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Radiodetection 1205CXA, Руководство оператора

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28

SECTION 5:  WAVEFORM EXAMPLES

A  great  variety  of  waveforms  may  be  encountered.  
This is due to the various applications and electrical 
and environmental characteristic differences found in 
the wide variety of cables that exist today.

Remember: The reflection of a fault or component will 
look different on a short length of cable than it will on 
a long length of cable.

Various  industries,  cable  types,  and  components 
produce many different waveforms.  The TDR's pulse 
width, horizontal zoom, and vertical gain settings all 
affect how a waveform will appear.

Practice testing various known cable segments, with 
and without components.  Become familiar with how 
each segment looks prior to any problems.

A reflection with the same polarity indicates a fault with 
OPEN  (high  impedance)  tendencies.    The  reflection 
shown at the 2nd cursor is a complete open.

 

Line 1 

Pulse 

=  2 nsec 

 

VOP

 

 

V Gain 

=  2 x

 

 

VOP 

=  83%

 L1 =6 dBRL

  

 

 

   

Batt

P r e s s    

*

 

1 7 8  ft

                  5 4 m

1

2

Содержание 1205CXA

Страница 1: ...Model 1205CXA Coaxial Metallic Time Domain Reflectometer Operator s Manual January 2007 Advanced Test Equipment Rentals www atecorp com 800 404 ATEC 2832 Established 1981 ...

Страница 2: ... you with test equipment to meet your needs Please read the operator s manual thoroughly to ensure the best results from your TDR As always Riser Bond Instruments welcomes your comments and suggestions Radiodetection 154 Portland Road Bridgtonr ME 04009 USA Tel 207 647 9495 Toll Free 877 247 3797 Fax 207 647 9496 E mail bridgton radiodetection spx com Radiodetection Ltd Western Drive Bristol BS14 ...

Страница 3: ...19 3 4 Cable Impedance 19 3 5 Velocity of Propgation VOP 19 3 6 Pulse Widths 21 3 7 Return Loss Fault Severity 22 SECTION 4 APPLICATION NOTES 23 4 1 TDR Tap Plate Connector 23 4 2 Missing Signals Corroded Splices and Unidentified Cables 24 4 3 Detecting Intermittent Faults 24 4 4 Measuring and Documenting 25 4 5 Detecting Theft of Service 26 SECTION 5 WAVEFORM EXAMPLES 28 SECTION 6 MAINTENANCE 36 ...

Страница 4: ...or fumes Do not modify any part or accessory of this instrument If the unit is damaged do not use Also secure the product from use by others To avoid electric shock do not remove covers or any parts of the enclosure If the instrument or any associated accessory is used in any manner not detailed by the accompanying documentation the safety of the operator may be compromised Caution As with most el...

Страница 5: ...e measured and displayed as both a waveform and a numeric distance to the fault The Model 1205CXA will test all types of metallic paired cables for opens shorts impedance discontinuities and many other cabling problems 1 3 General Features Locates cable and connector faults in all types of paired metallic cables Tests both twisted pair and coaxial cables Sensitive sub nanosecond pulse width locate...

Страница 6: ...a cable with no loss all of the signal energy would be reflected The incident and the reflected signals would look identical Reflections from an impedance higher than the char acteristic impedance of the cable are in phase or upward Reflections from an impedance lower than the characteristic impedance of the cable are out of phase or downward Inductive faults cause the TDR to display an impedance ...

Страница 7: ...ption ZOOM OUT ZOOM IN VGAIN VGAIN BACK LIGHT WAVEFORM POSITION CURSOR1 CURSOR1 CURSOR2 CURSOR2 MODEL 1205CXA High Resolution Metallic TDR Cable Fault Locator SERIAL I O RANGE RANGE CONTRAST CONTRAST CABLE RS 232 CHARGER 12V ...

Страница 8: ...screen Pulse width and vertical gain are automatically adjusted for each range Cursors The 1st and 2nd cursor keys move the cur sors along the waveform Use the 2nd cursor arrows to move the second cursor to the point of interest on the waveform Cursors should be set on the leading edges of the reflection A menu will pop up when the asterisk key is pressed The unlabeled icon keys control a selectio...

