Airborne Mag Products

High Resolution Integrated Field Measurements

The CM-201 Larmor Counter combines for the first time a low power,  compact counter assembly for Cesium Magnetic Sensors, with the extreme accuracy required for optimal magnetometer system performance. Inside the CM-201 module, the signal is processed and converted to ASCII digital data, then sent to the RS232 port. Data output rates are selectable up to 100 Hz. Resolution is 0.02 nT at 10 Hz and is proportionally better at lower output data rates.

Resources:

In addition to the counting function, the module will output ASCII data from six 12-bit A/D converters and an elapsed time clock for Julian time/date. The counter module may be synchronized with an external pulse or trigger event. The CM-201 module is sized to fit within Geometrics' existing sensor  driver electronics assembly, and its power may be derived from the same basic 24-30 VDC supply.

Features:
  • Sensitivity better than 0.002 nT at 1 hz, 0.02 nT at 10 Hz
  • Stackable operation with up to twenty counters and sensors
  • Versatile functions: Simple setup commands, programmable outputs, multiple A/D channels, Julian date and time
  • Cycle rates sellectable from 100 Hz to 0.1 Hz 
  • Combined RS-232 output from several sources at up to 19,200 baud
  • Suitable for airborne, marine, land vehicle, and base station applications

Specifications:

Installation:Factory installed within existing driver electronics module. Contact  factory for information regarding upgrading existing sensors.

Power:Each Cesium sensor with associated driver electronics and Larmor counter:  24-32 VDC, 1 amp at turn-on and 0.5 amp thereafter. CM-201 alone runs on single 5-volt supply at 0.30 amp.

Operating Range:70 kHz to 350 kHz corresponding to earth's field strength of 20,000 nT to 100,000 nT

Operating Temperature:-25oC to +50oC (-13oF to +122oF)

Data Output:Three wire RS232 standard serial port. Concatenated serial data from  multiple Larmor counters defined by user. Each counter individually addressed and configured with commands echoed through all counters.

Julian clock:Time of day, hour, second, and fractional seconds may be individually  selected for output. Resolution is 0.01 seconds and drift is less than 1 second per day. Time / date reset to computer time at power turn-on.

Accuracy Throughout Range:

Software provided:Setup utility for PC-based systems.

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