vom multimeter

preparing to read the disc at high speed, when the host is just started, the dual hard disk copies data, the output may be stopped due to insufficient Instantaneous Power Supply and power protection. However, when the power supply stops, the load is reduced, and the power supply starts again. Because the recovery time after the protection is very short, the performance is that the host restarts automatically. Another case is that the performance of the host's switching power supply is poor. Alt

and evening is so big, and I am more confident about tomorrow's competition! Saturday night11Point half:Just as I was about to clean up and go back to the dormitory, I found that there were still some problems with the car and the revolver was not turning around. I was a little nervous. Based on my previous experience in car shunting, I intuitively told me that the situation was serious. It is impossible to go back to rest at night. After investigation, it is basically determined that the mot

experience. One by one, we found that the machine has only one circuit sensor, when the sensor is removed and measured with A multimeter ohm, it is found that the resistance value of the sensor is extremely unstable when it is not operated. It is determined that the sensor is the cause of abnormal printer operation. Because it is difficult to buy such sensors of the same model on the market, it is best to fix them. Take care of the sensor and find

driver's framework. Here, you must have an understanding of FB. It will be easier to see the code later. To know how the driver controls the hardware, you should focus on the flow of data streams and configure the registers. The flow of data streams is concentrated on several important data structures. You must understand the data structures so that you can configure your registers in the framework ~~~ To debug the hardware, you need to know how to use the two tools, whether the voltage measure

High-impedance mode and three-state gate high-impedance mode this is a common term in a digital circuit. It refers to an output state of a circuit, neither a high level nor a low level, if you input the next level circuit in the high-impedance mode, it has no effect on the lower-level circuit. If you do not use a multimeter, it may be either a high-level or a low-level circuit, depends on what is next to it. The essence of high impedance mode: when a

this case, you can only change the car belt or guide rail. 3. Word car motor fault The fault of byte motor itself is mainly caused by the burning of a group of stepping motor or multi-phase winding coils (short circuit and open circuit). This fault can be directly measured by A multimeter with the DC resistance of the motor coil winding and the normal resistance (in general, the four sets of coils of the motor will not all burn out, and there will al

in sequence. The phenomenon is the same as that of the first server. This is the time to be clever: once an image without a BT driver is run, then, the driver cannot be opened normally when the driver is installed with the BT driver. The BT chip has not been reset !!! This is my guess. I immediately got a power failure and got the power on again. The system image that contains the BT driver could not be opened normally. Start with the previous verification results. When I re-burn the system im

. Haha! I really envy the creation of aerial models! This is not a matter of money. It does not cost much. 1. A large flow table and woodworking station. 2. A professional production platform (including drilling machines and small lathes ). 3. There are two toolboxes to work on. 4. If possible, create a small paint room. 5. If possible, build a small pool.6. Electrician production platform and related tools. 7. Design and writing desk. 8. Comprehensive lighting. 9. Complete Set of testing equipm

manual of the chip and the actual operating frequency, for example, the length difference between data lines in the same group cannot exceed how many mil, And the length difference between each path cannot exceed how many mil.After these requirements are determined, the PCB design personnel can be explicitly required to implement them. If all the important wiring requirements in the design are clearly defined, they can be converted into the overall wiring constraints, using the auto-wiring tool

One day, I repeatedly started the machine several times, and then pressed the power key, but it didn't respond. After my check, it turns out that the power supply is not working and there is no voltage on all the feet.At first, I thought the fuse was burned out due to frequent start, but I took the power off and saw that the insurance was good. Measured with a multimeter, the circuit is indeed powered on. Then, the DC voltage after the rectification b

It's really a little annoying when books are used. Remember to keep this microphone there after I bought it and it was useless for a while. Once I suddenly thought about it, I found my microphone. But who once thought it was actually broken? What should I do? I can't do it, but I can only repair it. I can do it myself, hey. I thought it might be that the line was broken. At that time, there was no Multimeter in the house. It was too troublesome to bu

and welding. The test point should be designed on the coordinate grid to Where the test needle bed is matched, and can be tested at the weld surface. If the flying needle test, it is necessary to ensure that the test point is located on the coordinate grid, but also in the layout to maintain enough space to make the probe (flying needle) hit the test point, the Flying needle test can be carried out on both sides of the board, the main detection ofCommonly used test methods are manual testing an

Damping refers to the gradual reduction of the vibration amplitude caused by external effects and/or inherent reasons of the system in any vibration system, and Quantitative characterization of this feature. In electricity, it is almost the meaning of response time. In mechanical physics, the energy of the system is reduced-damping vibration is not caused by "resistance". In terms of mechanical vibration, one is caused by friction resistance, reduce the mechanical energy of the system and conver

Work notes: hardware-related knowledge The maximum size of the standard video signal is 700mV, and the basic voltage is between 0.7-1 V. The camera output is basically a BNC connection tip: use A multimeter to test the two wires connected to the two ends. If you know the standard voltage, you 'd better test the standard voltage. Aviation plug: it is an electromechanical component that connects the electrical line. Therefore, the electrical parameters

, the Earth knows that the description of this figure is prepared for the above figure! Here I will explain some interface solutions in this figure! In the figure above, a/a B/B is connected to the second and fourth line of the stepper motor. Of course, some stepper motors are wireless and generally black! A/A represents the two ends of a item. Let's just tell you how to determine a/! Use A multimeter to test the short-circuited block to contact two o

specify, data register is connected to data lines, control register is connected to control lines and Status Register is connected to status lines. (here the word connection does not mean that there is some physical connection between data/control/status lines. the registers are already ally connected to the corresponding lines .) so, whatever you write to these registers will appear in the corresponding lines as voltages. of course, you can measure it with a

: "different, senior engineers are at a high level, TVs with any difficult problems can be repaired, and the repair rate is significantly lower than that of engineers, but the repair cost is relatively higher, therefore, this is the customer's choice ". Hospital Director: "My TV should not be a serious problem. It's just a general engineer ". Repair Shop reception staff: "Well, please pay 20 yuan for the repair fee first ". Hospital Director: "Why do I have to pay for the repair "? Repair Shop r

Recently, I am working on the low power consumption of the PIC microcontroller. So I set different I/O port States to test the power consumption. The current is measured using a series multimeter. the I/O port of the microcontroller is suspended, the entire system is not driven by peripherals, and the test uses the pic16f690 microcontroller. The idea is as follows: after the system is powered on, all Io is initialized, and then sleep () is called t

= 1 ,. gpios = vibrator,}; static struct platform_device my_timed_gpio = {. name = "timed-gpio ",. id =-1 ,. dev = {. platform_data = timed_gpio_data ,},}; In make menuconfig, select related options in Android under staging under device. Then you can run the kernel. After the kernel runs, you can test it. Because the timed gpio driver creates a child for each device in the/sys/class/timed_output/directory The enable file in the sub-directory of the device controls the Time of the device. B

corresponding voltage signals will be transmitted online, which can be measured by a multimeter. The signals sent to the parallel port can also be read through these registers, for example: we write "1" to the data register, and data0 will be raised to + 5 V voltage, so that we can open or close the data line or control line through programming. Where are these registers? In ibm pc, these registers are Io ing and are unique addresses. On a typical P