3M Dynatel 900 Series Operator's Manual
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3M Dynatel 900 Series Operator's Manual

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3M Dynatel 965 Specs
Provided by www.AAATesters.com
TM
Dynatel
900/900M Series
Test Set
Operators Manual
September 1996
78–8093–0453–4 Revision D

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Summary of Contents for 3M Dynatel 900 Series

  • Page 1 3M Dynatel 965 Specs Provided by www.AAATesters.com Dynatel 900/900M Series Test Set Operators Manual September 1996 78–8093–0453–4 Revision D...
  • Page 2 Dynatel 900/900M Series Test Sets Operators Manual The information in this manual is proprietary to 3M and may not be reprinted or otherwise copied without the express written permission of 3M. 1996 Minnesota Mining & Manufacturing Company...

  • Page 3: Table Of Contents

    Table of Contents Section One – Operation 1. INTRODUCTION ......2. 900/900M SERIES TEST SETS .
  • Page 4 Section Three – Specifications 2. 955/955M COMBINATION FAULT LOCATOR 67 A. Measurements ......B. Resistance Fault Locate .
  • Page 5 Comments concerning the contents or organization of this document, as well as suggestions for improvement are welcomed. Direct comments to: 3M Telecom Systems Division Lab-Technical Communications 6801 River Place Blvd. Austin, TX 78726–9000 For Technical Service call 800/426 8688 (outside the U.S.A.

  • Page 6: Section One - Operation

    How to Use This Manual Although your test set may not have all the functions described here, all the 900 Series test sets tell you what to do at every step, including where to connect the test leads. Turn to the tabbed pages for information about each test. Section One –...
  • Page 7 Glossary of Terms 3M 1020B: Testline for two-way gain/slope or step tone functions. Access: Telephone line or circuit connection to test equipment. Address: Information specifying a physical location of trunk termination in a switch, or the logical location of the trunk termination data in the switch computer.
  • Page 8 Database: All of the information stored in a computer available for retrieval and updating. dBm: A measurement of the power of a signal received above a reference power of 1 milliwatt (10 watts). dBrn: (dB reference noise): The reference for noise measurement, a level equivalent to a tone at –90 dBm.
  • Page 9 Ground Resistance: The resistance between the subscriber protector ground and C.O. ground. Line Loss (Circuit Loss): Measurement of power loss in dBm, measured with flat weighting over the voice frequency band. Loading, Cable: Adding inductance (load coils) at specific intervals along a cable to reduce distortion and improve frequency response, compensating for transmission-degrading distributed capacitance...
  • Page 10 Power Influence (PI): Noise measured between ground and the tip and ring conductors shorted together. Not heard by the subscriber, the power influence affects the amount of noise metallic the subscriber hears. The same as noise-to-ground (Ng), measured in dBrnC. REG: Range Extender with Gain (loop treatment) boosts C.O.

  • Page 11: Introduction

    SECTION 1 Test Set Operation INTRODUCTION This manual provides operating instructions for the Dynatel 900/900M Series test instruments. The first in the series, the 955 and 955M Combination Fault Locators performs dead-cable (vacant pair) diagnostic testing and resistance fault locating as well as opens and splits test functions and load-coil counting.
  • Page 12 Operation Section 1 The Digital World – Some Differences Between Analog and Digital Testing Each 900/900M Series test set contains a computer that tests the line and displays the results. Read the display carefully. The results may look different and have more information than what you’re used Analog meters have relatively low high-resistance limits;...
  • Page 13 Operation Section 1 Comparative Displays of Digital and Analog Readings of a Faulted Pair SHORT – (High Resistance): RING Leakage path 3 Megohms 900/900M Series Test Set Display (Digital Reading) OHMS AMPERES D.C. Volt/Ohm Meter Display (Analog Reading) Other analog meters have converted ohms into points.

  • Page 14: 0/900M Series Test Sets

    Operation Section 1 OHMS TO POINTS Ohms Points 100K 150K 230K 400K 900K 900/900M Series TEST SET This section of the operators manual contains operating instructions for 900/900M Series test set functions, including descriptions of each available test, hookup instructions, and step-by-step flowcharts of each test function.

