MAN Digiphone Eng 02

Instruction Manual

Kommunikationsnetze Communication Networks

Elektrizitätsnetze Power Networks

Rohrleitungsnetze Water Networks

Leitungsortung Line Location

- Date of release: 2003/25 -Subject No.: 9004181

Mess- und Ortungstechnik Measuring and Locating Techniques

Digiphone

MAN_digiphone_eng_02.doc 2


FOREWORD

ADVICE FROM HAGENUK KMT GMBH

This user manual has been conceived as a description and reference work. It is intended to help you to answer questions and solve problems as quickly as possible. Should you have problems, please first read the user manual with care.

To do this, make use of the index and read the relevant section carefully. Also check all the relevant connections.

If your questions still remain unanswered, please contact the following addresses:

Hagenuk KMT Seba Dynatronic Kabelmeßtechnik GmbH Meß- und Ortungstechnik GmbH Roederaue 41 Dr.- Herbert- Iann- Str.6

D - 01471 Radeburg / Dresden D - 96148 Baunach

TELEFON: +49 / 35208 / 84 - 0 TELEFON: +49 / 9544 / 68 - 0 TELEFAX: +49 / 35208 / 84 249 TELEFAX: +49 / 9544 / 22 73

SERVICE-HOTLINE :

TELEFON:+49 / 35208 / 84 211 TELEFON:+49 / 9544 / 68 - 0 TELEFAX : +49 / 35208 / 84 250 TELEFAX: +49 / 9544 / 22 73

e-mail: [email protected] internet: http://www.sebakmt.com

Hagenuk KMT GmbH

All rights reserved. No part of this manual may be photocopied or reproduced in any other form without the prior written consent of Hagenuk KMT GmbH.We reserve the right to change the contents of this manual without notice. Hagenuk KMT GmbH shall not be liable for any technical or typographical errors or omissions in this manual. Nor shall Hagenuk KMT GmbH be liable for any loss which is directly or indirectly attributable to delivery, performance or use of this material.


TERMS AND CONDITIONS OF WARRANTY

Hagenuk KMT Kabelmeßtechnik GmbH grants the buyer a warranty on products sold by Hagenuk KMT in accordance with the terms and conditions listed below.

Hagenuk KMT guarantees that Hagenuk KMT products are at the time of their delivery free from defects in workmanship or materials which substantially reduce their value or serviceableness. This warranty does not cover faults in supplied software. During the warranty term Hagenuk KMT will repair defective parts or replace them with new or as-new parts (with the same operability and service life as new parts) at its option.

Additional warranty claims, in particular claims arising from consequential loss, cannot be asserted. All parts and products replaced under the terms of this warranty become the property of Hagenuk KMT.

Warranty claims on Hagenuk KMT lapse 12 months after the delivery date. Parts supplied by Hagenuk KMT within the framework of the warranty are also covered by this warranty for the remaining warranty term, but for no less than 90 days.

Warranty measures are undertaken exclusively through Hagenuk KMT or a special service shop which is authorized by Hagenuk KMT Kabelmeßtechnik.

Claims under the terms of this warranty are subject to the buyer notifying Hagenuk KMT of defects without delay and no later than within 10 days of the delivery date in the case of perceptible defects.

This warranty does not cover defects or damage caused by the products being exposed to conditions which are not in accordance with the specifications, being stored, transported or used incorrectly, or being serviced or installed by agencies not approved by Hagenuk KMT. The warranty does not cover damage owing to natural wear and tear, force majeure or connection to external parts.

Hagenuk KMT is only liable for claims for damages arising from the violation of claims for repair or replacement in the event of gross negligence or intent. Any liability for ordinary negligence is ruled out.


TABLE OF CONTENTS

1. GENERAL 12

1.1. Safety instructions ...................................................................................... 12

1.2. Specifications .............................................................................................. 15 1.2.1. General system specifications....................................................................... 15 1.2.2. T16/910 measurement receiver..................................................................... 15 1.2.3. T16/960 headphones..................................................................................... 16 1.2.4. T16/940 sensor.............................................................................................. 16

1.3. Scope of supply........................................................................................... 17

1.4. General functional description................................................................... 18 1.4.1. Area of use .................................................................................................... 18 1.4.2. Basic working method ................................................................................... 18 1.4.2.1. Acoustic pinpointing by the search pulse method ......................................... 18 1.4.2.2. Coincidence measurement............................................................................ 19 1.4.2.3. Distance measurement.................................................................................. 19

