【 Weak current College 】 weak electricity works acceptance main content

I. GCs inspection items and content
Table A test project and content
Stages of acceptance means accepting the project acceptance of content
6. system test
1, engineering, electrical performance testing (1) connection diagram;
(2) length;
(3) attenuation;
(4) the proximal crosstalk (both should test);
(5) special provisions in the design of test content completion inspection

2. optical characteristics testing (1) attenuation;
(2) the length of the completed inspection

VII. general acceptance 1, completion of the technical paper inventory, handing over the completion of the examination of technical documents
2. works acceptance evaluation examination of project quality, confirm the acceptance of results

Appendix B GCs electrical test methods and test content
B.0.2 tests include the following:
1 wiring diagram of test, the main test level cable terminating work area 8 modular universal socket and exchange between the wiring device connector terminals installed connection between right or wrong, as shown in Figure B.0.2.
2 test length should be in the test connection diagram within the scope of the request.
3 in the select a frequency channel and basic link attenuation should conform to table 1 and table B.0.2-B.0.2-2, channel attenuation including 10m (jumper, equipment connector) and the cable, plug the sum of the amount of attenuation.
Table B.0.2-1 channel attenuation
Frequency (MHz), class 3 (dB) 5 categories (dB)
16.0014.99.2
20.00-10.3
25.00-11.4
31.25-12.8
62.50-18.5
100.00-24.0
Note: the total length is 100 or less.

Table B.0.2-2 basic link attenuation
Frequency (MHz), class 3 (dB) 5 categories (dB)
16.0013.28.2
20.00-9.2
25.00-10.3
31.25-11.5
62.50-16.7
100.00-21.6
Note: the total length is less than 94m.
The above test is 20 degrees Celsius, in the three categories of twisted pair cable, each additional 1 ° c increase in the amount of attenuation 1.5%, industry 5 categories of twisted pair cable, each additional 1 ° 0.4% change. Proximal crosstalk is twisted pair cable, the second line on the induction between the signal. On the proximal crosstalk test, must be on each pair of lines is measured at both ends. A frequency, the line on the proximal crosstalk between shall be in accordance with the table B.0.2-3 and table B.0.2-4.
表B．0．2-3信道近端串音（最差线间）
频率(MHz)3类(dB)5类(dB)
16．0019．340．6
20．00-39．0
25.00—37.4
31．25-37．4
62．50-35．7
100．00-30．6
-27．1
注：最差值限于60dB.
表B.0.2-4基本链路近端串音（最差线间）
频率(MHz)3类(dB)5类(dB)
16.0021.042.3
20.00-40.7
25.00-39.1
31.25-37.6
62.50-32.7
100.00-29.3
注：最差值限于60dB
B．0．3所有测试结果应有记录，并纳入文档管理。

Appendix C-fiber link test methods
C.0.1 test before all of the optical connector for cleaning and calibration test receiver to zero.
C.0.2 tests include the following: 1 on the fibre link (including fiber and connectors) of attenuation test; 2 fiber optic link's reflection measurements to determine link length and location of the point of failure.
C.0.6 cable routing link in the transfer window measured maximum optical attenuation (insertion loss) shall not exceed the requirements of the table C.0.6, the indicators have been included link connectors and connection sockets of decay.
Table C.0.6 cable routing link decay
Routing link length
(M) ensures reduced (dB)
Single-mode fiber optic multimode fiber optic cable
1310nm1550nm850nm1300nm
Horizontal 1002.22.22.52.2
Building the backbone 5002.72.73.92.6
Building the backbone 15003.63.67.43.6
C.0.7 cable routing link any interface measured optical return loss greater than the table C.0.7 value.
Table C.0.7 minimum optical return loss
Category-mode optical fiber multimode fiber optic cable
Wavelength 1310nm1550nm850nm1300nm
Optical return loss 26dB26dB20dB20dB

5.1.1 cables should be laid according to the following requirements:
» Cable type, specifications should be consistent with the design.
» Cable layout should naturally straight shall create twist, playing ring joints, etc., should not be subject to external forces of extrusion and injury.
? Both ends should the cable labeled, shall identify the number label writing should clear, correct and incorrect. The label should use indestructible material.
» Cable terminating after due allowance. Handover, twisted pair cable between devices reserved length should 0.51.0m, workspace is 10 ~ 30mm; fiber-optic cable layout to disk should be left to reserve 3 ~ 5m length, there are special requirements should be set aside by the design requirements.
Table 5.1.1-1 pair cable and power line minimum clear distance

Units
Range
Conditions for minimum spacing (mm)
380V
<2kV.A380V
2.5~5kV.A380V
>5Kv.A

Twisted pair cable and power cable of the parallel laying 130300600
One of the parties in a grounded metal channel, or steel pipe 70150300
Both grounded metal channel or steel beam 80150
Note: both sides were grounded metal channel or pipe, and parallel to the length is less than 10m, minimum spacing is 10 mm. Twisted pair cable in a table such as the use of shielded cables, the minimum clear distance may be appropriate to reduce, and meet the design requirements.

