3M 965DSP-B manuale d’uso

1 Instruction Manual October , 1997 78-8097-6012-3 Re v A Dynatel 965DSP-B Subscriber Loop Analyzer TM[...]

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3 W elcome to the Instruction Manual for the 965DSP-B. ‘DSP’ means ‘Digital Signal Processor . ’ Digital Signal Processing allo ws the 965DSP-B instrument to provide the fast and flexible test functions needed for diagnostic testing. ‘B’ means ‘Basic’. The ‘B’ v ersion does not hav e the TDR function found in the 965DSP . This d[...]

4 Out of Box Here’ s what you will f ind when you unpack the shipping box: 965DSP-B Carrying Case NMH Battery Pack (inside the 965DSP-B) Spare Battery Holder T est Leads - Red/Black Pair - Blue/Y ellow P air - Green Lead Shorting Strap A C/DC Adaptor Power Cord Instruction Manual Quick Card W arranty Card The 965DSP-B comes in the carrying case a[...]

5 Screen The 965DSP-B screen is a graphical LCD (Liquid Crystal Display) that gives high resolution for vie wing text and graphics. The screen format is similar to the following for most functions. Keypad The 965DSP-B Keypad has twelve yellow and red “Control Keys” and twelve blue “Function Keys”. T est Leads T est Lead icons are shown on e[...]

6 Control K eys Use the red and yellow keys to control the actions and the setup of the 965DSP-B and its functions. The active control keys for each function are shown at the bottom of the corresponding screen. Use the [Back] key to return to a previous step in a function. Use the [Contrast] key to adjust the contrast or to turn the backlight on or[...]

7 Function Keys Use the blue ke ys to select the different test functions in the 965DSP-B. The blue keys become number keys when editing. Use the [V oltage] k ey to measure DC or AC voltage. Use the [Current] key to measure loop or ground Current. Use the [Resistance] key to measure resistance. Use the [T oolbox] ke y to access: Load Coil Count, Se[...]

8 W elcome Screen This is the screen you see when you first turn on the 965DSP-B. It shows the model name, serial number , copyright date, softw are version, and the version country . When the W elcome screen shows, pr ess [Setup] to go to the Setup screen. Press [Enter] to change the Units of Measurements (Distance and T emperature). Press [Back] [...]

9 Contrast Press the [Contrast] key to display the contrast screen. Use the [Up] and [Down] arrow keys to adjust the contrast. Press the [Contrast] key again to turn the backlight on or of f. Use the [Up] and [Down] keys to highlight either Distance or Degrees. Use the [T ab] k ey to select the units of measurement. Use [Enter] to accept the change[...]

10 Press the [T ab] key to mo ve to the ne xt test lead configuration. Press the [Enter] key to switch between DC and AC voltage. V oltage This function first measures and displays the DC voltage between the Red and Black test leads. Press the [T ab] key to mo ve to the ne xt test lead configuration. Press the [Enter] ke y to switch betw een A C an[...]

11 This screen indicates that a high current has been detected between the test leads and that the 965DSP-B has opened an internal relay to protect itself from damage. Use standard safety practices for disconnecting the test leads. Press the [Enter] key to start the Current test again. Curr ent This function measures the current flowing into the Re[...]

12 Resistance This function first measures the resistance between the Red and Black test leads. Press the [T ab] key to mo ve to the ne xt test lead configuration. The “V” in the upper right corner of the screen indicates that the resistance measurement compensates for C.O. voltage on the line. Press the [Enter] key to remove the voltage compen[...]

13 T oolbox Use the [Up] and [Down] arrow key to move to the desired ‘tool’, then press the [Enter] key to accept the choice. The T oolbox contains four additional functions: • Self-Calibrate • Load Coils • Ohms to Distance • Caller ID Descriptions of these functions are found in the following pages. The fifth item in the menu (Maintena[...]

14 Self-Calibration Use this function to calibrate the 965DSP-B anytime the outside temperature changes by more than 35 ° F (20 ° C). Calibrate the 965DSP-B at the same temperature at which it will be used. Y ou will see the following screen as soon as you select Self-Calibration from the T oolbox. T est lead connections (open or shorted) are not[...]

15 Load Coils This function takes about one minute to count up to four load coils on the pair . Y ou will see the word ‘Counting’ in the display while the test is in progress. Y ou will see the word ’Done’ when then test is complete. Press the [Enter] key at any time if you wish to stop the count earlier . The screen then shows the number o[...]

