SY/T 5585.3-1993 Test method for electrical parameters of seismic data transmission cable Crosstalk attenuation test SY/T5585.3-1993 Standard download decompression password: www.bzxz.net

Petroleum and Natural Gas Industry Standard of the People's Republic of China SY/T 5585.3—93
Test Methods for Electrical Parameters of Seismic Data Transmission Cables
Crosstalk Attenuation Test
Published on March 27, 1993
Ministry of Energy of the People's Republic of China
Implemented on September 1, 1993
Subject Content and Scope of Application
Petroleum and Natural Gas Industry Standard of the People's Republic of China Test Methods for Electrical Parameters of Seismic Data Transmission Cables
Crosstalk Attenuation Test
This standard specifies the test method for the electrical parameter of seismic data transmission cables - crosstalk attenuation.
SY/T 5585.3--93
This standard is applicable to the network analysis method, level difference method, and pulse method to test the near-end crosstalk attenuation, far-end crosstalk attenuation or far-end crosstalk defense between pairs of manufacturing length seismic data transmission cables. Reference Standards
SY/T5585.1 "Test Method for Electrical Parameters of Seismic Data Transmission Cable Characteristic Impedance and Propagation Time Test" 3
Test Principle and Test Equipment
ST(50/11G)
Figure 1: Network Analysis Method for Testing Near-End Crosstalk Attenuation B. Wiring Diagram NA - Network Analyzer; DCR One Directional Coupler: STI, ST, - Impedance Transformer: CI, C. Auxiliary Cable: SDTC - Seismic Data Transmission Cable Pair: Art, Z - Equal to the Characteristic Impedance of the Main and Stringed Cables, Respectively Approved by the Ministry of Energy of the People's Republic of China on March 27, 1993, and Implemented on September 1, 1993
3.1 Test Principle Wiring Diagram
SY/T 5585.3- 93
Network analysis method to test near-end crosstalk and far-end crosstalk attenuation wiring diagram as shown in Figure 1 and Figure 2. 3.1.1
ST.50/110X
ST2(110/50)
Figure 2 Network analysis method to test far-end crosstalk attenuation B wiring diagram T2
NA-network analyzer, DCR-a directional coupler, STi, ST-impedance transformer, Ci, C. a coaxial cable, SDTC-seismic data transmission cable line pair: Z, 7-equal to the main string, the string line pair characteristic impedance 3.1.2 Level difference method to test near-end crosstalk attenuation B. And far-end crosstalk defense degree B, wiring, as shown in Figure 3, Figure 4. ST
Level difference method to test near-end crosstalk attenuation B. Wiring diagram G-level oscillator: D-frequency level meter, ST:, ST2-impedance transformer, Z1, Z2-equal to the main string, the string pair characteristic impedance 2
SY/T5585.3--93bzxz.net
STat Z-:?Zin)
Level difference method to test the far-end crosstalk attenuation defense degree B wiring diagram Figure 4
G-level oscillator, the output impedance is Z.
D-frequency level meter, the input impedance is ZteST, ST impedance transformer;
Z1, Z2-equal to the main string, the string pair characteristic impedance 3.1.3 Pulse method to measure the near-end and far-end crosstalk attenuation Bo, B1 wiring diagram, as shown in Figure 5. A/DI
Single-shot pulse generator
Pitch circuit
SDTCTR
Figure 5 Pulse method to test near-end and far-end crosstalk attenuation Bc1B Wiring diagram SDTCTR-pool shock digital cable tester, ZI, Z.- are equal to the main and neutral line pair characteristic impedance respectively. 2 Test equipment
3.2.1 See SY/T5585.1 Sections 3.2.1 to 3.2.8. Zin
SY/T5585.3-93
3.2.2 When the tested line pair is not connected, the crosstalk attenuation of the entire test system should be 20dB higher than the minimum crosstalk attenuation value of the tested line pair. 3.2.3 The load resistance connected to the terminals of the main and neutral line pairs should be equal to the corresponding line pair characteristic impedance, and its deviation should not exceed 5% of the line characteristic impedance modulus.
4 Sample preparation
The sample is the finished cable of manufacturing length or in accordance with relevant regulations. 5 Test steps
5.1 Network analysis method
5.1.1 Connect the test system according to Figures 1 and 2. Use the S parameter function in the S:1 (T, /R1) state to perform routine calibration in the frequency range of 100kHz~100MH2.
5.1.2 Connect the wires according to Figure 1 to test the near-end crosstalk attenuation. 5.1.3 Connect the wires according to Figure 2 to test the far-end crosstalk attenuation. 5.2 Level difference method
5.2.1 Connect the test system according to Figures 3 and 4. Use coaxial leads to connect the asymmetric ends of the two impedance transformers to the instrument respectively, and connect the symmetrical ends of the two impedance transformers to each other to check the correctness of the transformer selection and whether the connections are in good contact. 5.2.2 Adjust the oscillator output level so that the meter reading is the minimum (b). 5.2.3 Disconnect the symmetrical ends of the two impedance transformers connected to each other, and connect them to well-shielded load resistors respectively, and check the crosstalk attenuation of the system according to the requirements of Article 3.2.2.
5.2.4 Connect the test system to the tested line pair according to Figures 3 and 4, and record the reading of the electric semi-meter 65.3 Pulse method
The single raised cosine wave pulse generator of the seismic data transmission cable tester outputs a pulse, and the A value is read from A/D converter 1. A/D converter 2 reads A206 at points a, b and points c, d respectively. Calculation of test results
6.1 Network analysis method
Use a network analyzer to print the data and graphs of the near-end sound attenuation value B. and the far-end crosstalk attenuation value B. 6.2 Level method
6.2.1 Calculate the near-end crosstalk attenuation between line pairs according to formula (1): Bn--bn
Where ——the level meter reading during calibration, dBb.——the level meter reading during testing, dB. 6.2.2 Calculate the far-end crosstalk attenuation between line pairs according to formula (2): Bi-b,-b,-a
Where 1 is the working attenuation value of the measured line pair, dB. 6.3 Pulse method
6.3.1 Calculate the near-end crosstalk attenuation value according to formula (3): Ba=201g(-12:/A1)
Where A21 is the value read by the A/D converter at the near end. 6.3.2 Calculate the far-end crosstalk attenuation value according to formula (4): Bor-201g(A23/A,)
Where A22-A/D converter reads the value at the far end. 4
Additional remarks:
SY/T 5585.3-93
This standard is proposed and approved by the Professional Standardization Committee of Petroleum Exploration and Development Instruments. This standard was drafted by Xi'an Petroleum Institute, Xi'an Petroleum Exploration Instrument Factory, Geophysical Exploration Instrument Company, Xi'an Institute of Geology and other units.
This standard was drafted by Hou Jiao, Ma Runmin, Zhang Yong5
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