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1、User Guide MEGGER Time Domain Reflectometer MEGGER CFL535E - TDR2000 RadioFans.CN 收音机爱 好者资料库 Safety Warnings3 Introduction4 Features and Controls6 Operation8 Instrument Features9 Balance Control9 Velocity Factor9 Pulse Widths9 Memory Features10 Configuration Menu11 Techniques to Improve Accuracy13 C
2、are and Maintenance13 Specification14 Repair and Warranty16 MeterCenter (800) 230-6008 www.MeterC Caution: Refer to accompanying notes. Equipment protected throughout by double or reinforced insulation Instrument flash tested to 3.7kV r.m.s. for 1 min. Equipment complies with current EU directives S
3、ymbols used on the instrument are: Contents RadioFans.CN 收音机爱 好者资料库 3 SAFETY WARNINGS #This instrument meets the safety requirements of IEC 61010 part 1 to 150V cat III. If it is to be used in situations where hazardous live voltages may be encountered then an additional blocking filter must be used
4、. #CAUTION (Risk of electric shock) #Although this tester does not generate any hazardous voltages, circuits to which it can be connected could be dangerous due to electric shock hazard or due to arcing (initiated by short circuit). While every effort has been made by the manufacturer to reduce the
5、hazard, the user must assume responsibility for ensuring his or her own safety. #The instrument should not be used if any part of it is damaged. #Test leads, probes and crocodile clips must be in good order, clean and with no broken or cracked insulation. #Check that all lead connections are correct
6、 before making a test. #Disconnect the test leads before accessing the battery compartment. #Refer to operating instructions for further explanation and precautions. #Safety Warnings and Precautions must be read and understood before the instrument is used. They must be observed during use. NOTE THE
7、 INSTRUMENT MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS RadioFans.CN 收音机爱 好者资料库 Thank you for purchasing this quality AVO product. Before using your new instrument please take the time to read this user guide, ultimately this will save you time, advise you of any precautions you need
8、 to take and could prevent damage to yourself and the instrument. Your TDR2000 is a very advanced instrument capable of identifying a wide range of cable faults. The instrument uses a technique called Time Domain Reflectometry (TDR) which in many ways is similar to radar. Narrow pulses of electrical
9、 energy are transmitted along a pair of conductors in a cable. The pulse travels through the cable at a velocity determined by the insulation between the conductors and the resistance to the flow of the pulse is characterised as impedance for the cable. Changes in cable impedance will cause a propor
10、tion of the pulse to be reflected. The pulse velocity is normally described as a fraction of the speed of light and is called the Velocity Factor. By measuring the time between the transmitted pulse and the reception of the reflected pulse, and multiplying this by the speed of light and the velocity
11、 factor, the actual distance to the reflection point can be given. Faulty cables, poor joints or discontinuities will all cause a change in impedance. Impedances higher than the cables cause a normal reflection. Impedances lower than the cables cause an inverse reflection. Matched terminations absor
12、b all the pulse hence no reflection will occur, the cable appearing endless. Open or Short circuits will reflect all the pulse energy and the TDR will not see the cable beyond that fault. As a pulse is transmitted down a cable, the size and shape of that pulse is gradually attenuated by losses in th
13、e cable: the pulse gets smaller in height and more spread out. The level of attenuation is determined by the cable type, the condition of the cable and any connections along its length. The limit of how far you can see is determined by the point beyond which you will not discern a reflection. To max
14、imise the instruments range, the TDR2000 has an adjustable gain setting on its input that can apply up to 90dB of gain to the reflected signal to allow you to discern a reflection from farther away. By combining this variable gain with increasing pulse widths, the TDR2000 can discern faults up to 16
15、Km away. The MEGGER TDR2000 can be used on any cable consisting of at least two insulated metallic elements, one of which may be the armouring or screen of the cable. The balancing circuit, which is described in the Operating Instructions, can balance for any cable with a characteristic impedance of
16、 0-120. Dual inputs and the large graphic display allow a wide range of comparative tests to be performed between cable pairs or stored results. The instrument has 15 trace memories, enabling previous test results to be displayed and compared with “live” results. This allows the gradual ageing of a
17、cable to be monitored or characteristic changes to be detected between periodic tests, for example if the cable has suffered water ingress or has been tapped and split. Introduction 4 There are four modes of operation to get “live” results, and these are: L1 it shows visible damage; fails to perform
18、 the intended measurements; has been subjected to prolonged storage under unfavourable conditions, or has been subjected to severe transport stresses. NEW INSTRUMENTS ARE GUARANTEED FOR 3 YEARS FROM THE DATE OF PURCHASE BY THE USER. NOTE: Any unauthorized prior repair or adjustment will automaticall
19、y invalidate the Warranty. INSTRUMENT REPAIR AND SPARE PARTS For service requirements for MEGGER Instruments contact: AVO INTERNATIONAL or AVO INTERNATIONAL Archcliffe Road Valley Forge Corporate Centre Dover 2621 Van Buren Avenue Kent, CT17 9EN.Norristown, PA 19403 England.U.S.A. Tel: +44 (0) 1304
20、502243Tel: +1 (610) 676-8579 Fax: +44 (0) 1304 207342 Fax: +1 (610) 643-8625 For sales Contact: MeterCenter (800) 230-6008 www.MeterC Approved Repair Companies A number of independent instrument repair companies have been authorised for repair work on most MEGGER instruments, using genuine MEGGER sp
21、are parts. Consult the Appointed Distributor/Agent regarding spare parts, repair facilities, and advice on the best course of action to take. Returning an Instrument for Repair If returning an instrument to the manufacturer for repair, it should be sent freight pre-paid to the appropriate address. A copy of the invoice and of the packing note should be sent simultaneously by airmail to expedite clearance through Customs. A repair estimate showing freight return and other charges will be submitted to the sender, if required, before work on the instrument commences. Repair and Warranty 16
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