multimeter vom

 2014 TI Cup undergraduate electronic Design competition regional competition use of instruments and devices, equipmentA) 3a/30v two-way regulated power supply (can be paralleled);b) 60MHz oscilloscope;c) Three-bit half-digital multimeter;d) Low frequency (10MHz) signal source;e) Low frequency AC millivolt meter.1. ay-ldc1000 Evaluation Board (must be used in the game, TI according to the number of registrations 30% allotted).2. AY-TPA3112D1 Evaluat

Article excerpt from: http://bbs.eeworld.com.cn/thread-370591-1-1.htmlI. Structure and driving principle of hybrid stepping motorThe principle of the motor this part does not want to talk about too complicated, open a motor to see the understanding.The rotor of the motor is a permanent magnet, and it has several poles on it, which are fixed at a certain angle. The stator of the motor is a magnet consisting of several coils in series. The outgoing line is usually four lines marked as a+,a-,b+,b-.

the progress of the new project and demand, the general will wait until the product stability, this piece of the problem found many are not serious problems, but once there is an important problem will lead to the product function can not be used, the service side of the bug fix will soon.Core TestingWhat is a core test? Imagine the intelligent hand ring motion detection is not accurate, OBD will make a static car loss of electricity, intelligent blood pressure monitor to detect the wrong BP an

using a multimeter, you have to maintain a certain rotational speed for a few seconds and compare the voltage value and the 0-rate voltage value at the same time. If the value is greater than 0 rate the voltage value that indicates that the direction of rotation is positive.the third part is to synthesize them together. The data of the accelerometer and gyroscope are fused. If you are reading this article you may already have or are ready to purchase

floats.So let's take a look at what we've got to conclude: 1. The previous three pins appear to be TX, Rx, and GND. 2. One that looks much like Gnd (the 4th position in the right place) 3.tx-is used for data transmission 4.rx-is associated with another place. Of course, in order to verify, I need to try different permutations and combinations, then you need to Usb-uart, that is, the next computer to convert the USB data to the UART data. Below you can use an oscillosco

1.1GS/S refers to the sampling rate of the oscilloscope, the front s is the meaning of sample sampling, followed by S is the second, that is, the oscilloscope sampling 1G points A second, 1G is 10 of 9 square. That is, a single ad sample can be completed within 1ns.2. Transducers with high input impedance are usually selected, and the probes are divided into active and passive. The application is more passive, Probe comp is the meaning of probe compensation.3.FFT is a fast Fourier transform anal

timing of the gas is inaccurate.10. Exhaust gas is obstructed, the inlet manifold vacuum is obviously low when the engine is loaded.(iii) General steps for fault checking1. Fault self-diagnosis, check for trouble-free code appears. If you have the condition, use a special diagnostic instrument to read the dynamic Data stream, or to check the data with a multimeter. Sensors and actuators that affect power are: coolant temperature sensor, air flow mete

support power-saving}By default, power is always on and we need to switch to battery-powered mode. At the same time Pwrmgr_task_state = 0 indicates that all tasks support power saving. 5, if you want to be more power-saving, need to be unused peripherals shut down, normal IO internal pull-up. To do the above five points, CC2530 Zstack can achieve a true low-power mode, currently only with 0.1ma multimeter test, only test to the lowest 0.1ma, after th

The basic system of STM32 mainly involves the following parts:First, power1), regardless of whether the use of analog and ad parts, the MCU outside of VCC and Gnd,vdda, Vssa, Vref (if the package has this pin) must be connected, not floating;2), for each group of the corresponding VDD and GND should be placed at least a 104 ceramic capacitor for filtering, and the capacitor should be placed as close as possible to the MCU, 3), with a multimeter test s

me a night to make it.Later there was contact with the electricity themselves began to buy some, multimeter, soldering iron, rosin, resistance back to their own welding things finished. Also put their own repetition machine, at that time is want to do a radio, later still did not make, now think not to do out very normal to junior high school those physics knowledge to make a radio or difficult.At that time most of the pocket money was spent on buyin

series resistor (2.2 Ohm in Fig 1), then dividing by the resistance value is the current.For example, the purple black line is the super capacitor began to discharge the voltage curve, the pink line is the voltage at both ends of the series resistor.Fig 4:waveforms for ESR measurementL Leakage Current TestFig 5:measurement setup for leakage currentFig 6:picture of Super capacitor leakage measurement SetupThis principle is very simple, to the capacitor charge good power, and then use a

