Radiodetection T631 TDR Скачать руководство пользователя страница 34 | Manualshive

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A conversion chart is given below:

Radiodetection Ltd. 00901209-6

T631 OPERATING MANUAL

34

Reflection Coefficient/Return Loss Conversion Chart

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Содержание T631 TDR

Страница 1: ...Locator Operating Manual Issue 6 Refer to Preface and Safety Instructions before operating Radiodetection Ltd Western Drive Bristol BS14 0AF United Kingdom Tel 44 0 117 976 7776 Fax 44 0 117 976 7775 E mail sales uk radiodetection spx com 00901209 6 ...

Страница 2: ...ocument is copyright and may not be copied or reproduced or transmitted or modified or used in whole or in part in any way whatsoever without the specific prior written consent of Radiodetection Ltd Radiodetection Ltd 00901209 6 T631 OPERATING MANUAL 2 ...

Страница 3: ...structions 21 7 1 General 21 7 2 Switch On 21 7 3 Programming from the Help Menu 22 7 4 Setting Dielectric PVF 23 7 5 Connecting to cable under test 27 7 6 Locating a cable fault 27 7 7 Use of left hand cursor 28 7 7 1 Eliminating the length of the test lead 29 7 7 2 Measuring between two features 29 T631 OPERATING MANUAL 3 Radiodetection Ltd 00901209 6 ...

Страница 4: ... Storing a trace 39 8 2 Recalling a trace 39 8 3 Comparing a live and stored trace 39 8 4 Difference between a live and stored trace 40 9 RS232 Printing and PC Interface 41 10 Help Menu 43 11 Error Messages 44 12 Specification 45 13 Product Safety Data 53 Appendix Bicotest Product Range 57 Radiodetection Ltd 00901209 6 T631 OPERATING MANUAL 4 ...

Страница 5: ... or prescribed applications and within the parameters specified it will not cause danger or hazard to health or safety All usage of the product must be in accordance with the Operating Manual for this equipment and any work on the electrical components housed within the machine must be undertaken by qualified personnel T631 OPERATING MANUAL 5 Radiodetection Ltd 00901209 6 ...

Страница 6: ...or indoor use only The main unit is safe and conforms to IEC 1010 The AC adaptor conforms to the manufacturers safety standards 1 3 BATTERIES The T631 is provided with a set of 2 Ah rechargeable NiCad cells These are supplied in the discharged state and must be charged for 24 hours before use Charge the batteries as described in section 4 Note that full rated capacity may not be achieved for the f...

Страница 7: ...lt is displayed on the screen after the cursor is positioned to coincide with the start of the fault pulse The type of fault can be determined by analysis of the displayed waveform Although designed principally for 50 75 and 93 Ω coaxial cables it is equally effective on other cable types as a fault locator Impedance mismatches can be measured in terms of Return Loss dBRL with the location display...

Страница 8: ...dance series faults Note Positive upward reflection 2 Short circuit low impedance shunt faults Note Negative downward reflection Radiodetection Ltd 00901209 6 T631 OPERATING MANUAL 8 Transmit Pulse Reflected Pulse Transmit Pulse Reflected Pulse ...

Страница 9: ...live and stored trace 2 2 POWER SOURCE The T631 is powered by 8 rechargeable cells in a compartment accessible from the rear of the T631 or from an external DC power source via the DC jack When operated from batteries the T631 will automatically switch off before the batteries are completely discharged T631 OPERATING MANUAL 9 Radiodetection Ltd 00901209 6 ...

Страница 10: ...2 3 MAIN FEATURES Figure 1 shows the front panel of T631 Radiodetection Ltd 00901209 6 T631 OPERATING MANUAL 10 ...

Страница 11: ...LINE mode PVF units and impedance will remain as they were before switch off Rotary control to adjust the contrast of the screen display It is recommended that it is set to the mid position on switch on to obtain a display CURSORS two independent cursors Adjusts the position of the appropriate cursor Cursors move left or right as indicated If held down the cursor initially moves slowly and will th...

Страница 12: ...7 and Section 12 Specification for further details OPERATION Selects the operating mode see Section 6 for further details DIELECTRIC Used to set the appropriate velocity factor for the cable dielectric The value will increment or decrement If held down the value changes slowly at first and then quickens Also act as numbers 6 and 11 RANGE Selects the displayed range The range will increase or decre...

Страница 13: ...ill step through the available gain stages Also act as numbers 9 and 14 MEMORY Enables a live trace to be stored into any of 15 memory locations Also acts as number 10 Enables any of 15 stored traces to be recalled Also acts as number 15 BACKLIGHT Switches the display backlight ON and OFF The backlight will switch off automatically after 5 minutes Also acts as number 5 T631 OPERATING MANUAL 13 Rad...

