Product Description Xy-4-3A Drillng Rig,Drilling Machine,Drillng Rig,Engineering Drilling Rig JIANGSU XI TEC ENVIRONMENTAL&DRILLING EQUIPMENT COMPANY CO.LTD , https://www.xitecdrilling.com
1. This monitor can not use switching power supply, please use a good 12V DC power supply. You can use the monitor power supply or adapter specially designed for power supply. 
2. If the audio cable is connected to another audio device, disconnect it and connect it directly to the ordinary active speaker for the Walkman/PC. If noise disappears indicating that there is no problem with the monitor itself, check the connected audio device or other aspects.
3. Check whether the noise is caused by the sound self-excitation: The monitor speakers must not be too close to the monitor head, try not to test in the same room. Due to the high sensitivity of the monitor head, the sound of the speaker's feedback to the monitor's microphone will inevitably cause the sound to spur. The same room needs monitoring and headphones can be used.
4. It is best to route the cables separately. Do not use the same cable tray with strong AC power, and try to keep away from strong electromagnetic interference devices such as transformers and luminaire rectifiers. The use of 3X0.5RVVP shielded cable can also effectively avoid external interference, which requires the shield to be grounded at one end.
5. It is forbidden to connect the monitor head to the microphone (MIC) input of sound cards, mixers, amplifiers, etc., otherwise the equipment may be damaged. This is because the inside of the monitor head includes a microphone, but it also includes circuits for amplification, noise reduction, and echo processing. The output of the monitor head is a "LineOut" audio signal of 1Vpp or more.
6. Some video monitors come with speakers, but they may not work well. Use premium headphones or powered speakers for monitoring.
7. The quality of the integrated sound card on some computer motherboards is poor, and it may cause severe noise during recording. Please use a quality independent sound card such as Chuangtong.
8. Check that the volume of the monitor's sound gain potentiometer or amplifier is adjusted properly.
9. Some brands of audio distributors are not of high quality, which can lead to boring sound, cracking, etc. Please use high quality dispensers or our company's monitor head adapters.
10. Some models of hard disk video recorders only focus on video processing while ignoring audio processing may result in poor audio quality for simultaneous recording. Please disconnect the DVR first and then directly use high quality headphones or powered speakers to listen to the audio line. If the sound quality is good, it can be determined that there is no problem with the quality of the monitor head.
11. If it is confirmed that the noise originates from the environment, the APM212 noise reduction adapter can be used to effectively filter the ambient noise.
I. Some Features of XY-4-3A Drillng RigNew Condition Core Sample drill
1. Power can be electrical motor or diesel engine, as per your project needs;
2. Engine and Mud Pump,Reduction gears and Drill rig are all installed on one base, more compact structure and improve the overall rigidity;
3. Mounted in 2-wheel trailer,easy to move around when working;
4. Easy to disassemble,installed and operation, the Heaviest part is less than 100KG, convenient for maintenance and transport;
5. Using alloy bit for soft ground,using diamond bits for hard ground.
II. Customers
This hydraulic drilling rig has been successfully sold to Kenya, Peru, Chile, South Africa, Haiti, Congo, Philippines, Malysia, Gabon, Kenya, Columbia, Russia, Uganda, Panama, etc. Some of them are for personal use, some to do engineering, some trading companies. Namibia customers are used to do charity for poor children wells, we give him a big discount without any profit. You are welcomed to visit our company and factory at any time!
Noise reduction method for pickups
The security monitoring pickup monitor can check the following aspects to reduce noise: