whats multimeter

inserted on any P3, shake the lead close to the plug position, as long as the two ears are ringing, the listening head must be OK, the damaged part must be the plug. If only one ear rings. Further detection is required. 3. Determine whether the listening header is damaged. The general good ear plug listening head is not bonded with a kubernetes, but with a soft adhesive. It is doomed that it will not be a one-time task. Use a knife or a small screwdriver to gently open the heartbeat lid and we

the adapter,The adapter with an output current of 1.5a can meet the needs of two mobile hard disks simultaneouslyIf you have more USB devicesThe current of all devices is added (the standard device has a nominal current value on the nameplate) and multiplied by 1.2.To ensure a certain margin of power supply, and then select the hub adapter based on the total data. Step 2: view the voltage If an active USB hub is used, the safety of the device is maintained on the adapter. If the output volt

light is not on. After the power is turned on, only one power lamp is on, and the machine cannot work normally.Repair Method: check shows that it is not a problem with the recorder, nor a problem with the power supply or a small relay, but a 102J small resistance heated by a tube in a small box next to the power supply box is not in good contact with the circuit board, because it is a dual-sided circuit board, it must be welded on both sides, and troubleshooting should be completed after the el

What to do if the laptop motherboard is out of power: First step. First, pin 14 and 15 short, and if the fan on the ATX power supply rotates, skip this step and look at the next one. If the fan on the ATX power supply does not rotate, use a multimeter to cross the +5svb end of the Pin9 to measure the Pin15 voltage, and if there is a +5v voltage, then there is a doorway, please see the next one. If there is no voltage, generally please discard this

prompted the hard drive read errors. 2, restart the computer, run HDD scan software into the main interface, and then click the "Start" button-year-old hard drive for scanning. 3, scan the completion of the scan results will be a legend in the form of the right side of the interface, the figure shows that the hard drive does not exist any bad. 4, restart the computer failure is still, at this time suspected power supply D line plug voltage is insufficient, and then use the

drive does not exist any bad. 4, restart the computer failure is still, at this time suspected power supply D line plug voltage is insufficient, and then use the Multimeter Test D line power supply voltage. 5. First measure the voltage between the yellow and black lines corresponding to the pins, the multimeter will be adjusted to 50V, and then the black pen inserted into the line of the wire correspondi

to 1A or so, and then plug in the power, gently touch with the hand to find the heating elements, such as find, replacement, if you can not find the obvious components, increase current, continue to find. 3 maintenance of common short-circuit components: Ceramic capacitance: Ceramic capacitor is multilayer chip structure, the principle is that two charged conductor close to each other, insulation, will accommodate the charge. And the two ends of the capacitor are not able to pass. ceramic Cap

Debugging is to enable the ups to run properly at startup. The specific content of various types of USP to be debugged is different, but the tests that must be performed generally include the following content. I. Preparations before debugging 1. tools used for debugging Tools used for debugging include multimeter, internal resistance tester for battery, electric tester, and phase table. (1) multimeter:

development board is a standard serial port or a non-standard serial port. It depends on how the schematic diagram is connected. ^-^ Question 2: How to identify cross-string and direct-line connections? Test with A multimeter. If the General Principles of 2, 2, 3, and 3 are directly connected to the serial line; if the two and 3 connections, the general principles of 3 and 2 are crosstab lines. Some people are confused that the outside of the mother

a digital multimeter, during normal use, the single-chip microcomputer inside the table is in normal working mode. when not in use, you forget to turn off the power of the multimeter. Most tables are waiting for several minutes, if no manual operation is performed, it will automatically turn off the LCD display to reduce the power consumption of the system. Generally, the implementation of this function is

all out.3 According to the original order of the white plastic bracket, print needle armature pressure reed, back cover and fixed card, loaded with the print head shell, with a group of +10v DC voltage applied to each group of print needle on the drive coil (method with the LQ series print head), In turn, test the flexibility of the needle out of each print needle and the consistency of the flight distance.4 Put the print head back to the original printer, do not install a ribbon, self-test pri

The first step, in the working time to open the router's management information base that is MIB, MIB information on the network on the average flow of less than 50%, only a small part of the data collision, which indicates that the current network structure most of the equipment is intact, the fault may be caused by a workstation. In order to accurately identify the fault point, to find a network of multimeter access network for testing, network cong

1 motherboard capacitor damage causes graphics card to work abnormally Case My computer suspected that the motherboard is broken, open the chassis, found that the AGP side of the electrolytic capacitor has been bulge, how to solve? [Case analysis Processing] The capacitor has the characteristic of AC-DC breaking and the electrolytic capacitor acts as the filter in the circuit. The capacitor drum is due to high temperature, high pressure and capacitance of its own quality, according to the no

Open the display machine does not display, with the Multimeter electric barrier test power line input, resistance to infinity, indicating that the power cord has been open. Power-on check, found that the fuse on the circuit board has been blown, replaced with a new fuse, the boot that burns insurance. There is a high pressure inside the monitor, although it does not cause life risk, but the taste of electric shock is not easy. Therefore,

-serial line and the direct-connect serial line. Measured with a multimeter, if 2 and 2, 3 and 3 are straight serial lines, if 2 and 3 pass, 3 and 2 are the cross-serial line of the general. Someone confused mother mouth outside is a piece of insulating rubber, multimeter probe can not go in how to test it ... Then cut a small section of welding solder (I have also considered the use of wire, but the wire

automatically convert between numbers and strings based on operator characters between scalar values when needed. 9 of the scalar quantities in Perl are shaped like $fred. When a string is enclosed in double quotes, if the variable has no backslash before it, the value of the variable is replaced (if a variable is not assigned, a null value is used). Perl provides the delimiter {} to enclose variable names, such as: $what = "Brontosaurus steak"; $n = 3; Print "Fred ate $n $

Http://www.discuz.net/viewthread.php?tid=43137sid=G4jizDNovember, 2003MySQLs Query cacheby Ian Gilfillana Typical Scenarioboss:our new website is crawling! How can it be, we had four State-of-the-art web Servers-whats the problem? You:well, the Web servers is fine-its the database server thats struggling. Boss:what? You told me this MySQL thing is fast, that's we didnt need Oracle, and now you say it cant cope! How can the this be? You:well, the Web s

("imgurl "); $ Nextitem3 = $ objDom-> createElement ("fileurl "); $ Item-> appendChild ($ nextitem1 ); $ Item-> appendChild ($ nextitem2 ); $ Item-> appendChild ($ nextitem3 ); $ Text1 = $ objDom-> createTextNode ($ v [0]); $ Text = $ objDom-> createTextNode ($ v [1]); $ Text2 = $ objDom-> createTextNode ($ v [2]); $ Nextitem2-> appendChild ($ text1 ); $ Nextitem3-> appendChild ($ text2 ); $ Nextitem1-> appendChild ($ text ); } Echo $ objDom-> saveXML (); } Simplexml_load_string converts an xm

, coupled with a large character set, UTF8MB4 performance may be lower than the UTF8 series collations, you can refer to a test results on Stackoverfolow: http://stackoverflow.com/questions /766809/whats-the-difference-between-utf8-general-ci-and-utf8-unicode-ci, the difference is not particularly large.Operations: If a large environment, if the other database is UTF8 mode, one of the libraries set to UTF8MB4 mode, in the subsequent handover operation

source in a single operation. · Though the dataset is universal, other objects in ADO. Net come in different versions for different data sources. 16. Can you give an example of what might be best suited to place in the application_start and session_start subroutines? This is where you can set the specific variables for the application and session objects. 17. if I'm developing an application that must accommodate multiple security levels though secure login and my asp. net web applicatio