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The device replaces the devices for checking the attenuators D1-13A and D1-25. D1-29 is a step attenuator with a range of attenuation from 0 to 110 dB with a step of 10 dB, operating in the frequency range from 0 to 150 MHz. The device consists of a housing with damping cells and a switch with a counting device. The housing contains coaxial input and output connectors, as well as additional connectors "40 dB" and "80 dB", necessary for the verification of the device. Technical specifications Operating frequency range 0 – 150 MHz Difference attenuation setting range (after 10 dB) 0 – 110 dB Input electrical resistance to direct current 50 ± 0.1 ohms The output electrical resistance to direct current when connected to the load input is 50 ± 0.1 ohms 25 ± 0.1 ohms The main absolute error of the difference attenuation setting relative to the 0 dB mark at direct current ± (0.002 - 0.02) dB The main absolute error of the difference attenuation setting relative to the 10 dB mark in the frequency range up to 30 MHz ± (0.004 - 0.9) dB The main absolute error of the difference attenuation setting relative to the 10 dB mark in the frequency range over 30 to 150 MHz ± (0.09 - 3.0) dB The maximum permissible value of the electrical voltage (DC or AC) at the input of the attenuator 3 In the operating temperature range from 5 to 40 ° C Overall dimensions, mm 149x95x149 Weight, not more than 3 kg

Basic properties Wide frequency range; Small VSWR values. Operating conditions Operating temperature range from minus 10 to 50 ° C; The relative humidity of the air is up to 98% at a temperature of 25 ° C. Technical specifications Nominal attenuation, dB 30 Attenuation error, dB ± 1.5 VSWR 1.4 Frequency range, GHz 0-18 Input power, W 1 Type of coaxial connectors (according to GOST RV 51914-2002) IIIB-IIIP

Basic properties Wide frequency range; Small VSWR values. Operating conditions Operating temperature range from minus 10 to 50 ° C; The relative humidity of the air is up to 98% at a temperature of 25 ° C. Technical specifications Nominal attenuation, 20 dB Attenuation error, dB ± 1.0 VSWR 1.4 Frequency range, GHz 0-18 Input power, W 1 Type of coaxial connectors (according to GOST RV 51914-2002) IIIB-IIIP

Ecofizika-500 is a multifunctional modern platform for building complex measuring systems. The developed software makes it possible to fully use the powerful hardware potential of the system in tasks requiring the use of complex computational algorithms. Ecofizika-500 is not just another multi-channel frontend designed to transfer unprocessed data to a computer; it is an independent measuring device capable of calculating a huge number of quantities in real time, storing them in its own memory and (or) issuing them to a telemetry channel. The device can be used, including in offline mode, as a data logger, which is very important when testing complex equipment that limits the presence of the operator. Ecofizika-500 has an approved type of measuring instrument and methodological support for measuring acoustic and vibrational quantities.