Research Article
Characteristics of Valuable Microseismic Events in Heading Face of an Underground Coal Mine Using Microseismic System
Table 1
Parameters of the acquisition instrument used in the MS system of 117 track gateway.
| Parameter | Parameter description |
| Number of channels supported | Max of 12 (4 used in 117 track gateway) | Installation position | Underground | Sampling frequency | Max of 10 kHz (2 kHz used in 117 track gateway) | Synchronization time error of each channel | Less than 10−6 s | Safety level | IP 54 (China) | Explosion proof grade | Exd I (China) | Connection mode | Two core cable connection | Executive standards | GB3836.4-2000 (China); | GB/T24260-2009 (China) |
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