whats multimeter

. 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 filter is mounted on the receiver optical component.④ Set the multimeter to the DC 10 or 20 V position and insert the measuring rod into the test hole of the recei

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

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 to bring the comport to the rear panel of the chassis. Connect to the com line, open putty, Boot, LINUX started, com still did not respond. At this time, a technical support on QQ reminded me that th

one with the threading clamp, but it is less efficient) to ensure good contact, as shown in. Then cut off the extra lines outside the module. 　 　　　　　　　　　　　　　　 　 [Tips] Generally, the information module is marked with a color line sequence of TIA 568-a and TIA 568-b at the same time. It should be subject to the requirements of the wiring design, use the same line sequence as other connections and devices.Step 2: add the plastic dust-proof sheets of the information module to the twisted pair alon

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 whole computer is divided into hardware and software two parts, when the computer fails, everyone will analyze the hardware or software, the software part of the system will be roughly solved by reloading, but the hardware contains a lot of content, computer chassis, main body, hard disk, built-in memory, CPU fan and so on are included in the hardware facilities, there are problems when you do not know how to troubleshoot what part of the problem, the following small series for everyone to s

power supply light, the machine can not work properly. Repair method: Through the inspection found that the problem is not a fixer, is not a power supply, small relay problems, but the power box next to a small box tube heating a 102J small resistor and circuit board contact is not good, because it is both sides of the circuit board, to both sides of the welding, electric chrome welding after troubleshooting. This fault in the St laser printer is very common, but sometimes the heating lamp is

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

Do SD/MMC Card Drive project also has a big six months, always feel that the sum up something. Here, the main is to record some of the more common problems and solutions, so as not to encounter again. The first is the SD/MMC card initialization error problem. Before finding the error, confirm: 1. Use the card reader to confirm whether this SD card is damaged; 2. Read the same card with another set of environments (the same program); 3. It is normal to read another SD card in the same environment

. Most fiber-optic recognizers are used for single mode fiber optic cables 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,

motherboard battery voltage is not enough to deal with: replace the battery can be. If some of the motherboard battery replacement, can not solve the problem, you should first check the motherboard CMOS jumper is a problem, sometimes because the motherboard on the wrong set of CMOS jumper to clear options, or set into an external battery, also makes the CMOS data can not be saved. But this failure did not find the jumper set is not correct, in general, the new replacement of the battery, at le

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 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. Fault four: The output image color is s

reverse resistance, observe the deflection angle of the needle, and then take 1, 32 electrodes and 2, 32 electrodes, respectively, the reverse measurement of their positive and negative resistance, to observe the angle of the needle deflection.In these three reversal measurements, there are bound to be close to two measurement results: the reversal of the measurement of the hands of a large deflection, a small deflection; the rest of the time must be reversed before and after the measurement of

is still recognizable, most of which is caused by the first reason; if the characters are large area blurred, the screen is a white halo, the characters are unrecognizable and the screen brightness changes when the focus potentiometer on the FBT is changed, the third reason is If the CRT is just open, the screen characters become more and more clear over time, which is usually caused by the second reason. 　How to troubleshoot problems according to the symptoms For the first case, turn on the

, analysis of network traffic change law. Helps optimize network performance and troubleshooting. The test can be done using a little pass, 683, or network analyzer, which can monitor the network for a long time, and use the reporting software to draw a cycle chart of network traffic. Vi. single-Machine connectivity test Test the network adapter's working protocol and physical parameters. Test single network speed under 40% loading conditions, subjective evaluation, if the link flow from 30% t

other. Expand your Reading (English): What is a data scientist with a unicorn type? : Do not know why now what "unicorn" type of this concept will be so popular, enterprises also love to call Unicorn, the industry also called Unicorn. But why a unicorn, I first thought of the wizard series game. (Cover face ~) Top Data Analytics tools for business: Ten tools for commercial analysis, highly recommended!!! Data science:bridging the Business IT Gap: The second part of the m

Java 8 has been out for a long time, because I have been doing Ruby has no time to study, take advantage of the empty tidy upHttp://www.oracle.com/technetwork/java/javase/8-whats-new-2157071.htmlHere we mainly look at the new features related to programming languages:Lambda expression:The problem with anonymous classes now is that when an anonymous class is implemented very simply, such as an interface that contains only an abstract method, its anonym