Decentralization of DAC
Samsung chip reset: * 2767 * 3855 ᦇ can also be used to unlock the phone lock or card lock
Samsung display temperature Battery capacity: * # 0228 #
Samsung display contrast: * # 0523 #
Samsung software version: * # 9999 #
Samsung a100-a188 view version: * # 0837 #
Motorola t2688 unlock all locks: 19980722
t2688 / 2988 / 988d no Chinese: * # 0000 # OK (insert card)
Motorola all locks: press menu + 5 + 1 / 2
Siemens restore factory settings: * # 9999 #
West Siemens software version: * # 06 # left key
Ericsson old machine return English: * # 0000 #
Ericsson new machine return English: press CLR - left key - 0000 - right key
Ericsson display factory date: right, *, left, left, *, left, *, left *< br / < br /
Nokia's factory date: \\\\\\\\\\\\\\35;
NEC restores original factory settings: * # 738 #
waveguide S1000 hidden function: * # * #, 1705 #
waveguide S1000 unlock: * # * #, 1705 #, 46 (also used for 999d, 720)
if it crashes, use it again -- - 24681357 (or use it directly)
waveguide 8xx / 9xx series: * # + serial number 7-14 #
remove the last 9 bits of SIM card waveguide serial number
Alcatel ot221 / 220 unlock: 25228352 / Alcatel + d
Alcatel ot301 / 302 unlock: 83227423
Alcatel ot500 / 700 unlock: 25228352
Konka: * # 0001 # * # 1001 ##
Konka Xiaoxue 5219: 8879576 # Original: 1234
GVC: * # 1001 * (Haier)
South High Tech 320, Then install the card and input 0000 OK
Mitsubishi net lock: * 787090 or * 787292
Mitsubishi IMSI lock: * 362628 or * 360608
Mitsubishi netsub lock: * 476989
Mitsubishi CP lock: * 482896 or * 480896
Mitsubishi SP lock: * 967678
Mitsubishi ext lock: * 574243
Philips mobile phone general secret technology
when the mobile phone is in standby mode, Please enter the following key combinations:
* # 06 # view ime string code
* # 2254 # display status line
* # 2255 # debug call mode
* # 2558 # display call time
* # 2562 # force reconnection network system
* # 7489 # display and change mobile phone password
* # 7378 # display some SIM card information, For example, phase level
* reads SIM card information, The purpose of this paper is to open or close sleep mode < br / \\\\\\\\\\\\\\alcatel) test key
In standby mode, enter & quot; 000000*" It can monitor network condition, including signal strength and channel in use
NEC db2000 mobile phone secret technology input the following keys in standby:
& quot*# 2820#"， Press the call key again to display the software version of the phone< br />"* 73738#"， Press the call key again to return the phone to the factory status
Samsung's early mobile phones, You can input the following commands to enter the test status:
key code test function / name
* # 9999 # display the software version number of the mobile phone
* 2767 * 2878 # reset the current setting of the phone (unlock the phone)
* 2767 * 3855 # reset the EEPROM of the phone (repair the software fault)
* # 9998 * 228 # battery parameter reading
* # 9998 * 289 # ring signal frequency test
* # 9998 * 246 #Program parameter display
* # 9998 * 364 # watchdog signal test
* # 9998 * 377 # EEPROM error display
* # 9998 * 427 # watchdog signal path setting
* 9998 * 523 # LCD contrast adjustment
* 9998 * 636 # storage status display
* 9998 * 786 # current date Time reading
* 9998 * 842 ᦇ vibrator vibration test
* 9998 * 947 ᦇ reset setting in case of major error
* 9998 * 9266 ᦇ display receiving channel number and receiving strength
the test instructions supported by the new Samsung mobile phone (starting from the new Samsung 600 version) are greatly reced, Basically, only the following can be successful:
* 2767 * 2878 # (EEPROM reset)
* 2767 * 3855 # (EEPROM reset, IMEI may become the initial code)
* # 9999 # (version check)
* # 0523 # (LCD contrast adjustment)
* 2767 * 7377 # (reset command for decoding mobile phone secret code)
especially for the input of * # 0523 #, some mobile phones need to insert a card, Some don't. In addition, if the input is successful once and the re input fails, it is e to the memory effect of the mobile phone software. You can remove the battery of the mobile phone, re install it and try to input it again (for example: * 2767 * 3855 ᦇ after the command is input, sometimes the mobile phone cannot be turned on without re installing the battery)
Samsung sgh-n288 mobile phone test instructions
* # 0001 # display RS232 serial communication parameters
* # 0228 # display battery capacity, voltage and temperature
* # 0246 # display program parameters
* # 0324 # network detection (engineering mode)
* # 0364 # display watchdog status, You can modify
* # 0377 # EEPROM error display
* # 0427 # watchdog signal path setting
* # 0523 # adjust the contrast and modify carefully
* ᦇ 0636 ᦇ memory capacity display
* ᦇ 0746 ᦇ SIM card file specification test
* ᦇ 0778 ᦇ SIM card information
* ᦇ 0786 ᦇ the display content is the time of this boot and the time from this boot to the current. Press - & gt; After the display of the latest boot time to the current long time; Press - & gt; After that, the last startup time is displayed; Press - & gt; The last shutdown time and the last on-off time are displayed
* # 0837 # display detailed software version
* # 0842 # vibration test
* # 0947 # reset setting instruction in case of major error
* # 9999 # display software version
* 2767 * 2878 # EEPROM reset, mobile phone settings are always cleared, which can be used to unlock
