Specifications
Protem Receiver
Measured Quantity
Rate of decay of induced magnetic field along 3 axes, in nV/m2
EM Sensor
Air-cored coils
Channels
1 channel used sequentially for 3 components, or 3 channels for 3 component simultaneous operation
Time Gates
20 gates covering 2 time decades or 30 gates covering 3 time decades
Dynamic Range
23 bits (132 dB)
base Frequency
0.3, 0.75, 3, 7.5, 30, 75 and 285 Hz or
0.25, 0.625, 2.5, 6.25, 25, 62.5 and 237.5 Hz
Integration Time
0.5, 2, 4, 8, 15, 30, 60 or 120 s
Display
240 x 64 DOT graphic LCD
Data Handling
Solid-state memory for 3, 300 data-sets, RS232 output
Synchronisation
Reference cable or, optionally, highly stable quartz crystal
Power Supply
12 V rechargeable battery for 8 h continuous operation
Weight
15 kg
Dimensions
34 x 38 x 27 cm
TEM-47 Transmitter
Current Waveform
Bipolar rectangular current with 50% duty cycle
base Frequency
30, 75 or 285 Hz where powerline frequency is 60 Hz
25, 62.5 or 237.5 Hz where powerline frequency is 50 Hz
Turn-Off Time
2.5 us at 3A into 40 x 40 m loop. Faster into smaller loop
Transmitter Loop
5 x 5 to 100 x 100 m single turn loop or
5 x 5 m 8-turn loop
Output Voltage
0 9 V, continuously variable
Power Supply
Internal 12 V rechargeable battery
Battery Life
5 h continuous operation at 2A output
Weight
5.3 kg
Dimensions
10.5 x 24 x 32 cm
TEM-57 Mk. 2 Transmitter
Current Waveform
Bipolar rectangular current with 50% duty cycle
base Frequency
3, 7.5 or 30 Hz where powerline frequency is 60 Hz
2.5, 6.25 or 25 Hz where powerline frequency is 50 Hz
Rates below 1 Hz available from Protem Receiver through reference cable
Turn-Off Time
20 to 115 us depending on size, current and number of turns in transmitter loop
Transmitter Loop
Single turn: Any dimension; Minimum resistance is 0.7 ohms, up to 300 x 600 m. 8-turn; 5 x 5 or 10 x 10 m.
Output Current
25 A maximum
Output Voltage
18 V to 60 V continuous control with motor generator, up to 160 V (3, 800 W)
Synchronization
Reference cable or, optionally, quartz crystal
Power Supply
1, 800 W, 110/220 V, 50/60 Hz single-phase motor generator or, optionally multiple 12 V batteries
Transmitter Protection
Electronic and electromechanical protection short circuit
Transmitter Weight
15 kg
Transmitter Dimensions
43 x 25 x 25 cm
TEM-67 Transmitter
Current Waveform
Bipolar rectangular current with 50% duty cycle
base Frequency
0.3, 0.75, 3, 7.5 or 30 Hz where powerline frequency is 60 Hz
0.25, 0.625, 2.5 or 25 Hz where powerline frequency is 50 Hz
Rates below 1 Hz available from Protem Receiver through reference cable
Turn-Off Time
20 to 750 us depending on transmitter loop size, current and number of turns.
Transmitter Loop
Up to 2, 000 x 2, 000 m minimum
Output Current
25 A maximum
Output Voltage
18 to 150 V continuously adjustable
Synchronization
Reference cable or, optionally, quartz crystal
Power Supply
4, 500 W, 115 or 110/220 V, 50/60 Hz single-phase with 8 h continuous operation motor generator
Transmitter Protection
Electronic and electromechanical protection short circuit
Transmitter Weight
15 kg (TEM-57 MK. 2); 12 kg (TEM-67 power module)
Transmitter Dimensions
43 x 25 x 25 cm (TEM-57 Mk. 2); 42 x 20 x 31 cm (TEM-67 power module)
Motor Generator Weight
62 kg
Motor Generator Dimensions
60 x 50 x 49 cm