Megger Digiflex Com Instruction Manual
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Megger Digiflex Com Instruction Manual

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Instruction Manual
Digiflex Com
Mess- und Ortungstechnik
Measuring and Locating Techniques
Elektrizitätsnetze
Power Networks
Kommunikationsnetze
Communication Networks
Rohrleitungsnetze
Water Networks
Leitungsortung
Line Location
- Date of release: 2003/30 -
EN

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  • Page 1 Instruction Manual Digiflex Com Mess- und Ortungstechnik Measuring and Locating Techniques Elektrizitätsnetze Power Networks Kommunikationsnetze Communication Networks Rohrleitungsnetze Water Networks Leitungsortung Line Location - Date of release: 2003/30 -...
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  • Page 3 Digiflex Com compact and light-weight Time-Domain Reflectometer man_digiflex_com_en_02_5.doc...
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  • Page 5: Table Of Contents

    TABLE OF CONTENTS     GENERAL  .................... 9      ..................  9 DVICE FROM  EGGER      ............  1 0 ERMS AND CONDITIONS OF WARRANTY      ..................  1 1 AFETY  NSTRUCTIONS       ............  1 2 NDICATIONS USED IN THE DESCRIPTION     TECHNICAL DESCRIPTION ................ 13      ................. ...
  • Page 6     NIMH ACCUMULATOR CHARGER.............. 45      .............. 45 HARGING THE  CCUMULATOR      .... 45 ENERAL  NSTRUCTIONS ON  OW TO  ANDLE A    CCUMULATOR     4.2.1 Safety Precautions................ 46     4.2.3 Practical Hints ................ 46     CARE AND MAINTENANCE ............... 47     APPENDIX  .................... 49      ............... 49 IST OF  BBREVIATIONS      ...
  • Page 7 Compatibility (EMC Directive 89/336/EEC) and Low Voltage (Directive 73/23/EEC). This EC Declaration of Conformity is the result of a verification test performed by the department of Quality Assurance of Megger Kabelmesstechnik GmbH. Conformance with the directive on Electromagnetic Compatibility was verified in accordance with the following standards:...
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  • Page 9: General

    Megger have before-hand declared their consent in writing. The content of this handbook is subject to change without notice. Megger cannot be made liable for technical or printing errors or shortcomings of this handbook. Megger also disclaims all responsibility for damage resulting directly or indirectly from the delivery, supply, or use of this matter.

  • Page 10: Terms And Conditions Of Warranty

    Terms and conditions of warranty Megger accept responsibility for a claim under warranty brought forward by a customer for a product sold by Megger under the terms stated below. Megger warrant that at the time of delivery Megger products are free from manufacturing or material defects which might considerably reduce their value or usability.

  • Page 11: Safety Instructions

    Therefore, please comply with the following safety instructions! GENERAL INSTRUCTIONS Work on the Digiflex Com and its peripherals must only be carried out by trained and/or instructed staff. Other persons must be kept away. This manual must be available for the supervisory, operating and maintenance staff to refer to.

  • Page 12: Indications Used In The Description

    The user is under an obligation to report any changes in the Digiflex Com to the supervisor responsible without delay. The operator is under an obligation to shut the Digiflex Com down immediately in the event of a malfunction which detracts from the safety of staff.

  • Page 13: Technical Description

    TECHNICAL DESCRIPTION General Description is a compact, light-weight and easy-to-handle digital Digiflex Com time-domain reflectometer locating faults balanced telecommunication and control lines. It can be handled easily and so enables even an inexperienced user to locate faults precisely and fast.
  • Page 14 L1 and Digiflex Com L2 at the same time and to show two reflectograms simultaneously. This can be done using currently taken reflectograms or test results stored in memory.

  • Page 15: Specifications

    Specifications Modes of testing: Reflection test of cable connected to socket L1 versus built-in balancing network Reflection test of cable connected to socket L2 versus built-in balancing network A reflection test is carried out alternately on Alt: cables connected to sockets L1 / L2 Diff: Measurement of difference between cables connected to sockets L1 and L2...
  • Page 16 Maximum resolution 1.25 cm for range 50 m at 50 m/µs 2.5 cm for range 50 m at 100 m/µs 2.5 cm for range 100 m 5 cm for range 200 m 10 cm for range 400 m 25 cm for range 1000 m 50 cm for range 2000 m...
  • Page 17 Pulse width Pulse width is linked to range of measurement: 5 ns for range 50 m (100 m/µs) 5 ns for range 100 m 10 ns for range 200 m 20 ns for range 400 m 50 ns for range 1 km 200 ns for range 2 km 200 ns...
  • Page 18 Environmental conditions Operating temperature -10 °C … +50 °C Storage temperature -20 °C … +60 °C (without accumulator) Storage temperature -20 °C … +50 °C (accumulator) Dimensions, mm 176 x 260 x 70 (L x W x H) 186 x 260 x 70 incl. measuring terminals Weight approx.

