Megger Digiflex Com Instruction Manual Download Page 2

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man_digiflex_com_en_02_5.doc

Summary of Contents for Digiflex Com

Page 1: ...etze Communication Networks Elektrizit tsnetze Power Networks Rohrleitungsnetze Water Networks Leitungsortung Line Location Date of release 2003 30 EN Mess und Ortungstechnik Measuring and Locating Te...

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Page 3: ...man_digiflex_com_en_02_5 doc 3 Digiflex Com compact and light weight Time Domain Reflectometer...

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Page 5: ...TIAL REFLECTION 28 3 8 HOW TO LOCATE A FAULT 29 3 8 1 Fields of Application 29 3 8 1 1 Faults Causing a Negative Reflection 30 3 8 1 2 Faults Causing a Positive Reflection 30 3 8 1 3 Further Fields of...

Page 6: ...45 4 2 GENERAL INSTRUCTIONS ON HOW TO HANDLE A NIMH ACCUMULATOR 45 4 2 1 Safety Precautions 46 4 2 3 Practical Hints 46 5 CARE AND MAINTENANCE 47 6 APPENDIX 49 6 1 LIST OF ABBREVIATIONS USED 49 6 2 C...

Page 7: ...ification 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 foll...

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Page 9: ...liffe Road Kent CT17 9EN T 44 1304 502100 F 44 1304 207342 E uksales megger com Dr Herbert Iann Str 6 D 96148 Baunach T 49 9544 68 0 F 49 9544 22 73 E sales sebakmt com Hagenuk KMT Kabelmesstechnik Gm...

Page 10: ...s 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 rem...

Page 11: ...ed staff Other persons must be kept away This manual must be available for the supervisory operating and maintenance staff to refer to Improper use may endanger life and limb the Digiflex Com and conn...

Page 12: ...dead and then only by a skilled electrician in accordance with current accident prevention regulations A skilled electrician in the sense of the accident prevention regulations is a person who can ass...

Page 13: ...ll be displayed on the screen with a time delay corresponding to its propagation time A change in the electric characteristics of a cable may be caused either by a possible fault or by local circumsta...

Page 14: ...lk NEXT Pair versus Pair k1 measurement Measurement of time variable intermittent faults IFL There are two display modes the user can choose between When you wish to get a revealing overview of the ca...

Page 15: ...onnected to sockets L1 L2 Measurement of difference between cables connected to sockets L1 and L2 Location of crosstalk between cables connected to sockets L1 and L2 Pairs to be connected 2 Modes of o...

Page 16: ...m 10 m for range 30 km Accuracy 0 1 of range of measurement 1 cursor step Gain 0 80 dB in steps of 1 dB Dynamic range 90 dB Distance depending amplitude correction settable in 99 steps Distance readin...

Page 17: ...al strength of test inputs 250 V AC DC 50 60 Hz CAT II overvoltage category Memory locations 50 Measuring rate up to 11 reflectograms per second averaging mode short range Display rate up to 4 screen...

Page 18: ...20 C 60 C without accumulator 20 C 50 C Dimensions mm 176 x 260 x 70 L x W x H 186 x 260 x 70 incl measuring terminals Weight approx 1 5 kg Interelement protection class II with accumulator compartmen...

Page 19: ...iption 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 100 240 V...

Page 20: ...n site preparation of test reports Transportation case for printer set Plug in mains unit external source of power Adapter cable for charging the accumulator from a vehicle electric mains using the ch...

Page 21: ...a reference for comparison with the test object connected to L1 In mode Diff this facilitates the detection of small fault reflections in the tested line connected to L1 because each reflection cause...

Page 22: ...e two modes of displaying the reflectograms Press Display when you want to work with two images of the trace see Fig 3 The upper is the reflectogram of the full range of measurement There is a black b...

Page 23: ...ther operation Replace the accumulator or charge it in order to restore readiness for operation Switch the instrument off before replacing the accumulator to retain all data Press one of the following...

Page 24: ...y the Digiflex Com will display informations on one of the following topics key select with rotary encoder press key Mark key for return Information on help Fault location Operation Compensation Avera...

Page 25: ...ity NVP Single or Dual Display Menu Menu Units Menu Interface Menu Printer Menu System Menu Power supply Help Cursor Range Measuring Range Pulse width Gain dB Distance depending amplitude correction C...

Page 26: ...enu Printer Printer Layout HP Deskjet Epson 24 needles Epson 9 needles Kodak Diconix Normal Special Menu System Self test Date time Language Software version Serial number mm dd yy hh mm ss AM PM Germ...

Page 27: ...ed the Digiflex Com can be switched off any time by pressing key When being switched off the device saves all device settings so the same operating status is restored when the instrument is switched o...

