Science and technological developments: article

Аnnotation: The article describes an autonomous three-channel digital recorder developed at Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences. The recorder was developed taking into account the requirements of work in very harsh climatic conditions, minimum energy consumption and ease of maintenance. Particular attention is paid to the reliability of data storage during sudden power failures, for which a new recording format has been developed. A non-file system was used, assigning to each second of the data of the service line, consisting of the exact time, the station code and the location coordinates of the station. The user do not lose a second of data when reading. When the power is restored, the recorder automatically enters into the operating mode and continues the interrupted recording. The power supply of the analog part of the recorder is galvanically isolated from the power supply of the digital part and carefully smoothed by special linear stabilizers and filters. To exclude the penetration of pulsations from the digital part to the analogue via common (ground) wire, the control interface of the ADC is separated from the microcontroller by digital galvanic isolation circuits. The collected data is removed by replacing the memory card and takes only a few seconds. Control is also minimized, since the recorder has only 2 control buttons. Simplicity of service allows you to quickly install a large number of seismic stations with a small number of maintenance personnel. The most important distinguishing feature of the recorder is a significantly reduced power consumption (less than 0.7 A∙h per day at 12 V supply voltage). This is 5-6 times lower than that of domestic and foreign analogs and allows the recorder to operate from one set of dry batteries with a capacity of 150 A∙h and a weight of 4 kg over 6 months. As part of seismic monitoring systems and during epicentral measurements, these recorders are used in all climatic zones of the northern hemisphere from Serbia to Sakhalin and from Yakutia to Bangladesh, and proved to be reliable and unpretentious devices.