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The comparator CHK7-1012 has a communication interface with an external personal computer USB 2.0 and application software for an external PC. At the request of the customer, the comparator can be supplied complete with a laptop or tablet computer with installed software.

The Ch1-1012 frequency standard is designed for mobile applications with high requirements for dimensions, weight and power consumption as an embedded signal source of high stability in frequency measuring devices and complexes, telecommunication systems, navigation and communication systems. This device can serve as a promising substitute for quartz generators in the development of high-resolution equipment, where the accuracy characteristics of a quartz generator are no longer sufficient.

The composition of the PM-8 verification module Frequency comparator CHK7-1011; Universal frequency meter Ch3-89; AC voltage voltmeter VK3-78A; Universal voltmeter V7-81; AC voltage calibrator H5-5; High-frequency signal generator G4-227; High-frequency signal generator G4-229; High-frequency signal generator G4-230; Absorbed power wattmeter M3-108; Installation for measuring attenuation D1-24/1; Device for measuring attenuation stepwise D1-25; Computational modulation meter SK3-49; The meter-calibrator of the harmonic coefficient SK6-20; Spectrum analyzer SK4-"Belan 240"; VSWR panoramic meter R2-135; VSWR panoramic meter R2-137; A set of exemplary measures of the transmission coefficient H3-7; Oscilloscope S1-157/4; DC power supply B5-79/1; AC power source B2-7 (2 pcs.); Electronic switch of microwave signals; PC, printer; Basic load-bearing structures (BNC). Technical specifications Measuring ranges of electrical quantities: Constant electrical voltage from 3 MV to 1000 V Alternating electric voltage in the frequency range of 10 Hz ... 2000 MHz from 10 mV to 100 V Frequency of continuous electromagnetic oscillations from 0.001 Hz to 17.85 GHz The power of continuous electromagnetic oscillations in the frequency range of 20 MHz ... 17.85 GHz from 0.8 to 10 MW Attenuation of electromagnetic oscillations in the frequency range 0.1 MHz ... 17.85 GHz from 0 to120 dB VSWR in the frequency range 0.2 ... 17.85 GHz from 1.03 to 2 Harmonic coefficient in the frequency range of 10 Hz ... 8 GHz from 0.005 to 100 % The amplitude modulation coefficient in the carrier frequency range of 100 kHz ... 17.85 GHz from 0.1 to 100 % Frequency deviation in the carrier frequency range of 100 kHz ... 17.85 GHz from 5 Hz to 1 MHz Phase modulation index in the carrier frequency range 100 kHz ... 17.85 GHz from 1 to 100 radians Phase shift between two harmonic signals in the frequency range 0.1 MHz ... 17.85 GHz from 0 to 360o Ranges of reproduction of electrical quantities: Alternating electrical voltage in the frequency range of 10 Hz ... 2000 MHz from 3 MV to 3 V Harmonic (sinusoidal) signal at a load of 50 ohms in the frequency range of 0.001 Hz ... 30 MHz from 0.01 to 5 V Continuous electromagnetic oscillations in the frequency range of 9 kHz ... 17.85 GHz from minus 120 to 13 dBm 5 and 10 MHz reference frequency signal Attenuation of electromagnetic oscillations in the frequency range 0 ... 3 GHz from 0 to 86 dB Measurement errors of electrical quantities: Constant electrical voltage ± (0.0025 ... 16.7) % Alternating electric voltage in the frequency range 10 Hz ... 2000 MHz ± (0.2 ... 16) % Frequency of continuous electromagnetic oscillations ± (2·10-7 ... 4·10-3) Power of continuous electromagnetic oscillations in the frequency range 20 MHz ... 17.85 GHz ± (4 ... 6) % Attenuation of electromagnetic oscillations in the frequency range 0.1 MHz ... 17.85 GHz ± (0.01 ... 1.2) dB VSWR in the frequency range 0.2 ... 17.85 GHz ± (3 ... 5) K Harmonic coefficient in the frequency range 10 Hz ... 8 GHz ± (0.005 ... 6) % Amplitude modulation coefficient in the carrier frequency range 100 kHz ... 17.85 GHz ± (0.1 ... 9) % Frequency deviation in the carrier frequency range 100 kHz ... 17.85 GHz ± (0.2 ... 80) Hz Phase modulation index in the carrier frequency range 100 kHz ... 17.85 GHz ± (0.02 ... 5) radians Phase shift between two harmonic signals in the frequency range 0.1 MHz ... 17.85 GHz ± (0.01 ... 0.08) o Errors in the reproduction of electrical quantities: Alternating electrical voltage in the frequency range 10 Hz ... 2000 MHz ± (0.16 ... 10) % Harmonic (sinusoidal) signal at a load of 50 ohms in the frequency range 0.001 Hz ... 30 MHz ± (3 ... 5) %; Continuous electromagnetic oscillations in the frequency range of 9 kHz ... 17.85 GHz ± (0.5 ... 3) dB 5 and 10 MHz reference frequency signal ± (2·10-11 – 2,4·10-10) Attenuation of electromagnetic oscillations in the frequency range 0 ... 3 GHz ± (0.2 ... 1.4) dB General technical characteristics: The area occupied by the module is 6-12 m2 Weight, not more than 550 kg Power supply voltage from 198 to 242 V with a frequency of (50 ± 0.5) Hz Power consumption, no more than 3000 VA

