Генераторы Астра

Astra transmitters

Lightweight and compact current transmitters belongs to a new line of "smart" devices manufactured by Nord-West Ltd.

Purpose

Astra transmitters are compact portable EM current transmitters which could be used in resistivity methods, induced polarization methods, frequency soundings and other.

Application

Due to a wide range of operating frequencies and currents, Astra transmitters can be used for a wide range of tasks

Hydrogeological and permafrost

Groundwater prospecting, assessment of water saturation and fluid mineralization, mapping of perennially frozen rocks, identification of taliks and cryopegs

Structural and mapping

Determination of the geological structure and rocks composition

Ecological

Investigation of areas of groundwater and soil contamination, identification of leaks in storages and disposals

Exploration for mineral deposits

Metals, ore, coal, diamonds, etc.

Engineering geology and geotechnical

Investigation of soil conditions, study of areas of karst development, landslides, study and monitoring of dams, waste disposal sites, bases of structures and pipelines, study of underground communications and other anthropogenic objects.

Description

Now two types of transmitter are manufactured: Astra-20 (power 20 W) and Astra-100AT (power 100W), which replaced Astra-100 transmitter produced until 2023. Description and specifications of Astra-100 are listed there for comparison.

Astra-20

Compact transmitter for engineering and ecological prospects with maximum output power 20 W and output voltage 400 V. Nothing extra, only the most demanded functionality with minimal size and weight.

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Astra-100

Astra-100 – is the transmitter with maximum output power 100 W, output voltage 400 V and current strength 1000 mA. Classic among compact EM transmitters.

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Astra-100AT

A new compact transmitter, which replaced Astra-100. Astra-100AT weights almost 2 times less with smaller size, same output power and higher output voltage (700 V).

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Choose your Astra

Astra-20

Maximum output power 20 W
Maximum output voltage 400 V
Current range 1-100 mA
Number of currents: 10
Signal form: meander
One frequency set (0.076-2500 Hz)
Weight 0.4 kg
140х110х38 mm
-
Smartphone controlled

396000

Buy

Astra-100

Maximum output power 100 W
Maximum output voltage 400 V
Current range 1-1000 mA
Number of currents: 16
Signal form: meander
Three frequency sets (0.076-2500 Hz)
Weight 2.0 kg
200х173х113 mm
Manual controlled
-

547800

Buy

Astra-100АТ

Maximum output power 100 W
Maximum output voltage 700 V
Current range 1-1000 mA
Number of currents: 22
Meander and meander with pause
Four frequency sets (0.076-2500 Hz)
Weight 1.1 kg
165х130х55 mm
Manual controlled
Smartphone controlled

