MAGNETOMETER/ELECTRONICS |
Operating Principle: |
Self-oscillating split-beam Cesium Vapor (non radioactive Cs133) with automatic hemisphere switching. |
Operating Range: |
17,000 nT to 100,000 nT |
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 reading will fall within the following Peak-to Peak envelopes: |
0.05 nT at 0.1 sec cycle rate
0.03 nT at 0.2 sec cycle rate
0.02 nT at 0.5 sec cycle rate
0.01 nT at 1.0 sec cycle rate
|
Information Bandwidth: |
< 0.004 nT / √HzRMS) |
Heading Error: |
< ± 1 nT |
Gradient Tolerance: |
> 500 nT / inch >20,000 nT / meter |
Temperature Drift: |
0.05 nT per 'C |
Cycle Rate: |
Variable from 0.1 sec to 1 hr in 0.1 sec steps or by external trigger. |
Data Storage: |
Nonvolatile RAM with capacity for 8 hrs of Magnetometer time, event marks, field notes, location, or 3 hrs of Gradiometer and 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, low battery or Quality Control setting exceeded
|
Data Output: |
Three wire RS232 standard serial port, optional continuous real time transmittal of data via RS232 to PC. Total memory output transfer time less than 5 min. at 115,200 KBaud. |
Visual Output: |
320 x 200 graphic liquid crystal display, day light visible with selectable outputs for: |
I. Data display: Up to 5 stacked profiles, real time or review mode. Survey grid showing boundaries and position.
2. All system setup functions, e.g., memory status, data transfer, sample time.
3. All Survey setup functions, e.g., survey profile number and direction, station or GPS number, test line number.
4 Survey monitoring functions, e.g., total field, noise level, profile number x or xy coordinates.
5. System diagnostics e.g., lamp brightness, signal level, battery state. |
Internal Clock: |
Resolution of 0.1 sec, drift: < I sec/day |
|
I. 12 VDC rechargeable gel cell, 6 hrs Magnetometer or 3 hrs Gradiometer usage. Magnetic effect less than I nT at 4 ft.
2. Internal backup battery for clock and nonvolatile RAM
|
Software: |
Supplied as part of the basic system and including functions for: |
Operating Software: |
|
|
a. Search Survey
b. Simple Survey
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, gradient
(differential)
to 0.1 nT, survey/map parameters and diagnostics.
|
| PC Support Software for installation on customer or Geometrics supplied
data processing computer: |
1. Data transfer and corrections:
|
a. Transfer of data from the field Magnetometer, Gradiometer,
Differential GPS, or Base station to PC.
b. Diurnal correction using base station data.
c. Processing the corrected data into ASCII values of XYZ for the
magnetometer and/or X,Y,ZI,Z2,Z3 for the gradiometer.
|
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: |
23/8" dia., 63/4" long, 12 ounces (6cm x 15 cm, 340 grams) |
Staff/Harness: |
Staff
for Magnetometer or Gradiometer, 1.5 lb to 2.5 lb (0.9 kg to 1.1 kg).
Nylon chest harness with cables attached, 2 lb to 3 lb (1 kg to 1.3 kg) |
Battery: |
3" H,
5" W, 8" L, 3.5 lbs (8 cm x 13 cm x 20 cm, 1.6 kg) attaches to harness. |
Console: |
6" W, 3" H, 11" L, 3.5 lbs. (15 cm x 8 cm x 28cm, 1.6 kg), attaches to
harness. Magnetic effect less than I nT at 4 ft |
ENVIRONMENTAL |
Operating Temperature: |
-25°C to +50°C (-13°F to +122°F) |
Storage Temperature: |
-35°C to +60°C (-30°F to +140°F) Water |
Tight: |
To 3 ft (0.9 m) |
Depth Shock: |
Drop 3 ft on a hard surface
without damage |
|
1. Gradiometer, horizontal and/or vertical configuration
2. GPS navigation (real time differential with radio link to GPS base
station or FM-transmitted RTCM codes)
3. MagAID Anomaly Identification Software, for use in estimating
position, size and depth of source bodies and buried objects. |
