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Summary of Contents for JW Fishers DIVER MAG 1
- Page 1 DIVER MAG 1 MARINE MAGNETOMETER REV 709 OPERATION AND MAINTENANCE MANUAL...
- Page 2 DIVER MAG 1 MARINE MAGNETOMETER OPERATION MAINTENANCE MANUAL JW FISHERS MFG INC 1953 COUNTY ST. E. TAUNTON, MA 02718 USA (508) 822-7330; (800) 822-4744; FAX (508) 880-8949 Email: jwfishers@aol.com WEB: www.jwfishers.com...
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Page 3: Table Of Contents
TABLE OF CONTENTS • DO’S AND DON’T ..........................4 • SPECIFICATIONS ..........................5 • DETECTION RANGES ........................6 • INTRODUCTION TO MAGNETOMETERS ..................7 • THEORY OF OPERATION ........................8 • SYSTEM BREAKDOWN ........................9 • OPERATION ............................. 13 • RECHARGING BATTERY ......................... 17 •... - Page 4 DO NOT • Operate the Diver Mag 1 until liquid (charcoal lighter fluid) has been added to the sensor housing; damage can occur to the sensor coils (see page 13). • Do not let Diver Mag 1 sit in hot sun for prolonged periods.
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Page 5: Specifications
DIVER MAG 1 SPECIFICATIONS DIMENSIONS/WEIGHTS: • Diver Mag 1 ..........52’L x 6”Dia........... 37 lbs. • Carrying case ........59”L x 18”D x 22”H ........50 lbs. • Total Shipping ........59”L x 18”D x 22”H ........87 lbs. MATERIALS/COLOR: •... -
Page 6: Detection Ranges
Lg. ship ......... 2000 gamma at 100' ......... 2 gamma at 1500' The above chart shows the Diver Mag 1 detection range for different targets. The Diver Mag 1 has a sensitivity of one gamma; that is, it will detect a change of one gamma. Each one gamma change will change the digital readout one digit. -
Page 7: Introduction To Magnetometers
120 vac (220 vac optional). The DIVER MAG 1 was designed for underwater use, but can be used on land with the same 1 gamma sensitivity. A land handle grip is provided for carrying the unit on land. The unit is quite heavy (35 lbs), so a small wheeled cart is recommended for prolonged land use (use nonferrous metals in cart). -
Page 8: Theory Of Operation
THEORY OF OPERATION The sensor, located in a housing in the front of the Diver Mag 1 , contains charcoal lighter fluid (ships empty from factory, see page 13) which is rich in protons (nuclei of hydrogen atoms). The protons act like small bar magnets and align themselves parallel to the earth’s magnetic field (like a compass). -
Page 9: System Breakdown
The Diver Mag 1 must be capable of being tuned from 24,000 to 61,000 gammas (see world map). To optimize tuning, a ten position binary switch (100 different combinations) is used to cover the full range of gammas. Each switch position covers a large area, and the position that covers your area has already been selected at the factory (this will be explained later). -
Page 10: Operation
DIVER MAG 1 CONTROL PANEL LOW BATT. LEAK DIVER MAG 1 KNOB (FOR FACEPLATE REMOVAL) CYCLE TIME SENSITIVITY AUDIO ADJUST The Control Panel contains the following switches and indicators for overall control of the system: CYCLE TIME SWITCH - A four position switch that turns the unit on and selects the cycle time. - Page 11 AUDIO ADJUST - The Diver Mag 1 has both a LED readout and a Audio output (underwater earphones). When a target is detected the frequency of the audio shifts up or down in conjunction with LED readout. The audio adjustment control allows the operator to adjust the frequency (when no target is detected) to a comfortable frequency level.
- Page 12 It cables directly into the rear of the Diver Mag 1 electronics housing. This battery is identical to the battery that is inside of the Diver Mag 1. The spare battery pack is disconnected from the Diver Mag 1 for recharging of either batteries.
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Page 13: Filling The Sensor Housing With Fluid
(once o-ring makes contact, a 1/4 turn will seal the housing. Use a paper towel to clean up any left over fluid around the bolt heads. Funnel 9. Reinstall the fish nose cone. Diver Mag 1 - Nose End View Vent hole plug Insert small funnel in fill hole and fill with charcoal lighter fluid Charcoal Lighter Fluid..or..Lighter Fluid... - Page 14 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).
- Page 15 DIVER MAG 1 OPERATION (continued): 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.
- Page 16 The Diver Mag 1 is tuned by a switch on the amplifier board which is located in the electronics housing in the rear of the fish. The amplifier board, microprocessor board, and control panel are all bolted together. To gain access to the amplifier board, the control panel must be pulled out from the rear of the electronics housing.
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Page 17: Tuning
INSERT DIVER MAG 1 FISH TUNING CHART... - Page 18 To add sheet lead to the front end of the Diver Mag 1, remove the four screws that hold the nose cone in-place (mark the top hole of the nose cone for reassembly) and place the piece of sheet lead between the rear of the nose cone and body of the Diver Mag 1 (no need to anchor the lead in-place).
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Page 19: Troubleshooting
To contact the factory: Phone (800) 822-7330 or (508) 822-7330; Fax (508) 880-8949; email jwfishers@aol.com Web site www.jwfishers.com ; Mail to JW Fishers Mfg Inc, 1953 County St, E. Taunton, MA 02718 Problem 1- Audio pulsates on and off and five dashes (- - - - -) appear in the readout. -
Page 20: Warranty
LIMITED WARRANTY The Warranty on the Diver Mag 1 is for two years from date of purchase and is limited to the electronic portion of the unit. The Warranty does not include broken, damaged, or lost equipment. Should service be required, contact us explaining the nature of the problem.
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