ASTRA 20

Astra 20 is a modern, portable electric current transmitter with the maximum output power of 20 W, ouput voltage of 400 V and output current of 100 mA. It is intended for being used in the frequency-domain resistivity & IP exploration of shallow (up to 50 m) targets, and is controlled from any Android-operated smartphone or tablet via the Bluetooth wireless connection. The output signal is squarewave with the fundamental frequency values from 0.08 Hz to 2 500 Hz.

Astra 20 is powered by an external 12V DC battery.

Max. output power ;20 W Max. output voltage;400 V Output current values with the corresponding acceptable range of the transmitting line contact resistance values ;1.0 mА : 8.0 kOhm÷ 400 kOhm 2.0 mА : 4.0 kOhm÷ 200 kOhm 5.0 mА : 1.6 kOhm÷ 80 kOhm 10.0 mА : 800 Ohm÷ 40 kOhm 14.1 mА : 560 Ohm ÷ 28.4 kOhm 20.0 mА : 400 Ohm÷ 20 kOhm 31.6 mА : 250 Ohm÷ 12.7 kOhm 50.0 mА : 160 Ohm÷ 8000 Ohm 70.7 mА : 80 Ohm÷ 4000 Ohm 100 mА : 40 Ohm÷ 2000 Ohm Ouput current waveform; squarewave signal, sequence of squarewave signals with different frequencies Operating frequencies (Hz, some of the given values are approximate, the exact values could be obtained by repeated dividing 2 500 Hz by 2):;1-100 mА: 0.076, 0.153, 0.305, 0.610, 1.22, 2.44, 4.88, 9.77, 19.5, 39.1, 78.1, 156, 312.5, 625 10-100 mА: 0.076, 0.153, 0.305, 0.610, 1.22, 2.44, 4.88, 9.77, 19.5, 39.1, 78.1, 156, 312.5, 625, 1250, 2500. Efficiency factor;Up to 85% Absolute error of the average output current value at 0.3 Hz, moderate load (<30%), normal power supply voltage (12,6/14,8 V) and room temperature;less than 0,25% Additional inaccuracy of the average output current value at 0.3 Hz due to increased load (<85%) for different current values;14.1 mА - 100 mА – less than 0,1% 1 mА - 10 mА – less than 0,2% Additional inaccuracy of the average output current value due to the temperature deviation within the accepted temperature range;less than ±0,5% Frequency instability, including frequency drift within the operating temperature range and aging of the equipment during the first exploitation year;< 5⋅10-6 Wavefront duration on active load 1 кOhm;< 2 microseconds Operating temperature range;from - 20°C to + 50°C, without condensation Type of duty;continuous, fieldwork, without direct impact of atmospheric precipitation Power supply voltage;12,6 V (Pb batteries) 14,8 V (Li-ion batteries) min 10.5 V, max 17 V Current consumption;< 2,5 А Weight;~ 0.4 kg Dimensions;140х110х38 mm Controlled by;Astra-20 software installed on any smartphone or tablet based on OS Android 9.0 or newer Connection interface;Bluetooth in Serial Port Profile (SPP) mode. Sound indication;- transmission in progress (optional) - transmitting circuit break - overload (~100%) - underload (< 2%) - low supply voltage - overheat Connectors;- transmitting line AB - 10 ± 0,01 Ohm resistor - power supply Ingress protection rating;IP-65

We have created a special website for Astra family transmitters where you can learn more about them and compare with each other.

Astra-Transmitter.com