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1、 _ _ - -_I .- - J I S Z*235L 72 4733608 0537806 688 UDC 620.1 79.1 6:53.089.5 1 e JIS . JAPANESE INDUSTRIAL STANDARD Method for assessing the electrical characteristics of ultrasonic testing instrument using pulse echo technique Translated and Published by Japanese Standards Association Printed in J
2、apan 18 S Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 19:53:12 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S Z*2351 92 4933608 0517807 514 1 a In the e
3、vent of any doubt arising, the original Standard in Japanese is to be final authority. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 19:53:12 MDTNo reproduction or networking permitted wi
4、thout license from IHS -,-,- - - _ _ _ JIS Z*235L 92 = 4933608 0537808 450 UJX 620.179.6:53.089.5 JAPANESE INDUSTRIAL STANDARD J I S Method for assessing the electrical characteristics of ultrasonic testing instrument using puise echo technique Z 2351-1992 1 . Scope This Japanese Industrial Standard
5、 specifies the method for assessing the electrical characteristics of ultrasonic testing instrument that is manually operated, and is provided with a display unit using the puise echo technique, at the time of manufacture using electronic measuring instruments. Remarks: The following standard is cit
6、ed in this Standard. JIS Z 2300 Glossary of terms used in nondestructive testing 2. Definitions For the purpose of this Standard, the definitions given in JIS Z 2300 apply. 3. Assessment items on performance 3.1 General items The general items on performance assessment of ultrasonic testing instrume
7、nts shall be as follows: (1) The performance of transmitter part shall be measured by 4.1. ( 2 ) The performance of receiver part shall be measured by 4.2. ( 3 ) The performance of time base part shall be measured by 4.3. ( 4 ) The time resolution shall be measured by 4.4. ( 5 ) The performance of d
8、istance amplitude compensation circuit shall be measured by 4.5. (6) The performance of gate circuits shall be measured by 4.6. 3.2 Items on principal performance The items on principal performance that must always be measured shall be as follows. The assessment items other than the principal items,
9、 their contents and ranges shall be subject to the agreement between the parties concerned with delivery. (1) The items for transmitter part are specified in 4.1.1, 4.1.2, 4.1.3, and 4.1.5. ( 2 ) The items for receiver part are specified in 4.2.1, 4.2.2, 4.2.4, and 4.2.6. ( 3 ) The items for time ba
10、se part are specified in 4.3.1, 4.3.2 and 4.3.3. ( 4 ) The item for time resolution is specified in 4.4. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 19:53:12 MDTNo reproduction or netwo
11、rking permitted without license from IHS -,-,- J I S Z*Z353 72 Li933608 0537809 377 W 2 Z 235 1-199 2 4 . Methods of performance assessment 4.1 Performance of transmitter part 4 . 1 . 1 Effective output impedance The effective output impedance of transmitter part shall be measured as follows. (1) Ap
12、paratus (a) Oscilloscope The frequency shall be 100 MHz or over, and the apparatus shall be calibrated before use. (b) Terminating resistor The resistor shall be 50 ohms of non- inductive. ( 2 ) Measurement method (2.1) Open the output terminal T of the transmitter part of the ultrasonic testing ins
13、trument as shown in Fig. 1, measure the voltage with an oscilloscope, and record it as V,. (2.2) Connect the terminating resistor Ra to the output terminal T as shown in Fig. 2 , measure the voltage of the transmitted pulse across the terminal with an oscilloscope, and record it as V,. Fig. 1. Measu
14、rement of transmitted Fig. 2. Measurement of transmitted pulse voltage when output terminal is opened pulse voltage when output terminal is terminated Transmitter part output terminal Oscilloscope Terminating resistor Ultrasonic testing Ultrasonic testing instrument instrument (2.3) Measure the volt
15、age at zero and the peak value. (2.4) If the instrument is provided with a pulse energy adjustor, measure at energy (high) and (low). If the impedance is different, measure at each impedance. (2.5) Obtain output impedance Z, (fi) of the transmitter part by the following formula. where, Ro : terminat
16、ing resistor value (fi) V, : pulse voltage when output terminal is opened (VI V, : pulse voltage when output terminal is terminated (VI . Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 19:
17、53:12 MDTNo reproduction or networking permitted without license from IHS -,-,- . Ultrasonic testing instrument 3 2 2351-1992 Frequency counter Protection circuit 4.1.2 Repetition frequency The repetition frequency of transmitted pulse shall be measured as follows. (1) Apparatus Apparatus shall be t
