G-858BP Backpack Mag Operators Manual
99
SYSTEM SPECIFICATIONS
MAGNETOMETER / ELECTRONICS
Operating Principle: Self-oscillating split-beam
Cesium Vapor (non-radioactive CS-133).
Operating Range
: 18,000 to 95,000 nT (γ)
Operating Zones
: For highest signal-to-noise ratio, the
sensor long axis should be oriented at 45°, ±30° to the
earth’s field angle, but operation will continue through
45°, ±35°. Sensor is automatic hemisphere switching.
Sensitivity
: 90% of all readings will fall within the
following P-P envelopes:
0.03 nT at 0.2 sec cycle rate (SX=0.113nT)
0.02 nT at 0.5 sec cycle rate (SX=0.072nT)
0.01 nT at 1.0 sec cycle rate (SX=0.051nT)
Information Bandwidth
: < 0.004 nT (γ)/√Hz RMS
Heading Error
: < ± 0.5 nT (γ)
Temperature Drift
: 0.05 nT per degree C
Gradient Tolerance
: > 500 nT (γ)/inch (>20,000 nT
(γ)/meter
Cycle Rate
: Variable from 0.2 sec to 1 hr in 0.1 sec
steps or by external trigger.
Data Storage
: Non-volatile RAM with capacity for 8
hrs of Magnetometer time, event marks, location as
GPS at maximum sample rates.
Audio Output
:
1. Audio tone of earth’s field
variation, pitch and volume adjustable.
(Search)
2. Audio pulse each 1 second
(Pace metronome).
3. Alarm for loss of signal, noise in
signal (QC) or low battery.
Data I/O
: RS-232 standard bidirectional serial port,
selectable continuous real time data transmission
via RS-232 to PC. Memory dump transfer time less
than 5 min at 115Kbaud transmission rate.
Visual Output
: Micro-controller driven, 320 x 200
graphic liquid-crystal display, daylight visible with
selectable outputs for:
1. Data display: Up to 5 stacked profiles, real
time or review mode. Map of survey grid
with zoom functions.
2. All system set-up functions, e.g., memory
status, data transfer, sample time.
3. All Survey set-up functions, e.g., survey
profile number and direction, station or GPS
number,
4. Survey monitoring functions, e.g. total field,
noise level, profile number x or xy
coordinates.
Internal Clock
: Resolution of 0.1 sec, drift: < 1
sec/day
Power
: 1. 24 VDC rechargeable gel cell, 6 hrs
Magnetometer with GPS. Magnetic
effect less than 1 nT (γ) at 3 ft.
2.Internal backup battery for clock and
non-volatile RAM.
External power input 12 to 34 VDC, 1 amp on turn-
on, 600ma operating in magnetometer
mode.
Software
: Supplied as part of the basic system for
installation in the Geometrics or client-supplied PC,
and including functions for:
Operating Software:
1. Survey Modes:
a. Search
b. Simple survey, station or continuous
c. Map survey, station or continuous
d. Base station
2. Data acquisition/display:
a. Acquire and store data and survey
functions.
b. Display profiles, total field to 0.1 nT
resolution,, survey/map parameters and
diagnostics.
C. Map display showing location of all
readings.
PC Support Software:
1. Data transfer and corrections:
a. Transfer of data from the field
Magnetometer, GPS, or Base station to
the PC.
b. Diurnal correction using base station
data.
c. Processing the corrected data into ASCII
values of X-Y-Z for the magnetometer
2. Optional bundled “Surfer for Windows” by
Golden. Provides data presentation/plotting
into a contour map or 3D isomagnetic map
with Text annotation and color blends.
MECHANICAL
Sensor: 2-3/8” dia., 6-3/4” long, 12 ounces
6 cm x 15 cm, 340 g
Console
: 6” W, 3” H, 11” L, 3.5 lbs. (15 cm x 8 cm x
28 cm, 1.6 kg), attaches to harness.
Magnetic effect less than 1 nT (γ) at 3 ft
Battery
: 3” H, 5” W, 8” L, 3.5 lbs (8 cm x 13 cm x
20 cm, 1.6 kg) attaches to harness.
Backpack
specs ?
ENVIRONMENTAL
Operating Temperature: -15°C to +50°C (-13°F to
+ 122°F)
Storage Temperature
: -35°C to + 60°C (-30°F to +
140°F)
Water Tight
: To 1 ft (0.3 m) depth for 10 seconds.
Shock
: Drop 3 ft on a hard surface without damage
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