TENTECH EM4058 Manuel utilisateur
Formato: 137mm x 190mm
P. 03
P. 31
Manual de uso
Telurómetro digital
Digital earth tester User guide
EM4058
TENTECH CORPORATION
7330 NW 66th ST
Miami, FL 33166
EM-4058
Digital earth tester
User guide
GF-2028
© 2016 TENTECH. All rights reserved.
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The rubbish bin with a line through it means that in the European Union, the
product must undergo selective disposal for the recycling of electric and
electronic material, in compliance with Directive WEEE 2002/96/EC.
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Index
1. Description........................................................................................................6
2. Control panel.....................................................................................................8
2.1. Connections and items...............................................................................8
2.2. Keyboard....................................................................................................9
3. Measurement ranges.......................................................................................10
4. Battery / battery charger..................................................................................11
4.1. Checking battery status............................................................................11
4.2. Recharge procedure.................................................................................11
5. Equipment calibration checking........................................................................12
6. Grounding resistance measurement................................................................13
6.1. Resistance measurement – one frequency...............................................13
6.2. Resistance measurement – frequency SCAN...........................................14
6.3. Observations about grounding diffusion systems (GDS)...........................16
7. Spurious voltages measurement......................................................................17
8. Soil resistivity measurement............................................................................18
9. Abnormalities indications on the display...........................................................21
9.1. Excessively high spurious voltages...........................................................21
9.2. Excessively high earth resistance.............................................................21
9.3. Excessively high resistance in the auxiliary rods.......................................22
9.4. Excessively high soil resistivity.................................................................22
10. Software........................................................................................................23
10.1. USB Drivers...........................................................................................23
10.2. T-Logger software..................................................................................23
11. Remote control..............................................................................................24
12. Printer............................................................................................................25
13. Cleaning........................................................................................................25
14. Technical Specifications................................................................................26
15. Warranty........................................................................................................29
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1. Description
The EM-4058
earth tester is a digital instrument that allows to measure
the Earth resistance and Ground resistivity (using Wenner’s method), as
well as to detect parasitic voltages present in the ground. This instrument
is suitable to measure earth systems in power substations, industries,
distribution networks, etc., according to IEC 61557-5. It is also suitable for
soil resistivity measurements, in order to optimize the earth systems
project. It is fully automatic and easy-to-operate equipment. Before
starting each measurement, the equipment will check that conditions are
within appropriate limits and will notify the operator in case any
abnormality turns up (too high interference voltage, too much resistance
in test spikes, very low test current, etc). Then, it will look for the most
suitable range and show measurement results in an alphanumeric
display.
In order to conveniently test the earth system, EM-4058
allows to perform
measurements using the test current which frequency may be operator
selected (270 Hz, 570 Hz, 870 Hz, 1170 Hz or 1470 Hz). On one hand,
the lowest frequency will allow to analyze the earth system behavior
related to fault currents of industrial frequency, while on the other hand,
the measurement performed with the highest frequency will best show the
behavior in connection with electrical currents caused by lightning and will
offer a very high immunity related to interference voltages that are usually
present in soils, specially near substations.
The instrument has four ranges that are automatically selected, covering
measurements from 0.01 Ω up to 20 kΩ, which allows to obtain very
accurate measurements for any kind of soils. During ground resistivity
measurement, the operator may indicate the distance between spikes in
order for the equipment to apply Wenner’s formula and to show the
resistivity value directly. The EM-4058
has a Frequency Scan feature that
performs an earth resistance measure with all available frequencies
automatically and calculates, display and print the average result besides
the individual result of each frequency. Those results are saved on the
internal memory.
The equipment has a Bluetooth communication interface that allows
remote operation through a Tablet running the Android application. With it
you can save photos of the measurements and the GPS coordinates of
each. Also allows you to record voice annotations to each measurement.
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The EM-4058 has an USB interface that allows to communicate
measured values to a computer or data logger for their later analysis. It is
portable, strong and lightweight equipment, suitable to be used out in the
field and under severe weather conditions. It is powered by a
rechargeable battery with an external 12VDC / 2A power source charger
and it is supplied with all the necessary accessories for measurements
(test spikes, leads, power, supply.) within an auxiliary bag that makes it
simple to carry.
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2. Control panel
All of the EM-4058 buttons, keys, outputs and connections are located on
the panel, and are easily accessible by the operator. The following
graphics show the function of each one of the equipment’s items.
2.1. Connections and items
Output terminal E
Output terminal ES
Output terminal H
Output terminal S
Alphanumeric display
Keyboard
USB communication port
Power supply input
Printer
On / Off key
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2.2. Keyboard
Key Function
ON/OFF switch
Selects the resistance measurement
function
Increase / Decrease. Switch between the frequencies of 270 Hz, 570 Hz,
870 Hz, 1170 Hz or 1470 Hz
Frequency Scan: feature that performs an earth resistance
measure with all available frequencies automatically and
calculates and display the average result besides the individual
result of each frequency
Selects the resistivity measurement
function
Increase or decrease the specified distance between rods in a
progression of 1, 2, 4, 8, 16 or 32 meters. It also allows the
operator to select the Rx function, used to check the equipment
calibration by using a standard resistance (ignoring the “distance”
parameter, not needed in this function)
Increase or decrease the specified distance between rods in one
meter steps.
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Shows the battery charge status on the display
Prints the measurement
Activates the voltmeter
START key; starts the test.
3. Measurement ranges
The EM-4058 automatically selects an adequate range when operating,
allowing measurements between 0.01 Ω and 20 kΩ (resistance), 0.01 Ωm
and 50 kΩm (resistivity), or voltages between 0 and 60 V~ (when in the
voltmeter function).
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4. Battery / battery charger
The EM-4058 uses a 12 V – 3 Ah rechargeable battery. At the end of its
useful life, the battery must be recycled or disposed of properly, in order
to protect the environment.
4.1. Checking battery status
Before starting each test, it is recommended to check if the battery has
enough charge. This can be done by pressing the battery status ( )
key. If the battery charge is low, the following message will appear on the
display:
4.2. Recharge procedure
This equipment has an internal battery charger with a smart circuit which
adjusts the battery charge to the optimized parameters to ensure the
maximum service life. To recharge the battery:
• Check if the equipment is off, and then connect it to the AC Adapter.
• The charging indicator ( ) will turn on red and will
remain that way until the battery is totally charged. Then the light will
remain green and keep in that way until the equipment is disconnected
of the AC Adapter.
Note: If the equipment is turned on, the charging procedure will be momentarily
interrupted till it is again turned off.
Note: battery slowly loses part of its charge while stored, even without use.
Therefore, before using the equipment for the first time, or after a long period out of
use, it may be necessary to recharge the battery.
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