2. TECHNICAL DESCRIPTION 22

2.1. Functional Description................................................................................ 22

2.2. Mechanical structure................................................................................... 25 2.2.1. T16/910 measurement receiver..................................................................... 25 2.2.2. Power supply ................................................................................................. 25 2.2.3. Status displays .............................................................................................. 26 2.2.4. T16/960 headphones..................................................................................... 26 2.2.5. T16/940 sensor.............................................................................................. 26

3. OPERATION 29

3.1. Safety measures .......................................................................................... 29

3.2. Controls........................................................................................................ 31 3.2.1. T16/910 Measurement Receiver ................................................................... 31 3.2.2. T16/940 Sensor ............................................................................................. 32

3.3. Initial use ...................................................................................................... 33 3.3.1. Fitting the batteries ........................................................................................ 33


3.3.2. Connecting the sensor................................................................................... 33 3.3.3. Connecting the headphones.......................................................................... 34 3.3.4. Fitting the carrying strap ................................................................................ 34

3.4. Operating instructions ................................................................................ 35 3.4.1. Controls ......................................................................................................... 35 3.4.1.1. Battery test .................................................................................................... 35 3.4.1.2. Switching on the system................................................................................ 36 3.4.1.3. LCD illumination ............................................................................................ 36 3.4.1.4. Switching on the high-pass filter.................................................................... 36 3.4.1.5. Muting the headphones................................................................................. 37 3.4.1.6. Setting amplification for the acoustic channel ............................................... 37 3.4.1.7. Setting amplification for the magnetic channel.............................................. 37 3.4.2. Displays ......................................................................................................... 38 3.4.2.1. Bar display..................................................................................................... 38 3.4.2.2. Coincidence displays..................................................................................... 38 3.4.2.3. OVFL display ................................................................................................. 38 3.4.2.4. Distance measurement (time measurement) ................................................ 38

3.5. Pinpointing faults with the system ............................................................ 39 3.5.1. Switching on and operating the system......................................................... 39 3.5.2. Measuring...................................................................................................... 39 3.5.2.1. Line tracing.................................................................................................... 40 3.5.2.2. Precise pinpointing ........................................................................................ 41

3.6. Malfunctions ................................................................................................ 42

3.7. Shutdown ..................................................................................................... 43 3.7.1. Short-term shutdown ..................................................................................... 43 3.7.2. Long-term shutdown...................................................................................... 43

3.8. Storage and transport ................................................................................. 44 3.8.1. Storage.......................................................................................................... 44 3.8.2. Transport ....................................................................................................... 44

4. CARE AND MAINTENANCE 47

5. REPAIR 51


TABLE OF FIGURES

Fig. 2-1 Block diagram, T16/910 measurement receiver......................................... 2-23 Fig. 2-2 Block diagram, T16/940 sensor.................................................................. 2-24 Fig. 3-2 T16/940 sensor.......................................................................................... 3-32


TABLE OF ABBREVIATIONS °C Degrees centigrade A American designation for battery type IEC

R 6 Ah Ampere hours dB Decibels DIN Deutsche Industrie Norm

(German Industrial Standard) h Height HF High frequency Hz Hertz l Length L Live wire/Line LC-Display Liquid Crystal Display LED Light-Emitting Diode m Metres, mass (kg) ms Milliseconds s Seconds UVV Accident prevention regulations applicable

in Germany V Volts VDE Verband Deutscher Elektrotechniker

(Association of German Electrotechnical Engineers)

W Watts Ω Ohm


EC-Declaration of conformity

CE Mark

We, the company

Hagenuk KMT

Kabelmeßtechnik GmbH

Röderaue

D-01471 Radeburg

declare in our responsibility, that the product

Digiphone

is in conformity with the regulations of the Council of European Community for equalization of

the rule and regulation of the member states about electromagnetic compatibility.(EMC-

regulation 89/336/EWG).

This EC- declaration of conformity is the result of tests conducted by the quality assurance

departement of Hagenuk KMT Kabelmesstechnik GmbH according to article 10 of the

regulation and in accordance with the basic standards EN 50081-1 radio emission,

EN 50082-2 Distortion resistivity, the product standard EN 55011 and the basic standard

EN 60801-2 Electrostatical discharges and IEC 1000-4-4 fast transient disturbances.

Radeburg, 16.06.2003 Dr.Iann

Managing Director


CHAPTER 1

GENERAL



1. GENERAL

1.1. Safety instructions

All persons involved in the transport, installation, operation, maintenance and repair of this system must have read this user manual carefully.

