This standard specifies the basic composition, main technical conditions, test methods and acceptance rules of instruments used for seismic exploration in mines, as well as the marking, packaging, transportation and storage of products. This standard applies to mine seismic exploration instruments. MT 470-1996 Mine Seismic Exploration Instrument MT470-1996 Standard download decompression password: www.bzxz.net

Coal Industry Standard of the People's Republic of China
Mine Seismic Exploration Instrument
Subject Content and Scope of Application
MT 470-
—1996
This standard specifies the basic composition, main technical conditions, test methods and acceptance rules of instruments used for geotechnical exploration in mines, as well as the marking, packaging, transportation and storage of products. This standard applies to mine seismic exploration instruments. 2 Referenced Standards
GB11933.1 Terminology of Geological Instruments General Terminology GB11933.4 Terminology of Geological Instruments Terminology of Geotechnical Exploration Instruments GB 191
Packaging, Storage and Transportation Pictorial Marking
GB3836
Explosion-proof Electrical Equipment for Explosive Atmospheres
GB4208
Classification of Enclosure Protection Grades
GB6592 General Provisions for Errors of Electronic Measuring Instruments Procedure for Reliability Assessment of Instruments
ZBY 321
ZBY003
Technical conditions for packaging and transportation of instruments
ZBD82005 Basic safety requirements for geological instruments ZBD82002 General technical conditions for packaging of geological instruments DZ29 Basic environmental test conditions and methods for transportation packaging of geological instruments General rules for environmental testing of transportation packaging DZ30 Quality inspection rules for geological instruments JB/DQZD133.1~~9 Guidelines for the preparation of drawings and technical documents for electrical products SJ/29001 Basic environmental testing procedures Part 2 3 Product classification and numbering
3.1 Mine sac exploration instruments, numbered by enterprise type a.
System layout structure system category,
Transportation method category;
Underground use residence time category;
d. System function level category.
The above four factors can be used to describe the use and performance characteristics of the instrument. For explosion-proof type and explosion-proof level, each unit can number it according to the enterprise standard.
3.2 Code
The code indicating the characteristics of mine ground explosion device is composed of the characteristic letters KDZ and four decimal digits, as follows: Approved by the Ministry of Coal Industry of the People's Republic of China on April 1, 1996 and implemented on September 1, 1996
First characteristic digit
Second characteristic digit
Third characteristic digit
Fourth characteristic digit
MT 470-1996
-Item d above
Item c above
Item b above
Item a above
See Table 4 for the meaning of characteristic numerals
See Table 3 for the meaning of characteristic numerals
See Table 2 for the meaning of characteristic numerals
See Table 1 for the meaning of characteristic numerals
Brief description of the classification represented by the first characteristic numeral in Table 1
Centralized system
Separated system
Remote control system
Analog unit, control unit, recording or processing unit in one physical bodyAnalog unit, control unit, recording or processing unit in several physical bodiesThe simulation and acquisition part of one or several signals is in one physical body, forming one unit.The recording and processing system is in another physical body, controlling the work of one or more units. The seismic data signal and control signal are transmitted in digital form between the simulation, acquisition part and the recording and processing system. Classification represented by the second characteristic numeral
Brief description
Portable
Transportable
Permanent
Brief description
Handy
Replacement
Permanent
All physical bodies of the instrument system can be carried conveniently
Several or all physical bodies of the instrument system must be transported and moved by transportation tools. The instrument system does not move during use
Classification represented by the third characteristic numeral
Portable, used within one shift
And used within 48 h, and placed in a selected place for use. The underground use time is within 48h to 6d or not placed in a selected place for use. The instrument is permanently stationed in the mine and in a certain working position during its normal working life. Table 4. Classification represented by the fourth characteristic number. Brief description
Analog type
Digital type
Self-test type
On-site processing type
Analog signal acquisition, recording and display
Has analog-digital conversion, records digital quantity, has its own function detection status test index test, has a certain degree of on-site signal processing capability.
4 Basic components of the instrument
4.1 Host part
4.1.1 Analog unit.
4.1.2 Control unit.
MT 470-1996
4.1.3 Recording unit: a functional body capable of storing and exchanging information. 4.1.4 Processing unit: a functional body capable of performing instrument index test calculations and a certain degree of signal processing and analysis. 4.1.5 Power supply system.
4.2 Supporting parts
4.2.1 Detector.
Transmission line.
Cover switch.
Remote detonation (or wire-controlled detonation) and trigger system. 4.2.5
Communication system.
