CS-770 GB
3
BATTERY CHECK
As a guide to battery condition a battery check is provided (E). To check batteries, simply depress
button (E) (N.B. machine must be switched on) and note the position of the meter needle, the further
the needle is to the right of the "Change Battery" mark the better the condition of the batteries.
TUNING YOUR DETECTOR
First switch on knob (A) and whilst depressing Auto Tune Button (C) turn clockwise until a faint
noise is heard (and the meter needle centres). Then release Auto Tune Button. The best optimum
tuning point is where the sound can just be heard if the machine is operated on a silent setting of
where the noise is too loud sensitivity will be lost.
N.B. Before tuning machine ensure no metal objects are in the vicinity.
RE-TUNING
Should the detector go out of tune for any reason, e.g., changes in temperature or ground conditions,
encounters with large metal objects or an alteration of the discriminate control, simply depress the
auto tune button and the detector will return to the pre-selected optimum tuning point.
DISCRIMINATION
The CS-770 has a variable discrimination control which allows the operator to choose from any
setting between all metal detection (Reject 0) to iron and silver paper rejection (Reject 10).
To adjust the Discriminate Level Control (B) depress the Auto Tune Button turn discriminate level
control to the desired level and release Auto Tune Button.
Discrimination of a target object is indicated by a reduction in signal strength and by the meter
moving to the left. For example, with the reject setting at 5 an iron nail will give a negative reaction
(reduction in sound, meter moves to the left) whereas on a coin there will be a positive reaction (an
increase in sound and a meter movement to the right).
All metal detector discriminations suffer from anomalies when objects are close to the search head.
This is indicated by receiving a positive and negative reaction from the same object. If this occurs
simply raise the detector about 3" re-tune and scan again.