  • Page 19: Items Supplied And Optional Extras

    Items Supplied and Optional Extras Items supplied: Description Digiflex Com, consisting of Digiflex Com (G,E, two languages on request) - 2 pcs. set of test leads - Case for Digiflex Com - Accumulator 7,2 V / 2,2 Ah / NiMH - Charger - Plug-in mains unit for charger;...
  • Page 20 Optional Extras: Description for use as Rechargeable accumulator replaceable accumulator 7,2 V / 2,2 Ah / NiMH Winkis Com PC software for evaluating and storing reflectograms Printer set means for the on-site preparation of test reports Transportation case for printer set Plug-in mains unit external source of power Adapter cable...

  • Page 21: Operation

    OPERATION Fig 1 , Front View Digiflex Com Measuring Terminals In general, these measuring sockets are used for connecting the faulty line or line to be tested. When using this configuration please make sure that your is set to mode L1. In mode NEXT Digiflex Com this pair of sockets is used for receiving the crosstalk.

  • Page 22: Display

    Display The LC-Display has 256 x 128 pixels, controls for setting contrast, and switchable back lighting. This enables graphic information to be readable even in difficult lighting conditions. inverted The activated function is display in representation. accumulator condition or distance from begin printing is under way ...
  • Page 23 The lower and larger part of the display shows this black section magnified in full detail. Use the cursor when you want to change the position of the section and change the X zoom factor when you want to change the width of the section.

  • Page 24: Functions Of Keys And Rotary Encoder

    Alt to memories 1 and 2. When you press the help key (?) the will display informations Digiflex Com on one of the following topics: (key ?; select with rotary encoder; press key Mark, key ? for return):  Information on help ...
  • Page 25 Marker: Activate cursor; move cursor to start point of Cursor measurement; set marker Cancel Range (Measuring Range) X-Zoom Pulse width Vertical shift Gain, dB Y-Mag(nification) Distance depending amplitude correction Propagation velocity / NVP Compensation Modes: Single or Dual Display Single Continuous Menu Average...
  • Page 26 Possible settings in Menu: Menu/Units Units meter feet seconds NVP units Menu/Interface Baud rate 1200 9600 19200 Parity None (Parity bit) Even Menu/Printer Printer HP Deskjet Epson 24 needles Epson 9 needles Kodak Diconix Layout Normal Special Menu/System Self test Software version Serial number Date &...

  • Page 27: Getting Started (Insert / Replace Accumulator)

    Getting Started (Insert / Replace Accumulator) The accumulator compartment is located in the back of the Digiflex Com Make sure that all test leads have been disconnected before opening the accumulator compartment. Switch the device off in order to retain all data.

  • Page 28: Main Menu

    Main Menu Main Menu will appear automatically after the has been Digiflex Com switched on. In this menu measurements are taken employing the device settings that were in effect when the device was used last time. Most functions of can be started directly from menu Measurement Digiflex Com by means of the keys or rotary encoder as described in section 3.3.

  • Page 29: How To Locate A Fault

    (3) The is able to measure the length of the cable and the Digiflex Com distance to a point of fault. It is not able, however, to find out the route of the cable between the point of measurement and the location of the fault.

  • Page 30: Faults Causing A Negative Reflection

    3.8.1.1 Faults Causing a Negative Reflection (1) Short circuit: Direct contact of two conductors of a cable. This will cause a negative reflection, see Fig 4. Fig 4 Type of Fault Causing a Negative Reflection (2) Short-circuit to shield: One conductor in a cable is in contact with the metal shield of the cable.
  • Page 31 (2) Resistance faults: If a cable is not properly connected in a junction box, increased contact resistance will occur. This type of fault generates a positive reflection in a size which is dependent on the quality of the connection resp. its resistance. (3) Shield interrupt means that the metal shield of a cable is broken or has become detached.

  • Page 32: Further Fields Of Application

    The will interpret the coils used for the Digiflex Com inductive loading of the system as open ends. Connect the instrument to some point behind the coil if you want to locate a fault which is situated beyond the bounds of a coil-loaded section.
  • Page 33 (6) Match the to the object under test as described in Digiflex Com section 3.7. (7) First of all, try to find the (open) end of the cable.

  • Page 34: How To Determine An Unknown Nominal Velocity Of Propagation Or Pulse Propagation Velocity

    3.8.3 How to Determine an Unknown Nominal Velocity of Propagation or Pulse Propagation Velocity When the nominal velocity of propagation or pulse propagation velocity of the faulty cable is not known, a test sample of the same type of cable with known length is needed (or the distance to a specific point in the cable must be known).

  • Page 35: Averaging

    In order to solve this problem, the is equipped with an Digiflex Com averaging mode. Press function key Mode and use the rotary encoder to enable mode Averaging. The display will display the number of measurements taken for averaging (max.

