ................

  • Page 7: Basic Notes

    It is important to observe the generally applicable electrical regulations of the country in Working with products from Megger which the device will be installed and operated, as well as the current national accident prevention regulations and internal company directives (work, operating and safety regulations).
  • Page 8 Basic notes Repair and maintenance work may only be performed by Megger or authorised service Repair and partners. Megger recommends having the system tested and maintained at a Megger maintenance service centre once per annum. Megger also offers its customers on-site service. Please contact your service centre as needed.

  • Page 9: Technical Description

    Technical description Technical description System description The indicator unit can be used for different measuring tasks depending on the measuring Description accessories connected. Which of the following sensors and antennas actually belong to the delivery (see page 9) depends on the set purchased: Surge wave receiver DPP-SU2 for the accurate pinpointing of flashover faults in buried cables A discharge generator feeds surge voltage pulses into the end of the...
  • Page 10 Technical description Depending on the connected measuring accessories, the indicator unit starts in different Features modes, which are characterized by the following features: Ferrolux mode - Different locating methods (minimum, maximum, super-maximum) • • Display of the path of the line •...
  • Page 11 Technical description Included in delivery Depending on the set purchased, the scope of delivery of the system includes at least the following components: Component digiPHONE+2 digiPHONE+2 NT digiPHONE+2 Item number NTRX Indicator unit 1012816 Digiphone sensor and accessories DPP-SU sensor...
  • Page 12 Caution: To retrofit this set, the indicator unit must be sent to the manufacturer. Optional accessories The following optional accessories can also be ordered from Megger sales: Accessory Description Item number Identification Mini antenna for cable identification...

  • Page 13: Technical Data

    Technical description Technical data The indicator unit is defined by the following technical parameters: Indicator unit Parameter Value Power supply 6 x AA batteries, type IEC R6 (alkaline manganese) Operating time >15 hours Voltmeter (Only with ESG mode enabled) Input resistance 650 kΩ...
  • Page 14 Technical description Receiver iFS The iFS receiver is defined by the following parameters: Parameter Value Reception frequencies Passive 50 Hz / 60 Hz / 100 Hz / 120 Hz / 15 … 23 kHz • Active 480 Hz / 491 Hz / 512 Hz / 640 Hz / 982 Hz / 1090 Hz / •...
  • Page 15 Technical description The identification antenna is defined by the following parameters: Identification antenna IFA (optional) Parameter Value Reception frequencies Passive 50 Hz / 60 Hz / 100 Hz / 120 Hz / 15 … 23 kHz • Active 480 Hz / 491 Hz / 512 Hz / 640 Hz / 982 Hz / 1090 Hz / •...

  • Page 16: Connections And Controls On The Indicator Unit

    Technical description Connections and controls on the indicator unit The following illustration shows the connections and controls on the indicator unit: Element Description Display Knob Function key 2 Earth spike connection sockets Maximum input voltage: 60 VDC/42 VAC peak Sensor socket / receiver connection Function key 1 Indicator unit on/off (when pressed and held), Backlighting on/off (when pressed briefly),...

  • Page 17: Basic Operation Of The Indicator Unit

    Basic operation of the indicator unit Basic operation of the indicator unit Before switching on, the indicator unit must be connected to the measurement accessory Switching on the that is required for the intended use. Then the indicator unit can be switched on by briefly indicator unit pressing the button.
  • Page 18 Basic operation of the indicator unit After switching on the device, you should check the battery status immediately using the Battery test charging bar in the top right corner of the display. If the bar is barely filled, it is advisable to carry replacement batteries. As of a residual capacity of about 20%, both the battery status indicator and the LED in the button illuminate in red.

  • Page 19: Pinpointing Cable Faults In "Digiphone" Mode

    Pinpointing Cable Faults in “Digiphone” Mode Pinpointing Cable Faults in “Digiphone” Mode If the volume limiter is deactivated, when listening to flashover noise, additional airborne sound and excessive amplification can lead to dangerous sound levels in the headphones! CAUTION Preparatory Measures 4.1.1 Starting Up the Surge Wave Generator To pinpoint a cable fault, a surge wave generator is needed.

