MARTINDALE ET4500 - 9.6 Resistance to earth (ET4500 only); Standard Earth Resistance Measurement Specs

Martindale ET4000 / ET4500 Technical specifications
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9.6 Resistance to earth (ET4500 only)
9.6.1 Standard earth resistance measurement – 3-wire measurement
Measuring range to BS EN 61557-5 is 2.00  - 9999 .
Measuring range () Resolution ()
Accuracy
0.00 - 19.99 0.01
(5% of reading + 5 digits)
20.0 - 199.9 0.1
200 - 9999 1
Max. auxiliary earth electrode resistance R
C
... 100R
E
or 50 k (whichever is lower)
Max. probe resistance R
P
................................ 100R
E
or 50 k (whichever is lower)
Additional probe resistance error at R
Cmax
or R
Pmax.
(10 % of reading + 10 digits)
Additional error at 3 V voltage noise (50 Hz) ... (5 % of reading + 10 digits)
Open circuit voltage ......................................... < 30 VAC
Short circuit current .......................................... < 30 mA
Test voltage frequency .................................... 125 Hz
Test voltage shape .......................................... sine wave
Noise voltage indication threshold ................... 1 V (< 50 , worst case)
Automatic measurement of auxiliary electrode resistance and probe resistance.
Automatic measurement of voltage noise.