15
to 20 gamma) then the fish needs to be tuned or the electrical noise in the area is just to noisy to operate
in the G1 position (noise is the most likely problem).
c) The number in the readout will slowly drift (up or down) while the sensor coils and fluid temperature
stabilize.
We are now in the most sensitivity position (G1). Normal operation is in this position.
6. To insure the unit is properly working, have a second person approach the front section (sensor) with a
gallon size steel can.
When the can is within 10-12’ of the head of the fish the system should start seeing the can (the numbers
in the readout should start down). As the can is moved closer to the head the numbers should continue to
go down.
Note: When the unit is cycling the frequency displayed in the readout should be “steady”. The actual frequency that is
displayed may be somewhat different from the map. It is important is that the READOUT is steady so when a change
does occur you know a metal object caused it. Once the readout is steady, compare the reading to the reading the
tuning switches was set for. If the actual reading is different by more than 500 gammas, then change the tuning to
match the displayed readout (see page 15 for tuning).
If you are using the unit on land and in a noisy area (RF noise from CB’s, radio stations, power generating plants, etc.)
the READOUT may jump around somewhat. Mags always run quieter in the water - no outside interference.
Cycle Time Switch:
The Cycle Time Switch is used to change how often a reading is taken. The 2 second polarization time ( the same 2
second length is the same in all positions) is a high current drain on the battery. A battery will last 3-4 times longer in
the 10 second cycle time position than in the 2 second cycle time position. When searching for small targets ( cannon
balls, ship fittings, etc) the 2 second cycle time should be used (so you do not swim or walk past the target). When
searching for very large targets, the 10 second cycle time can be used.
7. Change the cycle time switch to 5 seconds and then to 10 seconds. The only difference in the readout
between the three Cycle Time settings is how often (readout goes blank) a reading is taken.
Audio Adjust:
The audio output tracks the digital readout. When the gamma number increases, the frequency of the audio in-
creases. When the gamma number decreases the frequency of the audio decreases. The Audio Adjustment control
allows the operator to adjust the frequency to a comfortably level for the gamma readout being displayed. If you are
unable to adjust the frequency to the desired frequency the scaling is out of range. When the Audio Adjust control is
turned completely CCW the microprocessor re-scales the output frequency to cover your gamma readings currently
displayed.
8. Screw the earphone into the Earphone jack.
9. Turn the Audio Adjust knob completely CCW, and then to mid-range (12 o’clock).
10. Have a second person approach the front section (sensor) with a gallon size steel can. Watch the readout
while you listen to the audio. The audio frequency should shift as the readout changes.
NOTE: If any of the above sequence does not take place, see TROUBLESHOOTING in the back of this manual or call
the factory 800-822-4744 or 508-822-7330.
DIVER MAG 1 OPERATION (continued):
