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The recorders as a part of the ACF-2.2 system ( М-К2-SМ27) or ACF-4M system (М-К4-SМ27)are intended for field electro prospecting investigations by methods of the audiomagnetotelluric soundings (AMTS), frequency soundings (FS) and for the electromagnetic monitoring.
The recorder is intended for transformation of received analog signals into digital codes of data acquisition (data collection), primary processing and storage in a digital form of information in non-volatile Flash-memory.
Channels of the recorder are connected with the two transformers of the induction low-frequency magnetic field (magnetic coil sensors or magnetic antennae) and two grounded electrical antennae via remote preamplifier.
Recorders have the metrological sertificate of quality.

The recorder collects and stores data (along with service information, including coordinates, time etc) in digital form in Flash-memory.
The results of measurements are recorded in the file of *.sbf format. Each file contains records of time series of specified frequency ranges, the results of spectrogram calculations by processor of the recorder, the data of calibration, and additional information (time, coordinates, serial numbers of the antennae, comments of the operator, etc).
The main mode of the recorder is the mode of time series acquisition (collection). Mode of spectrograms measurements is parallel to the time series mode.
The recorder provides visual control of data directly at observation picket on the built-in display.
Software tools provide setting of parameters of data collection, allow producing of initial checking of the recorder functioning, exchange data with PC and to check results of data collection and their processing in digital and graphic forms.
In the free running mode the management of the recorder is carried out with the help of keypad, installed on the front panel of the recorder.
The management of the recorder can be carried out from the host PC with help of Ethernet. In field conditions portable PC (Notebook) can be used.
Power supply of the recorder is provided by an external or built-in accumulator.

Number of synchronous channels:

2(for М-К2-SМ27)

4(for М-К4-SМ27)

ADC data, bits: 24
Range of input signals: not more, then 30 mV

Operating frequency ranges :

0,31 – 40 Hz,

1,56 – 400 Hz,

6,24 – 800 Hz(for М-К4-SМ27)

Sampling rates:

160 Hz,

1600 Hz,

3200 Hz(for М-К4-СМ27)

Level of self-noise (RMS) within 10 – 800 Hz, brought to the input : not more, then 35nV/Hz1/2
Notch filter 50 Hz
The channel of data unloading: Ethernet 10 (UDP) 10 Mbytes/sec
GPS support

Frequency grid

discontinuity: not less than 10-5

stability (total by all factors) not less than 10-7

Volume of the built-in accumulator: 8 А*hours
The voltage of power supply: 10,5…15 V
Resource (in the built-in accumulator): not less, than 14 hours

Dimensions: not more, then 400 х 230 х 180 mm
Weight : not more, then 5kg