The system and its accessories are in accordance with the current state of safety technology at the time of delivery. Owing to the work processes involved, however, there may be parts of the system and its peripherals which cannot be given optimum protection without an unreasonable reduction in function and usability.

The following safety instructions must be complied with.

GENERAL INSTRUCTIONS

Work on this system and its peripherals must only be performed by qualified and/or trained staff. Other persons must be kept away.

This user manual must be available for the supervisory, operating and maintenance staff to refer to.

Improper use may endanger life and limb, the system and connected equipment, as well as the efficient functioning of the system.

Always use correct tools in perfect condition.

Checks must be made to ensure that the relevant safety regulations are being complied with.

Only operate the system if it is in technically perfect condition.

No non-original parts may be used for the system and its peripherals, as the necessary safety will not be guaranteed. No mode of working which detracts from the safety of the system must be used.

The user is under an obligation to report any changes in the system to the supervisor responsible without delay.


ELECTROTECHNICAL INSTRUCTIONS

The system and all additional equipment must be connected properly. The relevant DIN and VDE regulations must be complied with.

Maintenance work must only be carried out when the system is switched off (dead) and then only by qualified and/or trained staff.


INDICATIONS USED IN THE DESCRIPTION

Important instructions concerning personal protection, work safety and technical safety are indicated as follows:

WARNING: Warning indicates work and operating procedures

which must be complied with in full to exclude the

possibility of persons being put at risk. This

includes instructions concerning particular dangers

when handling the system.

ATTENTION: Attention indicates work and operating procedures

which must be complied with in full to prevent the

system/peripherals from being damaged or

destroyed.

N.B.: N.B. indicates special technical requirements to

which the user must pay particular attention when

using the system.


1.2. Specifications

1.2.1. General system specifications

Operating temperature range: -20°C...+50°C

Storage temperature range: -40°C...+70°C

Relative atmospheric humidity

during operation: 85%

during storage: 95%

Protection class: IP 54 (except plug

connectors)

1.2.2. T16/910 measurement receiver

General specifications

Housing structure: Twin-shell plastic

housing with integrated

battery

Compartment Dimensions: 92 mm x 245 mm x 130

mm (H x W x D)

Weight: 1.25 kg (with batteries)

Electrical specifications

Power supply: 10 round cells

type IEC R 6 (A)

(alkali manganese)

Operating time: With round cells with a

rated capacity of 2000

mAh:

> 10 hours of

intermittent operation

with half continuous

output power on

headphones at +20°C


Continuous output power: 0.07 W

Amplification, acoustic channel: 0 to 65 dB adjustable

Amplification, magnetic channel: 0 to 50 dB adjustable

Operating displays: Operation indicated by

LCD ON

BATT display

FILTER display

OVFL display

" " symbol display

1.2.3. T16/960 headphones

Type: 8 per system

Connector: 4-pin division 72°

Connecting lead: Coiled lead

1.2.4. T16/940 sensor

Housing structure: Single-shell injection-

moulded housing with

screw- on carrying rod

Weight with carrying rod and foot: approx. 1 kg

Dimensions without carrying rod with foot

Diameter 70 mm

Height 240 mm

Length of carrying rod: 500 mm, two-part


1.3. Scope of supply

T16/910 measurement receiver with carrying strap (removable)

T16/960 headphones

T16/940 sensor with carrying rod

- Foot

- Point

- Ground plate

1 set of batteries IEC R 6 (A)

1 case V022

1 user manual


1.4. General functional description

1.4.1. Area of use

The system is portable and suitable for use in the field. It is used for the precise pinpointing of flashover faults in cables.

1.4.2. Basic working method

The system, which consists of a T16/910 measurement receiver, a T16/940 sensor, including accessories, and T16/960 headphones is intended to perform "Acoustic pinpointing by the search pulse method".

The system has facilities for two measuring procedures, coincidence measurement and relative distance measurement.

1.4.2.1. Acoustic pinpointing by the search pulse method

A surge pulse generator is used at the start of the cable to feed voltage pulses into the defective wire, producing flashovers (arcing) at the fault point. The resulting flashover noise propagates through the ground and can be detected at the surface using a seismic sensor. The criterion for the fault location is the greatest loudness of the flashover noise or, in the case of distance measurement, the smallest propagation time difference (see section 1.4.2.3).

