Exclamation marks always appear on the graphics card of a card m
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may be caused by the driver is not completely installed, or the driver version installed does not match the system
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re install other driver versions, or ask the customer service of the graphics card brand if they need to install the driver for mining and switching< br />
The yellow exclamation mark on AMD graphics card is that the graphics card driver is not installed properly. You can use tools such as 360 driver master or driver wizard to install the graphics card driver
The operation steps are as follows:1. Open the Internet search engine of the computer browser, input the keyword of "360 driver master", click "network once", and then click the first website with official website logo
The yellow exclamation mark on the graphics card means that the driver of the graphics card is not installed correctly, and the driver of the graphics card needs to be re installed
the installation method of graphics card driver is as follows:
1. Find the "start" item in the lower left corner of the computer desktop and click to enter
This is because the driver of the graphics card is not installed properly or the driver of the graphics card needs to be updated
here, take win 10 operating system as an example, the methods to update or install the graphics card driver are as follows:
first, find "this computer" on the computer desktop
This is e to the incompatibility between the graphics card driver and the system, or the old version. Just update the graphics card driver. The solution is as follows
First, find the "this computer" icon on the desktop and right-click it< br />
many of Tajikistan's hydropower systems were built in the Soviet Union, and the equipment is aging. It is astronomical to replace or maintain them, so it is difficult to operate them, let alone build new ones
2. Disputes over water resources with downstream countries continue
Tajikistan and Kyrgyzstan are located in the upper reaches of the SYR River and the Amu Darya River respectively, monopolizing the water resources in Central Asia. During the period of the Soviet Union, the disputes over water resources among the five countries continued, and the post friction increased day by day. Therefore, every move of Tajikistan will touch the sensitive nerves of other countries, especially the construction of hydropower stations, which will stimulate other countries in Central Asia, especially Uzbekistan. Uzbekistan is known as the "platinum country" because of its abundant cotton proction. Planting cotton requires a lot of water. Uzbekistan is located in the downstream area. In order to ensure the normal growth of its cotton, Uzbekistan strongly opposes the construction of the rogun hydropower station in Tajikistan, so the two countries often have friction< The investment environment is poor and the attraction of foreign investment is weak
since its independence in 1991, Tajikistan has been involved in eight years of civil war, and it was not until the peace agreement was reached in 2000 that the country embarked on the normal development track. Political turmoil has worsened the investment environment in Tajikistan, making it difficult to effectively attract foreign investment, especially the country's transportation, communication and other infrastructure to meet the needs of economic development. Tajikistan's transportation is mainly by road, but the railway, river transport and air transport are underdeveloped. The total length of the existing roads is 30000 km, but almost all of them were built in the Soviet era. Many roads are in disrepair for a long time, and the compliance rate is less than 1%. So the situation is turbulent and the investment environment is not good
4. Due to the seasonal influence of rivers, the power generation is unstable
e to the influence of seasonal precipitation difference, the power generation of hydropower stations in Tajikistan is extremely unstable. In March and April of each year, e to less precipitation and insufficient river runoff, the power generation of hydropower stations in China is seriously insufficient, and the government often introces power restriction measures.
1. Re: radiated emission (100k ~ 2.7g) radiated emission: radiated disturbance test
2. Ce: concted interference Ce (150kHz ~ 108MHz): concted disturbance test
3. Rs: Radiated Immunity: Radiated Immunity Test of radio frequency electromagnetic field
4. CS: concted immunity: Radiated Immunity Test of radio frequency field inced concted disturbance
5 EFT: transient pulse interference: Electrical fast transient pulse group immunity test
6. Dip: voltage sag: voltage sag, short interruption and voltage change immunity test
7. ESD: electrostatic: electrostatic immunity test
8. Surge: immunity surge (impulse) immunity test
power line inction applies switching impulse voltage to low voltage winding of power transformer, It is a test to make the insulation of high voltage winding of transformer withstand overvoltage test by electromagnetic inction
the voltage waveform applied in the test is a kind of waveform generated by simulating the switch operation or fault in the power system, which is called switching impulse voltage wave
according to the Chinese power instry standard, the switching impulse inced voltage withstand test can be applied to the substation site to test the insulation of power transformer
Power line contact test simulates the direct contact between power line and communication line; The power line inction / contact test is carried out for the twisted pair port and external AC or DC dedicated power supply port of telecommunication terminal equipmentthe power line inctive contact generator is a common basis for simulating the interference of power line or electrified railway system to adjacent communication lines and the direct contact between power line and communication line
extended data :
EMC includes two major items: EMI (interference) and EMS (sensitivity, anti-interference)
EMI test items include: re (radiation, emission)
1, Ce (concted interference)
2, harmonic (harmonic)
3, Flickr (flicker)
EMS test items include: ESD (static)
1 EFT
2, dip
3, CS
4, RS
5, surge
6, PMS
classification:
I. EMI (electric magnetic interference) - electromagnetic disturbance test
main contents of EMI test:
1 The purpose of this test is to detect whether electrical procts can work stably in electromagnetic environment, Not affected
Main contents of EMS test:1, ESD - Electrostatic immunity test
2, RS - RF electromagnetic radiation immunity test
3, CS - Concted disturbance immunity test inced by RF field
4, dip - voltage sag, short-term interruption and voltage change immunity test
5, surge (impact) immunity test
6 EFT - Electrical fast transient burst immunity test
7, pfmf - power frequency magnetic field immunity test
8, stray definition: refers to the radiation on discrete frequencies (i.e. far end radiation) except carrier frequency and sideband and adjacent channel caused by normal molation and switching transients when molated by standard test signal. Stray radiation can be divided into conction type and radiation type according to its source
Concted spurious: refers to the level power of any discrete signal measured on the 50 ohm load at the antenna connector10. Stray radiation: stray disturbance caused by the enclosure, structure and interconnection cable of the test equipment. The test conditions are preferably carried out in the anechoic chamber or outdoors