Radiodetection 3300 Operation Manual
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Radiodetection 3300 Operation Manual

Radiodetection 3300 Operation Manual

Twisted pair/metallic time domain reflectometer
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Model 3300
Twisted Pair/Metallic Time Domain Reflectometer
Operation Manual
2 5 0 - 0 0 23 - 0 3

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Summary of Contents for Radiodetection 3300

  • Page 1 Model 3300 Twisted Pair/Metallic Time Domain Reflectometer Operation Manual 2 5 0 - 0 0 23 - 0 3...
  • Page 2 Thank you for purchasing Radiodetection's Model 3300 Metallic Time Domain Reflectometer. Our goal is to provide you with a high quality troubleshooting tool which is both powerful and easy to use. We all share a commitment to quality and excellence and will do our best to continue to provide you with test equipment to meet your needs.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION 1: GENERAL INFORMATION....4 SECTION 4: APPLICATION NOTES......30 Safety Information...........4 Locating Splits and Resplits......30 Introduction ............5 Locating Bridged Taps........31 General Features..........6 Moisture in Twisted Pair........40 Locating Intermittent Faults......42 SECTION 2: OPERATING PROCEDURES....6 Theory of Operation...........6 SECTION 5: WAVEFORM EXAMPLES....44 Front Panel Description ........8 Instrument Operation........16...

  • Page 4: General Information

    SECTION 1: GENERAL INFORMATION Warnings Before using, review all safety precautions. Note and ob- 1.1 Safety Information serve all warning and caution statements on the equipment Symbols: and in the documentation. Caution: Refer to accompanying Do not operate this instrument near flammable gases or documents fumes.

  • Page 5: Introduction

    1.2 Introduction be taken not to expose the equipment to extreme tempera- tures. To ensure that your Model 3300 will be ready to use, The Model 3300 is a multipurpose metallic time domain store the instrument indoors during extreme hot or cold reflectometer, cable fault locator.

  • Page 6: General Features

    1.3 General Features SECTION 2: OPERATING PROCEDURES Locates cable and connector faults in all types of twisted 2.1 Theory of Operation pair telephone cables. A Time Domain Reflectometer (TDR) works on the same Compact, lightweight, portable. basic principle as radar. Pulses of energy are transmitted down the cable under test.
  • Page 7 In either case, a substantial amount of energy will be re- The Model 3300 displays the cable under test as a digi- flected. If it were possible to have a cable with no loss, all tized waveform and a numeric distance readout on the Liq- of the signal energy would be reflected.

  • Page 8: Front Panel Description

    P u l s e = 1 0 0 n s e c V O P V G a i n= 4 x V O P = 6 5 % ▲ ▼ 1 3 1 f t L 1 : 1 5 d B R L CURSOR CURSOR Model 3300...
  • Page 9 Keypad the cable distance displayed on screen. Pulse width and I/O Use the I/O key to turn the instrument on and off. vertical gain are automatically adjusted for each range. Backlight Use the backlight key to turn the electrolumi- Cursor Use the two arrow keys to move the cursor left nescent backlight on or off.
  • Page 10 Back panel description RS-232 CHARGER LINE 1 LINE 2...
  • Page 11 The Model 3300 has three connectors on the back panel. RS-232 Serial I/O Port enables the operator to transfer waveforms to a printer. The Model 3300’s battery pack is charged by plugging the external battery charger into the charging socket and AC power.
  • Page 12 1 5 d B R L waveform display modes. Additional messages are dis- B ala nc e B a tt played when utilizing the standard and optional waveform storage functions. B. PULSE WIDTH. Model 3300 has selectable pulse widths for testing various lengths of cable.
  • Page 13 C. VERTICAL GAIN. Displays the level of vertical am- H. DISTANCE BETWEEN CURSORS. Model 3300 au- plitude or gain applied to the waveform. tomatically calculates and displays the distance between the 1st and 2nd cursors or between a cursor and the zero D.
  • Page 14 Pop-up menu Recall Use the * key to recall a stored waveform from Pulse Use the two icon keys to decrease and increase the memory and display the list of the stored waveforms. pulse width. Overlay Use the two icon keys to adjust the trace separa- VOP or V/2 (depending on the velocity format setting cho- tion in dual waveform display modes.
  • Page 15 Cable Use the two icon keys to scroll through a menu of cable types in order to obtain the correct VOP of the cable being tested. P r e s s t o s e l e c t . P u l s e O v e r l a y V O P...