16 Ohms/Distance Use this function to convert between Ohms and Distance based on the temperature and wire gauge entered. Enter the v alue of Ohms, then press the [T ab] key to select wire gauges or temperature. If you select wire gauges, press the [Up] and [Down] keys to select the desired gauge. If you choose temperature, enter the value of the de[...]

17 Caller ID This function detects the Caller ID signal sent on the pair and displays the calling number , the name of the calling party , the signal level, and the message status. Certain result boxes may be blank if the information is not available from the Caller ID signal. Use the [Up] and [Down] arrows to adjust the speaker v olume. Press the [...]

18 Opens This function shows the distance to an ‘open’ (or ‘break’) based on the cable type chosen. T he Opens function is most accurate if other pairs in the cable are active. If other pairs are not active, you must short at least 30% of the other pairs to the cable shield. Press the [Up] or [Down] keys to move to a desired cable type. Pre[...]

19 Edit Custom Use this function to change the value of the “Custom Cable” type. Y ou should use Custom Cable if you are using a specific type of special cable on a regular basis. Press [Enter] to accept the changes and return to the Opens Setup screen. Press [Back] to return without making changes. First enter the red to black capacitance/dist[...]

20 Calibrate to Cable Use this function to measure the capacitance of a known good pair within a cable of known length. T his v alue can be used as a ‘Calibrated Cable’ (or ‘reference’) to find the distance to an ‘open’ on the same or similar cable. Connect the Red and Black leads to the pair (to be used as a reference) and Green to shi[...]

21 T one Use this function to send a tone on a pair . Press the [Up] and [Down] keys to adjust the volume of the tone heard in the 965DSP-B speaker . Note that the volume control does not af fect the level of the tone sent on the pair . Use the [Up] and [Down] keys to select the desired tone. Note that the top tone on the list is always sent as an [...]

22 Press the [Setup] key to edit the selected tone. Press the [T ab] ke y to select either Frequency or the Level for editing. Press the [Enter] key to accept the changes and return to the T one Menu scr een. Press the [Back] key to return without making changes. Y ou may only change the frequency of the ID T one. The le vel is f ixed at its maximu[...]

23 RFL (Resistance Fault Locate) Use this function to locate a Resistance Fault on a pair or on a single conductor . The function first shows two possible hookups: Separate Pair or Single P air . Use the [T ab] ke y to switch between the two hookups. Separate Pair: (This is the preferred hookup ) Y ou must first use the Resistance function to ident[...]

24 There are three possible hookup errors: 1) the fault is greater than 20 M Ω , 2) the Red/Green strap is bad, 3) the Red/Y ello w strap is bad. The screen will show the combination of errors that has been detected. Correct the errors and press the [Enter] key to repeat the hookup test. If no errors in the hook-up are detected, the 965DSP-B will[...]

25 RFL Single Pair Use the RFL Single Pair hookup when only one wire in a pair is faulted and a reference pair is not available. Use the Separate Pair hookup for all other cases; it is the preferred method. Y ou must first use the Resistance function to identify a faulted conductor in a pair and to verify that the other conductor is not faulted. On[...]

26 Press [T ab] to sho w readings in Ohms instead of distance. Press [Enter] to repeat the fault locate using the same Distance to Strap. Press [Setup] to go to the RFL setup screen. The number in the lower right corner is the section number of the fault when Multiple Gauge is selected. The screen shows “1” for Single Section (Single or Separat[...]

27 RFL Setup Use the RFL Setup to change the Gauge and/or the T emperature of a single section of cable. Press the [T ab] ke y to select either the W ir e Gauge menu or the T emperature for editing. If you select the W ire Gauge menu, press the [Up] and [Down] keys to select the desired gauge. If you choose T emperature, enter the v alue of the des[...]

28 The Multi-Section screen shows a summary of the lengths for up to six sections. The screen also shows the common temperature for all six sections. Press the [T ab] ke y to select either the Section Information or the T emperature for editing. I f you choose T emperature, enter the v alue of the desired temperature using the Blue keys as a numeri[...]

29 ISDN Use this function to detect a 2B1Q ISDN signal on a pair , and to measure near -end and far-end errors on an active ISDN line. 2B1Q ISDN is sometimes called NI (National Implementation) ISDN. Note: the 965DSP-B will not detect older ISDN formats (such as A TT AMI, NTI AMI, etc .). Connect the Red and Black leads to the pair and press the [E[...]

30 The 965DSP-B will count and display the number of Near -End and Far -End errors. “Near-end” er rors are the errors detected at the 965DSP-B. “Far -End” er rors are errors detected at an ISDN line card. (The far -end count is transmitted to the 965DSP-B over the ISDN link.) The screen displays the elapsed time since the start of the ISDN [...]