  • Page 15: Auto Cal

    Operation Section 1 key, NOISE key, and in the step tone and 3M 1020B options under the AC LINE TEST key. To enter a telephone number, press the DIAL key, LOSS key, or NOISE key. Press the (star key) to advance to the SELECT/EDIT screen.

  • Page 16: Access

    The only exception may be if the error message is “OPEN TEST LEAD,” a condition that may be solved by replacing the test lead assembly. (See the phone number for 3M Technical Service in the front of this manual.) Access ACCESS has no user function.

  • Page 17: Other Setups

    Operation Section 1 To determine a cable’s capacitance, press the OPENS key. Press the (star) key to select NORMAL MODE, then wait. When the display changes, (pound) key to call up the OPENS menu. press the Move the cursor to CALIBRATE TO CABLE and press (star) key.

  • Page 18: Dial

    Operation Section 1 DIAL DIAL lets you connect to a working line, monitor it for conversation, then dial any number such as for battery kill, automatic number announcing (ANA), voice dispatch systems, loss or noise testing, or to listen to the called party.
  • Page 19 Operation Section 1 Example – Caller I.D. Option Hookup: RED to RING BLACK to TIP Disregard this step Turn unit on. if the unit is on. Reset You can press the * key Select to dial DIAL to go to number dialing. or caller I.D.

  • Page 20: Dc Line Test

    Operation Section 1 DC Line Test Hookup: RED to RING BLACK to TIP GREEN to GROUNDED SHIELD About DC Line Test Use the automatic DC Line Test routine to evaluate a vacant pair being placed into service or any pair with suspected problems.
  • Page 21 Operation Section 1 DC Line Test Hookup: RED to RING BLACK to TIP GREEN to GROUNDED SHIELD 88844 Note: On some floating-tip switches such as #5 ESS, ground resistance cannot be measured because the switch operates on a floating ground. DC LINE TEST VOLTAGE EXTENDERS...

  • Page 22: Voltage

    Operation Section 1 Voltage Hookup: RED to RING BLACK to TIP GREEN to GROUNDED SHIELD About the Voltage Test The VOLTAGE key detects and measures for central office battery or foreign DC and AC voltages on a pair, updating the measurement continually. Note: Voltage accuracy can be affected when source impedance exceeds the 900/900M Series Test Set input impedance of 1.11 Megohms.
  • Page 23 Operation Section 1 Voltage Hookup: RED to RING BLACK to TIP GREEN to GROUNDED SHIELD Disregard this step Turn unit on. if the unit is on. Reset Run test, show Voltage tip-ring VDC results Show ring–ground VDC results Show tip-ground VDC results You can continue to check Show tip-ground VAC...

  • Page 24: Current

    Operation Section 1 Current Hookup: RED to RING BLACK to TIP GREEN to GROUND About the Current Test The CURRENT key measures DC current on the subscriber loop to see if the telephone set has enough power for operation, continually updating the information. On the 945/945M and 965/965M, the CURRENT key function also tests ground resistance to check integrity of the ground connection at the station protector.
  • Page 25 Operation Section 1 Current Hookup: RED to RING BLACK to TIP GREEN to GROUND Disregard this step if the unit is on. Turn unit on. Reset On the 945/945M and Check current, 965/965M units only, you can Current show loop press the # (pound key) to current in mA.

  • Page 26: Ohms

    Operation Section 1 Ohms Hookup: RED to RING BLACK to TIP GREEN to GROUNDED SHIELD About the Ohms Test The OHMS key measures resistance between conductors, or from a conductor to ground. Measurements are displayed in ohms and points. Measurements can fluctuate with power influence, variations in fault resistance or C.O.
  • Page 27 Operation Section 1 Ohms Hookup: RED to RING BLACK to TIP GREEN to GROUNDED SHIELD Disregard this step Turn unit on. if the unit is on. Reset The letters “CO” on the Measure, show display indicate battery on tip-to-ring Ohms the line, while loop resistance resistances is being...