Страница 14: ...nit to search for the next significant reflection starting from the right hand cursor position see Section 7 8 Also acts as number 3 HELP MENU Accesses a Help menu for setting machine parameters see Section 10 Also acts as number 2 RETURN LOSS Enables the return loss between the transmitted pulse and a selected reflected pulse to be determined Also acts as number 1 Radiodetection Ltd 00901209 6 T6...

Страница 15: ... way D connector to interface with a printer or PC DC jack to supply 12 20 V external DC Note centre is positive 3 3 CHARGE INDICATOR Battery Charging Charge Indicator illuminates when the internal battery is being charged T631 OPERATING MANUAL 15 Radiodetection Ltd 00901209 6 ...

Страница 16: ...arged battery will give approximately 8 hours operation if the backlight is not used see Section 12 Power Source for details of charging voltages Note Whenfittingnewcellstheinitialchargeperiodshouldbe24hoursand14hoursthereafter 4 1 2 MAXIMISING BATTERY LIFE Do not recharge until the Battery Low warning is displayed Do not charge for more than 24 hours Stay within the RECOMMENDED temperature limits...

Страница 17: ...it Cells are accessed by removing the back cover which is secured by 2 fasteners See specification Section 12 for cell type It is recommended that cells are replaced as a set of 8 T631 OPERATING MANUAL 17 Radiodetection Ltd 00901209 6 Figure 2 Battery Access ...

Страница 18: ...n external 15 20V DC power is applied and the unit is switched off DO NOT FIT NON RECHARGEABLE BATTERIES 4 3 MEMORY BACK UP BATTERY The memory back up battery is a lithium manganese cell which is part of the main PCB assembly The life expectancy is typically four years and replacement is recommended every two years during a routine service to avoid possible loss of stored traces Radiodetection Ltd...

Страница 19: ...5 DISPLAY T631 OPERATING MANUAL 19 Radiodetection Ltd 00901209 6 Figure 3 T631 Display ...

Страница 20: ... memory is displayed 3 Dual L M the trace obtained from the cable connected to the BNC socket and a selected trace recalled from the memory are displayed simultaneously 4 DIFF L M the trace displayed is the difference between the trace of the cable connected to the BNC socket and a selected trace from the memory Radiodetection Ltd 00901209 6 T631 OPERATING MANUAL 20 ...

Страница 21: ...ed internal batteries or from the AC adaptor or external DC source Press the on button and the display should appear Rotate the contrast control if necessary to obtain a well defined trace On receipt from the factory the unit will power up in the LIVE cable mode on the 6 m range with the distance read out in metres a propagation velocity factor PVF of 0 667 and impedance 75 Ω The left hand cursor ...

Страница 22: ...ine settings are restored when the unit is switched on 7 3 PROGRAMMING FROM THE HELP MENU 7 3 1 DISTANCE UNITS Press HELP key to obtain the Menu Selects UNITS by pressing the key indicated Select Feet Metres or Time by pressing the appropriate key 7 3 2 DIELECTRIC PARAMETERS Press HELP key to obtain the Menu Select DIELECTRIC by pressing the key indicated Select PVF V or V 2 by pressing the approp...

Страница 23: ...s switched off Auto pulse selection allows the instrument to select a pulse appropriate to the selected range This mode is selected by pressing HELP and then selecting PULSE WIDTH and AUTO 7 4 SETTING DIELECTRIC PVF 7 4 1 FROM CABLE TYPE The unit can be directly programmed from the list of cable types contained in the HELP Menu To access the Menu press HELP press the key appropriate to CABLE TYPE ...

Страница 24: ...s to the value appropriate to the cable under test OPTION MAIN TYPE SUB TYPE DIELECTRIC SETTING M µs PVF V V 2 1 TELEPHONE POLY PE JELLY FILLED PAPER 0 83 uF PAPER 0 72 uF 0 667 0 64 0 72 0 88 200 192 216 264 100 96 108 132 2 POWER PILC 25 kV XLPE MIC 0 54 0 52 0 41 162 156 123 81 78 62 3 CATV QR PARA III PARA I T TR TX TX10 RG6 RG11 RG59 0 88 0 82 0 87 0 89 0 82 264 246 261 267 246 132 123 131 13...