594000

Buy

Maximum output power;20 W; 100 W;100 W; Maximum output voltage;400 V; 400 V;700 V Output current values and corresponding ranges of supply line contact resistance values;1.0 mA : 8.0 ÷ 400 kOhm — 2.0 mA : 4.0 ÷ 200 kOhm — 5.0 mA : 1.6 ÷ 80 kOhm — 10.0 mA : 0.8 ÷ 40 kOhm 14.1 mA : 0.56 ÷ 28.4 kOhm 20.0 mA : 0,4 ÷ 20 kOhm 31.6 mA : 0.25 ÷ 12.7 kOhm 50.0 mA : 160 ÷ 8000 Ohm 70.7 mA : 80 ÷ 4000 Ohm 100 mA : 40 ÷ 2000 Ohm; 1.0 mA : 8.0 ÷ 400 kOhm — 2.0 mA : 4.0 ÷ 200 kOhm — 5.0 mA : 1.5 ÷ 80 kOhm — 10.0 mA : 0.8 ÷ 40 kOhm 14.1 mA : 0.6 ÷ 28 kOhm 20.0 mA : 0,4 ÷ 20 kOhm 31.6 mA : 0.25 ÷ 12.6 kOhm 50.0 mA : 160 ÷ 8000 Ohm 70.7 mA : 113 ÷ 5660 Ohm 100 mA : 80 ÷ 4000 Ohm 141 mA : 57 ÷ 2800 Ohm — 200 mA : 40 ÷ 2000 Ohm — 316 mA : 20 ÷ 1000 Ohm 500 mA : 8 ÷ 400 Ohm 707 mA : 4 ÷ 200 Ohm — 1000 mA : 2 ÷ 100 Ohm;1.0 mA : 15.0 ÷ 700 kOhm 1.5 mA : 10.0 ÷ 467 kOhm 2.0 mA : 7.5 ÷ 350 kOhm 3.50 mA : 4.3 ÷ 200 kOhm 5.0 mA : 3.0 ÷ 140 kOhm 7.5 mA : 2.0 ÷ 93 kOhm 10.0 mA : 1.5 ÷ 70 kOhm 15.0 mA : 1.0 ÷ 46.7 kOhm 20.0 mA : 0.75 ÷ 35 kOhm 35 mA : 0.43 ÷ 20.0 kOhm 50.0 mA : 0.3 ÷ 14 kOhm 75 mA : 0.2 ÷ 93 kOhm 100 mA : 0.15 ÷ 7 kOhm 130 mA : 0.116 ÷ 5.38 kOhm 160 mA : 0.079 ÷ 3.9 kOhm 200 mA : 0.05 ÷ 2.5 kOhm 250 mA : 0.032 ÷ 1.6 kOhm 350 mA : 16.5 ÷ 817 Ohm 500 mA : 8.0 ÷ 400 Ohm 700 mA : 4.1 ÷ 204 Ohm 850 mA : 2.8 ÷ 139 Ohm 1000 mA : 2.0 ÷ 100 Ohm; Output current form;RPI-1 («meander», rectangular multipolar pulses without pause). — Sweep-signal (combination of RPI-1 with different frequency).;RPI-1 («meander», rectangular multipolar pulses without pause). — Sweep-signal (combination of RPI-1 with different frequency).; RPI-1 («meander», rectangular multipolar pulses without pause). RPI-2 («meander», rectangular multipolar pulses with pause). Sweep-signal (combination of RPI-1 and PRI-2 with different frequency). Operating frequency (Hz):;1-100 mA: 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 Hz. 10-100 mA: 1250, 2500 Hz.;Set 1 (16 frequencies): 0.076‑2500 Hz. Set 2 (16 frequencies): 0.0625‑2048 Hz. Set 3 (14 frequencies): 0.083‑683 Hz.; Four sets of 16 frequencies in RPI-1 mode: Set 1: 0.076-2500 Hz Set 2: 0.0625-2048 Hz Set 3: 0.08333-2730.(6) Hz Set 4: 0.061-2000 Hz Efficiency; to 85%; to 80%; to 85% Absolute error of factory adjustment of output currents at room temperature, 12.6/14.8 V supply voltage, 0.3 Hz frequency and 30% of maximum load;not more than 0.25% (output current value is defined as the average value of positive and negative polarity currents); not more than 0.25% (output current value is defined as the average value of positive and negative polarity currents); not more than 0.25% (output current value is defined as the average value of positive and negative polarity currents) Instability of output currents when the load varies from 3% to 85% of maximum, at room temperature, at a frequency of 0.3 Hz and a supply voltage of 12.6/14.8 V, for currents:;14.1 - 1000 mA – less than 0,1%. 1 - 10 mA – less than 0,2% (output current value is defined as the average value of positive and negative polarity currents); 14.1 - 1000 mA – less than 0,1%. 1 - 10 mA – less than 0,25% (output current value is defined as the average value of positive and negative polarity currents);less than 0,25% (output current value is defined as the average value of positive and negative polarity currents) Drift of output currents in the operating temperature range relative to the values at +20°C;less than ±0.5% (output current value is defined as the average of positive and negative polarity currents);less than ±0.5% (output current value is defined as the average of positive and negative polarity currents);less than ±0.5% (output current value is defined as the average of positive and negative polarity currents). Relative error of frequency formation, including drift in the operating temperature range and aging during the first year of operation, less than; 5⋅10-6;5⋅10-6;5⋅10-6 Duration of current edge of RPI-1 on active load of 1 kOhm, not more;2 µs;2 µs;2 µs Operating temperature range; from - 20°C to + 50°C, without condensation;from - 20°C to + 50°C, without condensation;from - 20°C to + 50°C, without condensation Mode of operation; continuous, in field conditions, but without direct exposure to atmospheric precipitation;continuous, in field conditions, but without direct exposure to atmospheric precipitation;continuous, in field conditions, but without direct exposure to atmospheric precipitation Supply voltage;12,6 V (Pb battery) 14,8 V (Li-Po battery) minimum 10.5 V, maximum 17 V; 12,6 V minimum 10,5 V, maximum 14,8 V;12,6 V (Pb battery) 14,8 V (Li-Po battery) minimum 10.5 В, maximum 17 В Current consumption;not more than 2,5 А;not more than 12 А;not more than 12 А Weight;~ 0.4 kg;~ 2.0 kg;~ 1.1 kg Dimensions;140х110х38 mm;200х173х113 mm;170х140х55 mm Control;— In external control mode - using Astra-20 program via a smartphone with Android 9 and later operating system.;In autonomous mode - keypad and 4-strigs display.;In autonomous mode - keypad and 1-string display. In external control mode - using Astra-100AT program via a smartphone with Android 9 and later operating system. Connection interface;Bluetooth in SPP mode (Serial Port Profile); —; Wi-Fi connection Sound indication;- generation (optionally), - AB line break, - load more than 99%, - load less than 2%, - low supply voltage, - overheating;- generation (optionally), - AB line break, - load more than 99%, - load less than 2%, - low supply voltage, - overheating;- generation (optionally), - AB line break, - load more than 99%, - load less than 2%, - low supply voltage, - overheating Sockets;- AB line - shut 10 Ohm ±1% - supply;- AB line - shut 1 Ohm ±1% - supply - synchronization;- AB line - shut 1 Ohm ±0.25% - supply Hermetically sealed metal case;Standard IP-65;Standard IP-65;Standard IP-65