  • Page 20: Preparing The Sensor

    Pinpointing Cable Faults in “Digiphone” Mode 4.1.2 Preparing the Sensor Three different probes are supplied with the sensor as standard (two sensor rods and one Fitting a suitable probe 3-point foot). They can be screwed onto the underside of the sensor to suit the ground on the sensor conditions.
  • Page 21 Pinpointing Cable Faults in “Digiphone” Mode Attaching / removing This is how to attach / remove the telescopic bar to / from the sensor: the telescopic handle Attachment Removal 90° 90° This is how to adjust the height of the telescopic handle: Adjusting the height of the telescopic handle...

  • Page 22: Connecting The Sensor And Headphones To The Indicator Unit

    Pinpointing Cable Faults in “Digiphone” Mode 4.1.3 Connecting the Sensor and Headphones to the Indicator Unit The coiled cable supplied is used to connect the sensor. Because the plug type and pin configuration match at both ends of the cable, you can choose any cable alignment. One end of the cable is connected to the socket on the indicator unit and the other end to the socket on the top of the sensor (see illustration).

  • Page 23: General Information On Operation

    Pinpointing Cable Faults in “Digiphone” Mode General information on operation Shortly after switching on, the measurement screen appears. The device is now ready Layout of the to measure. measurement screen In addition to the acoustic signal in the headphones, the measurement screen shows all relevant information that may be useful when approaching the cable fault during the pinpointing procedure: Active functions and...

  • Page 24: Adjusting The Settings

    Pinpointing Cable Faults in “Digiphone” Mode 4.2.1 Adjusting the Settings You can switch from the measurement screen to the menu screen at any time and Menu structure change any settings in two steps at most: measurement screen menu screen Each menu screen is made up as follows: Layout of the menu screens Non-active...

  • Page 25: 4.2.1.1 Adjusting The Basic Settings

    Pinpointing Cable Faults in “Digiphone” Mode 4.2.1.1 Adjusting the Basic Settings After the indicator unit has been switched on, you can adjust the basic settings. To do so, switch to the menu screen by pressing the knob and selecting the menu item .
  • Page 26 Pinpointing Cable Faults in “Digiphone” Mode Menu Description item F1 | F2 Using this menu item, the following functions can be assigned to the two function keys of the indicator unit: The device can be muted / unmuted by pressing the function key. Each press of the function key switches between the available filter settings (see page 27).

  • Page 27: 4.2.1.2 Adjusting The Measurement Settings

    Pinpointing Cable Faults in “Digiphone” Mode 4.2.1.2 Adjusting the Measurement Settings By pressing the knob, you can at any time switch from the measurement screen to the menu screen with the most important measurement settings: In this menu you can perform the following measurement settings: Menu Description item...
  • Page 28 Pinpointing Cable Faults in “Digiphone” Mode Flashover noise has its own varying sound characteristics. The sound propagation is Filter settings strongly affected by the environment through which the sound travels. The sound propagation speed and the distance to the sound source influence the frequencies received by the sensor.

  • Page 29: General Information On Locating Faults With The Device

    Pinpointing Cable Faults in “Digiphone” Mode General information on locating faults with the device 4.3.1 Interpreting the measured value and direction data The time difference values logged at the current position are always shown on the left- Measurement display hand side of the display. The values are shown either in grey or black according to the following agreement: The most recently taken measurement is The most recently taken measurement...
  • Page 30 Pinpointing Cable Faults in “Digiphone” Mode How to read the fault The fault arrow, which can be enabled or disabled through the menu item in the device arrow settings (see page 25), shows whether the user has moved towards or away from the fault.

  • Page 31: Volume Settings

    Pinpointing Cable Faults in “Digiphone” Mode 4.3.2 Volume Settings To protect the operator’s hearing from excessive sound levels, the volume regulator has Volume setting a number of protective mechanisms. The volume is regulated in the measurement screen by turning the knob. Quieter Louder The device settings can limit the maximum sound level to 84 dB(A) through the...
  • Page 32 Pinpointing Cable Faults in “Digiphone” Mode When background noise reduction (see page 27) is switched on, the software gathers How staying in one and analyses information about the interference and signal level. After the first surge pulse position affects from the fault arrives, this information is used to suppress the background noise. Further background noise information is gathered with each additional pulse and the reduction is constantly reduction...