  • Page 28: Ohms To Distance (Ohms/Ft.)

    Operation Section 1 Ohms to Distance Hookup: none required About the Ohms to Distance Conversion When you encounter a SOLID SHORT (0 Ohms), you can find the equivalent distance in feet/meters by converting the ohms value with the OHMS TO DISTANCE key. By measuring the resistance with the OHMS key first, then pressing the OHMS TO DISTANCE key, the conversion is automatically calculated.
  • Page 29 Operation Section 1 Ohms to Distance Hookup: none required Disregard this step Turn unit on. if the unit is on. Reset The unit uses the temperature Select to dist, Ohms last used by resistance fault distance to , or locate unless you change it. Dist.

  • Page 30: Resistance Fault Locate

    Operation Section 1 Resistance Fault Locate Hook-up: As instructed on the unit’s display screen – varies by application (see page 23) About Resistance Fault Locate The RESISTANCE FAULT LOCATE (RFL) function measures the distance to the fault (DTF); distance from the strap to the fault (STF);...
  • Page 31 Operation Section 1 Resistance Fault Locate Hook-up: As instructed on the unit’s display screen – varies by application (see p. 23) Disregard this step if the unit is Turn unit Reset This is the last used setup (start Stored here if coming from RFL setups Fault setups Locate...
  • Page 32 *RTS = Resistance to Strap FAULT LOCATE FLOWCHART, p. 21 Note: Contact your 3M Technical Service Representative at the number shown in the front of this manual for a copy of Field Note #2 with detailed instructions on estimating cable temperature.
  • Page 33 Operation Section 1 RFL Examples These examples use the Cable Self Test Circuit, (below). Connect the leads RED to R, BLACK to B, GREEN to G, and YELLOW to Y. In the field, hookups vary with the application. Be sure to hook up the unit as the display screen instructs.
  • Page 34 Operation Section 1 RFL Example 1 – Unit Measures DTS Disregard this step if the unit is Turn unit on. Reset Stored setups –– Fault Change setups Locate Unit measures DTS Display distance in units of feet or meters For this example, press the Temperature options (star key) to use the temperature default (21 C or...
  • Page 35 Operation Section 1 RFL Example 2 – DTS Known (Compute Temperature) Disregard this step if the unit Turn unit on. is on. Reset Stored setups –– Always check the setups. Fault Change setups Press the (star key) to use Locate the stored setups if they are correct.
  • Page 36 Operation Section 1 RFL Example 2, continued continued from previous page... In the field, use the arrow Continue hookup as keys here to view the rest of instructed the instructions and continue making the hookup. Continue hookup as instructed The display may tell you Fault resistance, “wait”...
  • Page 37 Operation Section 1 RFL Example 3 Fault Locate – Multiple Gauge 1. Set up the unit for the locate: Unit measures DTS Test Temp. 70 F or 21 C Strap 3 sections Section 1 Section 2 Section 3 Turn unit on. Reset Press the (star key) to use...
  • Page 38 Operation Section 1 RFL Example 3, continued Fault Locate – Multiple Gauge 2. Set up for the first section: Test Strap 26 AWG or .4 mm 205 ft or 63 m continued from previous page... Pick section 1 gauge For this example, use Use arrow keys to line 26 AWG or .4 mm.
  • Page 39 Operation Section 1 RFL Example 3, continued Fault Locate – Multiple Gauge 3. Set up for the second section: Test Strap 26 AWG 24 AWG or .4 mm or .5 mm 205 ft or 63 m 1179 ft or 359 m continued from previous page...
  • Page 40 Operation Section 1 RFL Example 3, continued Fault Locate – Multiple Gauge 4. Set up for the third section: Test Strap 22 AWG 26 AWG 24 AWG or .7 mm or .4 mm or .5 mm 205 ft or 63 m 1179 ft or 359 m unknown continued from previous page...
  • Page 41 Operation Section 1 RFL Example 3, continued Fault Locate – Multiple Gauge 5. Hookup and measurement: DTS = 5046 ft or 1721 m Test DTF = 255 ft or 76 m Strap STF = 4791 ft or 1645 m continued from previous page... Continue test Select hookup: separate good pair...
  • Page 42 Operation Section 1 RFL Example 4 Splice Locate – Multiple Gauge 1. Set up the unit for the locate: DTS known 2500 ft/762 m Temp. 70 F or 21 C House 2 sections Protector Strap Test Set Turn unit on. Reset OR Stored setups ––...
  • Page 43 Operation Section 1 RFL Example 4, continued Splice Locate – Multiple Gauge 2. Set up for the first section: House Protector Strap Test Set “unknown” 24 AWG or .511 mm continued from previous page... Pick section 1 gauge Use arrow keys to line For this example, use with 24 AWG or 24 AWG or .511 mm.
  • Page 44 Operation Section 1 RFL Example 4, continued Splice Locate – Multiple Gauge 3. Set up the next section: House Protector Strap Test Set “unknown” “unknown” 26 AWG or .4 mm 24 AWG or .511 mm continued from previous page... Pick section 2 gauge (wire size) For this example, use Use arrow keys to line...
  • Page 45 Operation Section 1 RFL Example 4, continued Splice Locate – Multiple Gauge 4. Complete the setups: House Protector Strap Test Set “unknown” “unknown” 26 AWG or .4 mm 24 AWG or .511 mm continued from previous page... Use the default, 21 C or Cable temperature 70 F , for this example.
  • Page 46 Operation Section 1 RFL Example 4, continued Splice Locate – Multiple Gauge 5. Hookup and measurement: Results: Sec. 1 = 330 ft/114 m Sec. 2 = 2121 ft/648 m Test Set Strap 330 ft/114 m 2121 ft/648 m 24 AWG or .511 mm 26 AWG or .4 mm continued from previous page...
  • Page 47 Operation Section 1 Notes on RFL The set computes a measurement accuracy value based on the set accuracy, hookup, cable length and fault resistance magnitude. Depending on this value, the set may tell you to move closer and measure. Move the set and straps to a point on the cable near the fault and re-test.

