GSM-8

Proton Magnetometer Features

• 1 gamma resolution and accuracy, 0.5 gamma optional.
• Worldwide range.
• High gradient tolerance
• Excellent visibility of the display in any ambient light.
• Display stays active between readings.
• External trigger and digital output standard, analog output optional.
• Rugged, all-metal construction.
• No-lock indication.
• Polarize indication.
• Shoulder/belt-strap for easy carrying.
• Sensor backpack for hands-free operation optional.
• Nonmagnetic battery pack optional.
• Custom modifications available.

General

The GSM-8 proton magnetometer is a lightweight one gamma proton precession magnetometer designed primarily for hand-held and base station operations, but adaptable for other earth magnetic field measurements like airborne/marine surveys, pipe and cable detection, tracking, etc.

The instrument's power consumption, size and weight have been minimized to make it one of the world's lightest and most compact one gamma proton precession magnetometers.

Rugged, wide temperature range liquid crystal display allows for easy reading in bright sunlight. The all metal construction ensures long life even in the roughest of field condihons.

Flexible design of electronics enables this magnetometer to have a wide selection of cycling speeds and other necessary features for almost universal earth field measurements. The complete self-test feature ensures reliable operation and early warning of instrument malfunction due to interferences such as excessive field gradient, electromagnetic radiation, or internal breakdown.

Specifications

Operating Modes

• Manual Push Button, new reading every 1.86 seconds, display active between readings
• Cycling, push button initiated, 1.85 second period
• Self-test cycle, push button controlled, 7 second period
• Output: Visual: 5 digit lcm high Liquid Crystal Display, visible in any ambient light Digital: Multiplied precession frequency and gating pulse Analog: 0-99 gamma (optional)

Power Source

• Internal: 12V 0.75 Ah NiCd rechargeable battery, 3,000 readings from fully charged battery
• External: 12-18V

Dimensions

• Console: 15x 8x 15cm
• Sensor: 14 x 7cm diameter
• Staff: 175cm extended, 53cm collapsed or sectional 45cm each section
• Resolution: 1 gamma or 0.5 gamma optional
• Accuracy: + 1 gamma over operating range
• Range: 20,000 - 100,000 gamma in 23 overlapping steps
• Gradient Tolerance Up to 5000 gama/meter
• External Trigger: Permits externally triggered cycling with periods longer than
• 1.85 seconds (cycling faster than once per second optional)
• Power Requirements: 10-18V DC 8Ws per reading
• Battery Charger Input: 120/220V
• 50/60Hz, Output 75mA DC constant current
• Operating Temperature: -40 to +55 C°
• Weight: 2.7kg complete, 2.3kg in backpack mode

Standard Components

GSM-8 magnetometer console, batteries, carrying harness, sensor with cable, staff (collapsible or sectional), and instruction manual.

Ordering Information

Description		Order Number
GSM-8 Proton magnetometer		350-170-0000
GSM-8BA Airbome magnetometer		350-170-0003
GSM-8M Marine magnetometer		350-170-0012
Weak Link 8 Bouy (8M)		350-170-0015