  • Page 33: Switching Between Automatic And Manual Trigger Sensitivity Setting

    Pinpointing Cable Faults in “Digiphone” Mode 4.3.3 Switching between automatic and manual trigger sensitivity setting The trigger sensitivity (both for the electromagnetic pulse and the acoustic pulse) is Introduction automatically set to the optimal value determined by the software by default. If required, the setting can also be adjusted manually at any time.
  • Page 34 Pinpointing Cable Faults in “Digiphone” Mode If you would like to adjust the volume in the meantime or just don’t want to lose the Locking the trigger sensitivity level that is currently set by accidentally turning the knob, you can lock the sensitivity at a current setting by pressing the relevant function key a second time.

  • Page 35: Procedure For Fault Detection

    Pinpointing Cable Faults in “Digiphone” Mode Procedure for fault detection 4.4.1 Tracing the Line After prelocation, it is usually relatively easy to narrow down where the fault lies in the cable. If, however, the area is large because the cable plans are inaccurate, we recommend that you trace the cable with a line location device before pinpointing, and mark its route.

  • Page 36: Approaching The Fault

    Pinpointing Cable Faults in “Digiphone” Mode Step Action Slowly rotate the sensor in the pulse cycle until the green line is shown vertically in the display, i.e. the arrow on the sensor points towards the line routing. Move the sensor sideways in time with the pulses (crosswise to the cable route) until the indicator shows that it is exactly over the cable.
  • Page 37 Pinpointing Cable Faults in “Digiphone” Mode The following is an example of how the indicators (transit time / direction indicator) change Diagram as the operator nears and goes past the fault:...
  • Page 38 Pinpointing Cable Faults in “Digiphone” Mode This is what to do when approaching the fault: Procedure Step Action Place the sensor at the starting position (see page 35). If the sensor unit cannot pick up an acoustic signal at this position (the trigger symbol lights up), follow the route until there is an acoustic trigger.

  • Page 39: Completing The Work

    Pinpointing Cable Faults in “Digiphone” Mode Practical tips If you are unsure whether a noise is an acoustic flashover noise or just a repeating background noise, we recommend “resetting” background noise reduction by lifting the sensor briefly and putting it down again. If you then detect a similar noise again during magnetic triggering, it is very likely to be the acoustic flashover noise.

  • Page 40: Line And Probe Location In "Ferrolux" Mode

    Line and probe location in “Ferrolux” mode Line and probe location in “Ferrolux” mode Connecting the sensor and headphones to the display unit To operate the device in Ferrolux mode, one of the following two sensors must be connected to the socket of the indicator unit: Reader coil IFA for cable identification (see page 70)

  • Page 41: General Information About Operation

    Line and probe location in “Ferrolux” mode General information about operation Immediately after switching on, the measurement screen appears. The device is Layout of the immediately ready to measure. measurement screen The measurement screen provides all of the relevant information that could be useful for the locating the line or probe as well as the acoustic signal: Active functions Signal direction and...

  • Page 42: Entering Settings

    Line and probe location in “Ferrolux” mode 5.2.1 Entering settings It is possible to switch from the measurement screen to the menu screen at any time Menu layout and enter any setting with a maximum of two operating steps: Measurement screen Menu screens By principle, the individual menu screens have the following layout: Elements of the menu...

  • Page 43: 5.2.1.1 Entering Basic Settings

    Line and probe location in “Ferrolux” mode 5.2.1.1 Entering basic settings To access the basic settings for Ferrolux mode, the menu screen must be opened by pressing the knob and the menu item selected. The following menu then appears in the display: You can enter the following basic settings in this menu (the second menu level can be called up via menu item ...
  • Page 44 Line and probe location in “Ferrolux” mode Menu Description item F1 | F2 Using this menu item, the following functions can be assigned to the two function keys of the indicator unit: Each press of the function key switches between the available measurement methods (see page 45).

