MRU-200-GPS OPERATING MANUAL Version 1.06
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Note:
- Enabling GPS during resistance (resistivity) measurement is indicated by the
icon in the left up-
per corner of the display. Searching GPS signal is indicated by the blinking icon. The icon stops blink-
ing and is displayed continuously, when the satellite signal is found.
2.3 Measurement settings
Using and buttons highlight
the required position.
Press
ENTER
to select the option.
2.3.1 Mains frequency
Before making any ground resistance measurements, the local mains frequency must be set in
the meter since it is the source of potential interference with resistance measurements due to stray
electrical fields. The meter will pick the appropriate frequency of its measurement signal to guarantee
the optimum interference filtering. The meter is adapted for filtering of interference at 16 2/3Hz, 50Hz,
60Hz and 400Hz. The meter can automatically select the filtering parameter (selection of the mains
frequency = AUTO), by running a series of measurements to determine the level of local interference
prior to performing the earth resistance measurement. The AUTO function is active if the interference
voltage is ≥ 1V. Otherwise the meter adopts the last frequency value selected from the MENU.