  • Page 48: Tone

    Operation Section 1 Tone Hookup: For pair identification: RED to the CONDUCTOR TO BE IDENTIFIED BLACK to GROUND GREEN not used For louder tone (dead pairs only): RED to TIP and RING BLACK to GROUND GREEN not used Hookup: For loss or gain/slope measurements: RED to RING BLACK to TIP GREEN not used...
  • Page 49 Operation Section 1 Tone Hookup: For pair identification: RED to the CONDUCTOR TO BE IDENTIFIED BLACK to GROUND GREEN not used For louder tone (dead pairs only): RED to TIP and RING BLACK to GROUND GREEN not used Hookup: For loss or gain/slope measurements: RED to RING BLACK to TIP GREEN not used...

  • Page 50: Opens

    Operation Section 1 Opens Hookup: RED to RING BLACK to TIP GREEN to GROUNDED SHIELD About the Opens Test Use the OPENS key to detect and measure the distance to an open, partial open or “dirty” open. You can also measure pair length;...
  • Page 51 Operation Section 1 Opens Hookup: RED to RING BLACK to TIP GREEN to GROUNDED SHIELD Disregard this step Turn unit on. if the unit is on. Reset Normal, Special, Opens Split Locate, Load Coil Count Both Normal and Special modes operate the same. Move to select test For this example, select...
  • Page 52 Operation Section 1 For this example, connect the leads to the Cable Self Test Circuit (shown here) RED to R and BLACK to B only. Disregard this step if the unit Turn unit on. is on. Reset Normal, Special, Opens Split Locate, Load Coil Count Both Normal and Special...
  • Page 53 Operation Section 1 Limits of Opens Functions: Normal Mode and Special Mode Normal Special Partial Opens: >15K ohms 15K–1200 ohms Dirty Opens: >15K ohms 15K–1200 ohms Total Cable 3000 ft/914 m 100,000 ft Distance, if ( from CO) Loaded: 6000 ft/1829 m 30480 m (between loads) Total Cable...