  • Page 45: 5.2.1.2 Entering Measurement Settings

    Line and probe location in “Ferrolux” mode 5.2.1.2 Entering measurement settings Pressing the knob allows you to exit the measurement screen and directly access the menu screen at any time, which contains the most important measurement settings: The following measurement settings can be entered in this screen: Menu Description item...
  • Page 46 Line and probe location in “Ferrolux” mode The available receivers support a large quantity of localizable frequencies. These is Selecting the frequency divided into passive and active frequencies. Passive frequencies are understood to be those frequencies which are already present on buried lines for operational reasons or are coupled into them inductively.
  • Page 47 Line and probe location in “Ferrolux” mode Select locating mode The iFS receiver can measure in three different locating modes. In each of these modes, the signals picked up by the antenna system are processed in different ways. This means that only the signal received by the vertically arranged antenna is evaluated in minimum mode, whereas the signals from different antennas are combined with each other in super max mode.

  • Page 48: Controlling Sensitivity

    Line and probe location in “Ferrolux” mode 5.2.2 Controlling sensitivity In order to always be able to display the received signals in an optimum way in the bar chart depending on the strength, the receiver can operate in different sensitivity ranges. The currently set sensitivity can be read in a bar directly beneath the bar chart.

  • Page 49: Recording And Managing Measurement Series

    Line and probe location in “Ferrolux” mode 5.2.3 Recording and managing measurement series During the ongoing measurement, the measurement values (signal level, depth, voltage) Saving measurement recorded directly above the line can be stored as measurement points, and entire points measurement series formed over the course of the measurement.
  • Page 50 Line and probe location in “Ferrolux” mode The currently recorded measurement series and also saved measurement series can be Managing managed using a menu which has been specially provided for this purpose, which can be measurement series called up directly from the menu screen using menu item .

  • Page 51: Line Location And Tracing Using The Ifs Receiver

    Line and probe location in “Ferrolux” mode Line location and tracing using the iFS receiver 5.3.1 Basics for using the iFS receiver In order for the orientation aids displayed on the indicator unit (such as path of the line, direction arrows and signal flow direction) to also actually reflect the correct position and alignment with reference to the line or probe to be located, the receiver must be carried laterally in front of or next to the body, and the side marked must be facing the front.

  • Page 52: Preparation

    Line and probe location in “Ferrolux” mode 5.3.2 Preparation If not only a basic terrain sounding is being carried out but a particular line is also to be transmitting a signal on located, a signal with a frequency (see page 45) supported by the iFS receiver must be the line coupled into this line with the aid of a suitable transmitter.
  • Page 53 Line and probe location in “Ferrolux” mode Step Action Ensure that you are exactly above the line using the available direction indicator (see page 54). Result: The quality of the SignalSelect detection (see page 57) should be either very high or maximum, and the should be indicating the correct signal flow direction.

  • Page 54: Locating The Line

    Line and probe location in “Ferrolux” mode 5.3.3 Locating the line If a line does not have to be traced the entire way from the connection point but instead Introduction only a certain section of the line needs to be detected, the line must first be located in this area and its orientation determined.
  • Page 55 Line and probe location in “Ferrolux” mode Once the receiver has the correct alignment, the signal maximum and therefore the Locating the signal position directly above the cable should now be located by gradually approaching from maximum the side. This work step can also generally be started with the maximum method. When pinpointing in the immediate vicinity of the line, it is advisable to use the super maximum or the minimum method.

  • Page 56: Clear Identification Of The Line On The Basis Of The Current Flow Direction (Only Possible With Signalselect-Modulated Signal)

    Line and probe location in “Ferrolux” mode 5.3.4 Clear identification of the line on the basis of the current flow direction (only possible with SignalSelect-modulated signal) If the transmitter couples a SignalSelect-modulated signal into the line that is being Introduction located, its current flow direction can be identified with the iFS receiver and therefore the line on which a signal is being transmitted can be clearly identified.
  • Page 57 Line and probe location in “Ferrolux” mode The filling of the outer ring reflects the quality of the SignalSelect detection. The following Quality of the applies: The clearer the SignalSelect detection, the higher the fill level. SignalSelect detection The SignalSelect signal can be very easily identified, and there is only very little distortion (forward phase shift).

