Earth/Ground Tester
Specifications
Selective Measurement of the Earthing Resistance (REA)
Measuring method: | Current and voltage measurement with probe as per | |||||
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| branch with additional current transformer (patent ap- | |||
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| plied for). |
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Open circuit volt- | 20 / 48 V AC |
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age: |
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Short circuit current: | 250 mA AC |
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Measuring fre- |
| 94, 105, 111, 128 Hz selected manually or automati- | ||||
quency: |
| cally (AFC), 55 Hz (R*) |
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Noise rejection: | 120 dB (16 2/3 , 50 , 60 , 400 Hz) |
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Max. overload: |
| max. Urms = 250 V (measurement will not be started) | ||||
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Measuring |
| Display Range | Resolution | Intrinsic | Operating | |
Range |
| Error * | Error * | |||
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| 0.001...2.999 Ω | 0.001 Ω |
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| 3.00...29.99 Ω | 0.01 Ω |
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0.020 Ω... |
| 30.0...299.9 Ω | 0.1 Ω | ± (7 % of | ± (10% of m.v. | |
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| m.v. +2 | +5 digit) |
30 kΩ |
| 0.300...2.999 kΩ | 1 Ω | |||
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| 3.00...29.99 kΩ | 10 Ω |
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* With recommended current clamps / transformers.
Additonal error because of probe- and auxiliary earth typ.electrode resis- tance:
Measuring error of RH and RS:
Measuring time:
RH (RS + 2000Ω) ⋅1.25 ⋅10−6 % + 5digits
RETOTAL
typ.of 10% of RETOTAL + RS + RH
typ. 8 sec. with a fixed frequency 30 sec.max. with AFC and complete cycle of all measuring frequencies
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