Страница 25: ...3 TYPE 6 TYPE 9 0 78 0 78 0 62 0 78 0 69 234 234 186 234 207 117 117 93 117 104 5 DATA RG58 RG58U THICK ETHERNET THIN ETHERNET RG11 RG6 0 78 0 66 0 78 0 67 0 82 234 198 234 201 246 117 99 117 101 123 For conversion 1 metre 3 28 feet T631 OPERATING MANUAL 25 Radiodetection Ltd 00901209 6 ...

Страница 26: ...xample For polyethylene ε 2 25 PVF 1 225 0667 7 4 3 SHORT LENGTH OF SAME TYPE OF CABLE 1 Measure physical length of the sample 2 Obtain a reading for the apparent length of the cable using any PVF value 3 Adjust the PVF value until the distance reading indicated is the same as the measured length Radiodetection Ltd 00901209 6 T631 OPERATING MANUAL 26 ...

Страница 27: ...ss a specific pulse width is preferred Adjust the AMP controls until the fault reflection is observed If the fault reflection is less than halfway across the screen select a shorter range and a narrower pulse width for optimum results If there is no fault reflection there are two possibilities 1 The cable length is longer than its recorded length In this case increase the range until a reflection ...

Страница 28: ...pand the trace and reposition the cursor more precisely Remember to subtract the length of the test lead if used 7 7 USE OF THE LEFT HAND CURSOR The left hand cursor can be moved to 1 Eliminate the length of the test lead 2 Measure between any two features on the trace 3 When moved the LH cursor becomes the live cursor and changes to a solid line with the RH cursor becoming a broken line Radiodete...

Страница 29: ...ce to fault is now that from the end of the test lead 7 7 2 MEASURING BETWEEN TWO FEATURES Using the LH cursor controls set the LH cursor to the start of the feature on the LH side Using the RH cursor controls set the RH cursor to the start of the feature on the RH side The RH cursor is then live and becomes a solid line with the LH cursor a broken line The distance read out is the distance betwee...

Страница 30: ...he co ax socket Due to the internal wiring of the instrument this may result in the left hand cursor being set a short distance into the displayed transmit pulse especially on the short pulses This is correct and ensures accurate cable length measurements 7 8 FIND FAULT ENSURE RANGE SETTING IS FULL AND NOT EXPANDED ZOOM The FIND FAULT function is a means whereby the unit will automatically scan a ...

Страница 31: ... should first be placed just to the right of the transmit pulse Pressing the FIND FAULT key will start the search This may take several seconds While searching AFF is displayed in place of the usual mode display Searching is carried out on all ranges from the one appropriate to the starting cursor position 6 m range if the cursor starts on zero to 12 Km Gain and Pulse Widths appropriate to the ran...

Страница 32: ... the reflected pulse although its polarity is indicative of the type of fault i e Upwards positive high series impedance Downwards negative low shunt impedance In order to gain a measure of the significance of the reflection it is necessary to compare the amplitude of the reflected pulse with that of the transmitted pulse The amplitude of the reflection resulting from an impedance change relative ...

Страница 33: ... and therefore the reflection co efficient cannot exceed unity It is usual therefore to express the reflection in percentage terms or millirhos mρ where 1000 mρ 1 rho 100 reflection Impedance mismatches can also be expressed logarithmically in terms of Return Loss where Return Loss 20 log 10 At Ar dB or Return Loss 20 log 10 1 ρ dB T631 OPERATING MANUAL 33 Radiodetection Ltd 00901209 6 At Ar ...

Страница 34: ...A conversion chart is given below Radiodetection Ltd 00901209 6 T631 OPERATING MANUAL 34 Reflection Coefficient Return Loss Conversion Chart ...

Страница 35: ... the appropriate key for PULSE WIDTH From the list of options select the pulse appropriate to the measurement On returning to the trace the selected pulse width will be confirmed on the display and the PULSE key will be inoperative The output impedance of the T631 must be set to match the impedance of the cable under test 7 9 1 MEASUREMENT OF RETURN LOSS dBRL Through the HELP Menu select the IMPED...

Страница 36: ...o confirm the location note the distance Press dBRL and the Return Loss in dB will be calculated and displayed on the LCD together with the corresponding reflection co efficient The result is Measured Return Loss which requires correction for Pulse Attenuation Press RS232 key to print results Note this option is not displayed on screen but is available Ensure printer lead is plugged into the instr...

Страница 37: ...essing dBRL is important as the signal level at that point is used as the zero reference Be sure to place the cursor on the flat section of the trace just before the pulse d When measuring very small reflections switching the filter in can improve the performance of the return loss function 7 9 2 MEASUREMENT OF PULSE ATTENUATION This should be determined using a sample length of the same type of c...

