ABEM Terrameter LS
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If the external power source does not exist it switches to the internal battery.
However, the following start up scenario should be looked out for:
1. If the external battery has a voltage that is just over the OK limit the instrument
will proceed to the stage where the more power draining display lights up.
2. The voltage on the already weak battery will now drop below an acceptable level.
3. The instrument then goes into a resting state.
4. The external battery will now recover to a higher voltage level.
5. The instrument sees enough voltage to restart the start up sequence.
6. The display lights up with a following drop in voltage and a forced resting state.
This sequence can continue repeatedly for a long time. In case this happens the
immediate action is to disconnect the battery and have it replaced or charged. Always
use a good and newly charged battery for your survey.
After the transmitter has started the power supply voltage is allowed to temporarily
drop to 9V. The instrument may temporary indicate low battery voltage while
transmitting high current into the ground.
2.6
Operating in High Temperature Situations
Every individual Terrameter LS is operated for at least one hour in a heat chamber
during the delivery test. During normal operating condition a thermal fuse will turn
off the instrument if overheating occurs. This is to prevent damage and it will of
course halt the measuring process.
Some precautions to avoid overheating:
•
Protect the instrument from direct sunlight. Keep it in the shade, that is use a
parasol or similar if needed.
•
Do not operate the instrument in small closed spaces, like for example transport
boxes, where air cannot circulate freely. Especially the power panel must have
good ventilation.
2.7
Operating in a Thunderstorm
If a thunderstorm should come up while out in the field with the instrument then
remember to first stop a possibly ongoing measuring process and then disconnect the
cables from the terminals without touching any bare conductors. Never leave the
cables connected to the Terrameter LS overnight unless they are equipped with
adequate lightning protection since a thunderstorm may occur.
Never take measurements during a thunderstorm!
Summary of Contents for Terrameter LS
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