* 2767 * 3855 # take out the program from font to reset EEPROM to factory value. For the mobile phone with modified IMEI code, the original factory body number can be restored with this command. This instruction is also used for various faults caused by program disorder in EEPROM (chip)<
the secret book of Siemens Chinese machine is open to the public
Enter [* 06], you can see IMEI (International Mobile Equipment Identity) code
Enter [* 06] + [left soft key] to see the software version number. The above can be operated without SIM card
Enter [*, 0000] + [launch key] to change to the default language (English?)
input [* 0001] + [emission key] to change the display to English
input [* 0086] + [emission key] to display in simplified Chinese
input [* 0886] + [launch key] to display in traditional Chinese
fast key
long press [*] to turn on or off the ringing tone
long press to turn on or off the keyboard lock
long press [left up key] to open the profile setting
long press the left down key to turn on voice dialing
briefly press the [right recording key] to play the recorded sound, which can be played at any time, including ring the call, and can be heard by both parties
long press the [right recording key] to start recording until it is released or 20 seconds has passed
when using the keyboard lock, long press the [hang up key] to turn on the night light temporarily
double click [phone book] to enter VIP phone book
[1] + [transmit key] to access the voice mail (you need to set the voice mail service number in [menu → SMS → voice mail])
[0] + [left soft key] can switch between line 1 and line 2 (it seems that it is not supported in most areas, including Zhuhai)
[number key] + [] can display the name of the phone book stored in the SIM card (provided that at least one phone is stored in the SIM card)
long press [0] to display the + word, and you can use the left soft key to select the country's long distance code (the position is arranged according to the English name)
shortcut key setting: [number key] → [left soft key] → [right soft key] (change) options will appear, and you can select (if you select a phone number, you can enter the phone book to select the name of the phone to be quickly transmitted)
just use [number key] → [transmit key]
Siemens mobile phone lock and unlock method
please ask the netizens who need to unlock to put the unlock code in the power on State & lt; It doesn't matter whether the SIM card is plugged in or not & gt; Input the mobile phone directly, and then wait for the automatic unlocking, the time is about 1 second to 60 minutes
} how to remove the pin password of Motorola mobile phone
when you accidentally forget the pin you set, or someone else sets the pin on your mobile phone, PUK helps a lot. After the wrong pin is entered for three times, the SIM card will be displayed on the mobile phone. At this time, you must unlock it through PUK. The 8-digit PUK code is usually on the back of the big card. If you can't find it, you should go to the local customer service center as soon as possible and don't input it randomly, because PUK has only 10 chances to input the wrong number, and if you input the wrong number 10 times, the SIM card will be reimbursed. Generally, Motorola mobile phones must input * * 05 * before inputting PUK. The format is as follows: * * 05 * PUK
★ master clear and master reset of Motorola mobile phone
no matter what settings are made on your Motorola mobile phone, such as: unable to pull in and out normally, caller ID garbled, or unable to delete phonebook, etc., you can use the following methods to recover
menu + 5 + 1 (2) will display & quot; Master clear or master reset & quot; If main clear is selected, the following operations will be performed:
1. Clear this item from the phone memory
2. Clear the last call out number and the last call in number
3. Reset timepiece
functions that cannot be cleared include: fixed number table, local number table, billing table, received and outgoing short messages
selecting master reset will perform the following functions:
1. Return to the original language selection
2. The standard volume of the ring tone is restored to medium, the network search frequency is restored to medium, the automatic response is cancelled, the voice prompt meter is used, the billing is displayed ring the call, the power is saved, the hands-free is automatic, the lock is automatic, the cell broadcast and the call fax mode are used
Motorola t2688 keyboard unlocking
t2688 has the function of unlocking through the keyboard, just input: 19980722, but it only supports the current card solution, and cannot realize the full reset of the mobile phone
★ Motorola GSM mobile phone test instructions
entry of test status:
after inserting the test SIM card, turn on the power of the mobile phone, when the internal & quot; Wake up & quot; After the function is completed successfully, press & quot& quot; Key for three seconds
three seconds later & quot; TEST"， It indicates that the mobile phone has entered the test state,
the test instructions are as follows:
01: exit the test state
02xxyy: display / change TX power level DAC and load PA calibration table, Similar to ETACS 72 command
07: close RX audio channel
08: open RX audio channel
09: close TX audio channel