In general, the interference signals which occur owing to environmental influences are large in comparison with the levels of flashover noise to be expected, which means that aids are used to recognize the noise. One simple option is a connectable high- pass filter to suppress low-frequency interference quantities (e.g. traffic noise). The useful quantities and interference quantities are often in the same frequency range, however, so another aid is used. This is the coincidence measuring method. The system is equipped with all the aforementioned aids.


1.4.2.2. Coincidence measurement

In this measuring procedure the magnetic field generated by the search pulse is evaluated together with the flashover noise. The appearance of the magnetic signal is displayed optically, making it possible for the user to correlate it with the appearance of the flash-over noise on the headphones. The "simultaneity" (= coincidence) helps to separate the flashover noise from the interference noise.

1.4.2.3. Distance measurement

A better criterion for the fault location is the minimum propagation time difference between the magnetic signal and the acoustic flash-over signal. This difference is caused by the different propagation velocities of the two signals in the ground. Measurement of the pro-pagation time difference is largely independent of the amplitude of the useful signal. Measurement can be a problem in surroundings with interference. The magnetic field propagates at approximately the speed of light, while the flashover noise propagates in the ground at approximately the speed of sound in air, depending on the nature of the ground, i.e. considerably slower. The propagation time difference is smallest directly above the fault point.

The difference is a relative measurement of the distance from the measuring point to the fault point. That is why this method is called distance measurement. It offers additional reliability in comparison to the criterion of the maximum loudness in the headphones, as maximum loudness cannot be established, or can only be estab-lished in the wrong place, in the case of cables laid in pipes. The use of this measuring method can be a problem in surroundings with interference.


CHAPTER 2

TECHNICAL DESCRIPTION



2. TECHNICAL DESCRIPTION

2.1. Functional Description

The functional description refers to the block diagrams in Fig. 2-1 and Fig. 2-2.

The T16/910 measurement receiver processes two analog signals supplied by the T16/940 sensor.

The acoustic signal is converted into an electric voltage by the seismic pick-up in the sensor. This is amplified and prefiltered in a two-stage charge amplifier.

The "acoustic channel" of the T16/910 measurement receiver consists of a two-stage preamplifier with adjustable amplification. A high-pass filter can be connected to suppress interference if so wished.

With a power output stage the signal can be monitored with the T16/960 headphones. The output signal of the preamplifier also goes to a trigger circuit, which generates a digital signal for the timing logic and the coincidence display if a threshold value for the acoustic signal level is exceeded.

The magnetic signal is detected by means of a ferrite antenna in the sensor and amplified. The "magnetic channel" consists of a two-stage preamplifier with adjustable amplification. After a rectifier circuit the signal goes via a LEVEL adjustment circuit to the bar graph driver circuit, which drives the ten-place bar display on the LCD. The deflection of the bar display is a relative measurement of the amplitude of the magnetic signal. The output signal of the rectifier circuit also goes to a trigger circuit, which generates a digital signal for the timing logic and the coincidence display if a threshold value for the acoustic signal level is exceeded.

When battery capacity is being measured, the battery voltage level appears on the bar display instead of the magnetic signal.


The timing logic measures the time difference between the occurrence of the magnetic

trigger signal and the appearance of the acoustic signal, and displays it on a three-place,

seven- segment display in a measuring range of 0 to 99.9 ms.

dig i2.drw

Power supply Keyboard logic

Rectifier c ircuit Trigger c ircuit

Trigger c ircuit

H igh-pass filter

Level

adjustment

circuit

Magnetic Channel

Acoustic Channel

Preamplifier

2-stage, V =

0 to 65 dB

Headphones

output driver

D isplay control log ic

Bar g raph

driver

Timer logic

LCD

Control log ic

for the

7-segment

display,

coincidencedisplay and

other status

displays

Headphones output

T 16/980

Battery status

electronics

D isplay

illumi-

nation

from

sensor

from

sensor

Preamplifier

2-stage, V=

0 to 50 dB

T 16 / 940

T 16 / 940

Fig. 2-1 Block diagram, T16/910 measurement receiver


DIGI3.DRW

Acoustic Channel

Magnetic Channel

Seismic

pick-up

Ferrite antenna

Preamplifier

2-stage

Preamplifier

1-stage

V = 6 dB

to T16/910

measurement receiver

10kHz

Fig. 2-2 Block diagram, T16/940 sensor


2.2. Mechanical structure

2.2.1. T16/910 measurement receiver

The housing consists of two half-shells fastened together.

