CLEM-V High-power Multi-purpose Electromagnetic System

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Main application:
l   Deep metallic and non-metallic mineral resources exploration;
l   Geothermal and groundwater exploration;
l   Petroleum and natural gas resources exploration;
l   Coal goaf, karsts development zone and air defense project exploration; Active fault survey, crust and earthquake research;
l   Roadbed, tunnel of highways and railways exploration;
l   Environmental pollution monitoring and detection.

Main Function:
Array type fusion detection in manner of natural field electromagnetic method and artificial field electromagnetic method are able to be carried out (CSMAT, TDIP, FDIP, SIP, CR)

1. CLEM-30T High-power Electromagnetic Transmitter

Features and Functions

  • Multi-function transmitting: meeting high-power transmitting requirements of CSAMT, TDIP, FDIP, SIP, and CR;

  • Single-frequency and multi-frequency power supply: multi-parameter measurement, improving work efficiency;  

  • Fully automatic frequency sweep power supply: automatic switching of power supply as per operating frequency setting, without human intervention;

  • High-precision GPS + oven-controlled crystal synchronization technologies: no time drift accumulation, achieving all-weather precise and synchronized power supply;

  • CPLD based control technology: supporting upgrade of software and hardware. 

2. CLEM-R5 Array Electronic Receiver

Features and Functions

  • Multi-parameter measurement: able for measurement in methods such as AMT, CSAMT, TDIP, FDIP, SIP, and CR;
  • Array observations: able for independent operation of single set, and array type wireless networking operation of several sets;
  • Automatic measurement: able for automatic measurement through all methods, thus to reduce manual operating strength, and improve work efficiency;
  • Synchronization technology: high-precision GPS + oven-controlled crystal synchronization technologies, and no time drift accumulation, thus to achieve all-weather precise and synchronized measurement;
  • Dual ADC: one high-speed and one low speed true 24-bit ADC respectively for each channel
  • FPGA based technology: supporting online upgrade of software and hardware.


1. CLEM-30T High-power Electromagnetic Transmitter

Frequency Range


High density frequency

20-frequency points for each frequency magnitude

Maximum voltage


Maximum current


Maximum power


Power waveform

multi-frequency, single-frequency

Operating modes

automatic or manual

Protection function

overvoltage, overcurrent, overheating

GPS Synchronization accuracy


Thermostatic Transistor Synchronization accuracy

4μS/hour ±0.081μS






2. CLEM-R5 Array Electronic Receiver

Frequency Range

32kHz ~ 1/128Hz

Channels number

1 to 8 optional


PC-104,300M main frequency

Storage Media

electronic disk 2GB

GDP Synchronization Accuracy

UTC ± 20nS

Thermostatic Transistor Synchronization accuracy

4μS/hour ±0.081μS

Channel Gain

1,4,16,64,256 five types preamplifier gain

1,2,4,8 four types main amplifier gain




7.5kginclude lithium battery



System Components:

CLEM-P30 High-power supply,

CLEM-T30 High-power electromagnetic transmitter,

CLEM-R5 array electromagnetic receiver,

magnetic sensor.

processing software, and other related accessories.