Amprobe GP-2A Manual De Uso página 14

Fig. 4: Two-wire earth resistance measurement from the panel board
1. Turn on the instrument pressing the ON/OFF key
2. Pressing right/left arrow keys , select MOD, then pressing up/down arrow
keys , select 2W option
3. A screen similar to the one below appears where the input interfering voltage value of
the instrument is displayed
4. Connect the blue, red, green and black cables to the corresponding instrument's input
terminals H, S, ES, E then adding crocodiles if necessary
5. Extend, if necessary, the blue and red measuring cables separately using cables with
proper section. Adding any extension does not require calibration and does not affect
the measured earth resistance value
6. Connect crocodiles to the auxiliary rods and to the installation under test (see Fig. 3 and
Fig. 4)
7. Press GO key, the instrument starts carrying out measurement
8. While the instrument is measuring a screen similar to the one below appears where the
instrument's input interfering voltage value is displayed. When the message
is displayed do not disconnect or touch the test leads
(Input interfering voltage value)
(Input interfering voltage value)
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