Oscilloscope USB with your hands: a diagram, reviews

The USB oscilloscopes are designed to track the electrical signal in the circuit. Models are used in various fields. If we consider single-channel modifications, they are often used to test equipment. For the purpose of tracking the gigahertz frequency they are not suitable.

Two-channel devices are used to monitor electromagnetic oscillations. Modern models are produced with photographic tape. Three-channel devices are suitable for the study of gigahertz frequency. To find out more information about oscilloscopes, it is necessary to consider the scheme of the standard model.

Scheme of a simple oscilloscope

A typical USB oscilloscope (shown below) includes an electromagnetic tube, as well as a modulator. The expander is most commonly used as a transient type. Condensers in devices are used without transistors. If we consider modifications with modulators, then they have a pentode. To reduce the threshold voltage, a rectifier is used. Filters in devices are installed with dinistors. The sensitivity of the oscilloscope depends largely on the type of transceiver.

Single-channel model

The single-channel USB oscilloscope is quite simple. In this case, the cathode-ray tube is installed together with the wave modulator. Many experts say that the capacity of the element should be no more than 10 microns. It is also important to use a tetrode to reduce the sensitivity of the device. The expander for the oscilloscope is selected by output type. The parameter of the threshold voltage for the element must be 20 V.

The limiting frequency of the expander of this type does not exceed 130 Hz. To install filters you will need to use a soldering iron. Stabilizers for models 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 can not do without a rectifier.

Dual-channel device schematic

Using a dipole modulator, you can make a two-channel USB oscilloscope with your own hands. The circuit 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 accuracy of measurements.

For the purpose of connecting the triode, a transceiver is installed. Also, the circuit of a two-channel USB oscilloscope includes transducers. 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, a high-quality operating filter is required. At the end of the work, the controller is attached. Output contacts to the USB port are connected via a transceiver.

Reviews about three-channel modifications

Three-channel USB oscilloscope reviews from experts condemn good. First of all, it is important to note that such devices are characterized by high accuracy of indications. The 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 voltage jumps, a conventional rectifier is used.

If you believe the experts, the indicator of negative resistance in the oscilloscope should not exceed 30 ohms. Also, the threshold voltage parameter is checked before switching on the modification. For a simple model, it must be no more than 35 V. To install a triode on the model, a contactor is soldered. Many devices use it without a regulator.

Assembling the device for 5 V

With a contact extender, you can make a simple USB oscilloscope with your own hands. The device layout includes a cathode-ray tube and a modulator. To solve the problems with overloading in the network, filters are used. Controllers are most often selected wire type. A thyristor is required for the proper operation of the capacitors. To install it you will need to use a soldering iron.

If you believe the experts' opinions, then it is better not to use cassette analogs in this case. It is also important to note that it is forbidden to set tetrodes in a USB oscilloscope. First of all, this is 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 via the modulator.

Oscilloscopes for 10 V

The 10 V oscilloscope circuit includes two wire capacitors. To build the model, it is important first of all to start installing the cathode-ray tube. A transient modulator is used for normal operation of the sensor. It is installed in the USB oscilloscope through the winding. Some modifications have a thyristor. If you believe the opinions of experts, these models do not have a high accuracy of indications. In this case, it is more expedient to select high-quality comparators.

The current conductivity of the elements must be at least 6.2 microns. The parameter of threshold sensitivity of oscilloscopes at 10 W fluctuates around 30 Ohm. On average, the operating frequency is not more than 130 Hz. If you believe the experts' feedback, you can not use pass-through filters. First of all, they give a big load to the capacitors. It is also important to note that they are not able to fully cope with electromagnetic fluctuations.

How to make a model for 15 V?

Making a USB oscilloscope for a 15V computer is quite simple. To build the model, we use a conventional cathode-ray tube. However, it is important to note that it is more expedient to select a modulator with an adapter. In the market the devices are represented by 10 and 15 microns. If we consider the first option, then the capacitors are used with a thyristor.

The negative resistance of oscilloscopes is at most 25 m. If we consider modifications with an adapter of 15 microns, then the capacitors are allowed to use only an open type. To deal with electromagnetic interference are the linings. Converters in devices of this type are used in low frequency. To improve the accuracy of the measurement readings, rectifiers are used.

Using resistors of series ППР1

Oscilloscopes with these resistors are in great demand. Take these modifications to single-channel devices. Oscilloscopes are most suitable for testing electrical equipment. It is also important to note that they are highly sensitive. To make the model yourself, you will need a cathode-ray tube.

In this case, the modulator is of the impulse type. If you believe the reviews of consumers, contactors are more advisable to choose with an overlay. However, before installing them, a rectifier is installed. In order to display the readings correctly, the kenotron is used. To date, this device is produced operational and wave type.

If we consider the first option, then to build the oscilloscope you will need a controller. Modifications with wave kenotrons are very rare. The resistance parameter of the equipment does not exceed 33 ohms. The signal conductivity index of the models fluctuates around 4.5 microns. It is also important to note that the USB port is allowed to be connected via a modulator.

Feedback about models with resistors ППР3

Oscilloscopes with these resistors differ in their sensitivity. In this case, modulators are used only for low conductivity. As a rule, the output voltage parameter does not exceed 15 V. On average, the signal is 6 μm. Expanders for devices are selected impulse type. In order to assemble the 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. To solve problems with a low frequency tetrodes are used. Directly the resistors are installed without the lining. At the end of the work, a USB port is soldered to connect the equipment to the network. With sudden voltage surges, you need to install a stabilizer. This device is capable of operating without an amplifier. To minimize heat losses, a comparator is used.