Working conditions :
1.   Ambient temperature:  -30° to +50° C
2.   Atmospheric pressure:  100⁵  kPa
3.   Humidity :  to % at 30° C
4.   Power supply:  12±1.2 V; recording method: direct magnetic recording with high-frequency magnetization
5.   Number of auxiliary Channels:   3 (at 3 amplitude levels);  6 (at 2 amplitude levels);  12 (at 1 amplitude level)
6.   ?
7.   Tape speeds: 0.5 (±0.01) / 1.0 (±0.02) / 2.0 (±0.04)   mm/s;  the mag. tape moves only forward: there's not rewinding
8.   Frequency range at 3 dB level:   0.7 - 16 Hz  (at 0.5 mm/s);   0.7 - 32  (1.0 mm/s);  0.7 - 64 (2.0 mm/s)
9.   Non-identity phase not moves more than ±5% of the period
10. Non linear distortions: 3% at 30 Hz sygnal frequency
11. Polarity of channels:  the same
12. When recording at several levels, each subsequent level is approximated to the foregoing on by 36 bB
13. The common dynamic range is not less than:  112 dB (3-channels recordings);  72 dB (2-channels);  42 dB (1-channel)
14. The seismic channel noise level is not more then 2.8 mkw (double amplitude value)
15. Reciprocal effect between the channels:  42 dB
16. Amplitude non identity of seismic channels is not more than 10%
17. The quartz-clock provides a time-coded signal: a) year, b) month, c) date, d) hours, e) minutes, f) seconds, g) auxiliary info: station code, magnetic heads block (left or right)
18. Error of the code of hours of the station: not more than ±0.01 s (for 1 day and night); not more than ±0.10 s
19. The clock is started up: a) by hand,  b) automatically - by a signal from the control-block
20. Calibration is made by: a) sinusoidal signal of 4 fixed frequencies:  0.5 - 1.0 - 2.0 - 4.0  Hz;  b) 4 impulses
21. Calibrations are made 1 to 3 times in a day
22. The recording station provides switching over the maximum rec. speed (2 mm/s) with automatic return to the initially established value after   32 min.:   a) by automation once in 24 hours according to a program entered before the registration;  b) by a signal from a remote controlled device
23. The station provides recording at all channels of 4 timing marks
24. The station checks by a control block:   a) the supply Voltage;  b) control of the recording current;  c) control of the level of microseisms;  d) starting up and control of the clock operation;  e) control of the frequency of seismic receivers;  f) control of speed.