Hardware Connection Process 1675.3.4 LCD Library 1715.3.5 Software 1735.4 Summary 1746th Sound Project 1756.1 Project-Network Radio 1756.1.1 USB sound card 1756.1.2 Software 1776.2 Items--Music player 1796.2.1 Components List 1806.2.2 Circuit Connection 1806.2.3 Software 1836.3 Item 3– Volume indicator 1856.3.1 Components List 1856.3.2 Circuit Connection 1866.3.3 Software 1896.4 Summary 191Chapter 7th Tools and Tricks 1927.1 Data Sheet 1927.1.1 Data Sheet Differences 1927.1.2 Element Introducti

reference only:constant temperature electric soldering iron, knife tip and cone tip;High purity alcohol (cleaning), toothbrush (SPA);Hot Air Soldering station, for SMD Welding, for soldering iron temperature is not enough, can help increase some welding temperature. smoking Miriam, absorbing welding is the smoke that protects your lungs and eyes. suction tin wire, for solder patches, use suction away excess solder. Flux , rosin, solder paste must use strong flux, the effect of leverage! Rosin i

Spectrum Analyzer is the use of frequency domain to analyze and study the signal of a measuring instrument, for signal analysis it is indispensable, with the rapid development of communication technology, more and more field operations need to support the spectrum instrument (Spectrum Analyzer type), such as communication transmitters and interference signal measurement, spectrum monitoring, The characteristics of the device and so on, the application of a wide range of applications, and all wal

the addition of delay-stabilized power supply, there will be no longer the fault.2. The temperature in the box has not reached the set temperature has stopped workingExclusion method: Although the set temperature is not reached in the box, the panel display temperature has reached the set temperature. This is due to the temperature of the thermistor damaged, need to replace the accessories. If you do not have the original parts, you can reinstall a temperature control system to eliminate the fa

power supply may be damaged. Change the power supply. If the power supply fan rotates, the fault may be caused by the switch circuit fault of the motherboard. Then, use a multimeter to test the switch circuit of the motherboard and eliminate the fault. When there are too many other users, there are too many other users who want to handle these issues. Some Fault Causes for no boot: 1. replug the video card to troubleshoot the fault. The memo

disconnection. Transceiver InstallationA. Select the position where the transceiver is installed on the crude cable (the transceiver is installed on the crude cable, and the shortest distance between the two receivers is 25 meters );B. Use a transceiver to install a dedicated tool to drill holes on the crude cable. When drilling, drill holes must be located in the middle of the crude cable and drill to the end (that is, drill all the bit holes );C. install the transceiver connector. the trans

: "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

connected to prevent the static electricity on the body from penetrating the CPU and causing damage. Another scientific method is to use a multimeter with a temperature sensor to detect the temperature of the processor. The appropriate temperature varies depending on the type and model of the processor. But in general, the temperature should be less than 110 degrees. If you find that the processor test is higher than this temperature, check whether

of kilobytes (kΩ) or megabits (MΩ. 1 k Ω = 1000 Ω, 1 m Ω = 1000000 Ω. The resistance of a conductor is determined by the material, cross-sectional area, and length of the conductor.The resistance can be measured in the Ohm of a multimeter. During measurement, select an ohm which is close to half of the deflection of the electric meter pointer. If the resistor is in the circuit, you need to burn one of the resistors before measuring. Ohm's Law:The c