Others.
5 Main technical indicators
5.1 Performance indicators
5.1.1 Sampling interval: ≤2ms, or as specified by product standards. 5. 1. 2
Number of acquisition channels: as specified by product standards.
Preamplifier gain: ≥20dB.
Filter: as specified by product standards.
Notch filter: 49～51Hz, -40dB.
IFP function: as specified by product standards.
Main amplifier gain: specified by product standards.
A/D speed: specified by product standards.
A/D bit number: ≥8.
Display mode: specified by product standards.
Human-machine interaction mode: standard keyboard, function keyboard; voice or other. specified by product standards. Storage capacity: specified by product standards.
Record length: specified by product standards.
Trigger delay or pre-trigger: ±1s.
Record format: save to disk SEG-2 save to tape SEG-Y, D, C5.1.16
Acquisition parameter management: specified by product standards. Acquisition work control mode: specified by product standards. System connection test: specified by product standards. System function test: specified by product standards. System index test: specified by product standards. On-site processing capability: specified by product standards. Maximum transmission distance: specified by product standards. Transmission rate: specified by product standards.
Transportation method: specified by product standards.
Storage temperature: -20～+60℃.
Working environment temperature: 0～+40℃.
Relative humidity: 95%.
MT 470--1996
Explosion-proof type and level: specified by product standards. Continuous working time:
Convenience type>6 h;
Temporary type 6h intermittent 48h;
Permanent type ≥48h intermittent six days and nights;
Permanent type works continuously within the life of the instrument. Power supply voltage and current: specified by product standards. Minimum signal: 1μV. wwW.bzxz.Net
Maximum signal: 1V.
Total weight and split weight: Split weight <50kg. Total weight specified by product standards.
5.2 Test indicators
5.2.1A/D converter linearity: specified by the product standard. 5.2.2 Gain adjustment accuracy: +1%.
5.2.3 Equivalent input noise: ≤1μV.
5.2.4 Preamplifier gain accuracy: ≤1%.
5.2.5 Crosstalk: ≤—40dB.
Distortion: <1 μV.
Dynamic range: ≥40 dB.
Transmission bit error rate: <10-6.
Recording bit error rate: <10-6.
6 Test methods
6.1 Test indicators Test methods
This section specifies the test methods for the test indicators of the mine seismometer. The test instruments and equipment used must be calibrated periodically and should comply with the provisions of GB6592.
6.1.1 Seismic channel consistency:
This test is performed for seismometers with two or more channels. Inspection purpose: Amplitude and phase consistency of each channel. Test method: Input a sinusoidal signal of the frequency specified by the product standard from the input end of each channel, and take the peak-to-peak value at 2/3 between the minimum and maximum values ​​of the input signal.
Calculation method:
a. Amplitude consistency:
Where: A:The effective value of the i-th channel;
A—the average effective value of all channels;
AA, the amplitude consistency of the i-th channel.
b. Phase consistency
Continuously take the values ​​of three points at the corresponding time of the channel, but it should meet the following requirements: A. ≤A ≥A1
（1）
Average value phase:
The phase difference is:
Where: Sampling rate, us,
,——fixed time difference between channels;
T-number of channels.
6.1.2 Preamplifier gain shifting accuracy:
MT 470-1996
(A2 A) × △
(A, -A)+(A, +A)
t = ti +(i- 1)d
A, = tn t,
Inspection purpose: Preamplifier gain shifting accuracy. A
Test method: Record sine wave equal amplitude signals A and B of the frequency specified by the product standard on adjacent preamplifier steps Calculation method: The gain difference between A and B is: A
Where: A-
Where: △A.-
Record the average effective value of all channels of A;
Record the average effective value of all channels of B. AA = N(
Gain shift accuracy of the i-th channel.
6.1.3 Drift and noise:
(A< B)
(i = 1.2, ...T)
The input end of the amplifier is short-circuited in parallel, the output signal is measured, and then converted to the input end, which is the equivalent input noise of the amplifier. Calculation method:
a. Drift
Where: N——number of samples;
I-sum of the amplification factors of the preamplifier and the main amplifier;
-the i-th sample point of the measured record.
b. Noise
6.1.4 Main amplifier linearity:
Test purpose: The accuracy between each step of the main amplifier. N
(Y/IP)2
. (2)
(4)
(6)
·(7)
Test method: The preamplifier step remains unchanged, and each adjacent step records two records of A and B. The input signal frequency is specified by the product standard. Calculation method: The gain difference of adjacent steps is AI(IA
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