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The Geohm C is a battery powered earth resistance measuring instrument that is ideal for the measurement of soil resistivity. It is a compact, handy, and menu-driven soil resistivity measuring instrument for 3 and 4-wire connections. The tester includes continuous monitoring of interference voltage with indication if allowable limit values are exceeded. All values are available on a large LCD display, and operation is easy with the use of 4 keys.
Includes
Reference Conditions
| Battery Voltage Ambient Temperature Relative Humidity | 5.5 V ± 1% + 23 °C ± 2 K 40 … 60% |
Nominal Ranges of Use
| Temperature Range Battery Voltage Line Frequency Line Voltage Waveshape | 0 °C … + 40 °C 4.5 … 6.5 V 50 Hz ±0.2 Hz sine (deviation between RMS and rectified value < 1%) |
Nominal Conditions of Use
| Series Mode Interference Voltage Additional Error caused by Probe and Auxiliary Earth Electrode Resistance Max. Probe Resistance Max. Auxiliary Earth Electrode Resistance Max. Earth and Auxiliary Earth Electrode Resistance | < 3 V AC DC < 5% of (RE + RA + RP) < 70 kΩ < 50 kΩ ≤ 50 kΩ |
Ambient Conditions
| Operating Temperature Storage Temperature Relative Humidity Elevation | –10 ... + 50 °C –20 ... + 60 °C (without batteries) max. 75%, no condensation allowed max. 2000 m |
Power Supply
| Batteries Battery Voltage Battery Service Life Rechargeable Batteries Battery Charger (not included) Charging Voltage Charging Time | 4 ea. 1.5 V C-size (4 x C-Size) (alcaline-manganese per IEC LR14) 4.6 … 6.5 V 30 h or 1000 measurements at RE (with 10 s on-time, each measurement performed until the instrument switches off automatically, without display illumination) NiCd or NiMH NA 102 (Article No. Z501N), 3.5 mm jack plug 9 V approx. 9 hours |
As a rule, fewer measurements can be performed with
rechargeable batteries due to their limited charging capacity.
Electrical Safety
| Safety Class Operating Voltage Test Voltage Measuring Category Pollution Degree Fuse | II per IEC 61010-1 250 V 2.3 kV 250 V CAT II 2 F0.1H250V |
Data Interface
| Type Format Range | infrared interface (SIR/IrDa) bidirectional, half-duplex 9600 baud, 1 start bit, 1 stop bit, 8 data bits, no parity, no handshake max. 10 cm recommended distance: < 4 cm |
Mechanical Design
| Display Dimensions Weight Protection | multiple dot matrix display, 128 x 64 pixels (65 mm x 38 mm), illuminated 275 mm x 140 mm x 65 mm approx. 1.2 kg with batteries housing: IP 54 per EN 60529 with pressure compensating diaphragm of microporous ePTFE, non-ageing, 8 mm dia. in battery compartment lid |
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- Measurement of earth resistance for 3 and 4-wire methods, with physical considerations of the potential gradient area as related to dissipation resistance of grounding systems of various sizes. Measurement of soil resistivity with geologic analysis and calculation of dissipation resistance.