cro oscilloscope

into general instruments, such as oscilloscopes, multimeter and other instruments, professional strong special instruments, such as old Xie Digital TV, this professional field will have a lot of special instruments, such as SFU, VM700, TG39 and so on. by function: Lao Xie The instrument is also divided into two categories, output class (signal source) and input class (measuring instrument). In the back of the content, Lao Xie will list some of the instruments, friends can follow the tw

What is the function of the diode in AC DC power? Output voltage? The output current is determined by the maximum rated current of the diode. The 1n4007 diode (Universal Silicon Rectifier diode M7) is rated at 1 A and the output current is less than 1 a. If you want to understand it, talk about it from the AC power.220 Volts AC Point has two lines, a 0 line, his voltage is always 0 volts, the other is the FireWire, the voltage is changing, a moment is 220 volts, a moment is negative 220 volts, o

Crocodile mall System Development Mr. Dong 156 micro 9242 electric 2517 same number Yi crocodile mall system app development company, crocodile mall System Software Development TIPS: The company is a software development company. It is not a platform player. In this highly competitive community, we should find proper work methods and cannot bury ourselves in the backlog of work. When we are hesitant to choose investment and project-based parties, take a nap and you may find the answer. I. Rewa

is selected from the global descriptor table. To address a local descriptor table, a Global Descriptor must be created. To access the local descriptor table, you must load the selection sub-register into LDTR (local descriptor table register), just like selecting a sub-register. This option selects the sub-access global descriptor table, and loads the base address, boundaries, and access permissions of the local descriptor table into the LDTR telling buffer store. 　　 Tables available ?? The sec

The measurement frequency of the cell in the standby mode, (different frequency band, the mobile network has two bands, GSM900 and DCS1800), 4. System Information Type 3 Cell broadcast information, you can see ATT, T3212, ACC, CRO, CRH and accmin, etc., Cheung see above 5. System Information Type 4 Cell broadcast information, here you can see the CRH, CRO, Accmin, Maxret, CB, CBQ, PT and other parameter

Threadingtest (TT) The first phase is an Android white box test tool, using offline detection method, based on the protection of User source code, the use of plug-in, fifth-generation coverage and other technologies, for development engineers and test engineers to provide a set of efficient quantifiable, visual communication tools. In contrast to other test tools, TT automatically generates the relationship between test cases and code and function coverage in automated tests, and is presented in

Imagination, the cause of a lot of problems, the actual reason only to see to find! If guessing how a failure occurs, it often fixes problems that are not bugs, wasting time and destroying other places, so don't do that. In the medical field, there are stethoscope, blood test, X-ray, B-Super method. Also in software, the method of observation is to set breakpoints, add debug statements, monitor program values, and check memory and so on. Hardware methods such as

When we try to write game applications using andengine, if we want to add rich and colorful elements to the game, but try to use particle transmitters, Andengine examples provides three examples to demonstrate the formation of two kinds of dynamic flames. The effect is very vivid. The particle emitter can form a flame. The principle can be understood as similar to that of an oscilloscope to form a graph, the particle transmitter emits custom effect el

isolate the driver, but it took some time but failed. I used an oscilloscope to observe the timing of the four lines and found that there was a problem with the USB to serial line, its sck (7-pin) Outputs a random square wave. The sck sequence from the physical serial port has a frequency of around 20 K and is continuously stable, for example, this may be a problem with the USB-to-serial chip, which is only 20 kb in frequency. Is it filtered out by d

Reproduced on: RS232, RS485 Waveform Analysis I often encounter problems with single-chip serial communication for beginners and do not know how to do it. In fact, the most effective debugging method is to use an oscilloscope to observe the waveforms of the sent and received data. Observe the waveform to determine the following situations: Whether data is received or sent Is the Data correct? Whether the baud rate is correct 1. Serial Data Format

