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By consolidating the PROTEM receiver and TEM47 transmitter components into a single console, the PROTEM CM system offers significant improvements in portability and convenience: As compared to the individual receiver and transmitter components, the PROTEM CM is both smaller in size, and less in weight by about half. The increase in component portability will be of particular benefit for surveys in more demanding environments, both in-mine and over rugged terrain.
Available with cable reference synchronization only, for either single component or sequential three-component data collection, PROTEM CM otherwise offers the same functions and performance characteristics as the standard PROTEM 47 components, and is compatible with all other Geonics transmitters.
For greater depth of exploration, a high power (HP) modification to increase the output current from the transmitter section is available as an option.
| Specifications | |
| RECEIVER SECTION | |
| MEASURED QUANTITIES | |
| Rate of decay of induced magnetic field along 3 axes | |
| TIME GATES | |
| 20 or 30 geometrically spaced gates for each base frequency, range from 6 μs to 800 ms | |
| BASE FREQUENCY | |
| 0.3, 0.75, 3, 7.5, 30, 75, 285 Hz, or | |
| 0.25, 0.625, 2.5, 6.25, 25, 62.5, 237.5 Hz | |
| DYNAMIC RANGE | |
| 29 bits (175 dB) including all gains | |
| SYNCHRONIZATION | |
| Internal terminals provided for cable reference with external transmitters | |
| DATA OUTPUT | |
| RS-232 serial, USB ports | |
| TRANSMITTER SECTION | |
| CURRENT WAVEFORM | |
| Bipolar rectangular current with 50% duty cycle | |
| BASE FREQUENCY | |
| 30, 75, or 285 Hz (60 Hz power line frequency) 25, 62.5, or 237.5 Hz (50 Hz power line frequency) |
|
| TURN-OFF TIME | |
| 2.5 μs at 2 A into 40 x 40 m loop; faster into smaller loop | |
| TRANSMITTER LOOP | |
| Any dimension from 5 x 5 m to 200 x 200 m; multiple-turn loops possible, from 1 x 1 m | |
| OUTPUT VOLTAGE | |
| CM: 0 to 9 V continuously adjustable (at 1 A load), or 24 V CM HP: 12 to 36 V with external batteries |
|
| OUTPUT CURRENT | |
| CM: 3.5 A maximum (7 A pp) with internal battery CM HP: 11 A maximum (22 A pp) with external batteries |
|
| GENERAL | |
| POWER SOURCE | |
| Internal 12/24 V rechargeable lithium-ion battery | |
| BATTERY LIFE | |
| 8 h continuous operation with 2 A transmitter current at 12 V output voltage | |
| OPERATING TEMPERATURE | |
| -30°C to +50°C | |
| DIMENSIONS | |
| 40 x 35 x 24 cm | |
| WEIGHT | |
| CM: 10.5 kg; CM HP: 11.7 kg | |