  • Page 58: Depth Measurement

    Line and probe location in “Ferrolux” mode 5.3.5 Depth measurement The iFS receiver makes it possible to determine the depth both on actively signal-carrying Introduction lines and passive lines which are carrying a current with a frequency of 50, 60, 100 or 120 Hz.
  • Page 59 Line and probe location in “Ferrolux” mode If there is any doubt about the accuracy of the measured values or knowledge of the exact Verifying the laying depth is extremely important due to forthcoming excavation work, the receiver can measuring results be raised about 20 cm above the ground to check whether the displayed depth increases by exactly this value.
  • Page 60 Line and probe location in “Ferrolux” mode the measurement result has not been influenced by adjacent lines, or only slightly influenced. a = b = c 45° The situation is different if the transmitter signal is coupled into an adjacent line or a second supply line with the same mains frequency is running directly parallel to the line.

  • Page 61: Line Tracing

    Line and probe location in “Ferrolux” mode 5.3.6 Line tracing If the entire course of a line needs to be traced (e.g. for the purpose of mapping), it is Introduction advisable to connect the transmitter directly to the line and start tracing at the connection point.
  • Page 62 Line and probe location in “Ferrolux” mode To keep track of the signal level, current and depth measurements during line tracing, a measurement point should be saved (see page 49) at short intervals. If the indicator unit is coupled with a GPS receiver (see page 43), the GPS coordinates of the individual measurement points are also stored.

  • Page 63: Terrain Examination

    Line and probe location in “Ferrolux” mode 5.3.7 Terrain examination The iFS receiver is also ideally suitable for searching a certain area for buried metallic lines, which may be necessary particularly before excavation work. Examination can be carried out in the passive frequency ranges (mains frequency, radio frequencies) as well as with the aid of a transmitter with inductive signal coupling.

  • Page 64: Locating Probes

    Line and probe location in “Ferrolux” mode Locating probes Probes are the preferred means used to identify the routing of non-metallic lines or the Introduction position of a camera probe. There are active probes, which generate the transmitted signal themselves, and passive probes, which are connected to an appropriate transmitter via a cable.
  • Page 65 Line and probe location in “Ferrolux” mode The typical emission characteristic of a probe causes, at the surface, the waveform shown in the following figure, which is characterized by two minimum positions. Use the following procedure to locate the position of a probe. Procedure Step Action...
  • Page 66 Line and probe location in “Ferrolux” mode Step Action Use the receiver to detect the signal from the probe and then follow the compass arrow in the centre of the display — this will take you to the location of the probe. Depending on your initial position, however, you may not approach the probe via the shortest possible path.

  • Page 67: Locating Faults And Sleeves

    Line and probe location in “Ferrolux” mode Locating faults and sleeves 5.5.1 Locating faults and sleeves using the minimum turbidity method The minimum turbidity method is suitable for locating the following special features along Introduction the cable routing: Connecting sleeves •...

  • Page 68: Locating Faults And Sleeves Using The "Twisted-Field" Method

    Line and probe location in “Ferrolux” mode 5.5.2 Locating faults and sleeves using the “Twisted-Field” method The iFS receiver can be used to measure a longitudinal twist in twisted multicore cables Introduction from the surface. The twist is detected due to a constant fluctuation of the signal level when travelling at the same speed along the cable route.
  • Page 69 Line and probe location in “Ferrolux” mode In the case of low-impedance wire-to-shield faults (<10 Ω), the signal is applied between Locating low- the cable shield and a non-faulty wire. At the end of the cable, a low-impedance impedance wire-to- connection must be established between this non-faulty wire and the faulty wire.

  • Page 70: Cable Identification Using The Reader Coil Ifa (Optional)

    Line and probe location in “Ferrolux” mode Cable identification using the reader coil IFA (optional) Reader coil IFA is used to identify a cable carrying the signal of a connected audio Introduction frequency generator within a cluster of several accessible cables (which were exposed due to excavation work, for example).
  • Page 71 Line and probe location in “Ferrolux” mode Reading methods In order to reliably read the target cable among a cluster of lines in close proximity to each other, a SignalSelect-coded signal should applied to the cable. A good method for coupling signals is to use a transmitter clamp, which must also be compatible with SignalSelect.

