Battery Powered Earth Tester with Measurement of Soil Resistivity

Compact, handy, menu-driven soil resistivity measuring instrument for 3 and 4-wire connection with continuous monitoring of interference voltage and earth electrode and probe resistance with indication if allowable limit values are exceeded.

Complete indication of all necessary values at a large dot matrix display, or warning with 4 LEDs. Easily comprehensible, simple operation with 4 keys.

Applications

The GEOHM C is a compact instrument for the measurement of ground resistance in electrical systems in accordance with:

• DIN VDE 0100- Installation of power systems with nominal voltages of up to 1000 V
• DIN VDE 0141- Grounding in AC systems with nominal voltages of greater than 1 kV
• DIN VDE 0800 Installation and operation of telecommunications systems including data processing systems: equipotential bonding and grounding

Testing of lightning protection systems in accordance with DIN VDE 0185
The instrument is also capable of determining soil resistivity which is essential in calculating dimensions for grounding systems. It can thus be taken advantage of for simple, geological surveys, and for the planning of grounding systems.
Beyond this, ohmic resistance can be measured at both solid and liquid conductors, as well as internal resistance at conductive elements, as long as these are capacitance and induction-free.

Special Functions:

• Hold function: The measurement value is frozen at the display after the measurement key is released.
• Storage of measurement values to memory
• Data interface for the transmission of measurement values and for software updates
• Convenient report generating software, can be expanded into a comprehensive database

Display
The LCD consists of a backlit dot matrix display at which menus, setup options, measuring results and online help can be viewed. Various display languages can be selected depending upon the country in which the instrument is used.

Operation
The instrument is easy to operate. A multifunction key allows for one-hand operation for menu selections and the initialization of measurements. Basic functions and sub-functions are selected with the help of four softkeys.
The instrument functions in accordance with the ammetervoltmeter principle, and thus requires no balancing. Automatic measuring range selection, limit value monitoring and direct selection of 3 or 4-wire measurement assure easy operation as well.

Battery Monitoring and Self-Test
A battery symbol with five segments ranging from depleted to fully charged continuously indicates the charging level of the batteries in the main menu.
Automatic shutdown ensures if the batteries are fully depleted, and the instrument includes an integrated charge monitoring circuit for safe charging of rechargeable NiMH or NiCd batteries. During the self-test, a series of test patterns can be displayed one after the other, and indicator LEDs and relays are tested.

Rugged Housing for Harsh Operating Conditions
Soft plastic jacketing protects the instrument against damage due to impact and dropping.

Data Interface
Measurement data can be uploaded to a PC via the integrated IRDA interface for processing and archiving, or for the generation of official reports

Software Updates
The test instrument can always be kept current thanks to device software updates via the IRDA interface. Software updates are performed during the course of re-calibration by our service department, or by the user himself.