  • Page 16: Instrument Operation

    to the right. The exact length of cable on the screen for 2.3 Instrument Operation each range will be relative to the VOP being used. When Proper operation and precise distance readings will be en- using Range, you still have complete manual control and sured if you remember the following procedures and choose can change the pulse width, zoom-level and other key func- the mode of operation to best suit your cable testing con-...
  • Page 17 Distance readout format may be selected in the setup menu tion regardless of distance or horizontal zoom settings. as either single distance cursor or dual distance cursor. Model 3300's unique dual independent cursors allows you Single Cursor Operation to place cursors at, and measure to (or between) ANY TWO Single cursor operation uses a single distance cursor to POINTS on the waveform.
  • Page 18 culated and displayed. Distance is determined from the cur- transmitted pulse, but from the first cursor to the second sor placement on the waveform. Therefore, the accuracy cursor. Accuracy of the distance reading is dependent on of the cursor placement is crucial for accurate readings. the placement of the cursors and an accurate VOP.
  • Page 19 Difference between live and stored and out, and the cursors moved, without affecting the IFD Stored Stored (recall) waveform function. The Model 3300 will monitor the cable, waiting for an intermittent fault to occur. Display Mode Loops Line 1 Recall...
  • Page 20 1. The waveform can be adjusted as if it were a live waveform. The Horizontal Zoom control expands and contracts the 2. Make sure the Model 3300 battery is fully charged. waveform around center screen. This control can be used In the IFD mode, if the instrument battery level goes...
  • Page 21 2.3.8 Setup Options Menu The Balance Control matches the instrument to the im- Before using the Model 3300, there are several setup op- pedance of the cable under test and cancels the output pulse tions you can choose from. The options chosen will re- out of the waveform display.
  • Page 22 (VOP) or as meters or feet per microsecond velocity divided by 2 (V/2). Model 3300’s SUPER-STORE waveform storage capabil- ity allows the operator to store a waveform for later com- The cancel test lead length option allows the user to auto- parison and analysis.
  • Page 23 The Model 3300 comes standard with 16 SUPER-STORE If any waveforms are currently stored in memory, the op- waveform memory locations. The waveform(s) will remain erator may choose the stored waveform by scrolling to the in storage, even after the instrument is switched off.
  • Page 24 The Model 3300 is powered by a rechargeable battery pack contained within the instrument. The Model 3300 is shipped The Model 3300 will operate while charging as long as the from the factory with a full charge and will operate ap- battery level indicator is above a quarter charge.

  • Page 25: Section 3: Tdr Fundamentals

    Cables are connected to the Model 3300 by way of banana the reflection holds one position, the cable is damaged and jack connectors. A banana jack connector provides the ver- the Model 3300 will show that a fault exists in the cable.

  • Page 26: Cable Impedance

    When testing a section of cable where different types of The Model 3300 uses an output pulse balance circuit that cable are spliced together, use the independent cursors and cancels the output pulse out of the waveform display and the correct VOP for each section of cable to yield the most matches the instrument to the cable under test.
  • Page 27 Connect the cable under test to the be incorrect. Testing a cable from both ends is the most Model 3300 and set the cursors to the zero distance common and most accurate method of eliminating VOP marker and the leading edge of the reflected pulse.

  • Page 28: Pulse Widths

    adjustment factor. Next, multiply each of the TDR read- NOTE: Always start the fault finding procedure in ings by the adjustment factor. The result will be the cor- the shortest pulse width available, the fault may rected length readings. be only a short distance away. Use the zoom and gain controls.

  • Page 29: Noise Filter / Powered Cable

    Model 3300 has multiple pulse If you must test a powered cable, the Model 3300 features widths which the operator can select to best accommodate NOISE FILTERS which allow the testing of cables with the cable length being tested. However, since the location some signal or power present.

  • Page 30: Section 4: Application Notes

    TER will automatically engage if power is present on a single filter will eliminate all of these signals. Riser-Bond cable under test. Testing cable with power present may Instruments’ waveform TDRs have multiple types and lev- cause instrument damage. The auto-filter option may also els of filters which eliminate almost any type of problem.