The bottom half-shell contains the compartment for the round cells. This compartment is isolated from the rest of the housing to protect the electronic devices from any battery leaks. The system has electrical reverse-battery protection. The display and controls are integrated in the top half-shell in the form of a membrane keypad.

The electronic devices of the T16/910 measurement receiver are mounted on two PCBs. The membrane keypad and battery compart-ment are connected to the PCBs by means of plug connectors.

To allow greater freedom of movement while working with the system, the T16/910 measurement receiver is equipped with a carrying strap. The carrying strap is easy to fit by means of two locking buttons.

2.2.2. Power supply

The system is powered by 10 round cells.


2.2.3. Status displays

The T16/910 measurement receiver is equipped with the following status displays: Compare Fig. 3-1.

Display Function

BATT (5) Battery test active

FILTER (16) High-pass filter active

Symbol (17) Display illumination

active

ON (14) System switched on

OVFL (6) Measured value

overflow

2.2.4. T16/960 headphones

The system includes headphones for monitoring flashover noise.

The headphones have been specially adapted for use with the system.

2.2.5. T16/940 sensor

The pick-up, the entire sensor circuit and the ferrite antenna are accommodated in a housing. The top part of this housing also takes the form of a handle, which can be extended to a good length for moving by means of a two-part carrying rod.

A foot, point and ground plate are provided for optimum pick-up contact with the ground. Measurements can only be performed with the foot, a combination of foot and point, or with the foot and ground plate for better contact. Compare Fig. 3-2.


CHAPTER 3

OPERATION



3. OPERATION

3.1. Safety measures

ATTENTION: Pinpointing requires a pulse generator. The pulse

generator produces high voltages and its operation

requires that certain safety regulations be complied

with. For further information read the manual for

the pulse generator. When the search pulse

method is used on lighting installations, the masts

must be protected during measuring owing to the

high voltages (shock protection mats, etc.).

The following safety measures must be complied with to avoid personal injury or material damage as a direct result of operation of the system by itself or in combination with other equipment:

Check the immediate area surrounding where the system is being used for any unprotected live equipment/plant with which you or the system might unintentionally come into contact. In particular, this applies to high-voltage components ( 25 VAC / 60 VDC) and components with an unknown voltage.

WARNING: Never perform measurements on exposed cables!

Protect such components by fitting insulating covers. If this is not possible for technical reasons, switch such components off or have this done for you for the duration of your work at this site by prior agreement with/with the prior approval of the supervisor responsible. Make sure that this has been done properly (e.g. by making control measurements using a multimeter which you have made sure is working properly: perform control measurement on a known voltage, etc.).


Make sure that the proper functioning of other equipment/plant is not impaired during measuring with the system. If other equipment/plant has to be modified for operation of the system, make sure that such measures are reversed once the work has been completed. The special requirements of such equipment/plant must be complied with, and only perform work in this connection by prior agreement with/with the prior approval of the supervisor responsible. This is particularly important in the case of interference with existing safety devices.

WARNING: Harmful sound levels may occur on the headphones during monitoring of flashover noise owing to additional airborne sound and the amplification being set too high.


3.2. Controls 3.2.1. T16/910 Measurement Receiver

Fig. 3-1 Controls, T16/910 measurement receiver

Key for Fig. 3-1

1 = ON/OFF button 2 = BATT TEST button 3 = Input socket for T16/940 SENSOR (not visible) 4 = ILLUM button for LCD illumination 5 = Bar display shows capacity of batteries or rel. value of magnetic signal amplitude 6 = OVFL display, appears when magnetic signal is triggered and sound indication > 99.9 ms < 1 s 7 = Display indicates triggering of magnetic channel 8 = Potentiometer Magn.adjusts magnetic signal amplification

9 = Button for muting headphones 10 = Input socket for headphones 11 = High-pass filter on/off 12 = Potentiometer Sound adjusts acoustic signal amplification

13 = Mark 14 = Display indicates triggering of acoustic channel 15 = ON appears on measuring receiver LCD when system is switched on 16 = FILTER appears on LCD when high-pass filter is connected 17 = symbol appears when ILLUM is switched on

16 14 13 12 11

2

1

3

4

5 6 7 8 9

10

17 15

ON


3.2.2. T16/940 Sensor

T160302.DRW

Fig. 3-2 T16/940 sensor

Key for Fig. 3-2

1 = Carrying rod

2 = Sensor

3 = Foot

4 = Ground plate

5 = Point


3.3. Initial use

3.3.1. Fitting the batteries

The T16/910 measuring receiver has to be fitted with 10 round cells type IEC R 6 (A):

- Remove back (turn-lock fasteners open anticlockwise)

- Fit round cells in compartment provided, check polarity

- Replace back and close turn-lock fasteners by turning clockwise

The system is ready for operation.

