Analog To Digital

Digital oscilloscope has unique features like waveform triggering, storage, display, measurement, waveform data analyzing and processing and so on, whose usage is increasingly popular. As there is a big difference between the performance of digital oscilloscopes and virtual oscilloscopes, if used improperly, it will lead to a large measurement error and affect the test tasks, so we must pay more attention to the bandwidth. First let’s learn the differences of them.

Bandwidth is the most important indicator of the oscilloscope. Virtual oscilloscope has a fixed bandwidth, while that of digital one can be divided into virtual and digital real-time.

For repetitive signals using sequential sampling or random sampling techniques, digital oscilloscopes can achieve a maximum bandwidth that is the real-time one. The highest digital real-time bandwidth and frequency and waveform reconstruction of K-related factors (the bandwidth = high rate / K), are generally not given directly as an indicator. From their definition，we can see that virtual bandwidth is only suitable for repeated measurement of periodic signals, while the other one is suitable for signals and single signal measurement. Manufacturers claim the bandwidth of the oscilloscope can reach how much megabyte. However, they refer to analog bandwidth. Digital real-time one is less.

Therefore, when you choosing a digital oscilloscope, you should not believe the description about the bandwidth by manufactures as they refer to analog bandwidth. Especially, when measure a single signal, we must refer to the bandwidth of the oscilloscopes, or unexpected errors will occur during measurement.

youroscilloscope.com offers all kinds of digital oscilloscopes for you to wholesale. Other practical oscilloscopes are provided with cheap price as well.

Originally published here.

Whether you are an engineer, Production Manager or involved in technical work in any Electronic Industries, R& D Departments or Power Plants Digital Multimeter acts as a pillar in accomplishing ample of tasks rapidly. In today’s competitive world where everybody is busy in his/her own hustles & bustles & the entire world has become so digitized where time is the most crucial parameter so Digital Multimeter provides best solution in saving time by providing features like troubleshooting that too in a fraction of seconds. Multimeters are basically used to measure voltage, current & resistance by compiling different features in one unit & according to the requirement user can switch over to different tabs that are provided in it. Multimeters can be broadly categorized under two different categories & they are Analog Multimeters & Digital Multimeters. Analog Multimeters are basically based on Microammeter whose pointer generally moves over a scale calibration (comparing with a standard) for all different measurements that can be made but on the contrary Digital Multimeter usually display digits for all the different measurements that are performed. Multimeters are used in fault finding applications & troubleshooting electrical problems in a wide variety of Industrial & Household devices. Multimeters are used in those applications where accuracy is the prime concern. Switching over to the user’s requirement multimeters can measure Voltage (direct & alternating), capacitance, frequency, resistance, current, conductance, duty cycle, Inductance, temperature etc. Digital Multimeters are even used to test continuity in various electronic circuits (sound of beep occurs if the circuit connection is true). A wide variety of sensors that are available in the market can even be attached with multimeter for a variety of measurement like Relative Humidity, Wind speed measurement etc. Multimeters cover a wide variety of price range starting from as cheap as $10 to as expensive as $5000 depending on the features, resolution, reliability etc. the user is opting for.

Today Multimeters have replaced Galvanometer & had brought laurels in Electronics Industry.Galvanometers were primarily used to measure resistance & voltage by using wheatstone bridge & comparing unknown quantity with a reference voltage but it was very time consuming process & Galvanometers were too bulky to be handled. Replacement of Galvanometers by Multimeters is a sign of development & revolutions that are made in Electronics Industry & yet to be made in upcoming years. Digital Multimeters have found their new grounds to establish because of its very high resolution, durability & accuracy in comparison with analog multimeters. The resolution of digital Multimeter is normally specified in digits of resolution. Display count which is most popularly used regarding resolution perspective can even be specified to specify resolution. Display count usually gives the largest number, or the largest number plus one that the multimeter’s display can show, ignoring a decimal separator. For example, the display count of a 5½ digit multimeter can be displayed as a 199999 display count or 200000 display count multimeter.

Accuracy is the top most priority parameter in Electrical Measurement devices. Digital Multimeters are designed in such a manner such that they indicate accuracy as a percentage of reading in addition to a percentage of full scale value. When user needs to switch for measuring voltage than top most thing to be kept in mind is that the input impedance of the multimeter should be very high in comparison to the circuit being measured else there is a possibility that accuracy may get diminish & operations may even be complemented.

Digital Multimeters have given new wings to Electronic Industry to fly & explore & had contributed a lot in Electronic Industries. That day is not far away when with new innovative techniques & solution Digital Multimeter will dampen its roots in Electronic Industry & will be more users friendly.

Originally published here.

The introduction of digital cameras marked a landmark in the development of photography. Digital cameras are extremely different from traditional film based cameras. Film based cameras relied on the simple method of exposing a photosensitive chemical known as camera film to a scene which creates an imprinted image also known as negative.  

Digital cameras are far more advanced and use CCD (Charge-Coupled Device). CCD is an electronic device that creates an electric charge when the photons strike against a photosensitive material. This phenomenon is knows as photoelectric effect. 

Digital cameras are equipped with ‘chips’, these chips can be CCD, CMOS (Complementary Metal Oxide Semiconductor), foveon or others. These chips replace the films used in older cameras. The digital cameras also have a smart digital sensor which has ‘pixels’ laid across it. Just to give an insight into the resolution power of these sensors, a sensor with 3702×2704 pixels will have over 10 million pixels giving the camera a rating of 10 ‘Megapixels’.  

Megapixels can be deemed as the number of dots that each image is made up of. The Megapixels power of digital camera is directly proportional to the sharpness of images. Now when the light rays from a light source strikes against these megapixels, they get excited leaving an imprint behind. After this the imprinted image is made to pass through color filters which converts the image from light signals into electric analog signals. The analog signal is then finally run through an analog to digital converter which produces the final digital image. 

The produced images are then compressed and saved onto the memory chips. Digital cameras have many benefits including; 

1.      Providing the user to review the images right after taking them.

2.      Easy transfer to computer and other devices.

3.      Big memory to ensure that you never run out of space.

4.      Portability and good ergonomics.

Because of this, it looks like digital cameras are here to stay.

Originally published here.