Table 5.1.1-2 electric cable laying of underground pipes and other pipeline minimum net worth
Pipeline type parallel spacing (mm) vertical cross net distance (mm)
Lightning down lead 1000300
Protective ground wire 5020
Thermal management (no coating) 500500
Heat pipe (envelope) 300300
Water supply pipe 15020
4.0.38-bit modules common socket installation requirements are as follows:
Installed in the floor buildings or on the ground, should be fixed in the terminal box, Jack Panel adopts the form of vertical and horizontal; junction box cover can be opened, and should have a waterproof, dust-proof, resistant to compression feature. Junction box cover surface should be flush with the ground.
8-bit general purpose? modular Jack, multi-user information outlets or collection point wiring modules Express, installation location should meet the design requirements.
8-bit general purpose? modular socket base box fixed according to the construction site conditions, use preset expansion screws etc.
? You need to tighten the retaining screws should not loose phenomenon produced.
There should be various socket Panel?, with color, graphics, text indicates that the terminal equipment type.
4.0.4 cable tray and trunking installation requirements are as follows:
? Bridge and trunking installation location should be consistent with the provisions about construction plans, should not exceed compilation error; 50mm
? Bridge and trunking horizontal degree deviation per metre should not exceed 2mm;
Vertical tray and trunking buildings should be perpendicular to the ground and not tilt, vertical deviation should not exceed 3mm;
Trunking truncated and buildings for two flutes stitching Department should be smooth and Burr-free;
? Hanger and bracket installation should remain strong vertical, tidy, no skew.
Metal cable tray and trunking? section and internode should contact good, installed securely.
4.0.5 set cable trays and cable trunking protection requirements are as follows:
1) tray level laying, support spacing General 1.5 ~ 3m, vertical installation in buildings on spacing should gouti is less than the distance to 2m 1.8m following sections should be metal cover for protection.
2) trunkings laying, you set the bracket or cradles. -Trunking connector;--3m per pitch;--leave ends export 0.5m trunking;--at the corner.

Second, the CATV system
First, in the different categories of each standard test points (300-2000) on the required test project is the system output level, CNR, carrier intermodulation ratio.
1. system output level design values should meet the following requirements:
1) non-neighbouring frequency transmission system preferable 70 ± 5 V d B μ.
2) uses the neighbouring frequency transmission system preferable 64 ± 4 V d B μ.
Note: in a strong electric field intensity areas of higher floors you can raise the level, to avoid co-channel interference.
2. subjective evaluation:
1. image quality using five-level damage system evaluation
2, image and sound quality injury subjective evaluation:
Carrier to noise ratio: image interference in snow
Carrier to intermodulation ratio: image in the vertical, inclined and horizontal stripes
Crosstalk modulation ratio: channeling Taiwan
Carrier Exchange sound ratio: scroll the horizontal stripes

3. detection of TV monitoring system
1. the content detection
1) system function: camera anti-removal, damaging, defense in depth feature detection; ºptz, lens, Aperture, zoom, zoom, image transitions, shield feature detection.
2) image quality testing: in the camera's standard illumination, image sharpness, gamma, system-to-noise ratio, power interruption, single frequency interference, pulse interference, etc.
Detection method: the system detects a subjective evaluation, test items see schedule 8.3. Test results according to the color TV image quality evaluation method on the fifth level in GB7401 injury system evaluation, subjective evaluation should not be less than four levels. Image quality test uses the objective test, system test table see schedule 8.3.
If resolution, grayscale in the objective test is detected as irregularity of noise and interference signals are subjective evaluation.
3) system as a whole function testing
Depending on system design to functional testing. Including: the TV monitor system monitoring range, the on-site equipment access rate and good rate; opening of stable operation time; matrix monitor host switch, remote control, programming, data logging, logging, and other functions; systems to track performance, etc.
On digital video recording-monitoring system should detect host downtime recording, image display and record speed, image quality, the front-end device control functionality, as well as communication interface, remote networking features, etc.;
On Digital hard disk video monitoring system in addition to testing the speed of its records, you should test record retrieval, search, and other functions;
4) system linkage function testing
On the TV monitor system and security protection system other subsystem linkage function for detection, including accessPort management system, intrusion alarm systems, patrol system, parking management system, linkage control function.
5) television monitoring system workstation should be kept for at least 1 month (or in accordance with the contract provisions) of image recording.