18、he same as for 4.1.1 except the follows. (a) Frequency counter The input frequency shall be 1 M H z or over, and the number of display digits shall be 6 or more. (b) Protection circuit This circuit is t o protect the input circuit of the frequency counter against the high voltage of transmitted puls
19、e, providing attenuation of 20 t o 40 dB. (2) Measurement method Setup of the ultrasonic testing instrument and the apparatus shall be as shown i n Fig. 2 when an oscilloscope is used for measurement, and as shown i n Fig. 3 when a counter is used for measurement. Fig. 3. Setup for measuring the rep
20、etition frequency Display two or more transmitted pulses on the cathode ray tube (hereafter referred t o as the CRT) of the oscilloscope. time interval T between two adjacent pulses, Measure the As for the ultrasonic testing instrument provided with an independent setting function of the pulse repet
21、ition frequency, measure the relation between the control position at the lowest and highest frequencies, and the repetition frequency as t o the function of the instrument. Observe the change i n the amplitude of transmitted pulse when the pulse repetition frequency has been changed. The pulse repe
22、tition frequency shall be obtained by the following formula. where, PRF : pulse repetition frequency (Hz) T : t i m e interval of transmitted pulses(s) R i s e t i m e of transmitted pulse The rise t i m e of the transmitted shall be measured as follows. (1) Apparatus The apparatus shall be the same
23、 as for 4.1.1. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 19:53:12 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S ZU2351 92 m 4933608 0537833 T45 m 4 Z
24、 2351-1992 (2) Measurement method (2.1) Setup of the ultrasonic testing instrument and apparatus is shown in Fig. 2. (2.2) Display a transmitted pulse on the CRT of the oscilloscope. (2.3) As shown in Fig. 4 , observe the leading edge of the transmitted pulse, and measure the time TR between 10 % an
25、d 90 % of the maximum value of transmitted pulse. Fig. 4. Measurement of rise time of transmitted pulse (a) For positive pulse (b) For negative pulse II (2.4) If this time is influenced by the adjustment of pulse energy, measure this time under pulse energy controls set at the maximum and minimum. 4
26、 . 1 . 4 Duration of transmitted pulse shall be measured as follows. The duration of the transmitted pulse (1) Apparatus The apparatus shall be the same as for 4 . 1 . 1 . (2 Measurement method (2.1) Setup of the ultrasonic testing instrument and apparatus is shown in Fig. 2. (2.2) Display a transmi
27、tted pulse on the CRT of the oscilloscope. (2.3) As shown in Fig. 5, measure the duration of the interval Kv between the leading edge and trailing edge at which the value of a transmitted pulse reaches 10 % of its peak amplitude. Fig. 5 . Measurement of transmitted pulse duration 10% 100 % Copyright
28、 Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 19:53:12 MDTNo reproduction or networking permitted without license from IHS -,-,- JIS Z*2351 92 W 4933608 0517812 981 5 Z 2351-1992 4.1.5 transmitted
29、 pulse shall be measured as follows. Measurement of amplitude of transmitted pulse The amplitude of the (1) Apparatus The apparatus shall be the same as for 4.1.1. ( 2 ) Measurement method (2.1) Setup of the ultrasonic testing instrument and apparatus is shown in Fig. 2. (2.2) Display a transmitted
30、pulse on the CRT of the oscilloscope. (2.3) Measure the amplitude of the transmitted pulse across zero level and peak level in volt (VI. If the amplitude is changed by the function capable of adjusting the pulse energy, measure the amplitude under pulse energy controls set at the maximum and minimum
31、. (2.4) 4.2 Performance of receiver part 4.2.1 equivalent input noise levels) Sensitivity (The sensitivity is given by reference output level and Sensitivity is measured by as follows. (1) Apparatus (1.1) Pulse generator The pulse generator is provided with the function capable of setting back the o
32、utput pulse freely by 3 ps or more immediately after the trailing edge of the transmitted pulse. (1.2) Burst wave signal generator The burst wave signal generator is provided with the function capable of generating optional frequency and number of woves by receiving trigger signals from the pulse ge
33、nerator. (1.3) Oscilloscope The frequency shall be 100 MHz or over, and the apparatus shall be calibrated before use. (1.4) External attenuator The external attenuator shall meet the following requirements. (a) Operating frequency range DC to 100 M H z or over (b) Attenuation range O to 80 dB or ove
