vom multimeter

that the user does not know that there is a problem with the network card. Therefore, it is important to test the network card when looking for network faults.1. Main Nic test contentNic tests mainly 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

. when the light is injected into the optical fiber, similar faults such as fiber breakage, connector failure, excessive bending, and poor fusion quality occur, the optical fiber fault can be visually located by transmitting the light to the optical fiber. The visible fault positioner is emitted in Continuous Wave CW) or pulse mode. The typical frequency is 1Hz or 2Hz, but it can also work in the kHz range. Generally, the output power is 0 dBm (1 Mw) or less, the working distance is 2 to 5 km, a

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

Embedded-WINKHUB edge channel attack (NAND Glitch)0x00 Preface With the rapid development of IOT, research on the security of various embedded devices and routers is becoming increasingly popular. however, unlike previous software-only security research, this type of research often needs to combine the corresponding hardware knowledge. many friends are confused about how to start, and even stuck on the tool to be selected. therefore, Wang will share some practical cases and corresponding tools

lowest potential of C during normal amplification, that is, VC In short, VB is generally in the middle, VC and ve are on both sides, which is consistent with the location in the common BJT symbol. You can use this to help your image thinking and memory. In addition, although the BJT pole is not a pure resistance, the voltage direction and the current direction are the same, there will be no high potential of the current from the low potential. 1> identify the two Set the three feet of the tra

device has interrupted data to be transmitted, this transmission method is applicable to a small amount of scattered and unpredictable data transmission scenarios, such as keyboards, game poles, and mouse.4. batch transmission mode: BulkBatch transmission is mainly used to transmit and receive a large amount of data without bandwidth and interval requirements. It ensures transmission. Both printers and scanners use this transmission type. Serial supplement: http://topic.csdn.net/u/20070508/16/

degrades, to simulate a bad weather. After debugging, take it down to make the probe work in the best state.Debugging steps:① First, check whether the transmitter and receiver are on the same horizontal line. Otherwise, adjust the settings (the sights of the transmitter and receiver can be used ).② Use a wire-hanging hammer to test whether the transmitter and receiver are both vertical; otherwise, adjust the receiver.③ Open the housing of the transmitter and receiver, and check whether the red

Today, we will perform the 3786demo board test by record the methods learned during the test as follows: Changing the resistance is depressing today. I can't change it if I start to use iron. I can't change it if I use a wind gun instead. It's a joke, in fact, a small device, such as resistor and capacitor, can be used only by a referer. Test whether the component is the one you need. For example, if you are sure to change the resistance size and are not sure whether the resistance meets the r

to the Comport and set the baud rate to 57600bps OF THE jz4750 Development Board. However, no output is made to com. At this time, I found that there was a COM1 port on my computer hardware, and then I thought that the motherboard seemed to have a com-lead accessory. So I found the motherboard specification, and the motherboard had a comport. I thought that since the USB comport is not good, maybe the motherboard can come with it, so I found a com lead in the accessories and opened the chassis

connection is good. At this time, you can use a multimeter for measurement. Place the Multimeter in the resistance position of x10, and contact one watch needle of the wanzhi beads with the corresponding core wire at the other end of the network cable, the other 10 thousand uses the table pen contact information module to card the edge of the card trough of the corresponding color core line (note that it i

So how to master the quality of these media to ensure unimpeded transmission of information, it is necessary to rely on cable testing equipment verification. In addition, in the cause of network failure, more than 90% of the fault is due to cable link problems, but these problems are not only visual or multimeter can be in the shortest possible time to check out. In the process of building the network, we must pay attention to the use of the normal ca

the computer, the use of a multimeter can be connected to the power to start can see whether the line has been broken, broken off will need to be replaced. 3: The computer appeared wrong jumper computer can not start, can not boot, the solution is that we need to be based on the installation instructions to the docking, the right interface needs to be connected to the power, and then on the boot. 4: The computer can not boot on the other may

not lit, to use a multimeter to check the wiring of the 2 tube is broken, there are 7 thin wires broken, because Bxⅱ and KT laser printer fixing part and host connection is active, a few wires often disassembly easy to dismantle. If the heating lamp is often not bright, but after a long period of cooling can be used normally, this is the thermistor out of the question. Replace the new thermistor, collect the time to paint silly rose 饩 觥 s 蛴 hat pei o

a method of measuring memory chip with multimeter In the motherboard and memory data pins are 64, d0-d63, in order to protect the memory of the data bits, in the d0-d63 of these 64 bits of data are added a resistor with a small resistance to the current limiting effect. The main principle of the tester is to use the program to repeat the test memory chip each data bit pin, to see if there is no breakdown or short circuit data position pin, there is t

diagram, see whether the IO connection is correct, using a multimeter to confirm IO no virtual welding, short circuit. Next, use the oscilloscope (if not, only with a multimeter), measuring the power supply foot of the SD card seat. In general, the voltage value should be around 3.3V, if the difference is too large, may be a circuit error, or LDO power supply capacity is insufficient. If you confirm the ab

continuous wave (CW) or pulse mode. The typical frequency is 1Hz or 2Hz, but it can also work in the range of khz. The output power is typically 0dBm (1Mw) or less, operating at a distance of 2 to 5km, and supports all universal connectors. 　　 3, optical loss test equipment (also known as optical multimeter or optical power meter). 　　 In order to measure the loss of a cable link, it is necessary to emit the calibrated stabilized light at one end

motherboard on the diode and capacitance, found in the CMOS chip around a battery has significantly burned traces, with soldering iron after the use of a multimeter detection, found that this capacitor has been damaged, After replacing a capacitor with the same capacity, the fault is resolved. Two, the CMOS setting is still unable to save after replacing the battery Failure phenomenon: A desktop compatible machine that uses more than three years, r

heat protector open circuit to replace. Fault three: A Canon Bxⅱ laser printer's heating lamp sometimes bright, sometimes not bright. Overhaul method: When the heating lamp is not bright, must use the MULTIMETER Examination 2 Tube's connection line to be broken not, also has 7 thin wires to be broken not, because Bxⅱ and the KT laser printer fixing part and the host connection is active, several wires often disassemble and dismantle easily. If the

deflection, a small deflection; the rest of the time must be reversed before and after the measurement of the pointer deflection angle is very small, this time not measured that the foot is the base we are looking for (see Figure 1, Figure 2 is not difficult second, PN Junction, fixed tube type after finding the base of the transistor, we can determine the conductive type of the tube based on the direction of the PN junction between the base and the other two electrodes (Figure 1). The

handled in the following ways: Remove the CRT tail seat plate, the CRT on the high pressure cap 24KV high voltage multimeter pen line (preferably using a digital multimeter with better insulation performance) into the CRT focus plate socket, turn on the monitor AC power, with a grounded table pen line to the accelerator pole (G2) Plug instantaneous discharge 2~3 (preferably the CRT on the G2 plug with a pr