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KMS-820 Data Acquisition Unit

The KMS-820 Data Acquisition Unit (DAU) is developed for EM (ElectroMagnetic) and seismic applications to obtain subsurface resistivity and velocity structure for oil and gas exploration. It also can be used in general purpose acquisition and long term monitoring services.

The acquisition unit has six 24-bit low noise, low drifting channels. These six channels are sampled simultaneously and synchronized with GPS. In addition, KMS-820 has expandable synchronized digital interface for additional customized timing requirements and has dedicated interface to drive KMS-500 marine transmitter.

System specifications

Number of channels

6

A/D resolution 24 bit
Signal bandwidth DC to 20 KHz with three selectable low pass filters (10 Hz, 1 KHz, and 20 KHz), additional low pass filter with half of the sampling rate is implemented inside 24-bit sigma-delta A/D
Sampling rate Up to 100 KHz
Input impedance > 1.0 M Ohm
Input signal level -2.5 ~ +2.5 V, with input signal level from -9.0 V to +9.0 V
Signal Gain 12 different gain settings from 1 to 2,560
DC offset removal Each channel has its own 16-bit D/A to remove external DC offset from -9.0 V to +9.0 V
Timing control GPS synchronized
Wireless network Long range wireless up to 8 Km (5 miles) depending on terrain or unlimited with relaying mode
Data saving and retrieving Data is saved to SD card; the files can be retireved from SD card or directly copied to PC through USB mass storage mode without removing SD card
Data monitoring Data can be read back through USB port or wireless network for real-time status monitoring and quality check
On-board temperature measurement Yes
Power supply External +7.5 ~ 32 Vdc supply or internal 12V battery; typical power consumption about 5 W.
Temperature rating -20 to 50 C
Digital interface UART interface for digital flux gate or other digital acquisition system
Customized digital interface Digital interface can be customized to accomodate additional cutomer timing and digital interface requirements
 

 

 

 

 

  HarbourDom GmbH 2012             impressum