  • Page 72: Switching Off The Indicator Unit

    Line and probe location in “Ferrolux” mode If it is not possible to couple a SignalSelect-coded signal, use the “Twisted-Field” method described previously for twisted multicore cables. To do this, the audio frequency signal must be applied to a short-circuited pair of wires. A consistent change in signal level will be measured from the inductively coupled cable, whereas the signal response from the neighbouring lines will remain relatively constant.

  • Page 73: Pinpointing Sheath Faults In „Esg" Mode

    Pinpointing Sheath Faults in „ESG“ Mode Pinpointing Sheath Faults in „ESG“ Mode Preparatory Measures 6.1.1 Tracing the Line Trace the route of the faulty cable as exactly as possible in the pre-located area using a line location device. Knowledge of the exact cable route makes it far easier to pinpoint the sheath fault.

  • Page 74: Connecting The Earth Spikes

    Pinpointing Sheath Faults in „ESG“ Mode 6.1.3 Connecting the Earth Spikes The cables supplied with the unit may only be used in accordance with their intended purpose, which is to connect the earth spikes to the indicator unit! CAUTION Hold the earth spikes by the insulated handles only In the immediate vicinity of the potential gradient dangerous voltages may occur at the surface.
  • Page 75 Pinpointing Sheath Faults in „ESG“ Mode To avoid switching back and forth or even accidently pulling out the cable while operating, it is advisable to attach the cable to the earth spike as shown in the diagram: In applications in which it was only possible to pre-locate the fault position very vaguely, or even where it was not possible at all, you will have to approach the position from a greater distance.

  • Page 76: Turning On The Indicator Unit

    Pinpointing Sheath Faults in „ESG“ Mode 6.1.4 Turning On the Indicator Unit Turning on Once the earth spikes are connected to the indicator unit, press the button briefly to switch on. The software automatically detects the connected earth spikes and starts the correct operation mode.
  • Page 77 Pinpointing Sheath Faults in „ESG“ Mode Alternative view In addition to the standard view, the device offers an alternative view for showing the time progress of the step voltage over 16 seconds. This alternative display can be activated or deactivated at any time via the menu item (see page 80).

  • Page 78: Adjusting The Settings

    Pinpointing Sheath Faults in „ESG“ Mode 6.1.5 Adjusting the Settings You can switch from the measurement screen to the menu screen at any time and Menu structure change any settings in two steps at most: Measurement screen Menu screen Each menu screen is made up as follows: Layout of the menu screens Active function...

  • Page 79: 6.1.5.1 Adjusting The Basic Settings

    Pinpointing Sheath Faults in „ESG“ Mode 6.1.5.1 Adjusting the Basic Settings After the indicator unit has been switched on, you can adjust the basic settings. To do so, switch to the menu screen by pressing the knob and selecting the menu item .

  • Page 80: 6.1.5.2 Adjusting The Measurement Settings

    Pinpointing Sheath Faults in „ESG“ Mode 6.1.5.2 Adjusting the Measurement Settings By pressing the knob, you can at any time switch from the measurement screen to the menu screen with the most important measurement settings: In this menu you can perform the following measurement settings: Menu Description item...
  • Page 81 Pinpointing Sheath Faults in „ESG“ Mode Menu Description item Activating/deactivating the high pass filtering. Select this function if severe interference affects the measurements (such as in the vicinity of tram installations). The high pass filter suppresses any constant components, whereby only the edges are displayed but not the impulse itself.

  • Page 82: Approaching The Fault

    Pinpointing Sheath Faults in „ESG“ Mode Approaching the Fault 6.2.1 General Notes With each coupled DC pulse, current flows into the ground at the position of the fault, Technical principles which forms voltage gradients around the fault position. The step voltage, which can be measured on the surface, increases at the fault position and changes polarity directly above the location.
  • Page 83 Pinpointing Sheath Faults in „ESG“ Mode The distance between the earth spikes directly affects the step voltage reading. If the Distance between the distance increases, the potential difference between the two earth spikes rises and earth spikes therefore the voltage reading shown on the indicator unit as well. Particularly when you start pinpointing, it is advisable to place the earth spikes at larger distances from each other so that the generator impulse can be identified as clearly as possible, even at greater distances to the fault location.