  • Page 54: Splits

    Operation Section 1 Splits Hook-up: As instructed on the unit’s display screen – varies by application, see p. 46 About the Splits Test Use “LOCATE SPLIT” in the OPENS function to locate splits of two or more pairs open at both ends of the section.
  • Page 55 Operation Section 1 Splits Hook-up: As instructed on the unit’s display screen – varies by application, see p. 46 Disregard this step if the unit is on. Turn unit on. Reset Normal, Special, Opens Split Locate, Load Coil Count Use arrow keys to scroll display to line up with Split Locate selection.
  • Page 56 Operation Section 1 Example Splits Hookups Capacitive Balance Check Hookup 1: GREEN to PAIR 1 Pair 1 shorted to PAIR 3 BLACK to SPLIT 2 Pair 2 RED to GOOD 2 Pair 3 Hookup 2: RED to GOOD 1 Pair 1 BLACK to SPLIT 1 Pair 2 GREEN to PAIR 2...
  • Page 57 Operation Section 1 Split Locate Hookup Hookup: RED to GOOD 1 Pair 1 BLACK to SPLIT 1 GREEN to SPLIT 2 Pair 2 YELLOW to GOOD 2 shorted to PAIR 3 Pair 3 Page 47...

  • Page 58: Ac Line Test

    Use AC LINE TEST to automatically evaluate a working pair. You can measure slope with a step-tone generator or a 3M brand 1020B test line or other equipment that performs two-way loss measurement (not available in the 945/945M). Use the appropriate blue keys to verify results before taking corrective action.
  • Page 59 LOSS LOSS SLOPE GROUND NOISE NOISE DIAGNOSIS DIAGNOSIS PWR INFLUENCE COMMAND* TEST BALANCE TEST DIAGNOSIS Available in 900-T-Series test sets only: STORE RESULTS? EDIT TITLE GO TO STEP TONE OR END *See 3M 1020B Operators Manual for instructions. Page 49...

  • Page 60: Ringers

    Operation Section 1 Ringers Hookup: RED to RING BLACK to TIP GREEN to GROUND About the Ringers Test Use the RINGERS key to count the ringer equivalences and display bell circuit wiring configuration at the subscriber premises, based on a type 5200 telephone having a 1.0 ringer equivalence, and to check for the presence of a maintenance test unit (MTU) at the subscriber premises.
  • Page 61 Operation Section 1 Ringers Hookup: RED to RING BLACK to TIP GREEN to GROUND Disregard this step if the unit is on. Turn unit on. Reset Ringers, MTU Ringer Test You can select MTU Test to Use arrow keys to check for the presence of a move cursor to line up maintenance test unit at...

  • Page 62: Reg

    Operation Section 1 Hookup: RED to RING BLACK to TIP GREEN to GROUND About the REG Test Use the REG key to detect loop extenders, Range Extenders With Gain (REGs) or Dial Long Line (DLL) adapters in long subscriber loops. The unit displays two-way loop resistance;...
  • Page 63 Operation Section 1 Hookup: RED to RING BLACK to TIP GREEN to GROUND Disregard this step if the unit is on. Turn unit on. Reset Listen for dial tone Loop extender status The C.O. Switch type Loop resistance and identifies the CO resistance tip-to-ground on-hook resistance;...

  • Page 64: Loss

    Operation Section 1 Loss Hookup: RED to RING BLACK to TIP GREEN to GROUND About the Loss Test Use the LOSS key to measure attenuation in subscriber loops. The unit calls up a milliwatt or step-tone generator and measures and displays test tone frequency and loss. Note: If the milliwatt number dials to a combination line (10 seconds of milliwatt tone followed by quiet line), you can press the NOISE key after the loss measurement to perform a noise...
  • Page 65 Operation Section 1 Loss Hookup: RED to RING BLACK to TIP GREEN to GROUND Disregard this step if the Turn unit on. unit is on. Reset You can press the # Select to dial (pound key) to bypass the Loss or measure.