10: open TX audio channel
11abc: set channel ABC = 000 ~ 124
12ab
Oscilloscopes are divided into analog oscilloscopes and digital oscilloscopes. At present, most of them are digital oscilloscopes. At present, I only used the digital oscilloscopes of dingyang. Now I mainly talk about the working principle of digital oscilloscopes
digital oscilloscope is simply to collect continuous signals in pieces, and then display them in the form of waveform
The oscilloscope is mainly divided into these parts: input unit, amplification unit, acquisition and storage unit, trigger unit, data processing unit and display unit
in the past few years, colleagues in the laboratory have developed a super sensitive magnetization measurement technology, which enables them to detect a very small magnetization signal from superconcting samples with pressure more than 500 MPa. In these experiments, the researchers did not observe the saturation point, that is, with the increase of pressure, the transition temperature will continue to increase. Researchers tested different bismuth compounds known to have superconcting properties and found that the new method greatly increased the transition temperature of each compound. It's not clear whether the technology will work for all superconctors, the researchers said, but the fact that it works for three different formulations offers hope. However, it is not practical to improve superconctivity by high voltage. The next step will be to find a way to achieve the same effect by chemical doping without pressure
The difference between radio frequency remote unit and repeater:
radio frequency remote unit (RRU) brings a new distributed network coverage mode, which centralizes the large capacity macro cell base station in the available central computer room, centralizes the baseband processing, and uses optical fiber to pull the radio frequency mole in the base station to the remote radio frequency unit, It is located on the site determined by the network planning, so as to save a large number of computer rooms required by conventional solutions; At the same time, by using a large capacity macro station to support a large number of optical fiber, the conversion between capacity and coverage can be realized
Oscilloscope is a kind of electronic measuring instrument which is widely used. As the saying goes, electricity is invisible. But the oscilloscope can help us "see" the electrical signal, which is convenient for people to study the changing process of various electrical phenomena. So the core function of oscilloscope, just like his name, is to display the electrical signal waveform for engineers to find positioning problems or evaluate system performance, etc
and waveform, there are many definitions, such as time domain or frequency domain waveform, for oscilloscopes, most of the time, the measurement is the change of voltage with time, that is, the waveform in time domain. Therefore, oscilloscope can analyze the voltage change of the measured point, which is widely used in various electronic instries and fields
generally, the classification of oscilloscopes in our instry is only based on analog oscilloscopes and digital oscilloscopes. Some manufacturers may name them as other names in order to highlight a certain function of their oscilloscopes, such as digital fluorescent oscilloscopes. But its essential principle still cannot escape these two kinds of oscilloscopes
analog oscilloscope is an early oscilloscope, which is mainly based on the cathode ray tube (also known as picture tube, which was widely used in early TV sets and displays). The electron beam proced by the cathode ray tube (also known as picture tube) hits the fluorescent material on the screen to display the waveform through the horizontal deflection and vertical deflection system
③ the arm processor controls the FPGA to adjust the sampling rate of ADC, and the oscilloscope software adjusts the time base, because the storage depth is a fixed value, the sampling rate = the storage depth ÷ The time of waveform recording is usually changed by changing the sampling rate. Therefore, the sampling rate marked by the manufacturer is often effective only under the specific time base setting. In large time base, the sampling rate has to be reced e to the influence of storage depth. ADC and ram affect the other two indexes of oscilloscope: sampling rate and storage depth
Next, FPGA drives ADC to sample synchronously, and ADC converts the collected data into binary data and writes it into cache. Memory buffer is the storage depth. Generally, the size of memory is four times of the storage depth of oscilloscope identification. Because FPGA can't control the trigger of oscilloscope, the collected signal must be twice of the storage depth of identification first, and then select a section of waveform according to the trigger, so the oscilloscope can see the waveform before the trigger position. Because the oscillograph can't stop collecting the waveforms collected before screening, otherwise the waveform capture rate will be too low. Therefore, it is necessary to continue to collect the same length of sampling points at the same time After receiving the trigger instruction, the memory sends the data to the arm processor for processing. Through calculation, the oscilloscope can also imitate the multi-level brightness display similar to analog oscilloscope, and the special color temperature display effect and afterglow display effect of digital oscilloscope After the oscilloscope processes the data, it can save the current waveform image or data to the memory. It should be noted that the storage here is completely different from the high-speed storage of storage depth. Most oscilloscopes use external memory such as U disk, SD card, computer, etc. now some modern oscilloscopes have built-in large memory, which can be directly stored in the oscilloscopes In this process, ②, ③ and ④ are parallel processing