Page 28: ...o as to be able to detect and locate a fault at close range i e at a distance of up to 10 meters When a faultless pair of conductors of the same type of cable as the faulty one is available and when i...

Page 29: ...he Digiflex Com is able to measure the length of the cable and the 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 locat...

Page 30: ...ng this type of short circuit first disconnect earth from the shield Then connect the test leads to the shield and the conductor which is shorted with it 3 Reversed mixed up wires Reversed wires gener...

Page 31: ...an individual cable is twisted a negative error reflection appears As the distance between the points of crossing and crossing is usually very small both reflections occur almost simultaneously and a...

Page 32: ...nt behind the coil if you want to locate a fault which is situated beyond the bounds of a coil loaded section 3 8 2 Testing a Cable with Known Nominal Velocity of Propagation NVP or with Known Pulse P...

Page 33: ...f all try to find the open end of the cable 8 Look for a fault reflection in the overview trace displayed on top In doing so increase gain or amplitude correction steadily until the point of fault is...

Page 34: ...cable junctions and other connections resulting in a trace which is normally similar to that shown in Fig 7 good pair In Fig 8 Faulty pair in addition to the fault other cable reflections are visible...

Page 35: ...to solve this problem the Digiflex Com is equipped with an averaging mode Press function key Mode and use the rotary encoder to enable mode Averaging The display will display the number of measuremen...

Page 36: ...tions The point of crosstalk coupling is located as in any normal reflection test This mode is different however in that the pair which shall carry the transmitter pulse is connected to L2 and the pai...

Page 37: ...f each cable any signal is more and more attenuated the longer the distance to the point where the reflection takes place If in a cable there are two points of fault of identical size which are at a c...

Page 38: ...se measuring accuracy and for determining the NVP v 2 value of a cable section of known length Press key Mark to set or erase the marker To this end press key Cursor and move the vertical line by mean...

Page 39: ...200 ns 200 750 3000 ns 7 5 km 750 ns 750 3000 ns 15 km 750 ns 750 3000 ns 30 km 3000 ns 3000 ns The offered combinations of pulse width and display range take into account that not every pulse width...

Page 40: ...vice to have the Lithium accumulator replaced Error code 2 asks for setting the clock 2nd Menu Menu System Mark go with rotary encoder to Date Time Mark select unit of time with rotary encoder Mark se...

Page 41: ...y change of the v 2 setting will also change this value in the reflectogram When a trace is loaded v 2 is re set to its stored value In mode ALT two adjacent memory locations are made available for st...

Page 42: ...t in front of Cursor Use key combination 2nd Recall for a quick download of a trace from memory location 1 The traces stored in memory can later be used for processing or for printing out a hardcopy I...

Page 43: ...onal extra is installed on the PC Winkis Com can also be used for re loading a reflectogram including its set up Furthermore Winkis Com gives you access to all reflectograms stored Please refer to the...

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Page 45: ...approx 4 hours the indicator lamp will light up green You may now remove the accumulator or leave it in the charger 4 2 General Instructions on How to Handle a NiMH Accumulator ATTENTION Do not short...

Page 46: ...e of a NiMH accumulator unnecessarily make sure that the accumulator is at room temperature when charging is started Overnight charging will not cause any trouble since an intact accumulator cannot be...

Page 47: ...ce shop or to Megger for repair should any defect occur Never use any aggressive solvent or detergent for cleaning your Digiflex Com and its accessories Use a soft dry cloth for cleaning your Digiflex...

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Page 49: ...bility IEC International Electrotechnical Committee IFL Intermittent fault location LCD Liquid crystal display LED Light emitting diode NEXT Near end cross X talk NiMH Nickel metal hydrid NVP Nominal...

Page 50: ...v 2 for Common Types of Cables Typical propagation time Insulation v 2 m s v 2 ft s NVP Oil impregnated paper 75 84 246 276 0 50 0 56 Poly cross linked 78 87 256 285 0 52 0 58 Poly filled with Petrola...

Page 51: ...man_digiflex_com_en_02_5 doc 51 From your own measurements Propagation time Insulation or type of cable v 2 m s v 2 ft s NVP...

Page 52: ...over time Pulse In a TDR device pulses are used as transmitter signals A pulse is an electrical signal with high amplitude and short duration When travelling along the cable each pulse is more and mor...

Page 53: ...faktor in German is a way to describe the propagation velocity of a signal along a line It specifies the ratio of signal propagation velocity to the velocity of light If for instance the NVP of a cabl...

Page 54: ...hich is enclosed in a common shield Balanced Line Two wire line with the voltages of either conductor versus earth being equal in size but opposite in polarity Usually two wire line are twisted twiste...

Page 55: ...ay 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 If the v 2 values of various cables are listed...

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