  • Page 66: Noise

    Operation Section 1 Noise Hookup: RED to RING BLACK to TIP GREEN to GROUNDED SHIELD About the Noise Test Use the NOISE key to dial to a quiet line and measure unwanted signal in subscriber loops. The unit displays noise metallic, power influence (noise to ground), and calculated balance.
  • Page 67 Operation Section 1 Noise Hookup: RED to RING BLACK to TIP GREEN to GROUNDED SHIELD Disregard this step if the Turn unit on. Reset unit is on. Select to You can press the # measure noise (pound key) to measure Noise or longitudinal longitudinal balance.
  • Page 68 Operation Section 1 Noise Routine – Measure Longitudinal Balance Hookup: RED to RING BLACK to TIP GREEN to GROUNDED SHIELD Disregard this step if the Turn unit on. unit is on. Reset You can press the # Select to measure (pound key) to measure noise or longitudinal Noise...

  • Page 69: Section Two - Special Applications 1. Multiple Resistance Faults

    SECTION 2 Special Applications 1.1 For resistance faults at more than one location on a pair, the resistance fault locate operation gives a distance to the average of the fault locations. For example, if a 3000 ft/914 m cable has one 10k ohm fault at 1000 ft/304 m and a 100k ohm fault at 2000 ft/610 m, the unit should show a 9.09k ohms fault at about 1091 ft/333 m (the average), or just past the major fault.

  • Page 70: Water In Cable - Resistance Faulted Pair

    Special Applications Section 2 2.1 Where water in the cable causes a resistance fault, the unit measures to the middle of the wet section, or the average of the total resistance faults. Use the following procedure to estimate the length of cable damaged by water: Measure the length of the cable (DTS) with the RFL function.

  • Page 71: Section Analysis

    Special Applications Section 2 3.1 To analyze a section of cable, first use the RESISTANCE FAULT LOCATE function to measure as many resistance faults as you can in the section. Next, use the OPENS key to measure to as many open faults in the section as possible, then refer to the chart below: Pattern of Symptoms...

  • Page 72: Load Coils

    Special Applications Section 2 4.1 The electrical length of load coils makes a pair with load coils measure longer than the actual cable length. For example, load coil leads are usually 24 gauge (AWG). If the conductor under test is 19 gauge, a five-foot or 1.5 meter stub adds more than 32 feet or 9 meters to your measurement, plus the electrical length of the coil itself.
  • Page 73 Special Applications Section 2 Counting Load Coils Hookup: RED to RING BLACK to TIP Disregard this step Turn unit on. if the unit is on. Reset Normal, Special, Split Locate, Load Opens Coil Count Move to select test type– Load Coil Count The load coil count takes 1.5 Results of load coil minutes to complete.

  • Page 74: Locating Opens By Ratio

    Special Applications Section 2 Step 1 – Setup: Disconnect the open conductor at both ends Determine the length of the section under test and record as measurement “D.” Step 2 – Hookup: Red – open conductor Black and green – shield or other conductor Step 3 –...

  • Page 75: Locating Open Shield

    Special Applications Section 2 Step 1 – Setup: Disconnect shield bond to isolate the shield at both ends. Determine the length of the section under test and record as measurement “D.” Step 2 – Hookup: Red – shield Black and green – ground rod; or when induction is interfering, connect to several bunched vacant pairs.

  • Page 76: Temperature Conversion

    Special Applications Section 2 7.1 With a resistance measurement, you can get the equivalent length in feet for a different temperature, using the following procedure. 1. Press to turn unit on. 2. Press 3. Select using keys. Press SET TEMPERATURE 4.

