Ultrasonic tester UZT-RDM
Ultrasonic tester UZT-RDM is designed for metrological verification, standardization and verification of parameters and characteristics of ultrasonic flaw detectors and thickness gauges, as well as their components, including piezoelectric transducers (PEPs), for compliance with normative and technical documentation during the development, production and operation of devices.
The tester consists of an electronic unit and a set of connecting cables necessary for creating schemes for measuring parameters.
Electronic unit of the tester in the
- radio pulse source with adjustable amplitude, duration, time delay, frequency and number of fill periods, as well as normalized initial phase;
- A digital oscilloscope including a signal amplitude and frequency meter, a spectrum analyzer, a time interval meter and a matrix display;
- PEP excitation pulse generator with a wide bandwidth of frequency spectrum of output signals.
- attenuator
Measurement of parameters of electronic units of flaw detectors and thickness gauges:
- sensitivity of the receiver on the input of the PEP connection;
- the range and absolute error of the receiver gain control;
- range and deviation of the amplitude response of the receiving path from the nominal one;
- adjustment range and absolute error of the attenuator attenuation setting;
- range and error of measurement of signal amplitude ratios at the input and output of the receiver;
- time parameters of signal registration zones in the control channel (delay and duration of zones);
- time parameters of indication zones (light, sound) for automatic defect detectors (ADS) of control channels;
- Amplitude characteristics of multi-threshold signal registration systems;
- amplitude characteristics of multi-threshold ASD indication systems;
- amplitude-temporal parameters of the temporal sensitivity control (TSC) characteristic;
- measuring range and error of built-in time interval meters, including the range and error of the depth measuring device of the electronic unit;
- adjustment range and adjustment error of threshold indicators of ASD systems;
- interference cutoff level;
- parameters of PEP excitation pulse generators on load equivalents;
- the pulse frequency of the flaw detector.
Measurement of PEP parameters:
- Impulse double conversion factor ;
- the operating frequency of the PEEP fuu;
- PEEP input angle;
- location of the entry point marking on the PEP housing;
- is the width of the main lobe of the PEP radiation pattern;
- reverberation-noise characteristics of the PEP;
- time of sound propagation in the prism;
- Normalization and verification of compliance with the unambiguous polarity of piezoelements of transmitting and receiving resonators of separate-coupled thickness-measuring PEPs;
- instantaneous echo impulse values and their deviations from nominal values.
Technical specifications UZT-RDM:
Parameters of the output signal of the radio pulse generator of the tester on a 50 Ohm load (from the spare parts kit):
| Maximum amplitude value, V | at least 2.5 |
| Soft amplitude adjustment range, dB. | at least 20 |
| Ratio of the amplitude of the radio pulse voltage to the interference voltage in the pause between radio pulses, dB. | at least 40 |
| Adjustment range of radio output pulse filling frequency, MHz. | 0.1 to 10 |
| Discreteness of radio pulse filling frequency setting, kHz. | 1 |
| Radio pulse fill frequency setting error. | not more than 0.5% |
| Nonuniformity of the amplitude-frequency response in the frequency range from 0.1 to 10MHz, dB. | max ±1 |
| Number of periods of sinusoidal oscillations in a radio pulse Adjustment discreteness | 1 to 10 |
| Delay of radio pulses relative to synchronization pulses, µs Delay setting range, µs Setting error, µs | 0.5 to 1000 |
The error of measuring the amplitude of the high-frequency signal is not more than 5%.
Tester attenuator parameters:
| Adjustment range of signal attenuation by the tester attenuator, dB. | 0 to 96 |
| Signal attenuation adjustment error by attenuator | not more than ±(0.1 +0.0075 Ah), |
| Input and output resistance of attenuator, Ohm | 50 |
Pulse parameters at the output of the excitation generator of ultrasonic transducers (PEPs) and resonators on a 50 ohm resistor load:
| Pulse amplitude, V | 100±10 |
| Polarity | negative |
| Duration of leading edge, ns | no more than 25 |
Receiver parameters of the tester:
| Maximum sensitivity, µV. | no more than 300 |
| Input signal gain adjustment range, dB. | 0 to 110 |
| Gain control discreteness, dB. | 0,1 |
| Deviations of the gain control characteristic from the linear one not more than, dB, where Ux – set value of gain, dB. | ±(0.5+0.03Uh) |
| Measurement range of the maximum frequency of the spectrum of the signal applied to the receiver input, MHz. | 1.0 to 10 |
| Relative error in measuring the frequency of the signal applied to the receiver input. | no more than 3% |
Synchronization modes of tester operation:
- From internal sync pulses.
- From external sync pulses.
Parameters of pulses fed to the synchronization input of the tester:
| Pulse polarity | positive or negative |
| Frequency within, kHz. | 0.01 to 10 |
| Amplitude within, V. | 4 to 70 |
| Duration at the level of 0.5 of the amplitude value within, µs. | 1 to 10 |
| input resistance of the tester on the external synchronization input, kOhm. | at least 1 |
Parameters of tester output clock pulses :
| Polarity | positive |
| Sequence frequency, Hz | 500±50 |
| Amplitude at 1kOhm load | at least 2.5 V |
Additional features:
| Powering the tester:
|
(50±1) |
| Time to establish the operating mode, minutes. | no more than 15 |
| Weight of the tester: included, kg;
electronic unit, kg. | no more than 5 no more than 3 |
| Overall dimensions: electronic unit, mm; stowage case, mm | max 240x200x110 |