ATTENTION: Remove and replace batteries in shelter from

extreme environmental conditions (e.g. rain,

temperatures < 0°C, heavy dust pollution, etc.).

3.3.2. Connecting the sensor

Plug sensor cable into input socket (3) on right-hand side of T16/910 measurement receiver.

For optimum contact of the acceleration pick-up with the ground, the contact attachment must be chosen to suit ground conditions. Wind conditions determine whether the carrying rod (1) should be fitted as an aid for moving the sensor.

For hard ground, asphalt Ground plate

For softer ground Foot and point or foot only


For hard-to-hear faults on Fit ground plate and place on softer ground stones embedded in ground

(remove carrying rod)

In strong wind Move sensor using handle on sensor housing only (remove carrying rod)

In slight wind or calm Fit carrying rod for moving sensor

3.3.3. Connecting the headphones

Plug headphones into input socket (10) on the left-hand side of the T16/910 measurement receiver.

WARNING: Harmful sound levels may occur on the

headphones during monitoring of flashover noise

owing to additional airborne sound and the

amplification being set too high.

3.3.4. Fitting the carrying strap

The carrying strap supplied with the system can be secured to the sides of the T16/910 measurement receiver using two locking buttons. To do this, plug the top halves of the two buttons onto the bottom halves on the measurement receiver.


3.4. Operating instructions

3.4.1. Controls

3.4.1.1. Battery test

The battery test is performed for as long as the Battery test button (2) is pressed.

The battery test function can be used independently of the system operating mode on the T16/910 measurement receiver. If the system is switched on, the operating status prior to the battery test being started will be restored once measurement of the battery capacity has been completed. If the system is not switched on prior to the battery test, it will switch off again automatically once the test has been completed.

N.B.: The battery test can also be performed if the

sensor is not connected.

The capacity of the batteries is shown on the LCD bar display (5). Within the boxed area the battery capacity is large enough for the system to function. If the bar display shows a value to the left of the boxed area, the batteries should be replaced.


3.4.1.2. Switching on the system

WARNING: It is vital that Potentiometer Sound (12) is turned

as far to the left as it will go before switching on.

The system is switched on with the On/Off button (1) on the T16/910 measurement receiver. The operating mode is indicated by ON (15) on the LCD. OVFL (6) will also be displayed. This indicates that the time value displayed by the timer after switching on is not relevant.

To switch off, press the On/Off button (1) once more.

The system can only be switched on again after a built-in time delay!

N.B.: The T16/910 measurement receiver can only be

switched on if the T16/940 sensor is connected.

3.4.1.3. LCD illumination

LCD illumination becomes active when the Illum. button (4) is pressed. The lamp symbol (17) will appear on the LCD. To switch off the illumination, press the button again.

3.4.1.4. Switching on the high-pass filter

The filter can be connected or disconnected using the Filter button (11). The FILTER display (16) appears on the LCD when the filter is active.


3.4.1.5. Muting the headphones

The system's T16/910 measurement receiver has a button (9) for switching the headphones off for a short time. The headphones are muted for as long as the button (9) is pressed. When the button is pressed, headphone signals caused by movement of the sensor equipment are avoided.

3.4.1.6. Setting amplification for the acoustic channel

The volume of the signals on the headphones is set using the Sound

potentiometer (12). The trigger for the coincidence display (14) is set at the same time with this control.

WARNING: It is vital that Potentiometer Sound (12) is only

operated to the right of the warning triangle (13) in

exceptional circumstances.

Even low ambient noise can cause high sound

levels on the headphones in the area to the right of

the warning triangle.

3.4.1.7. Setting amplification for the magnetic channel

The amplification for the magnetic channel is set using the Magn.

potentiometer (8). It provides optimum adjustment of the bar display deflection and sets the trigger level for the coincidence display (7).


3.4.2. Displays

3.4.2.1. Bar display

The deflection of the bar display is a relative measurement of the magnetic signal amplitude. It provides simplified line tracing (see section 1.4.2.2.).

During battery testing it indicates the capacity of the batteries.

3.4.2.2. Coincidence displays

The coincidence display (7) appears when the magnetic channel is triggered. The coincidence display (14) appears when the magnetic channel is triggered together with the acoustic channel within 1 s.

