3M 965DSP-B User Manual

TM

Dynatel

965DSP-B

Subscriber Loop Analyzer

Instruction Manual

October, 1997

78-8097-6012-3 Rev A

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Welcome to the Instruction Manual for the
965DSP-B. ‘DSP’ means ‘Digital Signal
Processor.’ Digital Signal Processing allows the
965DSP-B instrument to provide the fast and
flexible test functions needed for diagnostic
testing. ‘B’ means ‘Basic’. The ‘B’ version does
not have the TDR function found in the 965DSP.

This document will give you a brief overview of
the product, a description of the test functions,
and some technical hints on how to find common
problems on telecommunications cables.

This document is not meant to be a substitute for
diagnostic test training. For further information
on complete training, contact 3M Telecom
Systems Technical Service at: 800 426 8688.

Table of Contents:

Out of the Box 4
Screen 5
Keypad 5

Control keys 6
Editing 6
Function keys 7

Functions:

Contrast 9
High Voltage 9
Voltage 10
Current 11
Resistance 12
Toolbox 13

Self Calibrate 14
Load Coils 15
Ohms/Distance 16

Caller ID 17
Opens 18
Tone 21
RFL 23
ISDN 29
dB 31
Auto 34

Talk Set 37
Care and Maintenance 39
Specification 42
Warranty Information 43

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Out of Box

Here’s what you will find when you unpack the
shipping box:

965DSP-B
Carrying Case
NMH Battery Pack

(inside the 965DSP-B)
Spare Battery Holder
Test Leads

- Red/Black Pair

- Blue/Yellow Pair

- Green Lead
Shorting Strap
AC/DC Adaptor
Power Cord
Instruction Manual
Quick Card
Warranty Card

The 965DSP-B comes in the carrying case and
should remain in the case to give extra
protection from shock and the environment.

The 965DSP-B comes with the battery pack
already installed. You may need to charge the
battery before using the unit. Please see page 39
for information on charging the battery pack.

The Spare Battery Holder holds six “AA”
alkaline batteries, and should only be used if the
battery pack is discharged and the AC/DC
converter is not available.

The 965DSP-B comes with 5 test leads. Red,
Black and Green are used for most functions.
Yellow is used for RFL. The Shorting Strap is
only used in RFL.

The AC/DC adaptor will convert 110 or 220 Vac
into the 12 Vdc used for charging the 965DSP­B.

A North American 110 Vac Power Cord is

provided.
Additional information is also found in the

965DSP-B help screens. For Technical Service,
Warranty or Repair questions call: 800 426
8688 or contact your Local 3M Representative.

© Minnesota Mining and Manufacturing

3M Telecom Systems Division

6801 River Place Blvd.

Austin, Texas 78726-9000 USA

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Screen

The 965DSP-B screen is a graphical LCD
(Liquid Crystal Display) that gives high
resolution for viewing text and graphics. The
screen format is similar to the following for
most functions.

Test Leads

Test Lead icons are shown on each
measurement screen. They always point to the
color dots on the front label that corresponds to
the real test leads.

Keypad

The 965DSP-B Keypad has twelve yellow and
red “Control Keys” and twelve blue “Function
Keys”.

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Control Keys

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 off.

The [Save] key is reserved for future
software enhancements, and is a ‘dash’
or ‘minus’ sign when editing numbers.

Use the [On/Off] key to turn the 965DSP
on or off.

Use the [Tab] key to select between
different options.

Use the [Setup] key to change the setup
of any function.

Use the [Help] key to get help with any
screen.

Use the [Enter] key to accept changes or
move to the next step in a function.

Use the [Up] and [Down] keys to
scroll to different menu options.

Use the [Left] and [Right] keys to
move between different options.

Editing

Use the following keys when editing numbers:
Use to insert a space to the left of the cursor.

Use to delete the number above the cursor.

Use to add a ‘dash’ in a telephone number or
a minus sign for levels or temperature.

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Function Keys

Use the blue keys to select the different test
functions in the 965DSP-B. The blue keys
become number keys when editing.

Use the [Voltage] key 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 [Toolbox] key to access: Load
Coil Count, Self-Calibration, Ohms to
Distance, or Caller ID.

Use the [Opens] key to find the distance
to an ‘open’ (or break) in a pair or cable.

Use the [Tone] key to send tones for pair
identification or measuring loss.

Use the [RFL] key to find the distance to
a resistance fault on a pair.

Use the [ISDN] key to verify the presence of
an ISDN signal, and to measure near-end and
far-end errors on an acti ve ISDN line.

The [TDR] key is not used in the 965DSP-B.
Contact 3M Customer Sevice at 800 426
8688 concerning TDR upgrades.

Use the [dB] key to measure Loss, Noise,
Longitudinal Balance, or Wideband Loss.

Use the [Auto] key to perform a series of
tests on an Active or Inactive pair.

Use the [Talk Set] key to dial numbers or to
place a phone call on a working pair .

All functions (except for Tone and TDR) ‘time
out’ in five minutes if no key has been pressed.
Tone and TDR time out after 30 minutes.

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Welcome Screen

This is the screen you see when you first turn on
the 965DSP-B. It shows the model name, serial
number, copyright date, software version, and
the version country.

When the Welcome screen shows, press [Setup]
to go to the Setup screen.

Setup

Press [Enter] to change the Units of
Measurements (Distance and Temperature).

Press [Back] to return to the Welcome screen.

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Units

Use the [Up] and [Down] keys to highlight
either Distance or Degrees. Use the [Tab] key to
select the units of measurement.

Use [Enter] to accept the changes and return.
Use [Back] to return without making changes.

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 off.

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Voltage

This function first measures and displays the DC
voltage between the Red and Black test leads.

Press the [Tab] key to move to the next test lead
configuration.

Press the [Enter] key to switch between DC and
AC voltage.

Press the [Tab] key to move to the next test lead
configuration.

Press the [Enter] key to switch between AC and
DC voltage.

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Current

This function measures the current flowing into
the Red and Black test leads (and a 430 Ohm
resistor inside the 965DSP-B). Connect the Red
and Black leads to the pair to measure loop
current. Connect the Red lead to the voltage side
of the pair and the Black lead to ground to
measure ground current.

If the Current is greater than 110 mA , you will
see the following ‘Current Warning’ screen:

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.

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Resistance

This function first measures the resistance
between the Red and Black test leads.

Press the [Tab] key to move to the next 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
compensation. Use this test only if you have
first determined there is no DC voltage on the
pair (by using the Voltage function). The non­compensated measurement is slightly faster, but
is not as accurate if there is voltage on the line.

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Toolbox

Use the [Up] and [Down] arrow key to move to
the desired ‘tool’, then press the [Enter] key to
accept the choice.

The Toolbox 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 (Maintenance) is
only used during 965DSP-B factory service.

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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.

You will see the following screen as soon as you
select Self-Calibration from the Toolbox. Test
lead connections (open or shorted) are not
important during this phase of the calibration.

Short all five leads when prompted, then press
[Enter] to continue.

The screen shows “Self-Calibration Complete”
when the calibration is done.

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