| Earth Resistance Ranges |
0.001 – 1.999Ω |
| 0.01 – 19.99Ω |
| 0.1 – 199.9Ω |
| 1 - 1999Ω |
| Accuracy (20°C) |
±2% of reading ±2 digits |
| Temperature Effect |
±0.1% per °C |
| Working Temperature Range |
-15°C to +50°C |
| Storage Temperature Range |
-30°C to +7C°C |
| Humidity |
95% A.H. combined with cyclic temperature changes of25°C to 40°C (BS2011: Part2.1, Db: 1977, IEC68-2-30: Test Db: 1969) |
| Test Frequency |
128Hz reversing d.c. |
| Interference |
Steady interference voltages at d.c., 50 or 60Hz will be rejected. The effect of transient noise is minimised by a switched filter. |
Maximum interference:-
2Ω range low current ± 5V peak
2Ω range normal current ± 10V peak
all other ranges and currents ± 20V peak |
| Filter Time Constant |
Normal (filter switch 'OUT') 1 second |
| Long (filter switch 'IN') 10 seconds |
| Test Current |
High 40mA |
| Normal 10mA |
| Low 5mA |
| Maximum Current Spike Resistance |
The maximum permissible resistance of the current loop depends on the test current selected:-
High current: 800Ω
Normal current: 3.5kΩ
Low current: 7.5kΩ |
| Maximum Potential Spike Resistance |
The input impedance between the potential terminals is - 2MΩ. A maximum potential loop resistance of·10kΩ will give an additional error of 0,5%. |
| Output Voltage |
50V maximum from the Cl, C2 terminals |
| Display |
3% digit l.c.d. maximum reading 1999 |