31 dB Use this function to measure Loss, Noise, Longitudinal Balance, or W ideband Loss. See “T alk Set” on page 38 for more information on dialing numbers. The “Dial Noise” and “Dial Longitudinal Balance” screens appear the same as above, except for the screen titles. Separate lists of phone number are kept for each function. Press the[...]

32 Loss Use this function to measure loss from the far end to the near end using a tone between 200 Hertz and 20k Hz. Y ou must use a separate instrument to generate the tone at the far end. Press the [T ab] ke y to go to Longitudinal Balance. Press the [Left Arrow] ke y to go to Loss. See Loss above for other control keys. Noise Use this function [...]

33 Longitudinal Balance Use this function to measure the active Longitudinal Balance on the pair . The 965DSP automatically goes off-hook to measur e Longitudinal Balance. The screen displays the signal level in dBm, and the frequency of the tone in kilohertz. Press [Enter] to return to the dB menu. W ideband Loss Use this function to measure the l[...]

34 Auto Use this function to perform an automatic sequence of tests on an inacti ve or acti ve pair . The results appear as each test is completed. If a test cannot be done, “***” appears in the appropriate result box. Inactive Pair Inactive tests are performed on non-working lines and include: DC V olts, Resistance, Opens, Load Coils, and Capa[...]

35 Active Pair Active tests are performed on working lines and include: DC V olts, Current, Loss, Noise and Longitudinal Balance. The results appear as each test is completed. If a test cannot be done, “***” appears in the appropriate result box. The Acti ve P air test uses the phone numbers stored in memory when dialling a test line for Loss, [...]

36 Auto Setup (continued) There are three choices in the Auto Setup menu: • Dial Loss • Dial Noise/Longitudinal Balance • Opens Cable T ype Press the [Up] or [Down] keys to move to a desired selection. Press the [Enter] key to accept the choice. Use the [Back] key to return to the Auto Menu. Dial Loss: Use this setup to enter a ‘milliwatt?[...]

37 T alk Set This function allows you to use the 965DSP-B as a T alk Set on acti ve pairs, or to send DTMF tones or pulses on inactive pairs. Connect the Red and Black leads to the pair for Loop Start. Also connect the Green lead to ground for Ground Start. This screen displays the last number dialed, the DC voltage on the line, and the signal form[...]

38 T alk Set Setup Press the [Setup] key to access the telephone number directory . Use the blue keys to c hang e the number . See the Editing instructions on page 6 for additional information. Press the [Enter] key to accept the changes and return to the previous screen. Use the [Back] key to return to the previous screen without making changes. U[...]

39 Care and Maintenance Battery P ack : The 965DSP-B uses a Nick el Metal Hydride (NMH) battery pack. T ypical life of the battery pack is two years. T o change the battery pack: 1) loosen the six screws on the battery compartment door and remov e the door , 2) remove the old pack , then 3) unplug the battery connector . T o install a ne w battery [...]

40 Battery Holder : The plastic battery holder that comes with the 965DSP-B uses six “AA” alkaline batteries (alkaline batteries are not included). Use alkaline batteries only when the NMH battery pack is discharged and the A C/DC adaptor is not a vailable. T ypical lifetime of the alkaline battery pack is eight hours of normal use (less if you[...]

41 If the above solutions do not fix the problem, the 965DSP-B may need repair . Please make a note of the conditions when any failure occurred and record any error messages that may have appeared on the screen, then call 3M T elecom Repair Service at 800 426 8688 for further details on repair service. Symptom Cause Solution Unit does not turn on D[...]

42 Function Range Accuracy V oltage: 0 to 30 Vdc, V ac 0.5 V 30 to 300 Vdc 0.7 V 30 to 250 V ac 0.7 V Current: -60 to 60 mA 1% +/- 0.3 mA -110 to -60 mA 2% 60 to 110 mA 2% Resistance: 0 to 100k Ω 1% +/- 5 Ω (1% +/- 50 Ω if C.O. voltage present) 100k Ω to 10M Ω 3% 100M Ω to 1000M Ω 10% Load Coils: 0 to 4 Opens: 3 to 10000 ft 1% +/- 3 f[...]

43 New Pr oduct Limited W arranty: 3M T elecom Systems (herein referred to as the Seller) warrants its products to be free from defects in material and workmanship, subject to the following terms and provisions: a) All instruments are warranted for 12 months after date of shipment from the Seller to the original purchaser . b) Seller’ s obligatio[...]

44 © 1997 T elecom Systems Di vision 6801 River Place Blvd. Austin, T exas 78726-9000 USA[...]