  • Page 31: Locating Bridged Taps

    Connect one pair of the split pair to Line 1 and the other and, therefore, the TDR’s reflection will be small. If the pair to Line 2. Set the Model 3300 to display Line 1 and split is close, it can be identified. If, on the other hand, adjust the 1st cursor to the “0”...
  • Page 32 The definition of a bridged tap itself can often times Point B: (downward reflection) the point of a bridged cause confusion. Some people refer to a bridged tap as tap on the main cable a lateral which extends off of a main cable. However, Point C: the end of the lateral Point D: the end of the main cable circuit the true definition of a bridged tap is the point on the...
  • Page 33 A common mistake when testing through bridged taps is to mis-identify the end of the lateral for the end of the main cable circuit. As shown below, Figures 1a and 1b show two different cable plant layouts. However, the resulting waveforms are identical. Figure 1b In Figure 1a, the length of the lateral is shorter than the end of the main cable circuit.
  • Page 34 of the lateral; it may be the end of the cable, depending on the layout of the network. It is always a good idea to refer to plant maps whenever possible to help minimize confusion or errors, espe- cially when testing through bridged taps. Remember, a TDR will test through a bridged tap displaying a waveform of the cable under test, including The distance between the two cursors is the distance...
  • Page 35 The distance between the two cursors is the distance The distance between the two cursors is the distance from the TDR to the end of the lateral. from the TDR to the end of the main cable. There is no need to subtract the length of the lateral.
  • Page 36 The distance between the two cursors is the length of the The distance between the two cursors is the distance lateral. from the bridged tap to the end of the main cable.
  • Page 37 When testing through a bridged tap, it can be difficult to Figure 3 is a waveform from the cable plant layout in determine if the reflection caused by a fault is located in Figure 1a. The reflection caused by a fault is obviously the lateral or in the main cable section beyond the located in the main cable beyond the point of the bridged tap point, as illustrated in Figure 2.
  • Page 38 Another example of how bridged taps can be misinter- preted is shown below: In Figure 4, there appears to be a short at Point B on the waveform. However, the waveform shown in Figure 4 is actually the same wave- form shown in Figure 5.
  • Page 39 Ghost reflections can appear when testing through bridged taps. Referring to Figure 6a, it appears as though there is a partial open at Point E. This cannot be true as the cable physically ends at Point D. Referring to the cable plant layout in Figure 6b, the ghost is caused when the signal returning from Point D passes Point B.

  • Page 40: Moisture In Twisted Pair

    A good clue that a reflection is actually a ghost from a 4.3 Moisture in twisted pair bridged tap, is that the distance from the end of the cable to the ghost is the same length as the lateral itself (the A subscriber complained about a noisy telephone line.
  • Page 41 The cable was tested with a TDR and an undocumented By testing the cable from both ends and recording the splice was found. Close examination of the splice distance to fault in all pairs, it is possible to determine showed it to be totally saturated with water. The cable approximately how much cable is affected.

  • Page 42: Locating Intermittent Faults

    The location and how much cable is affected is now plains of noisy static or no dial tone. The problem is known. But it is still necessary to locate where the water usually a high resistance series fault or intermittent actually entered the cable.
  • Page 43 1. Disconnect at the lightning protector on the subscriber end. 7. Wait for the fault to occur. The Model 3300 will dis- play a live waveform, while monitoring the line for any 2. Confirm the trouble. Connect a butt set, turn the speaker intermittent waveforms.