3.4.2.3. OVFL display

The OVFL display (6) appears on the LCD when the magnetic signal is triggered followed by an acoustic signal of > 99.9 ms and < 1 s, in which case the 3-place display will not show a measured value. The OVFL

display (6) also appears after the system is switched on until the magnetic channel is triggered for the first time.

3.4.2.4. Distance measurement (time measurement)

A three-place, seven-segment display on the LCD indicates the propagation time difference between the magnetic and acoustic signals in a time window of 0 to 99.9 ms. The displayed value is retained until the magnetic channel is triggered again. The OVFL display (6) also appears after the system is switched on until the magnetic channel is triggered for the first time.


3.5. Pinpointing faults with the system

3.5.1. Switching on and operating the system

The numbers after the controls refer to Fig. 3-2.

- Plug the T16/940 sensor into the input socket (3) on the T16/910

measurement receiver

- Plug the T16/960 headphones into the input socket (10) on the

T16/910 measurement receiver

- Switch the system receiver on using the On/Off button (1) on the

T16/910 measurement receiver

The ON display (15) will appear on the LCD.

3.5.2. Measuring

Pinpointing is always preceded by pre-location and a line or cable search.

For the purposes of the system, high-voltage pulses are supplied at the start of a cable using a pulse generator. These pulses generate flashovers at the fault point.

Pre-location is used to determine the section of cable with a fault and to check the occurrence of flashovers.

To operate and connect the pulse generator, please refer to the manuals for the unit in question.


3.5.2.1. Line tracing

The system can be used to perform line tracing of a limited scope in comparison to specialist line tracing equipment.

- Place the T16/940 sensor on the ground with the printed arrow

pointing along the suspected cable route.

- Using the Magn. potentiometer (8), set the signal amplification for the

magnetic channel in such a way to start with that the coincidence

display (7) appears and at least one bar (5) of the field strength

display appears at the same time.

- Seek the maximum deflection by turning the senor slowly around its

vertical axis. The arrow will then be pointing parallel to the cable route.

- Move the sensor at right angles to the route, keeping the arrow

pointing parallel to it. The cable route is at the point where the

maximum deflection of the bar display occurs.

- Move the sensor along the route while waving it at right angles to it.

The cable route can be followed easily and marked using the

maximum deflection of the bar display. The Magn. potentiometer (8)

may have to be readjusted.


3.5.2.2. Precise pinpointing

- Place the T16/940 sensor on the ground in such a way that the arrow

points along the cable route. Select the appropriate contact

attachments from the accessories to ensure optimal sensor contact

with the ground, depending on the ground conditions. Use the correct

attachments for moving the sensor, as dictated by the wind

conditions. See section 3.3.2 in this connection.

- Using the Magn. potentiometer (8), adjust the signal amplification for

the magnetic pulse until the trigger display (7) appears and the

measuring signal is visible on the bar display.

- Using the Sound potentiometer (12), adjust the signal amplification for

the acoustic channel until noises are clearly audible on the

headphones.

WARNING: Harmful sound levels may occur on the

headphones during monitoring of flashover noise

owing to additional airborne sound and the

amplification being set too high.

- Place the T16/940 sensor on the cable route at intervals of approx. 0.5

m to 1 m and monitor ground noises. The flashover noise can be

heard in the vicinity of the fault. The coincidence display (7) serves as

an indication of the time of the event. Mark the point with the

maximum loudness (= suspected fault point).

- Using the Sound potentiometer (12), adjust the signal amplification for

the acoustic signal until the flashover noises can be heard well and

the trigger display (14) appears.


N.B.: The T16/910 measurement receiver is equipped

with a high-pass filter. The high-pass filter can be

used to suppress interference signals. The filter is

activated with the Filter key (11).

- If the coincidence display (7) appears and the acoustic channel is

triggered within 99.9 ms of the appearance of the magnetic signal

appearing, the time difference value will be indicated on the three-

place, seven-segment display.

- If the coincidence display (7) appears and the time difference to the

acoustic signal is > 99.9 ms and < 1 s, the OVFL display (6) will

appear on the LCD. If no acoustic signal appears within 1 s of the

magnetic signal, measurement will be restarted.

- As you approach the fault point, the time difference between the

magnetic and acoustic signals will become smaller and the value

shown on the display will decrease. You should always wait for

several propagation time measurements at a measuring point. If the

same value appears several times, you can be sure that it is "correct".