The software and hardware complex with a set of sensors for physics classrooms is designed to measure physical quantities during demonstration work on various sections of physics, as well as to perform experimental work on physics. The set of units of the measuring system is compatible with a PC, has software with an instruction manual. The sensor kit includes 10 sensors for measuring the following physical quantities: - temperature sensor DTV-1 (measuring range -200C + 1100 S); - air humidity sensor DTV-1 (measuring range 10-100%); - pressure sensor DD-1 (measuring range 0-700 kPa); - acceleration sensor DUIMP-1 (measuring range - 4 – + 4 g); - permanent magnetic field induction sensor DUIMP-1 (- 8 – + 8 Gs); - illumination sensor DSCH-1 (measuring range 1 -60 000 lux); - distance sensor DR-1 (measuring range 0.04 – 4.0 m); - angular velocity sensor DUPUS-1 (remote) (measuring range 0 – 210 0/ c); - rotation angle sensor DUPUS-1 (measuring range ±3600); - flame temperature sensor DTP-1 (measuring range 100 – 11000 S).

The frequency meter is able to work both independently and as part of automated measuring systems with interfaces such as USB or RS-232. Technical specifications Frequency and period of sinusoidal signals (inputs A, B) 0.001 Hz - 300 MHz Frequency and period of video pulse signals (inputs A, B) 0.001 Hz - 300 MHz Frequency of continuous sinusoidal oscillations (input C) (0.3 – 37.5) GHz Pulse duration 10 ns - 1000 s The duration of the front, the decay of the pulses is 5 ns - 100 microseconds Time interval from -1000 to 1000 s Frequency measurement resolution 2x10-10 s/Rng The range of setting the trigger levels (inputs A, B) from minus 2.5 to 2.5 V The error of setting the trigger levels (inputs A, B) ± 0.05 V Input signal level: • for sinusoidal signal (inputs A, B) (0.03 - 10.0) V • for video pulse signal (inputs A, B) (0.1 - 10.0) V • for sinusoidal signal (input C) 50 MW - 5 MW Input resistance • Inputs A, B (50±2.5) ohms; (1±0.1) MOm/100 pF • Input With (50±2.5) ohms Nominal frequency value of the reference quartz oscillator 10 MHz Relative error in the frequency of the quartz oscillator, no more than ± 2x10-7 in 12 months Operating temperature range from minus 10 to 40 °C AC power supply 220 V, 50 Hz Power consumption, not more than 100 VA Overall dimensions, mm 299x136x436,5 Weight, not more than 8.5 kg