References Before debugging: 1) debug the LCD backlight. The backlight is mainly divided into the built-in PMIC and the independent dcdc. If the backlight is the built-in PMIC, the general platform vendor has done a good job and can directly call the interface, if the driver is a separate dcdc driver, you need to use gpio to control the dcdc's en end. 2) check whether the analog and I/O power of the LCD are normal. 3) configure the control register Interface Based on the LCD resolution, RGB/CPU/

If you want to measure the execution time of a function, how can this problem be solved? I think you should all have your own methods. For me, as long as there is an oscilloscope, I must use GPIO flip and then use the oscilloscope measurement method. If no oscilloscope exists, use the Count in Systick or the Count of the timer. But after a friend's reminder, the

. Why use Mah to represent capacity? We know that the voltage value of lithium battery change is very small, generally between 3.7V to 4.2V, that is, 500mV, so we can take here to take the 4000mAh battery, if the battery with 400mA current discharge, then the battery can use 10h. The use of Mah can also reflect the battery life. Second, the purpose of power consumption debugging 1, to obtain the power consumption data in each state of the equipment, to calculate the battery s

distinguished by Fourier transforms. However, because the analysis is digital sampling, the highest frequency of the signal can be analyzed by its sampling rate, which limits the analysis of the high frequency.For now, the highest analysis frequency is at 10MHz or dozens of MHz, which means that the measurement range is from DC to dozens of MHz.Science has developed to this day, we can measure a signal in many ways, no matter what signal it is. The most basic instrument commonly used is the

conditions 1.4 Bus data transmission order and ACK response IIC bus on the data transmission room MSB before, LSB in the rear, from the oscilloscope, read from left to right in turn The IIC bus transmits the data not to accept the limit, but each send to the SDA must be 8 bits, and the host sent 8-bit after the release of the bus, from the machine received data must be pulled low SDA a clock, response ACK indicates the success of the data received,

replace, if the key press the contact is broken normal, the explanation may be due to virtual welding, desoldering or gold chip hole oxidation, can be measured along the printed line step by step, to find fault for re-welding; if the oxidation of metal pores, the oxide layer can be washed clean, And then re-weld firmly, if the metal hole is completely off and cause the circuit breaker, can be additional solder lead to connect. Common faults Three: if there are multiple keys that are not in the

address is a 7-bit address, and the address configured in the kernel is a real address, this requires special attention. Otherwise, i2c will fail, resulting in loading failure of the camera driver. After configuring the relevant information, start the camera and test it. The camera is stopped and cannot be connected to the device. Capture the related kernel log and find that the match id fails. As a result, the driver cannot be loaded, I initially suspected that the related voltage could not wo

For serial communication, the effect of setting data bit length on communication isIn the serial data communication, you will see the serial port parameter settings. Where the "Data bits" setting, there are four options, namely 8, 7, 6, 5. So how does changing this parameter affect the transfer of data?I'm going to do an experiment, through the oscilloscope to observe the communication process, can analyze the results as follows:For example, the data

signals: Purchase a separate Ad/da module, voice compression chip AMBE2000, speech coding chip CMX649 2. Refer to TI's book 4.3.5 The PN Code Spread spectrum, DDS, Ad/da, demodulation, expansion and other circuit modules to build a complete circuit (difficult on the frame)* * Also, complete spectrum analysis topics2nd phase 2015-7-22one, the infrared optical communication One problem1. Analog part: complete voice transmission over two meters. Commissioning Process: Before

R ) configuration bits. after the plli2s is enabled, the configuration parameters cannot be changed. Ⅲ, Code AnalysisTake the stm32f4x5, X7 series of chips as an example to analyze the configuration of the system clock.Reference Software Engineering:https://yunpan.cn/cRepWDShSK4yc access password 65b11. Frequency multiplier parametercombined with the above clock tree and source code can be seen, the system clock PLLCLK The main calculation is the configuration Pll_m , Pll_n , pll_p these three