SY/T 5585.2-1993 Test method for electrical parameters of seismic data transmission cable Working attenuation test SY/T5585.2-1993 Standard download decompression password: www.bzxz.net

SY/T5585.2—93, Petroleum and Natural Gas Industry Standard of the People's Republic of China
Test Methods for Electrical Parameters of Seismic Data Transmission Cable
Working Attenuation Test
Published on March 27, 1993
Ministry of Energy of the People's Republic of China
Implemented on September 1, 1993
Standard of Petroleum and Natural Gas Industry of the People's Republic of China SY/T 5585.2—93
Test Methods for Electrical Parameters of Seismic Data Transmission CableWorking Attenuation TestSubject Content and Scope of Application
This standard specifies the test method for the electrical parameters of seismic data transmission cable - working attenuation.
This standard is applicable to the network analysis method, the differential method, and the pulse method to test the working attenuation of the manufacturing length seismic data transmission cable. 2 Reference standards
2.1SY/T5585.1--92 "Electrical parameter test method for seismic data transmission cable: characteristic impedance and propagation time test" 3
Test principle and test equipment
STi(50/110)
Figure 1 Network analysis method test α, wiring diagram
ST2(110/50)
NA—network analyzer, DCR—directional coupler, Ct, C-coaxial cable: ST1, ST:—impedance variable; SDTC-seismic data transmission cable pair, Z1, Z—load resistance, respectively equal to the characteristic impedance of the line pair being tested 3.1 Test principle
3.1.1 Network disconnection method test working attenuation a wiring, as shown in Figure 1. Approved by the Ministry of Energy of the People's Republic of China on March 27, 1993 and implemented on September 1, 1993
SY/T5585.2—93
3.1.2 Level difference method to test the working attenuation α1 wiring, as shown in Figure 2. 3.1.3 Pulse method to test the working attenuation α1 wiring, as shown in Figure 3. 0
3.2 Test equipmentbzxZ.net
SY/T 5585.2—93
For the performance requirements of the test equipment, see SY/T5585.1, Sections 3.2.1 to 3.2.8. 4 Sample preparation
The sample is a finished cable of a length or in accordance with relevant regulations. 5 Test steps
5.1 Network analysis method
5.1.1 Connect the test system as shown in Figure 1 and use the S parameter function S21 (T/R,) to perform a band gauge calibration in the frequency range of 100kHz to 100MHz.
5.1.2 Connect the measured line pair between the two impedance transformers, and connect a load resistor with the same modulus as the measured line pair's characteristic impedance. The deviation should not exceed ±5%.
5.1,3 After the above work is completed, the test can be carried out. 5.2 Level difference method
5.2.1 Connect the test system as shown in Figure 2, check the correctness of the meter's frequency selection, and whether the various connectors are in good contact. 5.2.2 Remove the measured line pair, connect the symmetrical ends of the two impedance transformers to each other, and adjust the oscillator output voltage to make the level meter reading the minimum (b.).
5.2.3 Disconnect the symmetrical ends of the two impedance transformers, connect the measured line pair as shown in Figure 2, and record the level meter reading 6:. 5.3 Pulse method
5.3.1 Connect the test system as shown in Figure 4. Put the characteristic impedance value measured in accordance with Article 5.3 of SY/T5585.1 into the balance network. 5.3.2 The single raised cosine pulse generator outputs a raised cosine pulse with a half-width of 125ns. The value A1 is read from A/D converter 1 and the value A is read from A/D converter 2.
6 Test results and calculations
6.1 Network analysis method
The network analyzer prints the data and graphs of the working attenuation value a and the propagation time △t. 6.2 Difference method
Use (1) to calculate the working attenuation value of the measured line pair: α1=b,-b.
Where h. —Level meter reading during calibration, dB—Level meter reading during test, dB.
6.3 Pulse method
Calculate the working attenuation value A of the measured line pair according to formula (2).
a=20lg-A.
Where α1——line pair working attenuation, dB, 41, A:——A/D converter reading value.
Note the following items
7.1 When testing by network analysis method or pulse method, analyze the graph output by computer or observe with oscilloscope. If there is oscillation in the measured line pair, stop testing the cable.
7.2 The test methods specified in this standard have the same validity. 8
Additional explanation:
SY/T5585.2—93
This standard is proposed and managed 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.
The drafting persons in charge of this standard are Yang Dexiang and Zhang Runzhi. 4
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