Basic properties: Wide frequency range; Sufficiently large output power; High level of suppression of side harmonics of the input signal; Low phase noise value; Relatively simple technical solutions: - synchronization and frequency stabilization, - stabilization and adjustment of the output power level, - implementation of amplitude and frequency modulation modes; Do not require external bias diodes. 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 characteristics Input/output frequency range, GHz 26,78-39,17 / 53,57-78,33 Losses (max.), dB 15 Input power level, dBm 15-21 Unevenness of output power (Rvh. = 20 dBm), dB ± 2.0 The level of parasitic harmonics of the input signal at the output (min.), dBn 20 Output VSWR (max.) 2.0 Connector type: • Input Coax. 2.4/1.0 mm (plug/socket) • Output Waveguide 3,759x1,88 mm (50-75GGo) Overall dimensions, mm 26x20x20 Weight, g 50

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

A high-speed signal limiter amplifier. Designed for use in electronic counting frequency meters. Description: The magnitude of the input signals for selecting the switch input and inverting the signal of the limiter amplifier at a supply voltage of ± 5 V: - logical "0" not more than 0.2 V; - logical "1" at least 4.8 V. The value of the input signals of switching on / off the switch at a supply voltage of ± 5 V: - logical "0" no more than 3.3 V; - logical "1" at least 4.1 V. The magnitude of the output signals of the switch at a supply voltage of ± 5 V and a load of 300 ohms connected to zero potential: - logical "0" from 3.1 V to 3.4 V; - logical "1" from 4.0 V to 4.3 V. The minimum input voltage of the sinusoidal shape in the frequency range from 10 Hz to 200 MHz should be no more than 30 mV. The maximum input voltage of the sinusoidal shape in the frequency range from 10 Hz to 200 MHz must be at least 1 V. The value of the supply voltage: - positive 5±0.2 V; - negative -5±0.2 V. The current consumption should be no more than: - from a positive power source 110 mA; - from a negative power supply 35 mA.

Frequency comparators CHK7-1011 and CHK7-1011/1 can also be used as frequency and time standards with frequency correction based on GLONASS/GPS signals as sources of highly stable signals in various frequency measuring systems. Comparators have a built-in device for processing measurement data based on a microcomputer, which provides statistical processing of the results of frequency and time measurements, and a device for displaying information based on a color TFT display. The built-in diagnostic system allows you to quickly determine the operability and condition of the main comparator devices with information output to the built-in display screen. Comparators are available in three versions and differ in composition and functions performed. Comparators have a basic set of devices (modules), including a frequency comparator, a power supply module and a device for processing and displaying information based on a microcomputer and a color TFT display. The frequency comparator CHK7-1011 has a built-in SRNS receiver and a highly stable rubidium frequency standard Ch1-1014 with the function of correcting the actual frequency value by signals from satellite radio navigation systems GLONASS or GPS. The comparator forms its own time scale with the ability to synchronize on any external time scale received by the SRNS receiver built into the device. The device has two modes for measuring the deviation of the generated time scale: from the time scale of the built-in SRNS receiver and from the external time scale. Information about the current time received from the SRNS receiver is displayed on the comparator display screen, and is also transmitted to the consumer via the RS-485 interface. All the above-mentioned features make the frequency comparator CHK7-1011 a unique measuring device in the field of frequency and time measurements. The frequency comparator CHK7-1011/1 has a highly stable rubidium frequency standard Ch1-1013 and can be used as a frequency and time standard as a source of highly stable signals in various frequency measuring systems. The frequency comparator CHK7-1011/2 does not include any additional devices. To carry out measurements with it, it is necessary to use a highly stable signal of the reference frequency from an external RF or hydrogen frequency standard. For the convenience of users, apart from the keypad, they can also exercise control of the functions of the devices with a mouse-type manipulator included in the delivery package. Comparators provide access to measurement data over an Ethernet network.