Amprobe Telaris-Earth-Test Earth-Resistance-Tester - Manual (Page 20)

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• After the measurement, selection can be made between display of earth resitance (RE),
auxillary resistance (RS) and measurement current (IM) by using key “Display“ (8),
depending on the measurement result.
• The connection sequence must be respected. Otherwise the instrument will not be able to
carry out the measurement and indicates an error message:
• the display "Probe" indicates a connection error of S, E (interruptions, exchange
also with H or E)
• the "Limit IM" display indicates an interruption of the H connection.
• The procedure is carried out a different locations and at respectively varying distances "a".
Thus, the composition of the soil for the desired area is examined. Here, a measurement
at larger distances "a" gives more details about the specific earth resistance in deeper
grounds.
Table 1:
References to evaluate measurement results (in compliance with DIN VDE 0413
Table 2:
Example for Table 2: Required max. permissable resistance 1
Ω.
Maximum displayed test value on EARTH-TEST 0,84
Ω.
Type of the
Ground Earth Resistance
Bar Ground Connection Earth Resistance
Flat Ground Connection
3m deep 5m deep 5m length 10m length
marshy
soil/swamp
10
Ω 5 Ω
12 Ω 6 Ω
arable land/clay 33
Ω 17 Ω
40
Ω 20 Ω
humid sandy soil 66 Ω 33 Ω 80 Ω 40 Ω
dry sandy soil 330
Ω 165 Ω
400
Ω 200 Ω
stony soil 1000 Ω 500 Ω 1200 Ω 60 Ω
concrete1:5 160
Ω 80 Ω
Required max. Permissable Resistance Maximum Displayed Test Value
0.3
Ω
0.18
Ω
0.4
Ω
0.28
Ω
0.5 Ω 0.37 Ω
0.6
Ω
0.46
Ω
0.7
Ω
0.56
Ω
0.8
Ω
0.65
Ω
0.9 Ω 0.75 Ω
1.0
Ω
0.84
Ω
2. 0
Ω
1.84
Ω
3.0
Ω
2.79
Ω
4.0 Ω 3.73 Ω
5.0 Ω 4.67 Ω
PAEB30872261:Layout 1 12.12.2007 12:06 Uhr Seite 18