e to the restriction of the processing speed of digital oscilloscope, it can not guarantee that the waveform of the measured signal can be continuously displayed on the screen in real time, and there will be waveform data loss between the two waveforms displayed, that is, the dead time, which is also the biggest disadvantage of digital oscilloscope compared with analog oscilloscope. However, with the enhancement of the oscilloscope's computing power and the rising of the waveform capture rate, this shortcoming is slowly being made up
The abbreviation of "electronic control steering system" is ECs, and its full name is electronic control steering system.
the traditional automobile steering system is a mechanical system. The steering movement of the automobile is realized by the driver controlling the steering wheel and transferring it to the steering wheel through the steering gear and a series of rods
Since 1950s, hydraulic power assisted system (HPS, see power steering system) has been added, which is still widely used. Due to the development of electronic technology, more and more electronic components are used in automobile steering system, such as electronic hydraulic power steering, electric power steering, front wheel active steering and steer by wire
extended data:
classification:
electro hydraulic power steering can be divided into two categories:
electro hydraulic power steering (EHPS) and electro hydraulic power steering (ECHP)
EHPS is developed on the basis of hydraulic power steering system, and its characteristic is that the original hydraulic power pump driven by engine is replaced by electric motor, which can save fuel consumption. EHPS is composed of electric control device on the basis of traditional hydraulic power steering system. The power characteristic of the electro-hydraulic power steering system is that the driver can operate the car more easily and more quicklythe power assist characteristic refers to the law that the power assist changes with the changes of vehicle motion and force conditions (vehicle speed and steering wheel hand force). For hydraulic power steering, the power assist is proportional to the hydraulic oil pressure, so the power assist characteristic is generally expressed by the curve of the relationship between hydraulic pressure and steering wheel torque (and vehicle speed)
for electric power steering, the power supply is directly proportional to the DC motor current, so the power supply characteristics can be expressed by the curve of motor current, steering wheel torque and vehicle speed. The ideal assist characteristics should be able to fully coordinate the relationship between steering portability and road feel, and provide the driver with the same and empty steering characteristics as far as possible
under the condition of meeting the steering portability, if the road feel intensity remains unchanged in the whole assist characteristic area, the driver can easily determine the change of vehicle driving state and predict the required steering operating torque. It is difficult to coordinate the steering portability with the linear assist characteristics, which is related to the road feel
The characteristic offold linear assistant is an ideal way to alleviate this contradiction. The ideal assistant characteristic is a kind of broken line assist characteristic. The characteristic curve can be straight driving, strong road feeling area and light steering area
the straight-line driving area corresponds to the central area with no steering or very small steering angle, which requires large power assistance; The area of strong sense of road is between the two. The change of road dry strength corresponding to this assist characteristic is step type
Add electronic control and executive components in the hydraulic power steering system, and introce the vehicle speed (including vehicle speed and steering wheel speed) into the system, so as to realize the speed sensitive assistant hydraulic power steering
this kind of system becomes the electronic hydraulic power steering system. The modern electronic hydraulic power steering system mainly transmits the vehicle speed signal to the electronic control unit (ECU) through the speed sensor to control the electro-hydraulic conversion device to change the power steering characteristics, so that the driver's steering force changes according to the speed and driving conditions
when driving at low speed or turning sharp corners, it can operate with a small steering hand, and when driving at high speed, it can operate stably with a slightly heavy steering hand, so that the handling portability and stability can reach the most appropriate balance state