Device control

The transmitter can be controlled by any smartphone or tablet running Android 9 or later.

The Astra-20 is connected to the smartphone by Bluetooth connection.
The Astra-100AT transmitter - by Wi-Fi network.

Free applications Astra-20 and Astra-100AT for transmitters control are available in Google Play.

Operation convenience

All information
on one screen

The main window displays all necessary parameters

Determine status

The displayed status helps to determine the device status and causes of malfunctions

Frequency change "on-line"

Change the signal frequency without stopping generation

Situation control

Load, ground resistance, and output voltage information are collected in one block

Assess the possibilities

Color indication allows you to determine the range of available currents

Timely satisfaction of needs

Monitor the charge level of the external battery for quick replacement

The control program allows you to easily set in a cycle the generation of a rectangular signal at different frequencies, determine the load and the range of allowable currents at the current level of ground resistance in the line AB

Perfect match!

Astra-20 and Astra-100AT transmitters are perfectly matched with new receivers MARY Smart. The receiver-transmitter pair could be controlled by one smartphone by "MARY Smart" app
Thanks to wireless communication and a unified application, it is possible not only to increase the convenience of work, but also to reduce the number of personnel required for field work. With the new Astra transmitter and the MARY Smart receiver field works with VES method can be performed by two people.

Learn more about MARY Smart

Prices and delivery sets

Astra-20

Current transmitter

396 000

р.

Delivery set:

Astra-20 current transmitter
Rugged smartphone BlackView (IP68) in a basic configuration
Portable battery for smartphone
Carrying bag
Documentation (device passport and operating instruction)
Power supply cable for 12V external battery with flat F1 connectors

For purchasing inquiries, please contact us by e-mail

Astra-100

Current transmitter

547 800

р.

Delivery set:

Astra-100 transmitter
Carrying bag
Documentation (device passport and operating instruction)
Power supply cable for 12V external battery with flat F1 connectors

For purchasing inquiries, please contact us by e-mail

Astra-100АТ

Current transmitter

594 000

р.

Delivery set:

Astra-100AT current transmitter
Rugged smartphone BlackView (IP68) in a basic configuration
Portable battery for smartphone
Carrying bag
Documentation (device passport and operating instruction)
Power supply cable for 12V external battery with flat F1 connectors

For purchasing inquiries, please contact us by e-mail

Developed by Andrey Titov!

Astra-20 and Astra-100AT transmitters were created by Andrey Yurievich Titov, the developer of such best-selling devices as Astra-100, MERI Smart and IMVP receivers

The rights to Astra, Astra-20, Astra-100, Astra-100AT, Astra-400 and Astra-800 trademarks belong to "Nord-West" Ltd.

We will answer all your questions

To find out more, arrange a demonstration or appointment, email us at mail@nw-geophysics.com or send us an inquiry using the form below:

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