  • Page 77: Section Three - Specifications 2. 955/955M Combination Fault Locator 67 A. Measurements

    SECTION 3 Specifications A. Measurements Function Range Resolution Accuracy AC Voltage: 0 to 75 VAC 0.1V 0.7V 75 to 250 VAC 1.0V DC Voltage: 0 to 100 VDC 0.1V 0.5V 100 to 350 VDC 1.0V DC Current: 0 to 100 mA DC 0.1 mA 0.3 mA (Zin = 430 ohms) Resistance...
  • Page 78 Specifications Section 3 10k ft to 100k ft 10.0 ft 1 to 99 m 0.1 m 100 to 999 m 1.0 m 1000 to 30000 m10.0 m Temperature Sensor: 0 to 140 F +2 F –18 to 60 C .5 C +1 C Noise Immunity: 7 VAC limit for all frequencies...

  • Page 79: Outputs

    Specifications Section 3 C. Outputs Tones Frequency Level Impedance Identification: 577.5 Hz 6V PK to PK 100 ohms (Current limited to 6 mA) Precision Tones: 1004 +1 Hz 0 dBm + 0.2 dB 600 Ohm Harmonic distortion: <45 dB (up to 10th harmonic) D.

  • Page 80: 5/945M Subscriber Loop Tester

    Specifications Section 3 A. Measurements Function Range Resolution Accuracy AC Voltage: 0 to 75 VAC 0.1V 0.7V 75 to 250 VAC 1.0V DC Voltage: 0 to 100 VDC 0.1V 0.5V 100 to 350 VDC 1.0V DC Current: 0 to 110 mA DC 0.1 mA 0.3 mA (Zin = 430 ohms)

  • Page 81: Outputs

    Specifications Section 3 B. Outputs Tones Frequency Level Impedance Identification: 577.5 Hz 6V PK to PK 100 ohms (Current limited to 6 mA) Precision Tones: 1004 +1 Hz 0 dBm + 0.2 dB 600 Ohm Harmonic distortion: <45 dB (up to 10th harmonic) Dial Frequency Remarks...

  • Page 82: 5/965M Subscriber Loop Analyzer

    Specifications Section 3 A. Measurements Function Range Resolution Accuracy AC Voltage: 0 to 75 VAC 0.1V 0.7V 75 to 250 VAC 1.0V DC Voltage: 0 to 100 VDC 0.1V 0.5V 100 to 350 VDC 1.0V DC Current: 0 to 100 mA DC 0.1 mA 0.3 mA (Zin = 430 ohms)

  • Page 83: Resistance Fault Locate

    Specifications Section 3 Measurements continued... Function Range Resolution Accuracy Ground Resistance: 0 to 500 ohms 1 Ohm 3 ohms Loop and C.O. Resistance: 0 to 5000 ohms 1 Ohm +10% + 50 ohms (read through the REG key assuming on-hook resistance is known) Caller I.D.
  • Page 84 Specifications Section 3 Note: See figures next page for accuracies. All resistance to fault measurement accuracies have an added factor of (2 x 10 ) RF ohms. Single pair hookup measurement accuracy is strictly dependent on whether the reference pair is exactly the same electrical length as the faulted pair.

  • Page 85: Outputs

    Specifications Section 3 C. Outputs Tones Frequency Level Impedance Identification: 577.5 Hz 6V PK to PK 100 ohms (Current limited to 6 mA) Precision Tones: 404, 1004, 0 dBm + 0.2 dB 600 Ohm 2804 +1 Hz Harmonic distortion: <45 dB (up to 10th harmonic) User-Entered Tone: Frequency Resolution...

  • Page 86: Test Lead And Battery Installation Instructions

    SECTION 4 Care & Maintenance TEST LEAD AND BATTERY INSTALLATION INSTRUCTIONS Step 1 Insert the test lead plug into the top four holes. 900 /900M Series Test 900-T-Series Test Set Page 77 Page 77...
  • Page 87 Care & Maintenance Section 4 Step 2 Press down firmly. Test leads are now installed. 900 /900M Series Test 900-T-Series Test Set Step 3 Invert case and remove the battery cover by loosening the six screws with a flat-blade screwdriver. Step 4 Install batteries, matching the...

