Checking The Battery Status; Description Of Functions; Operating Principle - Renkforce MD 200 Bedienungsanleitung

• Insert two 9V block batteries (not included) into the dual battery compartment (18) in the correct polarity (observe
the positive/+ and negative/- markings).
• Slide the battery compartment covers back into place and ensure that the locking mechanisms click into place.
To replace the batteries, remove the old batteries and follow the steps above.
• The battery life with high-quality, fully charged alkaline batteries is approximately 24 hours.
b) Checking the battery status
You can check the battery status of both battery compartments. We recommend that you check the status of the single
and dual battery compartments before each use. Follow the steps below:
• Move the MODE dial (16) to "VLF". The battery status cannot be checked in other modes.
• Slide the battery test switch (14) to "B1" to test the status of the dual battery unit.
• Slide the battery test switch (14) to "B2" to test the status of the single battery unit.
• The pointer on the analogue display (21) indicates the battery status. If the pointer points at the green area marked
"BATT", this indicates that there is sufficient battery power remaining. Replace the battery/batteries if the pointer is
not pointing at the green area.
• Slide the battery test switch (14) to "Operate" to switch back to metal detection mode. You can then start to search
for metals.
Check the battery status in the event of a malfunction, e.g. if the metal detector doesn't switch on, if you
can't adjust the settings, if the volume is too low or if the metal detector doesn't respond properly.

10. Description of functions

a) Operating principle
This product uses VLF (very low frequency) technology. VLF metal detectors consist of a transmitter coil, a receiver
coil and circuits with microprocessors that process the signals. The outermost coil on the transmitter coil functions
as the transmitter. An alternating current with a frequency of 20 kHz is transmitted through this coil. This generates a
magnetic field along the vertical axis to the ground. The magnetic field induces a current in metal objects under the
ground. This then generates an opposite magnetic field in the receiver coil, which is located inside the transmitter coil.
The inducing and induced currents are delayed due to inductance. This phase shift of the currents in the transmitter
and receiver coil enables the metal detector to identify the type of metal.
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