GL McGAVIN MODIEWARK DC50 Manuale utente
2
Warning
High voltage testing should only be carried out by trained personnel.
Do not hold this instrument in your hand when testing uninsulated voltages
above 300VDC.
Fiberglass Operating sticks must be used.
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This device is for indication only and should only be used by trained
personnel on the safe operations of the device.
Warning. the indicator will not indicate when conductors are in a high
field area, close proximity to one another, in a metal case enclosed
spaces or in armored metal screen cable.
The DC field can be compromised and the device will not indicate, it is
recommended from the manufacturer if adequate space, approach the
conductor from 360 degrees and on the high setting get within 5 mm.
Before touching conductors prove the conductor is zero volts using
existing convention testing equipment.
3
Touchpad
4
Fire and Rescue DC50 and AC30
Tester Kit
5
Unit Operations
Get close enough to the emergency without touching the power source.
Attached the indicator to an electrical stick IF REQUIRED. Please see your
training requirements, for safety and personal protection.
Turn on the device, press the Power Button.
A single RED LED will illuminate
Press the green ON/Self-Test Button. The unit is now operational.
The SELF TEST button can be pressed at any time TO TEST
the device is functioning correctly. All LEDS will light and a
green light will indicate the device is ready. If a red light
indicates change the batteries.
By pressing the blue arrow up and arrow down button, the
single RED illuminated LED will switch between L.E.D 8
and L.E.D 1.
Note: LED 8 is the most sensitive and LED 1 is the least
sensitive.
6
How to test
1. Rub the foam lid of the case with
your hand to build up static
electricity (the more you rub the
higher the voltage charge will be)
2000 volts + can be generated.
2. Turn the indicator on and approach
the lid, the Indicator will light up as
you approach the lid of the case.
3. If The device if functioning
correctly the indicator will activate
as you approach.
7
Approach a known live conductor.
As the indicator moves into an electric field the indicators LEDS from 1 to 8 will
illuminate and an audio alarm will sound.
When all of the LEDS up to number 8 are indicated the audio alarm will be on
constant.
Insert the batteries correct polarity + to touchpad.
8
Static Electricity 10 volts to
10,000+ volts
The DC50 tester is designed to pick up an electric field emanating from an
active DC source as low as 50v dc.
Static electricity can be found on almost any surface.
Static electricity is an imbalance of electric charges within or on the surface of a
material.
The charge remains until the indicator is moved away from the area or by means of
an electric current or electrical discharge.
A static electric charge can be created whenever two surfaces contact and
separate, and at least one of the surfaces has a high resistance to electric current
(and is therefore an electrical insulator).
The effects of static electricity are familiar to most people because it can be felt,
heard and visually seen as a spark as the excess charge is neutralized when
brought close to an electrical conductor, or a region with an excess charge of the
opposite polarity (positive or negative).
The familiar phenomenon of a static shock –more specifically, an electrostatic
discharge –is caused by the neutralization of charge.
Static electricity is everywhere and is all around us. static electricity can be generated by simply rubbing
a piece of plastic on your shirt and removing it.
Dealing with Static charge has been the hardest phase to overcome to
manufacture.
9
How to combat static electricity
Once a DC power source is terminated in a plastic insulted cable, but not
earthed (grounded), a static charge remains present on the insulation, this will
slowly dissipate over time.
The DC50 indicator will read this static residue left behind and over time the
indicator sensitivity lights will stop indicating.
From trials conducted it can take up to several minutes for the static charge to
dissipate. The time is dependent on the thickness of the insulating material
and its composition.
Earthing the cable instantly removes the static charge in the cable.
Alternatively, you can Spray the target area with antistatic spray.
Approach the area to be tested, if the device alarms, repeat the process until
the DC50 does not pick up any signal.
If you test where live DC supply is present and the power is turned off, the
indicator will still show a decreasing DC field (static discharge).
If the insulated cable is sprayed with the antistatic spray it will negate the static
charge showing the operator that no potential is present.
10
Usages
The indicator can be used where DC voltages are present.
•Electric trains 1500 vdc
•Electric trams 600vdc
•Underground mining vehicles 1800 vdc+
•Power station’s 50-600 vdc
•Control and switch gear 200 vdc
•Under sea direct current power lines 1000vdc+
•Solar arrays 200 to 1000vdc
•Electronic Environment’s where static is an issue.
•Aluminum Smelters
•Aircraft
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GL Mcgavin Pty. Ltd. cannot authorise the method of use. Power
distribution authorities have trained personnel who can advise on the
operation and use. This document is developed from general principles
and it may not be suitable for all conditions and localities contemplated
by it. This document may be used only on the condition that GL McGavin
Pty Ltd disclaims all liability.
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