laser pointer is necessary to the large scale examination

laser pointer  is necessary to the large scale examination.
Powerful data processing capabilities. Greatly increased computing speed digital signal processing theory and the rich and perfect, so that virtual machines can quickly and accurately process the data. Virtual PC, a powerful instrument to use graphical environment and online help, create a virtual instrument panel, complete instrument control, data analysis and display, instead of the traditional instruments, changing the use of traditional instruments, greatly improved the instrument's functionality and efficiency, greatly reduced the price of the instrument, allowing users to customize according to their function of the instrument; can be said that the emergence of virtual instruments "instrument" concept to a new era. Virtual instrument widely used in electronic measurement, electrical engineering, materials mining exploration, medical, vibration analysis, acoustic analysis, fault diagnosis and teaching and research and other areas. The inspection report of laser pointer  needs the signature of the director of laser pointer  workshop.
The most common application of virtual instrument should be said to replace the traditional desktop machines. With the plug-in data acquisition card and trigger the continuous improvement of performance improvements in technology, virtual instrument technology makes the traditional desktop machines gained new life. Replaced by the virtual instrument of traditional instruments, the most common is the oscilloscope. Developed through the use of virtual instrumentation software development process out of virtual instruments, data acquisition card, the user can adjust the action, so that the software the same as a desktop display filter output waveform, while the virtual oscilloscope can also be a number of analysis. The dispatcher has prepared the working time table of laser pointer  well. 
Auto-zero phase, analog input (measured voltage) integration stage, the anti-integration phase of the reference voltage, the integrator zero phase. Various stages of the process is as follows: auto-zero phase: at least 9800 clock cycles. At this stage, the internal IN + and IN-input pin is disconnected, and is internally connected to analog ground. Reference capacitor is charged to the reference voltage, then into a closed-loop system, auto-zero capacitor is charged to compensate for the buffer amplifier, integrator and comparator offset voltage; analog input integrator stages: BUSY output goes high, auto-zero loop is opened, the internal IN + and IN-is connected to an external output pin. The price is low enough for this kind of laser pointer  .
The input differential voltage points 10000 clock cycle, the integrator capacitor charging voltage is proportional to the external signal voltage and integration time; reference anti-integration phase: the maximum is 20 001 clock cycles, the internal IN-is connected to analog ground, IN + jumper to the previously charged reference capacitor, the integrator of the voltage reference points. When the integrator output returns to zero, BUSY signal goes low. Decimal counter ICL7135 internal clock pulse at this stage of the count, the count value of 10 000  Vin  VRef, is the analog input of A  D conversion results; integrator zero phase: to be 100 to 200 clock cycles, the internal The IN-is connected to analog ground, connected into a closed-loop system so that the integrator output returns to zero.