whats multimeter

/between a space), insert the original system disk repair system, the system will be automatically compared to repair. 　　Step 5: If the computer keyboard fails to continue, set the optical drive in the BIOS to insert the original system into the first boot device and press R to select "Repair Installation". 　　Step 6: If the computer keyboard fails, it is recommended to reload the operating system. (1) After the power-on computer can not detect the keyboard to check the keyboard interface is

hard disk interface set as the upper end) of the SMD resistance components in a component (its label on the 1r00) on the surface as if slightly puffed up the bubble skin, a shave with a finger is lost, but there is no obvious burning mark on the component, only a metal point of the size of the needle. Use the Multimeter electric block to measure the element resistance to 128kω. And then use the multimeter

XP system computer Hardware common problem analysis is as follows: 1: The computer's motherboard capacitor damage to our graphics card is not normal use, the solution is that we directly use the capacitor on the motherboard to replace the nominal value can solve the problem. 2: The computer power switch can not be used normally, the Start button is not open after the computer, the solution we preferred to test the computer, the use of a multimeter c

well observed. When you are sure that the system is correct, the author (preferably please professional notebook repair master to check, it is best not to take apart) then open the display, will see the high pressure of dangerous board (high voltage) This is the High-voltage plate, the high-voltage plate insulation after removal we can find the entire high-pressure plate structure, The motherboard has 4 wires and high pressure board, then, the High-voltage plate through the chip distribution vo

with a working wavelength of 1310nm or 1550nm, and the best fiber-optic recognizer is the use of macro-bending technology to identify optical cables and test the transmission direction and power of optical cables online. 2, the fault locator (fault tracker). The device is based on the laser diode visible light (red light) source, when optical injection of optical fiber, if the fiber fracture, connector failure, bending over, welding quality, such as the failure of the same, through the light

slightly harder plastic (such as an abandoned floppy disk jacket), the size is equal to or slightly larger than the size of the key body, and in the position of the bar through the opening of After it is set on the stick, insert the key cap, and use this gasket to prevent the key cap and the key body stuck, you can repair the failure button; If due to spring fatigue, the cause of the tension of the shrapnel caused by the card key failure, then the special key body open, slightly stretching the

default, sort by the system CPU utilization, or you can simply click on the item by mouse to change the sort method.Customizing a work sheetGuide customizing to create a work sheet shown in 14-71. Select File-> New, 14-52. Enter the title and the number of rows, that is, the maximum number of monitoring windows, here is four. 14-6Note: Minimum 2 second update interval3. Now simply drag the sensor from the left CE to the right CE window. The display can be selected as–signal Plotter. Displays on

How to open an offline Web site Using the Teleport Ultra software, you can create a new project file, and then open the appropriate Web site using offline mode. Step 1: Double-click the Teleport Ultra program icon on the desktop, open the Program main window day, click the File New Project Wizard command, as shown in the following illustration. (Universal meter and Multimeter use method http://www.woaidiannao.com/html/xwzx/6599.html) S

We first use a multimeter to measure the USB four lines (red +5v white data-data-green data-data-lacquer line) multimeter Red table pen to the ground black pen measurement (white line and Lu Liling line. The resistance of 50 euro, the two lines are from the South bridge out, if the resistance changes too large can be judged is the South bridge problem. Description USB module burned inside the South bridge

following several. Treatment: For the following reasons, exclude each. Requires you to be familiar with digital circuit analog circuit, will use multimeter, and sometimes need to use the debug card to check the fault. (1) CPU-related issues CPU does not have power: Use the multimeter to test the three (or one) field tube around the CPU and three (or one) rectifier diode, check the CPU is damaged. CPU s

Offline Live detection Under normal circumstances, in standby state of ps-on and Pw-ok two power signals, one is high, the other is low level, plug 9 feet only output +5VSB voltage, as long as the meter to measure the voltage to the parameter value, you can determine the result of the problem. Artificial Wake power supply detection Use a thin wire (such as a paper clip, fine copper wire, wire or tweezers) to ps-on the 14 feet of the ATX plug (the only Green Line) and the 3rd on the other end.

pure water, the experimental test found that tap water also meet the requirements, of course, the fear of video card problems friends can buy a few bottles of pure water to clean. First let's look at how to use tap water to clean the video card: In order to dispel everyone's concern, we first have to measure whether the electric conductivity of tap water, here need to use a multimeter, mainly using resistance to test the resistance of the water, th

into general instruments, such as oscilloscopes, multimeter and other instruments, professional strong special instruments, such as old Xie Digital TV, this professional field will have a lot of special instruments, such as SFU, VM700, TG39 and so on. by function: Lao Xie The instrument is also divided into two categories, output class (signal source) and input class (measuring instrument). In the back of the content, Lao Xie will list some

In order to search the LCD display in use of the fault, you can use the pointer-type multimeter rx10kω resistor file for tracing. This is a high resistance file, you can check the impact of the display of a variety of pass and break. And because it has 9~15v DC voltage, it can drive the LCD display, Judging whether the measuring device is normal from the display state. But since the multimeter outputs a DC

maintenance methods have advantages and limitations, often used in combination. 1. Cleaning law The brush can be brushed lightly to the dust on the motherboard, in addition, some cards on the motherboard, chip using the form of pins, often because of the oxidation of the pins and poor contact. Use eraser to surface oxidation layer, reseat. 2. The Observation Act Repeatedly look at the repair of the board, to see whether the plugs, sockets are skewed, resistors, capacitance pins are collidin

wire logging tool with the wire slots and wires of the information module, and cut off the extra wires outside the module. Repeat this operation and connect the streamline in the cable to the metal slice behind the module. Step 2: add the plastic dust-proof sheets of the information module to the twisted pair wire along the gap and fix them on the information module. Then, stamp the module with an iron and press it to complete the whole process of making the module. Then, put the created inform

judgment. Otherwise, it may waste a lot of time in the wrong direction. The statistical data shows that the switch port and network card work in full duplex and half duplex) mismatch accounts for a considerable part of the fault.To sum up, simply look at the green or yellow LED lights on the NIC or switch to make judgments on the cable, Nic or switch port. Otherwise, incorrect judgment due to a simple phenomenon will lead the fault diagnosis to go astray and waste a lot of time. In addition, th

include: whether the connection pulse of the NIC is available and normal (power level and polarity), and whether the NIC level is normal, whether the speed of the network adapter matches the speed of the hub or switch (10 M or 100 M), and whether the network adapter works in a way that matches the network device (full or half duplex ), whether the network card is very wrong frame (long horizontal frame and short frame) And what protocols are bound to the network card.

range. Generally, the output power is 0 dBm (1 Mw) or less, the working distance is 2 to 5 km, and all universal connectors are supported. 3. Optical Loss Test Equipment, also known as A multimeter or power meter ). To measure the loss of a optical cable link, a calibrated stable light must be transmitted at one end and the output power should be read at the receiving end. The two devices constitute an optical loss tester. When the light source and p

During the establishment and use of the LAN, users often encounter network failures due to hardware equipment faults. This article uses the specific fault examples and Q A methods, describes the causes and troubleshooting methods for faults of hardware devices (transport media, NICS, hubs, and switches) in the LAN. I. Common Faults and troubleshooting of transmission media 1. Network Communication fails due to changes in line resistance [Question]: A computer terminal that can communica