... etc, especially for long time unattended testing System consists of data acquisition device, zero time receiver and built-in geophone. ... before lithium cell, voltage after lithium cell, sampling point data.21Length of Data File Name, 8-Bit: The first 6 digits ... Qty: 127 Under-voltage Indication Function DZS-1 3D Data Acquisition Utilizes Explosion And Huge Seismic Wave Deep Digital Seismograph