Страница 9: ...ilizing the standard and optional waveform storage functions B Pulse Width Model 1205CXA has selectable pulse widths for testing various lengths of cable C Vertical Gain Displays the level of vertical am plitude or gain applied to the waveform D VOP or V 2 The programmed velocity of propa gation is displayed as a percentage of the speed of light from 30 to 99 E Menu Pop up menu for selecting instr...

Страница 10: ...H Battery Level Indicator A horizontal bar graph indicates the battery level When the battery level reaches the one quarter full scale mark the low battery message is activated I Distance Markers These tick marks are displayed along the top of the screen and can be in feet or meters format These marks enable the operator to view the distance along the cable being tested J Fault Severity The Model ...

Страница 11: ...the available software filters Setup Use the key to display the setup options menu Print Use the key to print the on screen waveform to a serial printer for documentation Mode Use the two icon keys for cycling through the available display modes for single dual or difference waveform display modes Overlay Use the two icon keys to adjust the trace sepa ration in dual waveform display modes This con...

Страница 12: ...ransmitted pulse is on the left side of the screen and the cable span is shown to the right The exact length of cable on the screen for each range will be relative to the VOP being used When using range you still have complete manual control and can change the pulse width zoom level and other key functions as needed With the distance format set in feet mode and a 83 VOP the ranges are 10 20 50 100...

Страница 13: ...ed from the cursor placement on the waveform Therefore the accuracy of the cursor placement is crucial to accurate readings For greatest accuracy place the 1st cursor to the 0 distance marker and the 2nd cursor at the leading edge of the reflected pulse To set the cursors zoom in on the point of interest us ing HORIZONTAL ZOOM Set the first cursor by using the 1st cursor left and right arrows to t...

Страница 14: ...from memory the Mode control will cycle through display modes involving the coaxial test port and the recalled waveform The loop described below applies to the test port Line Stored Displays Live and Stored waveforms simultaneously Line Stored Displays difference between Live and Stored waveform Stored Displays Stored waveform only Line Displays Coax active test port waveform To exit the recalled ...

Страница 15: ...horizontal position controls increase or decrease the vertical gain zoom in or out and move the cursors When zooming during the IFD mode the instrument may need to pause slightly to fill in additional waveform data During the IFD mode do not change the pulse width or range If the pulse width is changed the IFD routine will reset and start collecting data at the new pulse width The intermittent fau...

Страница 16: ...able under test which sets the VOP control to the correct value The VOP control can still be changed at any time by the operator if a different VOP value is required 2 3 8 Setup Options Menu Before using your Model 1205CXA there are several setup options you can choose The options you choose will remain selected even when the instrument is turned off Options available Horizontal Scale Units FEET o...

Страница 17: ...e to disable the cancel test lead length The serial printer option is used to select the type of serial printer for RS232 printing The options available are Seiko DPU 411 thermal printer and the Citizen PN60 plain paper printer The Auto Filter option enables or disables automatic software noise filtering When enabled the software noise filtering will automatically be activated if a high level of e...

Страница 18: ...ons will operate normally SUPER STORE will optimize the distance and resolution of a stored waveform based on the pulse width of the test The following table describes minimum distances versus pulse width of a stored waveform Pulse Width Coax Distance 83 VOP Sub nsec 450ft 180m 2 nsec 1 500ft 590m 25 nsec 5 000ft 1 970m 100 nsec 10 000ft 3 940m 500 nsec 15 000ft 5 900m 2 3 10 Noise Filter Powered ...

Страница 19: ...rference Each touch of the FILTER key engages a different type or level of filter Try each of the filters to determine which filter works the best for each test TDRs are used in a variety of industries and applications With the various types of test surroundings also comes various types of signals which can affect the performance of a TDR Signals such as power 50 to 400 Hz audio 100 Hz to 20 000 H...

Страница 20: ... illuminated while the charger is plugged in The Model 1205CXA will operate while being charged as long as the battery level indicator is above a quarter charge Allow at least 16 hours charging time for the batteries to cycle from a completely discharged state to a fully charged state The Model 1205CXA may be operated while the batteries are charging but this will increase the charging time The Mo...

Страница 21: ...are spliced use the independent cursors and the correct VOP for each section of cable to yield the most accurate reading 3 4 Cable Impedance Any time two metallic conductors are placed close together they form a transmission line which has a characteristic impedance A TDR tests for a change in impedance which can be caused by cable damage faulty splices water ingress change in cable type improper ...

