Amprobe ROBIN KMP7010 Panduan Pengguna - Halaman 11
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Halaman Cetak
Earth Resistance Measurement
Display Range
0.00 – 40.00Ω
0.0 – 400.0Ω
0 – 4000Ω
Test Condition
Relative Humidity: ≤75%RH
Auxiliary Earth Resistance: 500e (Accuracy ±5%)
Earth Voltage: ≤10Vac
EN 61557-5 Measurement Range: 10Ω – 4000Ω ±(2% + 3LSD), f=840Hz
Interference voltages (3V) with system frequencies of 400Hz, 60Hz, 50Hz,
16 2/3Hz or with d.c. voltage across the terminals E and S or to the earth
resistance loop would have additional operating uncertainty. The overall
operating uncertainty B% is within ± 30%
Measurement times: approx. 1400 times or more (with fresh batteries)
Precision Measurement (using standard test leads for measurement):
1. place 2 ground stakes in earth/soil. Minimum distance between earth
electrode(E), probe(S) and auxiliary earth (H) should be 5-10 M (16- 33
FT) apart, shown in Fig.2
Note: Make sure that the earth stakes are inserted in a moisturized
soil. If the soil is too dry,add water to make it moist. Inserting the earth
stakes into rock or sand area also needs to moisturize the test area
before testing.
5~10m
Auxiliary
Earth Stakes
H: auxiliary electrode
5~10m
Earthed Electrode
Under Test
S: potential electrode
±(2% Rdg +20 LSD)
±(2% Rdg +3 LSD)
±(2% Rdg +3 LSD)
Red
Yellow
Green
Fig.2
6
Accuracy
E: earth electrode