Nemtek Fence Meter Manuale utente

1 Introduction

The NEMTEK Fence Meter measures the electrical condition of an electric fence.

By holding the meter against the fence wire the meter will turn on automatically

when it detects a fence voltage. The fence voltage, current and the direction of

a possible fence fault will be displayed on the LCD. The meter will automatically

turn off after a few seconds when not in use.

2 Technical Specifications

Parameter

Value

Voltage Display Range

-14kV to 14kV

Current Display Range

1A to 85A

Automatic Turn-On Voltage

<-150V or >150V*

Battery Type

2 x 1.5V AAA

Battery Life

~150 hours

Operating Temperature

-10°C to 50°C

*Measured at a pulse length of 100ms and direct earthing

3 Warnings

1. This product is not intended for use by persons (including children) with

reduced physical, sensory or mental capabilities, or lack of experience and

knowledge, unless they have been given supervision or instruction

concerning use of the product by a person responsible for their safety.

2. Electric fencing can be lethal. Avoid any head contact with the fence.

3. Do not attempt to use or store this product in the presence of excessive

moisture, as this may lead to electrical shock.

4. Do not attempt to measure voltages in excess of 14 kV as this may damage

the device or cause electrical shock.

5. Do not attempt to measure any other electrical outputs other than that of

electric fence energizers complying with the IEC 60335-2-76 specification.

4 Screen Layout

5 Operation

5.1 Holding the meter

•Grip the fence meter tightly in your

hand, taking care not to grip too

close to the electric fence wire,

contact strip or LCD screen.

•This meter makes use of capacitive

coupling between the user, meter

and earth and therefore, a firm

grip with sufficient skin contact will

ensure a more accurate reading.

•A more accurate measurement can

be achieved by holding on to a ground point like a ground wire, grounded

metal pole etc. with your other hand while taking a measurement.

5.2 Taking a measurement

•Place the live fence wire in the slot

of the measuring tip, making sure

there is good contact between the

fence wire and the metal strip.

•If there is a voltage pulse in

excess of 150V present on the

wire, the Fence Meter will turn on

automatically and display the fence

voltage, current and if present, the

direction of a possible fault

(see screen layout in section 5).

If the fence voltage is more than

150V, but less than 0.5kV, the

meter will turn on and show 0kV.

•If the energizer has a negative voltage output or in some instances,

where the ground fence wire is measured, the negative voltage

indicator will be displayed.

•If the current in the fence wire is less than 2A, no fault direction arrows

will be shown.

•If the Fence Meter does not detect an energizer pulse for 10 seconds,

the meter will automatically switch off.

•Measurements taken in close proximity (less than 1m) to the energizer

might not be accurate.

•If only a voltage measurement is desired, it is not necessary to place

the wire in the measuring pin slot, any contact to the metal strip will be

sufficient.

5.3 Battery Replacement

•If the battery symbol is displayed along with the measurements, the

batteries will need replacement soon.

•If only the battery symbol is displayed, the batteries need to be

replaced before any measurements can be made.

•The batteries (2 x AAA 1.5V) can be replaced by loosening the 6 screws

at the back (leave the screws on the belt clip) and opening the meter.

•Ensure the correct polarity as shown on the housing below the

batteries.

6 Finding a Fault

The two most common faults in an electric fence installation are an open-circuit

(wire break, poor connection etc.) fault or a short-circuit (insulator breakdown,

vegetation, live and ground wire touching etc.) fault. In order to facilitate the

fault-finding process, current and voltage measurements at regular points along

the fence when in a healthy condition should be recorded for comparison when a

fault occurs.

6.1 Open-circuit Fault

•Start as close as possible to where the high voltage (HV) leads from the

energizer connects to the electric fence and take a measurement on the

live wire.

•Depending on the location of the open-circuit fault, the current might

be higher than for a healthy fence.

•Take a measurement at regular intervals along the fence, while moving

away from the energizer.

•When the measurement shows a significant drop in voltage and current,

the fault should be between the current and the previous measurement

points.

•Parallel fence wires should be inspected individually following the above

process.

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