Страница 22: ...path of the cable With a measuring wheel or tape measure the exact length of the cable being tested Set the VOP according to the manufacturer s specifications test the cable from one end and record the fault distance reading Next using the same VOP setting test from the opposite end of the cable and again record the fault distance reading If the sum of the readings is the exact length of the cable...

Страница 23: ...lt If the fault is not located adjust to the next range or larger pulse width and retest Keep adjusting to the next larger pulse until the fault is located Cable Loss Cable has loss A signal attenuates as it travels down a cable Some cables have greater loss or signal at tenuation than others Because the pulse amplitude is reduced by the loss in the cable major faults at long distances will appear...

Страница 24: ...all the energy so its return loss is zero Remember the larger the dBRL reading the smaller the problem and vice versa The Model 1205CXA can be set up to display dBRL in two possible modes Total dBRL and Fault dBRL Total dBRL displays the dBRL of the fault plus the attenuation of the cable or cable loss Fault dBRL displays the dBRL of the fault and factors out the attenuation of the cable or cable ...

Страница 25: ...onnector to one tap port and the output con nector to the other tap port This makes the two tap ports independent from each other and used to test in either direction from the tap To find a location for the wire jumper look for a coil connection from the IN to the OUT port which passes any power signal on the cable through the tap Solder one end of a wire jumper to one side of the removed coil loc...

Страница 26: ...us problem Then repair the faulty part of the cable Corroded Splices Within many systems there are a lot of cable splices Many are old and their locations are unknown With most splices it is just a matter of time before they go bad Use a TDR to locate corroded splices that need to be repaired Identifying Cables If no markings were used during construction one can go back with the aid of a plant ma...

Страница 27: ...onvenient and easy comparison when problems arise at a later date Cables can be periodically monitored for signs of deterioration SUPER STORE and WAVE VIEW provide a variety of opportunities and applications not found with any other TDR SUPER STORE Waveform Storage is a unique storage feature of Riser Bond Instruments waveform TDRs SUPER STORE waveform storage stores all of the waveform informatio...

Страница 28: ...nt the time and date and possibly confiscate the coaxial cable 2 Test and store the line connected to the house with the TDR every time you see an illegal tap For safety reasons it is usually necessary to test the cable and store the information as quickly as possible Once connected SUPER STORE allows the technician to store the waveform in different settings in a matter of seconds Later the infor...

Страница 29: ...ed to a device or not If it is connected to a television VCR or cable box it will display a lowering of impedance characteristic or downward reflection If the cable is not connected to a device and just lying on the ground it will be displayed on the screen as a complete open or upward reflection All stored waveforms can be uploaded to WAVE VIEW software It provides the same flexibility as the SUP...

Страница 30: ...cable Various industries cable types and components produce many different waveforms The TDR s pulse width horizontal zoom and vertical gain settings all affect how a waveform will appear Practice testing various known cable segments with and without components Become familiar with how each segment looks prior to any problems A reflection with the same polarity indicates a fault with OPEN high imp...

Страница 31: ...dBRL Batt P r e s s 8 7 ft 2 6 m 2 1 A reflection with the opposite polarity indicates a fault with short low impedance tendencies The reflection shown at the 2nd cursor is a dead short The middle reflection at the 2nd cursor is a partial open followed by a complete open end of the cable The more severe the fault the larger the reflection ...

Страница 32: ...o attenuation the reflections caused by each equally spaced taps are progressively smaller A larger reflection 2nd cursor beyond a smaller reflection may indicate an unterminated or faulty tap Line 1 Pulse 2 nsec VOP V Gain 20 x VOP 83 L1 22 dBRL Batt P r e s s 1 5 2 ft 4 6 m 2 1 Line 1 Pulse 25 nsec VOP V Gain 1 x VOP 83 L1 22 dBRL Batt P r e s s 9 1 ft 2 8 m 2 1 ...

Страница 33: ...1 Two sections of cable with a splice shown at the 2nd cursor The amount of reflection caused by the splice is directly proportional to the quality of the splice A good splice small reflection a bad splice large reflection Coaxial taps both indoor and outdoor will cause reflections along the waveform The quality and value of each tap determines the amount of reflection ...

Страница 34: ...of each of the cable lengths A water soaked cable will display a waveform with a downward slope indicating the beginning of the water and an upward rise at the end of the water Generally the area between the two reflections will appear noisy Line 1 Pulse 2 nsec VOP V Gain 8 x VOP 83 L1 45 dBRL Batt P r e s s 50 ft 1 5 m 2 1 2 Line 1 Pulse 2 nsec VOP V Gain 12 x VOP 83 L1 36 dBRL Batt P r e s s 55 ...

