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The device successfully combines simplicity of design, modern design, convenience, clarity of control and obtaining information about the measured physical quantity. 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 Carrier frequency of a continuous radio pulse sequence (IM) signal (input C) Fn = (0.3-37.5) GHz, from 0.3 microseconds to 1ms, Fsl from 100 Hz to 1 MHz, from 2 to 103 Frequency ratio (inputs A, B) from 1 to 3x109 Pulse duration 5 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 Phase difference of two synchronous sinusoidal signals from minus 180° to 180° The measurement error of the phase difference of two synchronous sinusoidal signals is ± 2.3 ° at a signal amplitude of 1 V Setting range of trigger levels (inputs A, B) from - 2.0 to 2.0 V The error of setting the trigger levels (inputs A, B) ± 0.01 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 a sinusoidal signal (input C) 0.1 - 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 24 months Operating temperature range from minus 10 to 50 °C AC power supply 220 V, 50 Hz Power consumption, not more than 100 VA Overall dimensions, mm 306x129.5x430.6 Weight, not more than 8.5 kg

Designed for measuring the frequency and period of sinusoidal and pulse signals, measuring pulse duration, time intervals, pulse duty cycle, frequency ratio of electrical signals, counting the number of pulses, output of reference frequency signals. Technical specifications: Input to (sinusoidal signal) - range 100 - 2500 MHz Input A, C (sine, pulse) - range 0.01 - 200 MHz Counting time: input A, C – 1, 10, 102, 103, 104 ms; login to – (16•1), (16•10), (16•102), (16•103), (16•104) ms The number of averages. the period of the. vx. signal - 1, 10, 102, 103, 104 Timestamp period – 10-7, 10-6, 10-5, 10-4, 10-3 Borehole measurement at inputs A, C – 1.000001- 999999999 Frequency ratio in channels: A/S and C/A - 0.0001- 999999999; B/S - 0.5 – 999999999 Quartz thermostatic generator The nominal frequency value is 5 MHz Error: ± 5•10-8 - for 30 days, ± 10-7 - for 12 months 9 decimal places Overall dimensions (HXHL) - 285x106x345 mm Weight: 4 kg Reference generator: 1x10-7 for 12 months. Operating conditions: - 10° C ... +50° C

The frequency meter is capable of operating both autonomously and as part of automated measuring systems with interfaces such as BUSB, RS-232, ETNET and IEEE-488 (CPC). 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) (37.5 – 78.33) GHz Pulse duration 5 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 Setting range of trigger levels (inputs A, B) from -2 to 2 V The error of setting the trigger levels (inputs A, B) ± 0.01 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 a sinusoidal signal (input C) 0.5 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 24 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 299x130,5x433 Weight, not more than 8.5 kg

Designed for measuring the frequency and period of sinusoidal and pulse signals, measuring pulse duration, time intervals, pulse duty cycle, frequency ratio of electrical signals, counting the number of pulses, output of reference frequency signals. Technical specifications: Input to (sinusoidal signal) - range 100 - 3200 MHz Input A, C (sine, pulse) - range 0.01 - 200 MHz The number of averages. the period of the input signal is 1 ... 105 Borehole measurement by inputs – 1.000001- 999999999 Frequency ratio in channels: A/S, C/A, B/C and B/A - up to 999999999 Quartz thermostatic generator The nominal frequency value is 5 MHz Error: ± 2•10-8 - in 30 days, ± 5•10-8 - in 12 months Overall dimensions (HXHL) - 345x285x106 mm Weight: 4 kg Reference generator: ±5x10-8 for 12 months. Operating conditions: - 10° C ... +50° C