  • Page 44: Section 5: Waveform Examples

    Practice testing various known cable segments, with and SECTION 5: WAVEFORM EXAMPLES without components. Become familiar with how each seg- A great variety of waveforms may be encountered. This is ments looks prior to any problems. due to the various applications and electrical and environ- mental characteristic differences found in the wide variety The following pages contain samples of waveforms you of cables that exist today.
  • Page 45 P r e s s P r e s s f o r m e n u . f o r m e n u . L i n e 1 P u l s e = 1 0 0 n s e c V O P L i n e 1 P u l s e...
  • Page 46 P r e s s P r e s s f o r m e n u . f o r m e n u . L i n e 1 P u l s e = 1 0 0 n s e c V O P L i n e 1 P u l s e...
  • Page 47 P r e s s P r e s s f o r m e n u . f o r m e n u . L i n e 1 P u l s e = 2 5 n s e c V O P L i n e 1 P u l s e...
  • Page 48 P r e s s P r e s s f o r m e n u . f o r m e n u . L i n e 1 P u l s e = 1 u s e c V O P L i n e 1 P u l s e...
  • Page 49 P r e s s P r e s s f o r m e n u . f o r m e n u . L i n e 1 P u l s e = 5 n s e c V O P L i n e 1 P u l s e...
  • Page 50 Test First series Second series End of point resistance series cable (Point A) at 500 ft resistance at 2000 ft (5 Ohm) at 1500 ft (Point B) (30 Ohm) P r e s s f o r m e n u . Description of test setup, measuring from the near end.
  • Page 51 Test First series Second series End of point resistance series cable (Point A) at 500 ft resistance at 2000 ft (30 Ohm) at 1500 ft (Point B) (5 Ohm) P r e s s f o r m e n u . Description of test setup, measuring from the far end.
  • Page 52 The next two waveforms illustrate how changing one set- ting can change the way a waveform appears. Both tests are of the same cable. Only the pulse width setting of the instrument has been changed. P r e s s P r e s s f o r m e n u .

  • Page 53: Section 6: Maintenance

    If the unit is regularly operated in harsh, dusty or wet envi- SECTION 6: MAINTENANCE ronments, inspect after every use. Cleaning Remove dust from the outside of the instrument and con- The instrument should be inspected and cleaned periodi- nectors with a lint free cloth or a small, soft brush. cally.
  • Page 54 Service There are no user serviceable parts on or in this instru- ment. It is recommended that service of any type, to the instrument or any accessories, be referred to Riser-Bond Instruments or another authorized repair facility. Warning: To avoid risk of electric shock, do not perform service of any type to the instrument or any accessory.

  • Page 55: Section 7: Specifications

    SECTION 7: SPECIFICATIONS Distance Accuracy: +/- 0.5 ft (0.15 m) plus +/- 0.01% of reading Specifications for Model 3300 Safety: EN61010-1 Physical - Instrument Only Height: 4.7 inches (120 mm) Display: Width: 9.5 inches (240 mm) 320 x 240 dot-matrix liquid crystal display with Depth: 2.4 inches (60 mm)
  • Page 56 Vertical Resolution: Input Protection: 14 bits with 170 dots displayed 400 V (AC+DC) from DC to 400 Hz, decreasing to 10 V at 1 MHz Vertical Sensitivity: Greater than 56dB Velocity of Propagation: Two user-selectable display formats VOP (%) with 2 digit precision ranging from 30% to 99% Maximum Range: V/2 with 3 digit precision (feet or meters per microsecond) 63,700 ft (19.4 km) at 99% VOP...

  • Page 57: Appendix A

    Roman Font Lock: Epson LQ-860 Emulation Line Spacing: 6 LPI The Riser-Bond Instruments Model 3300 will print to an Character Set: Italics Epson LQ-860 type printer through the Epson LQ-860 com- Code Page: mand set. Serial communication parameters: no parity, two-...

  • Page 58: Appendix B

    This printer may be connected to the Model 3300 with a DB- APPENDIX B 9 female to AMO178234-4 cable. This cable must be wired VOP Table - Twisted Pair in a Null modem fashion (transmit to receive, receive to trans- mit).

  • Page 59: Warranty

    Repaired parts or replacement products will be provided ix Adjustments or adaptations without by Radiodetection on an exchange basis and will be either product such as non rechargeable batteries, bulbs, Radiodetection’s prior written consent, including: new or refurbished to be functionally equivalent to new.
  • Page 60 Unit H1, 101 Rookwood Road, Yagoona NSW 2199, Australia Tel: +61 (0) 2 9707 3222 rd.sales.au@spx.com www.radiodetection.com Copyright © 2017 Radiodetection Ltd. All rights reserved. Radiodetection is a subsidiary of SPX Corporation. Radiodetection is a registered trademark of Radiodetection in the United States and/or other countries. Due to a policy of continued development, we reserve the right to alter or amend any published specification without notice.

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