Страница 38: ...ndent and will be higher for narrow pulse widths than wider pulse widths The pulse width used for measuring pulse attenuation MUST be the same as that used to measure the Return Loss A library of Pulse Attenuation Cable Loss for different cable types for different pulse widths can be compiled using the procedure detailed in Measurement of Pulse Attenuation 7 10 FILTER A low pass filter is availabl...

Страница 39: ...present in the memory will be overwritten and lost 8 2 RECALLING A STORED TRACE Press the RECALL key and then select the desired memory location The stored trace will then be displayed on the LCD and memory location confirmed The machine parameters are set in accordance with the stored trace and cannot be altered 8 3 COMPARING A LIVE AND STORED TRACE Press the MODE key and select L M The displayed...

Страница 40: ...race moves relative to the stored trace 8 4 DIFFERENCE BETWEEN A LIVE AND STORED TRACE Press the MODE key and then select L M Recall the appropriate stored trace from memory as described earlier The machine parameters are set in accordance with the stored trace If not already connected to the cable under test connect to the cable and observe the trace which is the difference between the live and r...

Страница 41: ... contents can be transferred to a printer or PC via the RS232 interface 9 1 PRINTING A suitable printer is the Seiko DPU 411 21B available in 220 V 50 Hz or 120 V 60 Hz versions Other printers may require a different interface cable and printer set up and details of the RS232 interface is given in the specification Section 12 T631 OPERATING MANUAL 41 Radiodetection Ltd 00901209 6 ...

Страница 42: ...y trace or an L M or L M trace Depress the RS232 key and select menu option 1 PRINTER The display will then display PRINTING as the data is transferred to the printer 9 3 PC TRANSFER A PC software kit X600 TRACEability is available This enables a cable database to be established Data from all memories can be transmitted to and received from a PC See the manual supplied with the software for full i...

Страница 43: ...lp Menu 7 100 ns 4 Operation 8 Operation 8 300 ns 5 1200 ns 6 2 Filter 5 Cable Type Auto 7 Filter ON OFF Telephone 1 Operation 8 Power 2 3 Units CATV 4 7 Help Text Feet 1 IBM 4 Explanation 1 Metres 2 Data 5 2 Time 3 Help Menu 7 3 Help Menu 7 Operation 8 4 Operation 8 6 7 8 8 Operation T631 OPERATING MANUAL 43 Radiodetection Ltd 00901209 6 ...

Страница 44: ...e T631 performs a self test If it fails the following message is displayed INTERNAL MALFUNCTION ERROR XX PLEASE REFER TO MANUAL Please contact your supplier and report the error number Radiodetection Ltd 00901209 6 T631 OPERATING MANUAL 44 ...

Страница 45: ...2 m 800 m x1 x2 x4 x8 0 4 m 1600 m x1 x2 x4 x8 0 8 m 3200 m x1 x2 x4 x8 1 6 m 6400 m x1 x2 x4 x8 3 2 m 12800 m x1 x2 x4 x8 6 4 m T631 OPERATING MANUAL 45 Radiodetection Ltd 00901209 6 Accuracy Typically 0 5 48 m range and above Dielectric PVF 0 300 0 999 V 90 300 m µs V 2 45 150 m µs Cursors 2 Pulse Characteristics Waveform Amplitude Pulse Widths Source Impedance Connector Protection Mode Selectio...

Страница 46: ...ECTION SENSITIVITY Gain Setting Signal for Full Scale Deflection A1 A2 A3 A4 A5 A6 A7 A8 A9 Aa Ab 16 V 8 V 4 V 2 V 960 mV 480 mV 240 mV 120 mV 60 mV 30 mV 15 mV Radiodetection Ltd 00901209 6 T631 OPERATING MANUAL 46 ...

Страница 47: ...Nominal Range PVF 0 667 Default Pulse ns Available Pulses ns 3 m 6 m 12 m 24 m 48 m 96 m 192 m 384 m 800 m 1600 m above 2 2 10 10 30 100 100 300 300 1200 2 10 2 10 2 10 30 2 10 30 2 10 30 100 2 10 30 100 2 10 30 100 300 2 10 30 100 300 1200 2 10 30 100 300 1200 2 10 30 100 300 1200 ...

Страница 48: ...face RS232 to printer or PC Connector 9 pin D Male Configuration 4800 baud no parity 8 bits 1 stop bit PIN FUNCTION DIRECTION 2 Received Data RXD Input 3 Transmit Data TXD Output 5 Ground 6 Data Set Ready DSR Input 7 Request To Send RTS Output Display 240 x 128 pixel LCD 240 x 100 pixel waveform area Radiodetection Ltd 00901209 6 T631 OPERATING MANUAL 48 ...