  • Page 84: Procedure

    Pinpointing Sheath Faults in „ESG“ Mode 6.2.2 Procedure In the following picture you can see several points of an ideal signal route from the feeding Diagram point to the fault position and beyond: As voltage gradients induced by the current flowing back from the fault position exist around the earthing point of the generator, the measurement values near this point might be elevated (position ).
  • Page 85 Pinpointing Sheath Faults in „ESG“ Mode This is what to do when approaching the fault: Procedure Step Action Find a suitable place to start on the ground directly above the traced cable route or to the side. Insert the two earth spikes in the correct alignment positions (see page 82) into the ground.

  • Page 86: Completing The Work

    Pinpointing Sheath Faults in „ESG“ Mode Step Action Place the black earth spike on the suspected position of the fault and the red earth spike about one metre away. The signal must now point in the direction of the black earth spike. Repeat this control measurement at several other positions in a circle around the black earth spike.

  • Page 87: Pairing With Bluetooth Accessories

    Pairing with Bluetooth accessories Pairing with Bluetooth accessories The indicator unit has a built-in Bluetooth module and can be paired with the following Introduction Bluetooth accessories: Headphones Bluetooth headphones that support at least Bluetooth 3.0 and AD2P. A suitable model can be ordered as an accessory (see page 12).
  • Page 88 Pairing with Bluetooth accessories To pair a device with the display unit for the first time, follow these steps: Perform initial pairing Step Action Ensure that the Bluetooth device you are pairing is switched on and visible to other Bluetooth devices. Headphones usually have to be switched to pairing mode.
  • Page 89 Pairing with Bluetooth accessories If the headset or GPS receiver is switched on and the internal Bluetooth module is active, Establishing a the connection to a known Bluetooth device is normally established automatically within Bluetooth connection to a few seconds after the display unit is switched on. a known device If this does not work or if the display unit is connected to the wrong device, proceed as follows:...

  • Page 90: Gps Data Export And Firmware Update

    • The latest version of the software can be downloaded from the product page on the Megger website. In order to install and use the software, your system must fulfil the following requirements: Operating system: 64 Bit, Windows 7 or later •...

  • Page 91: Exporting And Deleting Measurement Series From The Indicator Unit

    GPS data export and firmware update Exporting and deleting measurement series from the indicator unit Proceed as follows to export measurement series from the indicator unit to the PC: Exporting measurement series Step Action Click on the icon in menu bar on the left. Result: The measurement series stored on the device are displayed.

  • Page 92: Updating The Firmware

    GPS data export and firmware update This is how to delete measurement series from the internal memory of the indicator unit: Delete measurement series Step Action Click on the icon in menu bar on the left. Result: The measurement series stored on the device are displayed. Click on to delete all of the displayed measurement series from the indicator unit.

  • Page 93: Storage And Transport

    Storage and Transport Storage and Transport If you do not expect to use the unit for over a month, you must remove the batteries and Long periods out of use store them separately. and storage You should store the device in a dry and sheltered environment which provides adequate protection against mechanical damage and dirt.

  • Page 94: Maintenance And Care

    Maintenance and Care Maintenance and Care To change the 6 x 1.5 V AA batteries, you must undo the two screws on the underside of Changing the batteries the indicator unit by a quarter of a turn (e.g. using a coin) and then take off the battery compartment cover.
  • Page 95 Tento symbol indikuje, že výrobek nesoucí takovéto označení nelze likvidovat společně s běžným domovním odpadem. Jelikož se jedná o produkt obchodovaný mezi podnikatelskými subjekty (B2B), nelze jej likvidovat ani ve veřejných sběrných dvorech. Pokud se potřebujete tohoto výrobku zbavit, obraťte se na organizaci specializující se na likvidaci starých elektrických spotřebičů...

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