USB oscilloscopes are designed to track an electrical signal in a circuit. Models are used in various fields. If we consider single-channel modifications, then they are often used to test equipment. For the purpose of tracking the gigahertz frequency, they are not suitable.
Dual-channel devices are used to observe electromagnetic waves. Modern models are produced with a photo tape. Three-channel devices are suitable for gigahertz frequency research. To learn more about oscilloscopes, you need to look at the diagram of the standard model.
Scheme of a simple oscilloscope
A typical USB oscilloscope (diagram shown below) includes an electromagnetic tube as well as a modulator. The expander is most often used of the transitional type. Capacitors in devices are used without transistors. If we consider modifications with modulators, then they have a pentode. A rectifier is used to lower the threshold voltage. Filters in devices are installed with dinistors. The sensitivity of an oscilloscope depends largely on the type oftransceiver.
Single-channel model
A single-channel USB oscilloscope is quite easy to make. In this case, the cathode ray tube is installed together with the wave modulator. Many experts say that the bandwidth of the element must be no more than 10 microns. It is also important to use a tetrode to desensitize the device. The expander for the oscilloscope is selected as an output type. The threshold voltage parameter of the element must be 20 V.
The maximum frequency of this type of expander does not exceed 130 Hz. To install the filters, you will have to use a soldering iron. Model stabilizers are rarely used. To solve problems with increased resistance on the plate, you can use a converter. The standard circuit of a single-channel oscilloscope does not do without a rectifier.
Scheme of a two-channel device
With the help of a dipole modulator, you can make a two-channel USB oscilloscope with your own hands. The scheme of the device includes a cathode ray tube and an amplifier. If we consider the standard modification, then the rectifier is not required. The main advantage of the model is the high measurement accuracy.
In order to connect the triode, a transceiver is installed. Also, the dual-channel USB oscilloscope circuit includes converters. They are selected for 20 or 25 V. If we consider the first option, then capacitors are allowed to use an open type. In order to install a 25 V converter, you will need a qualityoperational filter. At the end of the work, the controller is attached. Output pins with a USB port are connected through the transceiver.
Reviews on three-channel modifications
Three-channel USB oscilloscope reviews from experts deserve good. First of all, it is important to note that such devices are highly accurate readings. Their sensors are used with different conductivity. The cathode ray tube is usually installed with an amplifier. For many modifications, capacitors are used without filters. In order to solve problems with power surges, a conventional rectifier is used.
According to experts, the negative resistance of the oscilloscope should not exceed 30 ohms. Also, before turning on the modification, the threshold voltage parameter is checked. For a simple model, it must be no more than 35 V. In order to install the triode on the model, a contactor is soldered. Many devices use it without a regulator.
Assembling a 5V device
With a pin expander, you can make a simple DIY USB oscilloscope. The scheme of the device includes a cathode ray tube and a modulator. Filters are used to deal with network congestion problems. Controllers are most often selected wired type. For the normal operation of the capacitors, a thyristor is required. To install it, you will have to use a soldering iron.
If you believe the reviews of experts, then it is better not to use cassette analogues in this case. It is also important to note that the tetrodes in the USB oscilloscopeinstallation is prohibited. This is primarily due to a sharp increase in negative resistance. Also, models with these elements consume a lot of electricity. Modifications based on broadband rectifiers are rare. At the end of the work, it is important to fix the output contacts. The USB port for connection is most often installed through a modulator.
10V Oscilloscopes
The 10V oscilloscope circuit includes two wire capacitors. To assemble the model, it is first of all important to install the cathode ray tube. For normal operation of the sensor, a transient modulator is used. It is installed in the USB oscilloscope through the winding. Some modifications have a thyristor. If you believe the reviews of experts, then these models do not differ in high accuracy of readings. In this case, it is more expedient to select high-quality comparators.
The current conductivity index of the elements must be at least 6.2 microns. The threshold sensitivity parameter of 10 W oscilloscopes fluctuates around 30 ohms. On average, the operating frequency is no more than 130 Hz. If you believe the reviews of experts, then through-pass filters cannot be used. First of all, they put a large load on the capacitors. It is also important to note that they are not able to fully cope with electromagnetic vibrations.
How to make a 15V model?
Making a 15V USB oscilloscope for a computer is pretty easy. To assemble the model, a conventional electronicbeam tube. However, it is important to note that it is more expedient to select a modulator with an adapter. On the market, devices are presented at 10 and 15 microns. If we consider the first option, then capacitors are used with a thyristor.
The negative resistance index for oscilloscopes is maximum 25 m. If we consider modifications with a 15 micron adapter, then only open-type capacitors can be used. Covers are used to combat electromagnetic interference. Converters in devices of this type will be used at low frequency. Rectifiers are used to improve measurement accuracy.
Using PPR1 series resistors
Oscilloscopes with the indicated resistors are in high demand. These modifications are referred to as single-channel devices. Oscilloscopes are most suitable for testing electrical equipment. It is also important to note that they are highly sensitive. To make your own model, you will need a cathode ray tube.
In this case, the modulator is of the pulse type. If you believe the reviews of consumers, then it is more expedient to select contactors with a lining. However, a rectifier is placed before their installation. In order to correctly display the readings, a kenotron is used. To date, this device is produced operational and wave type.
If we consider the first option, then a controller is required to assemble the oscilloscope. Modifications with wave kenotrons are very rare. Parameterthe resistance of the equipment does not exceed 33 ohms. The signal conductivity indicator for models fluctuates around 4.5 microns. It is also important to note that the USB port can be connected via a modulator.
Reviews on models with PPR3 resistors
Oscilloscopes with the specified resistors are highly sensitive. In this case, modulators are used only with low conductivity. As a rule, their output voltage parameter does not exceed 15 V. On average, the signal reducibility is 6 microns. Expanders for devices are selected pulse type. In order to assemble a USB oscilloscope yourself, you will need a cathode ray tube. After fixing it, a modulator is placed.
The expander must be fixed near the comparator. Tetrodes are used to solve low frequency problems. Resistors are installed directly without lining. At the end of the work, a USB port is soldered to connect the equipment to the network. With sudden power surges, you need to install a stabilizer. The specified device is able to work without an amplifier. A comparator is used to minimize heat loss.
