AGMel A694 User manual

No display

dim display

Dead battery.

Instrument failure.

Unstable

measurement

Dead battery.

Cable to test not faulted.

Measurement carried out

immediately after a voltage

test.

Cable to test too short.

Cable to test not connected.

Broken test leads.

Instrument failure.

US R MANUAL

Short circuit locator

for metallic cables

Mod. A694

SERVICING INFORMATION

If you have questions or need further

assistance, please email us at

[email protected]

Our complete catalog can be viewed,

printed or book marked from our

website: www.agmel.com

AGM Elettronica

Via Marziale, 9

80067 Sorrento (NA)

Italy

Tel +39 3334288922

Fax+39 081 8071249

www.agminstruments.com

-mail: [email protected]

AGMel

EA694 Rev 5 12/14

2002/95/EC

TROUBLES OOTING

EXAMPLE

Faulted cable is 25000 meters long.

The value read in position ” ”, L ,

is 24.7%, the value LB is 24.7 %.

the cable has only one contact

at distance:

24.7 x 25000 = 6175

100

meters from the Outside end of the

cable.

SPECIFICATIONS

Can test cables with a loop resistance

between 0.1 and 40.000 

Range: > 100 km @ 400 /km

Basic accuracy: ± 0.1 % ± 1 digit

Test current: 0.2  500 mA

Power: 9 V PP3 style alkaline cell

Battery life: 1000 measurem. @ 50 

Weight: 400 g

Dimensions: 191 x 102 x 57 mm

CALIBRATION

Our instruments are calibrated using

the following standards

Datron 4705 Autocal Multifunction Calibrator

Yokogawa 7563 Precision Digital Thermometer

GenRad 1686 Digital Capacitance Meter

Agilent 66309D Mobile Communic. Source

HP 34401 Multimeter

HP 34970A Data Acquisition Unit

Burster 1424 I 488 High Precision Decade

Tettex 3200/BU Standard Resistor

AOIP 0,01 Ω Standard Resistor

Tettex Decade Capacitors

ARCO Standard Capacitors

JBC 5001 Standard Capacitor

Lecroy LT264ML Oscilloscope

Haefely PU12 Impulse tester

Schaffner NSG431 lectr. Discharge Simulator

Lecroy 9109 Arbitrary Function Generator

Norbar 40051 Torque meter

HP 3577A Network Analyzer

Agilent 4406 VSA Tester

Agilent 33120A arbitrary waveform generator

1 battery holder 4 probes connector

2 display 5 measure mode select

3 measure switch

DESCRIPTION

The A694 is a short circuit locator for

electric and telephone cables wind on

the reel; it gives the position of the

fault from the inside or outside end of

the cable, in percentage to the total

cable length.

OW TO USE IT

Ground the cable to be tested from

any electrical charges.

If wire “A” is short with “B”, connect

the crocodile clips to the cable:

1) the crocodile clip “I” to “A”

from the inside end.

2) the crocodile clip “E” to “A”

from the outside end.

3) the crocodile clip “COM” to

“B” from the outside end.

Perform a calibration test:

turn the measure mode knob to “Ref”

and push the measure switch, the

display will show 100.0 ± 0.1 %,

otherwise:

a) the cable has a total

resistance below 0.1 Ω

b) the cable has some

electrostatic charges within

c) the test leads are broken.

Connect

wire

with

test lead

A E

COM

A I

Lead connections

Turn the measure mode knob to “ ”

and push the measure switch, read on

the display the value L , length of the

cable (in percentage to the total cable

length) from clip “ ” to the short.

Switch the crocodile clip “COM”

to wire “B” from the inside end

push the measure switch, read on the

display the value LB.

If L = LB ± 0.1 %, then the cable has

just one short at distance:

(Value LE) x (total length of cable)

100

from the outside end of the cable.

If L ≠ LB ± 0.1 %, the cable has

more than one short and the distance

to fault is calculated making use of the

program a694503e.exe downloaded

from the website www.agmel.com .

WARNINGS AND SAFETY RULES

The locator is protected against

electrical charges, but in some

conditions these charges on the wire

can accumulate and can be

dangerous for the technician,

therefore

always ground the cable

before any measurement

Do not short the clips “I” with “ ” for a

long time, otherwise the battery life

will be reduced.

The calibration test is possible only

after a cable is connected.

The crocodile clips “I” and “ ” are

special Kelvin clips, do not force the

opening.

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