Страница 49: ...nnector 2 1 x 5 5 x 9 5 mm plug centre positive reverse polarity protection Dimensions 300 x 183 x 75 mm Weight 2 5 kg including batteries carry bag Accessories Carry bag soft weatherproof bag with shoulder strap and accessory pouch AC Adaptors 120 V or 230 V 50 60 Hz see separate specification Test Lead 3 metre 75 Ω BNC BNC BNC Crocodile clip BNC F Adaptor Operating Manual Safety IEC 1010 1 T631 ...

Страница 50: ...tput 15 V DC 400 mA Europe 230 V 10 50 Hz 90 mA Output 15 V DC 400 mA Environmental Safety Main Unit Safety Maximum permissible voltage on input connector for safe operation BS EN 61010 1 1993 and IEC 1010 1 1990 and Amendment 1 1992 30 V RMS Radiodetection Ltd 00901209 6 T631 OPERATING MANUAL 50 ...

Страница 51: ...r Varta RSH2K cells Damp Heat Steady State Damp Heat Cyclic Charging 10 C to 35 C Discharging 5 C to 45 C Storage 0 C to 45 C BS 2011 part 2 1 Ca 1977 IEC 68 2 3 1969 40 C 93 RH 4 days BS 2011 part 2 1 Db 1981 IEC 68 2 30 1980 25 C 95 RH 12 hr 55 C 93 RH 12 hr 6 cycles Low Air Pressure BS 2011 part 2 1 M 1984 IEC 68 2 13 1983 Non operational 150 mb 16 hours Operational 533 mb 30 minutes T631 OPERA...

Страница 52: ...t Ea IEC 68 2 27 1987 50g 11ms in soft carry case BS EN 60068 2 29 1993 part 2 test Eb IEC 68 2 29 1987 40g 6ms 1000 bumps in each of 3 axes in soft carry case Free Fall Water and dust Protection BS EN 60068 2 32 1993 part 2 test Ed IEC 68 2 32 1975 1m in soft carry case BS EN 60529 IEC 529 1989 To IP54 Radiodetection Ltd 00901209 6 T631 OPERATING MANUAL 52 ...

Страница 53: ... QUALITY Bicotest Limited is a BS EN ISO 9001 registered company 13 2 POWER SUPPLY a The instrument is fitted with eight rechargeable NiCad batteries type R14 with capacity of 2 Ah Replacement batteries must be of similar type preferably Varta type RSH2K A quick blow fuse that is not accessible to the operator is fitted to protect the battery circuit b The instrument can also be powered with an ex...

Страница 54: ... must not be incinerated Additionally some of the electronic components included in the assembly are constructed with resins and other chemicals which produce toxic fumes during incineration It is required that the instrument is submitted to the correct authority for disposal in accordance with local by laws b Acidic or Caustic Compounds Some of the electronic components included in the assembly p...

Страница 55: ...or transportation over long distances the instrument should be suitably packed in a box filled with shock absorbing material such as bubblepack or corrugated cardboard 13 6 STORAGE The instrument should be stored in a dry clean environment The NiCad batteries will self discharge within three months and it will be necessary to fully charge the batteries which takes 14 hours using the recommended AC...

Страница 56: ... Protective Clothing Not necessary for operating the T631 providing that normal safe working practice is observed b Working Environment No special precautions are needed for operating the T631 Appropriate precautions must be observed for potentially hazardous working environments such as construction site installations electricity substations explosive atmospheres etc Radiodetection Ltd 00901209 6...

Страница 57: ...R T120A For safe hand held fault sectioning on medium voltage networks M225 Cable and Pipe locator For location and route tracing of cable and pipes LEXXI T810 A universal hand held TDR for use on all types of metallic cable including live AC when used with the blocking filter lead T600 Series TDRs World class user friendly cable fault locators which feature interface with PCs via X600 TRACEabilit...

Страница 58: ... Fault Prelocate Fault Pinpoint Fault Pinpoint Fault Locate Fault Locate Fault Sheath Fault Resistance HV Faults Intermittent Flashing or High TDR VIXXON S3000 SP TM VIXXON S3000 SP TM BOXXER S4000 TM BOXXER S4000 TM AXXIS S5000 TM AXXIS S5000 TM LV Fault Diagnosis HV Fault Diagnosis BOXXER S4000 TM LV HV Fault Diagnosis AXXIS S5000 TM T272 High Resistance Fault Locator LINXX B110 TM FIX FAULT Loc...

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