14
OPERATION AND TUNING
Do not operate the unit until the sensor housing is filled with charcoal lighter fluid (pg 13)
Operation of the Diver Mag 1 is extremely simple. It will operate month after month without any adjustments once the
unit is tuned. Once you have tuned for an area, if you change areas (more than 1,500 gammas), the unit should be
checked for proper tuning before going in the water (always tune the unit on land, whenever possible, before heading for
water). Generally, you would have to travel hundreds of miles (north or south) before tuning would have to be changed,
but test it on land to be sure.
Before your unit was shipped from the factory, the fish was tuned to the gamma reading shown on the map for your area.
The gamma setting is written on a tag connected to the outside of the fish. Check the map for the expected gamma
reading in your present area, and if it agrees with what is written on the tag (+or- 1,500 gamma) then there is no need to
change the tuning for your area at this time. Simply checkout the system in the field (see below).
Note: The map gamma reading is the approximate expected gamma reading. If the gamma number is off by more than
1,500 gammas, then tune the unit (page 15) before proceeding with this checkout.
DIVER MAG 1 OPERATION:
Select an area, outside the city, that is free of power lines and buildings (at least 300' away) and away from any large
metals (junk cars, dump, etc.). The unit will not work in a city, or in areas saturated with metal. The unit may not work
in a park or field that is located in a city.
1. Position the Diver Mag 1 one to two feet above the ground, but parallel to it (use two cardboard boxes — be
sure there are no metal staples in the boxes).
2. Set SENSITIVITY switch to G20 (least sensitive position).
3. Set Cycle Time to 2 sec.
When the Cycle Time switch is turned to 2 seconds, power is automatically turned on. The following sequence takes
place.
1. The microprocessor is initialized and several test cycles are made. The readout remains blank during this 10
second warm-up period.
2. After the 10 second warm-up the first reading is displayed. While the gamma reading (divided by 20) is
displayed the unit goes into polarization (for 2 seconds) getting ready to take the next reading.
3. After the two second polarization time the unit goes into read time for approximately 1/4 second. During read
time the readout goes blank. At the end of read time the readout displays the new reading.
4. The unit repeats the sequence (2 sec polarization, 1/4 sec read, 2 sec polarization, etc) until the unit is turned
off or the cycle time switch is changed.
5. The readout number should be steady (not constantly changing).
If the readout number is jumping around at this point, see the troubleshooting section and/or call the factory (800) 822-
4744.
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 6' 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.
If the readout number does not change, see the troubleshooting section and/or call the factory (800) 822-4744.
Sensitivity Switch:
7. Put the sensitivity switch in the G1 position. This is the most sensitive position, the position you would
normally like to operate in. However, due to outside electrical noise, when the unit is out of the water, you
may not be able to operate in this position. The other positions (G5, G10, and G20) are used when trying to
pinpoint a buried target that is at close range. When in the G1 position:
a) The readout is displaying gammas and the number should be approximately what the map indicates for
your area.
b) The readout will jump /- 1 or 2 due to outside noise. If the numbers jump around excessively (15
