GB/T 40023-2021Non-destructive testing instruments—Ultrasonic time-of-flight diffraction instrument—Technical requirements (English PDF)

4.3 Dynamic range

The dynamic range shall not be less than 100 dB.

4.4 Time base linearity error

The time base linearity error shall not be greater than ±0.5%.

4.5 Vertical linearity error

The vertical linearity error shall not be greater than ±2% of the full-screen signal.

4.6 Equivalent input noise

The equivalent input noise shall be less than 100 x 10^-9 V/Hz1/2.

4.7 Transmitted pulse voltage amplitude

The excitation waveform of the transmitted pulse mainly includes sharp pulses, unipolar square wave pulses and bipolar square wave pulses; the voltage amplitude shall be adjustable; the peak-to-peak value shall not be less than 200 V.

4.8 Transmitted pulse rise time

The transmitted pulse rise time is the time for the pulse front amplitude to rise from 10% to 90% of the pulse peak value, which shall be less than 0.25 times the period time of the nominal frequency of the highest possible probe.

4.9 Transmitted pulse duration (pulse width)

The minimum pulse width shall be greater than or equal to half the cycle time of the nominal maximum operating frequency; the maximum pulse width shall be less than or equal to half the cycle time of the nominal minimum operating frequency. The pulse width adjustment step length shall be less than 10% of the target pulse width.

4.10 Transmitted pulse recoil amplitude

The transmitted pulse recoil amplitude shall be less than 4% of the peak-to-peak transmitted pulse voltage.

4.21 Appearance quality

The appearance quality requirements of the instrument shall meet the relevant regulations in Chapter 10 of GB/T 2611-2007.

4.22 Temperature resistance

The temperature resistance performance requirements of the instrument shall meet the relevant regulations in Chapter 3 of GB/T 25480-2010.

4.23 Humidity resistance

The humidity resistance performance requirements of the instrument shall meet the relevant regulations in Chapter 3 of GB/T 25480-2010.

4.24 Anti-vibration

The anti-vibration performance of the instrument shall meet the requirements for group-II instruments that are specified in 4.7 of GB/T 6587-2012.

4.25 Shock resistance

The shock resistance of the instrument shall meet the requirements for group-II instruments that are specified in 4.7 of GB/T 6587-2012.

5.1 Delivery inspection

5.1.1 All the delivered products shall be inspected by the manufacturer's quality inspection department for the delivery inspection items, and issued with the product qualification certificate, before leaving the factory.

5.1.2 The delivery inspection shall be carried out in accordance with the items that are specified in Table 1.

5.2 Type inspection

5.2.1 Type inspection shall be carried out in any of the following situations:

a) Type identification of new products or old products that are transferred to the factory;

b) After formal production, if there are major changes in structure, materials and processes, which may affect product performance;

6.1 Marking

The nameplate of each instrument shall be fixed at the obvious position of the shell; its contents include:

a) Specification, model, number;

b) Manufacturer's name and trademark.

6.2 Packaging

6.2.1 The packaging of the instrument shall comply with the provisions of Chapter 5 in JB/T 6147-2007.

6.2.2 The characters and signs on the outer wall of the packaging box shall be clear, and shall not be blurred due to handling friction. The contents include:

a) Product name;

b) Receiving unit, address and telephone number;

c) Forwarding unit, address and telephone number;

d) The packaging box shall have signs such as "fragile items", "upward", "fear of rain", "no rollover", and comply with the requirements of Table 1 in GB/T 191-2008.

6.2.3 The following documents shall be attached to the package:

a) Product packing list;

b) Product certification;

c) Product manual, which shall be marked with the implementation standard number. […]

6.3 Transportation and storage