Страница 35: ...L1 16 dBRL Batt P r e s s 4 8 4 ft 1 4 8 m 2 1 A properly TERMINATED cable will absorb the TDR signal resulting in no reflection Faults prior to the termination may appear as reflections along the waveform Testing through to an antenna usually results in a S shaped reflection although reflections can vary greatly depending on the antenna ...

Страница 36: ...ult in a cleaner waveform Mechanical inner connectors known as bullets con necting sections of broadcast transmission line some times burn open causing power outages These bullets can be detected by a TDR Line 1 Pulse 25 nsec VOP V Gain 32 x VOP 83 L1 49 dBRL Batt P r e s s 5 2 ft 1 6 m 2 1 Line 1 Pulse 25 nsec VOP V Gain 128 x VOP 83 L1 19 dBRL Batt P r e s s 4 9 1 ft 1 5 0 m 2 1 ...

Страница 37: ...1 Pulse SUB nsec VOP V Gain 104 x VOP 83 L1 38 dBRL Batt P r e s s 5 2 ft 1 6 m 2 1 The three events seen in this section of 750 CATV hardline are a minor dent a major dent and a questionable splice The horizontal zoom and vertical gain keys allow the operator to view these three crimps more closely ...

Страница 38: ... and cleaned pe riodically Inspect the front panel connectors for dirt broken or deformed insulation and contacts Clean or replace as necessary Inspect cable accessories for damaged insulation bent or broken clips Replace as necessary Warning To avoid risk of electric shock do not per form service of any type to the instrument or any ac cessory Service There are no user serviceable parts on or in ...

Страница 39: ...km at 80 VOP Range varies with VOP Maximum testable cable lengths varies with pulse width and cable type Display 320 x 240 dot matrix liquid crystal display with cathode fluorescent CFL backlighting Power Battery Internal rechargeable 7 2V Nickel Metal Hydride Charging Source External 12 VAC transformer 1 3 A Operating Time greater than 6 hours continuous without backlight operating Output Signal ...

Страница 40: ...ngfrom30 0 to 99 9 V 2 with 4 digit precision feet or meters per microsecond ranging from 45 0 to 148 0 in meters mode or from 148 0 to 487 0 in feet mode Standard Accessories Operator s manual battery charger accessory bag shoulder strap BNC F adapter WAVE VIEW Software disks RS 232 cable RG 59 push on probe COAX VOP card Optional Accessories Extendedwaveformstorage extendednoisefilters strand ho...

Страница 41: ...n Font Lock Off Line Spacing 6 LPI Character Set Italics Code Page USA Space Skip Enable Stylewriter Auto Protocol DTR Emulation Epson Pitch 10 CPI Compress Off Form Length 11 letters Slash Zero On Internal Char Set USA Auto LF Off Power Off 3 minutes Baud Rate 9 600 APPENDIX B VOP Table CATV CABLE VOP CABLE VOP Belden Scientific Atlanta RG 59 Foam 78 RG 59 81 Solid 66 Trunk 87 Capscan Times Fiber...

Страница 42: ...atures 3 Filters 9 Front panel 5 H Horizontal zoom 11 I Impedance 19 Instrument disposal 35 K Keypad 6 L Liquid crystal display 7 M Maintenance 35 Menu 9 10 O Operation 10 Operation Theory 4 P Pulse Width 20 Printer 38 R Range 10 Recall 15 RS 232 18 S Service 35 Set up options 14 Start up 18 Storage 15 Specifications 36 V Velocity of propagation 19 Vertical gain 14 W Warnings 2 Waveform examples 2...

Страница 43: ...7 247 3797 FAX 207 647 9496 E MAIL BRIDGTON RADIODETECTION SPX COM This warranty will be void if products manufactured by Riser Bond Instruments are modified by the purchaser during the period of warranty without Riser Bond Instruments written consent This warranty is expressly made in lieu of all other warranties expressed or implied including merchantability whether arising by law custom or cond...

Страница 44: ...09 USA Tel 207 647 9495 Toll Free 877 247 3797 Fax 207 647 9496 E mail bridgton radiodetection spx com 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 ...

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