Warnings: Measure Stability And Battery Discharge - GDD Instrumentation MPP-EM2S Plus Instruction Manual

WARNINGS: Measure Stability and Battery Discharge

Measure Stability (Drift)
The MPP-EM2S+ is a useful geophysical instrument that will help you to get the information that you
need to design an appropriate geophysical survey. In order to obtain stable values (which should be
around 0) and avoid signal drift, it is highly recommended to leave the probe ON during one hour
before taking the first measurement. After one hour, you must re-initialize the probe and then, you
are ready to take measurements. To minimize the drift once you have started to take measurements,
you must initialize the probe every 1, 5, 10 or 15 minutes. By default, the option 1 minute between
every initialization is activated.
If you want to take measurements right away after turning on the probe, we suggest that you
initialize the probe every minute or, for best results, before each reading for the first 30 to 60
minutes.
This preventive procedure decreases the risk to take erroneous values that would be caused by
weather variations or by other external causes that lead to a drift of the instrument. It is therefore
very important to often re-initialize in order to maintain the «0» base value used in the calculation of
the displayed values.
Please take note that values are more stable after 20 minutes and are completely stable after 50 to 60
minutes.
Instrumentation GDD Inc. 2018-01-16 2