34、r, variable in 0.2 dB steps (c) Impedance 50 G (d) Accuracy Within - + 0.2 dB per 20 dB (1.5) Terminating resistor 50 s2 non-reactance resistor (2) Measurement method (2.1) Setup of the ultrasonic testing instrument and the apparatus for sensitivity measurement is shown in Fig. 6 . Copyright Japanes
35、e Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 19:53:12 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S Z*2353 92 4933608 0517813 818 Ultrasonic testing instrument 6 2 2351-
36、1992 Transmitted output terminai Protect ion * Pulse generator * circuit L A Received input terminal Oscilloscope Synchronous signal Separate the receiver part from transmitter part by setting the selector of the ultrasonic testing instrument to “double probe“. Terminating External 4 resistor attenu
37、ator As shown in Fig. 6 , apply the transmitted pulse to the pulse generator through the protection circuit for protecting its input circuit from excessive voltage of the transmitted pulse and adjust the burst wave signal generator so as to synchronously generate its signals sufficiently delayed fro
38、m transmitted pulse with the signals from the pulse generator. wave signal generator to the input terminal of receiver part of the ultrasonic testing instrument through the external attenuator and the terminating resistor of 50 ohm. Apply the output signals from the burst Burst wave signal generator
39、 The rejection control of ultrasonic testing instrument shall be set to W I 0 “ or I , O F F “ . Set the frequency of burst wave signal generator with center frequency of receiving band (or test frequency), and with wave number of 20. Measurement procedures shall be as follows. (a) Attach a hood ove
40、r the CRT of the oscilloscope and lower the repetition frequency to make waveforms easier to be seen. (b) Set the output level of the burst wave signal generator, as shown in Fig. 7 ( a ) , to 1 v - on the oscilloscope. Set the value of the external attenuator to 60 dB (ref. 1 Vp:p-p -60 d B ) . Cop
41、yright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 19:53:12 MDTNo reproduction or networking permitted without license from IHS -,-,- 7 Z 2351-1992 Fig. 7. Signal level (a) Burst wave output (b)
42、Noise of receiver (c) Adjust the height of the burst wave signals on the display to 50 % of full scale of the graticule by gain controls of the ultrasonic testing instrument and read the value of the gain control as A dB. wave to read the signal height on the display. Use the part of constant amplit
43、ude of the burst (d) Disconnect the external attenuator from the terminating resistor. Adjust the gain controls under the condition that only the terminating resistor is connected to the input terminal of receiver part of the ultrasonic testing instrument to make the noise level on the display 50 %
44、and read the value of gain control as N dB. In case that noise level does not reach to 50 % even when gain controls are maximized, read the noist level height as rrt % as shown in Fig. 7 (b) and the corresponding gain controls value M dB. (2.6) Obtain the sensitivity S dB of the receiver of the ultr
45、asonic testing instrument by the following formula. or S=20 10g(50/.1vl) f M - A f 6 0 where, N : gain controls value (dB) when receiver noise is set to 50 % height on the display A : gain controls value (dB) when burst wave signal is set to 50 % height on the display M : gain controls value (dB) wh
46、en receiver noise is set to in % height on the display m : height of receiver noise on the display 4.2.2 Gain controls (1) Apparatus The gain controls shall be measured as follows. The apparatus shall be.the same as for 4.2.1 (1). Copyright Japanese Standards Association Provided by IHS under licens
47、e with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 19:53:12 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S Z*:2351 92 m 4933608 0517815 690 m _ _ _ 1 . 0 2.0 8 Z 2351-1992 2 4 ( 2 ) Measurement method (2.1) Setup of the ultrason
48、ic testing instrument and the apparatus is shown in Fig. 6 . The arrangement of the instrument and apparatus is the same as 4.2.1 (2.2) to (2.4). (2.2) Measurement procedures shall be as follows. (a) If the ultrasonic testing instrument is provided with a band-pass filter, the frequency of the burst wave signal shall be the central frequency of receiving band (or test frequency). (b) Maximize the gain controls of ultrasonic testing instrument. Adjust the gain controls so that th