  • Page 88: Battery Maintenance

    Care & Maintenance Section 4 Step 5 Replace the battery cover. Turn the unit on. The message “PLEASE IDENTIFY BATTERIES USED” appears. Press the (pound key) or (star key) to identify battery type, then press the AUTO CAL key and run self calibration. Note: When installing new rechargeable batteries, or to compensate for weak rechargeable batteries, use the internal battery charger to overcharge the cells...
  • Page 89 Care & Maintenance Section 4 Battery Types and Capacity Table NICKEL- ALKALINE CADMIUM* QUANTITY SIZE “C” CELLS “C” CELLS NEDA NUMBER ORDER NUMBER 26-0000-4787-3 26-1006-2163-5 “BATT OK” >6 VOLTS >6 VOLTS “BATT LOW” 5.9 – 5.75 VOLTS 5.9 – 5.75 VOLTS SOFTWARE SHUTDOWN <5.75 VOLTS <5.75 VOLTS...

  • Page 90: When To Charge Or Replace Batteries

    Care & Maintenance Section 4 When To Charge Or Replace Batteries The unit displays an estimate of battery charge: voltage for alkaline batteries and percent of power used for rechargeable batteries. The unit also displays “CHARGE BATTERIES” to prompt you to recharge the batteries (if rechargeable), or replace them with either alkaline dry cells or a spare set of rechargeable batteries.
  • Page 91 Care & Maintenance Section 4 CHECK OPENS PERFORMANCE To check OPENS performance, use the Cable Self Test Circuit included with your set, shown above. Attach the red lead to terminal “R” and the black lead to terminal “B.” Press the OPENS key. The results in feet or meters should be in the ranges shown in the table below.

  • Page 92: Check Opens Performance

    Care & Maintenance Section 4 CHECK RESISTANCE FAULT LOCATE PERFORMANCE The Cable Self Test Circuit (above) allows you to test the resistance fault locate function at any time. This test is particularly important when potentially damaging physical conditions such as shock or prolonged submersion could affect performance.
  • Page 93 Care & Maintenance Section 4 Check RFL Performance Flowchart Hookup (to Cable Self Test Circuit): Turn unit on. Reset Stored setups –– Fault Change setups Locate Press the (star key) to choose Measure DTS, or DTS known Measure DTS Display distance in units of feet or meters Press the (star key) to use the...
  • Page 94 Care & Maintenance Section 4 CHECK RFL FUNCTION, continued DTS results: DTS=12100 ft/3680 m “PLEASE WAIT” while unit continues RFL measurement You can press # to repeat the DTF=1210 ft/369 m test with the most commonly STF=10890 ft/3312 m used cable gauges. DTS=12100 ft/3680 m Accuracy results Test...
  • Page 95 Care & Maintenance Section 4 Metric RFL Self Test 21.1 C wire min max min max size .912 3630 m 3746 m 356 m 375 m 3274 m 3371 m Page 86...

  • Page 96: Appendix

    APPENDIX Appendix Generally Accepted Criteria for Plain Old Telephone Service Parameter Acceptable Marginal Unacceptable 1, 2 Loop Current mA 20< 23 <20 Circuit loss dBm – >8.5 Metallic Noise dBrnC >20< 30 Power Influence dBrnC >80<90 Balance dB >50<63 *Station Ground Ohms –––...
  • Page 97 Appendix Notes on AC line Analysis Procedures Loop current and circuit loss work together. When loop current approaches –23 mA the circuit loss should be approximately –8.0 dBm. If the loop current is low and the circuit loss is less than –8.0 dBm, the problem is probably a defective loop aid.
  • Page 98 Appendix influence will be higher than at the time the service call is made. If noise was the subscriber’s complaint, then balance is the cause of problem; if the complaint was not related to noise, the low balance may not be a problem. Noise caused by balance is a common cause of multiple service calls.
  • Page 99 Telecom Systems Division 6801 River Place Blvd. This literature was printed in the U Austin, Texas 78726–9000 3M 1...

This manual is also suitable for:

Dynatel 900m seriesDynatel 900-t seriesDynatel 955Dynatel 955mDynatel 945Dynatel 945m ... Show all

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