  • Page 36: Mode Next

    Digiflex Com subsequently be eliminated to the point. For instance, the device can determine the beginning and the end of a ”split pairs” section in a longer trunk line which is composed of a number of sections.

  • Page 37: Mode Ifl

    This may lead to misinterpretations. has a distance-dependent amplitude correction mode Digiflex Com (amplitude correction) which allows echos of identical size to be displayed with identical echo amplitude irrespective of their distance to the Digiflex .

  • Page 38: How To Use The Marker

    If you use only the cursor you can just determine the distance from the to the point of reflection in the cable. The marker offers you Digiflex Com additional means to set a point of reference in the cable and to take measurements in relation to this point by means of the cursor.

  • Page 39: Change Of Pulse Width

    3.8.10 Change of Pulse Width Press keys 2nd Range to change pulse width. Doing so will not change the display range. Display range Default pulse width Setting range (Range/Zoom at =100 m/µs) 5 ns 5 ns 10 m 5 ns 5, 10 ns 20 m 5 ns...

  • Page 40: Self Test

    3.8.11 Self Test After turn on, the performs an automatic selftest. If error code Digiflex Com 1 is display the Lithium accumulator is (almost) discharged (the device will still operate for a short while, but you should submit it to the Customer Service to have the Lithium accumulator replaced).

  • Page 41: Memory Function

    Memory Function has 50 memory locations. This is how to save a trace: Digiflex Com  Press key Save  Use the rotary encoder to select a free memory location or a location that will be overwritten. The selected memory location is displayed in inverted mode ...
  • Page 42 Mode of Mode of display Indication loading Loading Reflectogram stored in selected memory location A loading The reflectogram from memory is shown as a ,M top right in dotted line, the reflectogram currently taken is front of Cursor shown as a continuous line. If you wish to erase the display of the trace stored in memory, do so by using the key ...

  • Page 43: Serial Interface

    Serial Interface The serial interface of the allows reflectograms to be loaded to Digiflex Com an external PC or to connect a printer for printing out a hardcopy. Go to Menu/Printer to choose from HP Deskjet, Epson 24 Needles, Epson 9 Needles, and Kodak Diconix.
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  • Page 45: Nimh Accumulator Charger

    NIMH ACCUMULATOR CHARGER Charging the Accumulator First connect the cable from the plug-in mains unit to the DC-IN socket of the charger, and only then plug the mains unit into a mains outlet. Now insert the appropriate NiMH rechargeable accumulator into the charger case until it engages gently.

  • Page 46: Safety Precautions

    The optimum way of operation is to have two accumulators, with one remaining in the charger while the other one is used for powering the Digiflex Com The charger and the inserted accumulator will heat up during charging (hand hot). This is normal and does not indicate any defect.

  • Page 47: Care And Maintenance

    Submit the or its accessories to your service shop or to Digiflex Com Megger for repair should any defect occur. Never use any aggressive solvent or detergent for cleaning your Digiflex and its accessories. Use a soft, dry cloth for cleaning your Digiflex and its accessories.
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  • Page 49: List Of

    APPENDIX List of Abbreviations Used Alternating test Direct current Electromagnetic compatibility International Electrotechnical Committee Intermittent fault location Liquid crystal display Light emitting diode NEXT Near end cross (X)-talk NiMH Nickel metal hydrid Nominal velocity of propagation Time domain reflectometer Verein Deutscher Elektrotechniker (Association of German Electrotechnical Engineers) man_digiflex_com_en_02_5.doc...
  • Page 50 Conversion: NVP  Conversion NVP  s • 299.79  )  NVP Conversion s • 2 299.79  Table: NVP and for Common Types of Cables Typical propagation time , m/µs , ft/µs Insulation Oil-impregnated paper 75-84 246-276 0.50-0.56 Poly, cross-linked 78-87 256-285...
  • Page 51 From your own measurements: Propagation time , m/µs , ft/µs Insulation or type of cable man_digiflex_com_en_02_5.doc...
  • Page 52 It is used for suppressing the display of the transmitter pulse so that reflections can be depicted and measured directly from the output of the – there is no dead zone as otherwise usual. Digiflex Com man_digiflex_com_en_02_5.doc...
  • Page 53 (e.g. a faulty junction box with improper shielding of individual  pairs from one another). is able to locate these types of faults. Digiflex Com (= Nominal Velocity of Propagation) The value of NVP, also called propagation time factor or ”reduction factor”...
  • Page 54 (twisted pairs) to avoid any interference effects. (= Time Domain Reflectometer) is a reflectometer operating in what is Digiflex Com known as the time domain. Apart from the amplitude, the measures exclusively propagation times with Digiflex Com...
  • Page 55 In cable testing it is common practice to specify the signal propagation velocity in term of half the actual velocity. When employing the reflection technique, this is a usual way of taking twice the signal travel path into account. To depict a reflection on the screen, the signal has to travel from the meter to the fault and back.
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