The smallest value shown on the LCD indicates the fault point.

- If the loudest point and the point of the smallest time difference agree,

you can be sure that you have found the fault point. Location of the

point by distance measurement is to be preferred to measurement by

loudness (see 1.4.2.3.) if propagation time measurement fails to

indicate a "constant" value over several measurements owing to

interference quantities.

3.6. Malfunctions

In the event of the system malfunctioning, it must be checked by authorized after-sales service unless the fault(s) can be rectified on the basis of the instructions contained in Chapter 5.


3.7. Shutdown

3.7.1. Short-term shutdown

Switch off the T16/910 measurement receiver by pressing the On/Off button (1) again. The ON display (15) will disappear.

In the case of shutdown for up to a month, no special measures have to be taken. Only the environmental conditions for storage as stipulated in the specifications have to be complied with.

N.B.: Immediately after it has been switched off, the

system can only be switched back on again after a

built-in time delay!

3.7.2. Long-term shutdown

If shutdown in excess of a month is expected, the batteries must be removed from the T16/910 measurement receiver and stored separately.


3.8. Storage and transport

3.8.1. Storage

The system should be stored in dry surroundings which offer adequate protection against mechanical damage and dirt.

ATTENTION: The environmental conditions stipulated in the

specifications are threshold values, and damage

may occur if they are exceeded.

Before using the system again after storage, check the outside for damage and dirt. Pay particular attention to the sockets for the sensor and headphone leads and the battery compartment.

A performance check should normally be performed before using the system again after storage. To do this, follow the steps described in Section 3.3., Initial use, then perform a measurement on a suitable object.

3.8.2. Transport

Only use the case provided for transport. Please comply with the environmental conditions stipulated in the specifications.

ATTENTION: Never use the connecting cable as a "carrying

handle".


CHAPTER 4

CARE AND MAINTENANCE



4. CARE AND MAINTENANCE

The system does not contain any components which require care and maintenance on a regular basis if they are to work properly.

Please remove external dirt with a soft, dry cloth or with a soft cloth slightly moistened with mild household cleaner.

Please do not use any solvents such as alcohol or naphtha, as they may attack the surface of the housing.

The sensor and accessories are subject to particularly harsh operating conditions. Thorough cleaning after each use in the field is therefore to be recommended.

As a matter of principle, the foot (Fig. 3-2 [3] and ground plate (Fig. 3-2 [4]) should always be cleaned thoroughly and smeared with a thin coating of non-corrosive silicone grease after use in the field.

ATTENTION: Do not allow moisture to penetrate the sockets for

the headphones and sensor of the T16/910

measurement receiver and the battery compart-

ment under any circumstances. The sensor is a

sensitive piece of equipment.

High mechanical loads such as those which would

occur if the sensor were dropped on a hard surface

are therefore to be avoided.



CHAPTER 5

REPAIR



5. REPAIR

Fault Cause Remedy

digiphone seismic location

equipment cannot be

switched on

1. No power supply

No batteries fitted or batteries

not fitted properly Batteries

flat

Fit batteries and check

battery capacity using bar

display

2. Sensor connector

not plugged in or not plugged

in properly

Plug sensor connector in

(properly)

3. Failure of electrical

components

Fault still present? Notify after-sales service

Fault Cause Remedy

No signal on headphones 1. Mute button

depressed

Release mute button

2. Headphones

connector not plugged in or

not plugged in properly

Plug headphones in

(properly)

3. Sound control at left stop

Turn Sound control clockwise (mark )


components in measurement

receiver or sensor


5. Headphones

defective


Fault Cause Remedy

System displays functional

weaknesses

1. Batteries too weak Fit new batteries

e.g. Coincidence

displays fail or headphones

signal distorted



receiver or sensor

3. Headphones

defective


Display illumination not

working

1. Illumination button

not pressed

Press illumination button

symbol must appear on display

2. Failure of electric


receiver


Fault Cause Remedy

No coincidence display

No time measurement

1. Level for Sound

and/or Magn. too low

Turn controls for Sound and Magn. clockwise until coincidence displays appear


2. Sensor not right

over cable route

Place sensor over cable

route

3. No search pulse

supplied to cable

Check whether search pulse

is being supplied to right

cable

4. Sound signal interference from background noise

Ensure quiet surroundings,

connect filter

5. No flashover at

fault point

Check whether flashover is

taking place at fault point



receiver or sensor


Documents

MAN Digiphone Eng 02