UA133152U - DIGITAL oscilloscope based on the sound card of a computer - Google Patents

Abstract

The digital small-scale oscilloscope contains an analog-to-digital converter (ADC), an attenuator, a personal computer. A computer sound card with a TRS connector is used, has two input channels, each with a probe needle, two ground terminals, and an attenuator designed to operate up to 500 V.

Description

The useful model belongs to electrical measuring equipment, namely to the field of analog-to-digital conversion of signals of various shapes and amplitudes for their further visualization, analysis and registration in digital form.

Traditional devices for observation and analysis of analog signals are oscilloscopes based on electron beam tube (EBT).

A well-known memory oscilloscope with digital measurement of signal parameters, which is read by |11.

The disadvantage of this device is the complex implementation scheme of analog-to-digital signal conversion, which consists of 15 blocks. In addition, an electron beam tube is used, which has an adverse effect on the researcher's body (flickering of the screen, presence of harmful radiation).

A known device for measuring low-frequency voltage (2), which consists of a voltage divider, a scaling amplifier, an instrumental amplifier with a programmable signal gain, a protector, an analog-to-digital converter (ADC), first and second buffer elements, FPGA, first and second displays, keyboard, UTAai, decoder, configuration device, clock generator, analog and digital power sources.

The disadvantages of this device are the complexity of the design and high cost with low informativeness of signal parameters.

A well-known digital oscilloscope for recording, researching and measuring the parameters of radio technical signals of various forms |Z, which contains an input device, a sampling and storage device, an ADC, an operational device, a memory register, a synchronization circuit, an address counter, a display device, a digital scale-out counter , control device, clock pulse generator, block with charging connection, pulse shaper, conversion pulse generator, logic addition circuit, conversion pulse counter, blocking block, commutator, frequency divider, switching block.

The disadvantage of this device is the complexity of the design with low informativeness about signal parameters.

A digital compact OV oscilloscope is known, which contains an input circuit and an ADC (4).

Additionally introduced housing, probe-needle, OV cable, ground wire, two-color LED, multi-function button, input buffer amplifier, attenuator, reference voltage source, battery, power voltage stabilization unit, amplifier, digital-to-analog converter, OS/OS converter, low-pass filter, O58 controller.

Disadvantages of the digital compact О5В oscilloscope, which contains an input circuit and an ADC, include: - the presence of only one working channel; limitation of the maximum input voltage to 50 V; - the relatively high cost of components for assembling the device, due to the need to purchase an ADC; - the complexity of the design.

This method is considered the closest analogue.

The task of a useful model is to create a digital oscilloscope with a simplified design, increased informativeness of signal parameters and a reduction in the cost of the design as a whole.

The task is solved by the fact that a digital small-sized oscilloscope, containing an analog-to-digital converter, an attenuator, a personal computer, and an ADC of a computer sound card with a TNA5 connector is used, has two input channels, each of which has a probe-needle , two grounding terminals and an attenuator designed for operation with a voltage of up to 500 V.

The use of an analog-to-digital converter of a computer sound card in a small-sized digital oscilloscope simplifies its design and reduces its cost.

Introduction of a second input channel and an attenuator designed for operation with voltages up to 500

B, increases the informativeness of signal parameters.

The structural diagram of the device is shown in Fig. 1. The oscillogram of pulse current passing through a metal sample depending on the operating voltage is presented in Fig. 2.

The proposed device contains two probe needles 1 (Fig. 1), two grounding terminals 2, an attenuator 3, designed to work with an input alternating voltage of up to 500 V, a TNA5 3.5 mm connector 4, which is connected to the input of the Ipe ipri or Miss ipriy sound card 5 of a personal computer 7.

ADC (6) of a computer sound card is used to convert an analog signal into a digital one.

The attenuator division factor for each channel may differ depending on its purpose: -171 - maximum operating voltage "5 V; - 1:10 - maximum working voltage "50 V; - 1:100 - maximum working voltage "500 V.

The sampling frequency and bit rate of the ADC depends on the class of the computer's sound card and is in the range of 20-192 kHz and 8-24 bits, respectively.

The device works as follows. The analog signal, which is measured between the end of the probe needle 1 and the grounding terminal 2, passes through the attenuator 3, as a result of which its amplitude is reduced to a safe value for the sound card of a personal computer.

The attenuated signal from the attenuator C through the TA5 3.5 mm connector 4 is fed to the inputs and IPE iprii or Mis iprii of the computer sound card 5 and with the help of the ADC 6 of the computer sound card is converted into a digital signal, which is converted into a digital signal using an emulator program we observe on the screen of a personal computer monitor 7 and register in the form of a figure or table. To work in two-channel mode, the presence of a stereo microphone input of a sound card is required.

The operation of the device was verified during experiments on electroimpulse processing of ZP-718ID alloy samples. Mizza was used as an emulator! Apaiuzeg, which is in the network of Ipieteia in free access. The method of direct discharge of a battery of capacitors through a metal sample was chosen to obtain electric current pulses. The total capacity of the capacitors is 400 μF, the maximum operating voltage is 10 KV, the maximum stored energy is 20 kJ. An additional resistance (75 mV, 300 A) was used to determine the pulse current parameters.

A characteristic oscillogram of pulsed current passing through a metal sample depending on the operating voltage is presented in Fig. 2.

Thus, the proposed device based on a PC sound card is suitable for solving many scientific and research problems, besides, it is an order of magnitude cheaper than modern professional ADC oscilloscopes on the market.

From the sources of information: 1. A.s. 866502 USSR, IPC c0O18 02/29. Memory oscilloscope with digital measurement of read signal parameters |Hext| /"V.N. Svitenko, V.V. Kulemza; statement 12.12.79; published 23.09.81, Bull. Mo 35. - 5 p. 2. Application 2004131374 of the Russian Federation, IPC СО01А 19/00. Device for measuring low-frequency voltage (Text) /V.K. Shukhostanov, V.E. Akinin; published 10.04.2006.

Z. Pat. 2010238 of the Russian Federation, IPC SOVA 13/20. Digital oscilloscope (Zlektronnyi resursi /A.G.

Milekhin, A.M. Kuznetsov; statement 04/03/92; published 30.03.94. - Access mode: pOru/Limlu teraiepi. gy/raiepiv/2010238. 4. Pat. 2402024 of the Russian Federation, IPC SOTA 19/00. Digital small-sized O5V oscilloscope | Texts / V.N. Pryanishnikov, D.V. Pryanishnikov, V.V. Sosnov, P.Yu. Shershukov; statement 10.08.09; published 20.10.10, Bull. Mo. 29. - 11 p.m.

Claims (1)

USEFUL MODEL FORMULA 45 A digital compact oscilloscope containing an analog-to-digital converter (ADC), an attenuator, a personal computer, characterized by the fact that it uses the ADC of a computer sound card with a TA5 connector, has two input channels, each of which has a probe - a needle, two grounding terminals and an attenuator designed for operation with a voltage of up to 500 V.