Amprobe GP-2A Manual De Uso página 17

then pressing the arrow keys , set the desired measuring unit (m or ft)
6. Connect the blue, red, green and black cables to the corresponding instrument's input
terminals H, S, ES, E then adding crocodiles if necessary
7. 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 ground resistivity value
8. Drive the auxiliary rods into the ground placing them on a line at a mutual distance
equal to that selected on the instrument. Setting a distance other than the actual
distance between the earth rods may affect the measurement (§11.3)
9. Connect crocodiles to the auxiliary rods (see Fig. 5)
10. Press GO key, the instrument starts carrying out measurement
11. While the instrument is measuring a screen similar to the one below appears where the
instrument's input interfering voltage value and the distance set between auxiliary rods
are displayed. When the messageis
test leads
�CAUTION
When starting measurement the input interfering voltage is measured at both the volt and
ampere circuit. Should it range between 3 V and 9 V, the instrument carries out measurement
and displays the symbol � indicating the uncertainty decline of the measurement (§ 9.1)
12. When the test is over, should the ground resistivity value be lower than the full scale,
the instrument emits a double tone indicating the positive outcome of the test and
displays the resistivity measurement as well as the interfering voltage value at the time
of measuring
(Measuring unit selected)
displayed do not disconnect or touch the
(Value of input interfering voltage and rods' distance set)
(Measurement of ground resistivity)
(Value of input interfering voltage and rods' distance set)
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