KMS-850 Data Acquisition Station
The KMS-850 Data Acquisition Station (DAS) 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 station has up to six channels of 24-bit low noise, low drifting input. These channels are sampled simultaneously and synchronized with GPS. In addition, KMS-850 has expandable GPS synchronized digital interface for additional customized timing requirements. The data is saved on a SD card and can be streamed via USB or a wireless network for real-time quality check purpose. The windows based software is provided for real-time status monitoring.
The difference between KMS-850 and KMS-820 is the isolated channel modules. KMS-850 is equipped with isolated channel modules while KMS-820 is not.
System specifications
| Number of channels | Up to 6, isolated channel modules |
| A/D resolution | 24 bit |
| Signal bandwidth | DC to 40 KHz with two low pass filter settings (default 500 Hz and 40 KHz, can be adjusted), additional low pass filter with half of the sampling rate is implemented inside 24-bit sigma-delta A/D |
| Sampling rate | Up to 312 KHz |
| Input impedance | 10 M Ohm, or adjust to specific application |
| Input signal level | -2.5 ~ +2.5 V, with ground or actively driven shielding provided |
| 8 Gain with AGC | Up to 10,000, adjust to specific application, with 8 gain setting with AGC (Automatic Gain Control) |
| DC offset removal | Each channel has its own 16-bit D/A to remove external DC offset |
| 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 waveform dislplay and quality check |
| On-board temperature measurment | Yes |
| Power supply | External +6.5 ~ 30 Vdc supply or directly from USB of computer |
| Temperature rating | -30° to 70° C |
| Additional interface | Optional digital interface to accomodate additional cutomer timing and digital interface requirements |
| Enclosure | Waterproof, compact, lightweight, and impact resistant |