Amprobe TELARIS Série Mode D'emploi page 20

• 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 I M " 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:
Type of the
Ground
marshy
soil/swamp
arable land/clay
humid sandy soil
dry sandy soil
stony soil
concrete1:5
References to evaluate measurement results (in compliance with DIN VDE 0413
Table 2:
Required max. Permissable Resistance
0.3 Ω
0.4 Ω
0.5 Ω
0.6 Ω
0.7 Ω
0.8 Ω
0.9 Ω
1.0 Ω
2. 0 Ω
3.0 Ω
4.0 Ω
5.0 Ω
Example for Table 2:
Earth Resistance
Bar Ground Connection
3m deep 5m deep
10 Ω
5 Ω
33 Ω 17 Ω
66 Ω 33 Ω
330 Ω 165 Ω
1000 Ω 500 Ω
Required max. permissable resistance 1Ω.
Maximum displayed test value on EARTH-TEST 0,84 Ω.
Earth Resistance
Flat Ground Connection
5m length 10m length
Maximum Displayed Test Value
0.18 Ω
0.28 Ω
0.37 Ω
0.46 Ω
0.56 Ω
0.65 Ω
0.75 Ω
0.84 Ω
1.84 Ω
2.79 Ω
3.73 Ω
4.67 Ω
18
12 Ω 6 Ω
40 Ω 20 Ω
80 Ω 40 Ω
400 Ω 200 Ω
1200 Ω 60 Ω
160 Ω 80 Ω