SEW 1120ER Earth Resistance Tester

Capable of measuring earth voltge.

2mA measuring current permits earth resistance to test without tripping earth leakage current breakers in the circuit.
Test leads are supplied as standard accessories for simplified two-wire measuring system.
0 Ohm adjustment.
Data hold function.
Battery operated.
Battery life indicator.
Standard accessories for 3T and 2T.
Designed to met IEC/ EN 61010-1, IEC 615575-5 CAT III 200V.
Calibration performed with supplied test leads.
The 1120 ER is a " professional instrument " . The instrument is suitable for the testing of single earth electrodes such as lightning conductors and other small earthing system. The resistance of conductors such as continuity and conduit coupling joints can also be measured. Two-terminal operation measurement, which reduces the accuracy, can also be done by shorting P and C terminals. Earth resistance can be measured directly from 0.01 Ohms up to 1999 Ohms.

The reading is displayed on a large, easy-to-read digital display. It has a zero 0 ohm adjustment setting that is controlled by a dial feature. > The 1120 ER makes meaureents by passing a constant current through the device under test ( generally a conductor or low resistance) and measuring the voltage across it. The earth resistance is then calculated by Ohm' s law. It has an advanced circuit design that permits the instrument to operate with the minimum influence from earth voltage and earth resistance of the auxiliary spikes. This superb instrument is powered by 8 x 1.5 folt manganese-alkaline AA batteries. The calibration of the instrument is performed with the included test leads.

Therefore, when using the supplied test leds, the accuracy does not suffer of the three-terminal method of measurement fro the most common applications. The test frequency of 820Hz has been chosed to avoid stray currents at power frequencies and their harmonics. However, the 1120 ER has a built-in filter to reject unwanted signals. The batteries are constantly being checked while in use. The case is ideal for outdoor work. with the 1120 ER can be used by the electrical contractor or maintenance engineer to check the effectiveness of thir type of earth electrode systems.

SPECIFICATIONS: 

Measuring Ranges
Earth Resistance : 0-20 Ohm/ 0-200 Ohm/ 0-2000 Ohm

Earth Voltage : 0-200V AC ( 40-500Hz) 

Accuracy
Earth Resistance : + / - ( 2% rdg+ 2dgt) or + / - 0.1 Ohm, which is greater

Earth Voltage : + / - ( 1% rdg+ 2dgt) 

Earth Resistance Resolution
0-20 Ohm ( 0.01 Ohm) 
0-200 Ohm ( 0.1 Ohm) 
0-2000 Ohm ( 1 Ohm) 

Measuring System
Earth Resistance by constant current inverter 820 Hz approx. 2mA

Display
LCD 3-1/ 2 digit ( 2000 counts) 

Open Circuit Indication
LED will be unlit

Low Battery Indication
symbol appears on the display

Data Hold Indication
symbol appears on the display

Over Range Idication
" 1 " ( MSD) 

Power Source
1.5V SUM-3 ( AA) x 8 or equivalent

Dimensions
175( L) x 85( W) x 75( D) mm

Weight
Approx. 600g ( battery included) 

Accessories
Test leads ( AL-36 : red-15m, yellow-10m, green-5m) 

Auxiliary earth spikes
Simplified measurement probe
Shoulder belt, instruction manual, batteries