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 - 150 MHz Frequency of video pulse signals (inputs A, B) 0.001 Hz - 100 MHz Frequency of continuous sinusoidal oscillations (input C) (0.1 - 1) GHz Frequency of continuous sinusoidal oscillations (input D) (1 - 37.5) GHz Carrier frequency of a continuous signal with frequency modulation (FM) (input D) Fh = (1 - 18) GHz, Fm = 100 Hz-100 kHz; frequency deviation from 10 kHz to 10 MHz Carrier frequency of a continuous signal with amplitude modulation (AM) (input D) Fh = (1 - 18) GHz, Fm = 100 Hz - 100 kHz; AM factor up to 100% Carrier frequency of a continuous radio pulse sequence (IM) signal (input D) Fn = (1-37.5) GHz, from 0.15 microseconds to 1ms, Fsl from 100 Hz to 3 MHz, from 2 to 103 Pulse duration 10 ns – 0.1 s Time interval from -10 to 10 s The duration of the front, the decay of the pulses is 5 ns - 100 microseconds Phase difference of two synchronous sinusoidal signals from minus 360° to 360° The measurement error of the phase difference of two synchronous sinusoidal signals is ± 0.36° (from 1 kHz to 1 MHz) ± 3.6° (above 1 MHz) Input signal level: •for sinusoidal signal (inputs A, B) (0.03 - 7.0) V •for video pulse signal (inputs A, B) (0.1 - 10.0) V •for a sinusoidal signal (input C) (0.03 - 1.0) V •for sinusoidal and IM signals (input D) 10 MW (from 1 to 8 GHz); 40 MW (sv. 8 to 18 GHz); 50 MW (sv. 18 to 37.5 GHz). The nominal frequency value of the reference quartz oscillator is 10 MHz Relative error in the frequency of the quartz oscillator, no more than ± 2x10-7 in 12 months Operating temperature range from 5 to 40 °C AC power supply 220 V, 50 Hz Power consumption, no more than 100 VhA Overall dimensions, mm 496x174x459 Weight, not more than 16 kg

The frequency meter is capable of operating both independently and as part of automated measuring systems with an interface such as USB, RS-232 or IEEE-488 (CPC). Technical specifications Frequency and period of sinusoidal and video pulse signals (input A) 0.005 Hz - 100 MHz Frequency of sinusoidal and video pulse signals (input to) 0.01 Hz - 100 MHz Frequency of continuous sinusoidal oscillations (input C) (0.1 - 1) GHz Frequency of continuous sinusoidal oscillations (input D) (0.6 - 17.85) GHz Pulse duration 10 ns - 10000 s The duration of the front, the decay of the pulses is 5 ns - 100 microseconds Time interval from 0 to 10000 s The frequency ratio of the two signals is up to 109 The average value of the carrier frequency of the pulse-modulated (IM) signal (input D) (0.6 - 17.85) GHz Frequency measurement resolution 2x10-10 s/Rng Phase difference of two synchronous sinusoidal signals from minus 180° to 180° Measurement error of the phase difference of two synchronous sinusoidal signals ± 0.36° (from 1 kHz to 1 MHz)±3.6° (above 1 MHz) Input signal level: •for sinusoidal signal (inputs A, B) (0.03 - 7.0) V •for video pulse signal (inputs A, B) (0.1 - 10.0) V •for a sinusoidal signal (input C) (0.03 - 1.0) V •for sinusoidal and IM signals (input D) 30 MW - 5 MW Input resistance •Inputs A, B (50±2.5) ohms; (1±0.1) MOm/100 pF •inputs C, D (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 50 °C AC power supply 220 V, 50 Hz; 220 V, 400 Hz Power consumption, no more than 50 VA Overall dimensions, mm 229x136x435.5 Weight, not more than 7.5 kg

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

Designed to measure the frequency or single and averaged period of sinusoidal and pulse signals, as well as to measure the pulse duration and frequency ratio, with a guaranteed measurement error of up to 10-7za year. Description: Ch3-81 (inputs A, B, C) – range 0.1 Hz–2.5 GHz Ch3-81/1 (inputs A, B) – range 0.1 Hz–200 MHz Frequency measurement, frequency ratios Measurement of the period, duration of 1 microsecond–10000 s Signal level 30 mV–10 V (eff.), pulse up to 30 V Thermostated quartz 5 MHz: ±10-7 (year) ±7.5X10-9(day) Frequency temperature departure: ±2.5X10-8 (+5...+40 °C) Number of averaged periods: 1-104 Timestamps 10-7-10-3 s RS-232 interface 8-bit SD indicator Dimensions, weight 80X220X300 mm, 3 kg Power supply: ~ 220V, 20V