Earth Resistance Tester EM4055
|
| The
EM-4055 earth tester is a digital, microprocessor controlled
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. |
| Features |
|
Earth resistance measurement
Ground resistivity (Wenner's method)
High spurious voltage rejection
Spurious voltage measurement
0,01O resolution
Up to 20KO resistance range
Auto-range
Alphanumerical display
Heavy duty equipment
Automatic interference detection
Rechargeable battery
Built-in printer (optional)
Direct reading of ground resistivity
Up to 50m selectable distance
4000 readings memory
RS-232 data output
IP-54 protection
CE mark
|
 |
| Technical Specification |
| APPLICATION |
Earth resistance measuring of simple
or complex electrode systems, Ground resistivity measurements
(Four terminal Wenner´s principle), and Spurious voltage according
to IEC 61557-5 |
| OPERATION FREQUENCY
|
During R measurement operators should
select the following test frequencies: 270 Hz ± 1 Hz or 1470
Hz ± 1 Hz |
| VOLTMETER |
In the voltmeter function, the equipment
operates as a CA conventional voltmeter, making it possible
to measure voltages generated by parasitic currents. |
| MEASUREMENT RANGES
|
Resistance: 0 - 20kO (autoranging)
Resistivity: 0 - 50kOm (autoranging) Voltage: 0 - 60V~ |
| ACCURACY |
Resistance and Resistivity measurements:
± (2% of the measured value ± 2 digits) Voltage measurement:
± (3% of the measured value ± 2 digits) |
| READING RESOLUTION
|
0.01Ohm in the resistance measurement.
0.01Ohm in the resistivity measurement. 0.1V in the voltage
measurement. |
| OUTPUT CURRENT
|
The short-circuit current is limited
to less than 3.5mA r.m.s. (according the IEC 61557-5 - 4.5 )
|
| IMMUNITY TO SPURIOUS
VOLTAGE INTERFERENCE |
During the R measurement, it allows
for the presence of spurious voltage up to 7V~. |
| EARTH RESISTANCE
OF AUXILIARY RODS |
In the R measurement it allows Raux
up to 50kOhm with error < 30% |
| SERIAL DATA OUTPUT
|
RS-232 @ 4800 bps. Suitable for data
collection in an external serial printer, computer or data-logger. |
| BUILT-IN PRINTER
(OPTIONAL) |
For a printed register document of
measured values |
| POWER SUPPLY |
By means of an internal rechargeable
battery, 12V 2.3Ah. |
| BATTERY CHARGER
|
A smart, microprocessor-controlled,
circuit that adjusts the battery charge to the optimised parameters
in order to ensure highest service life. It is supplied by means
of an external power supply for 95-240V 50-60Hz (provided with
the equipment). |
| SAFETY CLASS |
It meets the requirements of IEC
61010-1/1990, IEC 61010, 1/1992 amendment 2 |
| E.M.C |
In accordance with IEC 61326-1 |
| ELECTROSTATIC IMMUNITY
|
In accordance with IEC 1000-4-2 |
| ELECTRO MAGNETIC
IRRADIATION IMMUNITY |
In accordance with IEC 61000-4-3
|
| ENVIRONMENTAL PROTECTION
|
IP54 with closed lid. |
| ALTITUDE MAXIMUM
|
3000m |
| OPERATION TEMPERATURE
|
-10°C to 50°C |
| STORAGE TEMPERATURE
|
-25°C to 65°C |
| HUMIDITY |
95% RH (without condensation) |
| SIZE |
274 X 250 X 124 mm |
| EQUIPMENT WEIGHT
|
Approximately 3.0kg (without accessories)
|
| INCLUDED ACCESSORIES |
• Four steel rods. • Battery charger
power supply, 95 to 240V input voltage. • One 40 meters cable
in red colour. • Two 20 meters cable in blue and green colour.
• One 5 meters cable in black colour. • One 5 meters cable to
connect to the grounding system to be measured. • Canvas bag.
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