Automatic Measurement of Digital Oscilloscope

A digital oscilloscope is a general-purpose test instrument, which is essentially a graphic display device, equivalent to a voltmeter or multimeter with a graphic display. It can intuitively display the waveform of the signal changing over time on the screen, and measure and analyze the waveform's period, voltage, frequency and other parameters. It is widely used in various fields such as scientific research and production. It is the main test instrument for engineers to design, debug and repair products, and plays a vital role in testing work.

The working mode of a digital oscilloscope is to convert the measured voltage into digital information through an analog-to-analog converter (ADC). A digital oscilloscope captures a series of sample values ​​of a waveform and stores the sample values. The storage limit is to determine whether the accumulated sample values ​​can depict the waveform. Subsequently, the digital oscilloscope reconstructs the waveform.

Digital storage oscilloscopes offer economical performance in a compact design. With a variety of standard features including USB connectivity, 34 automatic measurements, limit testing, data logging, frequency counter, trending, and context-sensitive help menus, the TBS1000B Series oscilloscopes can help you get more done in less time.

The hardware part of the digital oscilloscope system is a high-speed data acquisition circuit board. It can realize dual-channel data input, and the sampling frequency of each channel can reach 60Mbit/s. From the functional point of view, the hardware system can be divided into: signal front-end amplification (FET input amplifier) ​​and conditioning module (variable gain amplifier), high-speed analog-to-digital conversion module (ADC driver, ADC), FPGA logic control module, clock distribution, high-speed comparator, single-chip control module (DSP), data communication module, LCD display, touch screen control, power and battery management and keyboard control.

After the input signal is converted by the preamplifier and gain adjustable circuit, it becomes the input voltage that meets the requirements of the A/D converter. The digital signal after A/D conversion is cached by the FIFO in the FPGA or acquisition memory, and then transmitted to the computer through the communication interface for subsequent data processing, or directly controlled by the microcontroller to display the collected signal on the LCD screen.

main feature:

7-inch WVGA (800X480) active TFT color display

34 automatic measurements

Dual-window FFT, simultaneous monitoring of time domain and frequency domain

Dual Channel Frequency Counter

Zoom function

Automatically expand data logging capabilities

Autoset and autorange functions

Multilingual user interface

Small and lightweight – only 4.9 inches (124 mm) deep and 4.4 pounds (2 kg) Connectivity

USB 2.0 host port on the front panel for quick and easy data storage

USB 2.0 device port on rear panel for easy connection to PC

Classification by structure and performance

① Ordinary oscilloscope. It has a simple circuit structure, narrow frequency band, poor scanning linearity, and is only used to observe waveforms.

②Multi-purpose oscilloscope. It has a wide frequency band and good scanning linearity. It can perform quantitative tests on DC, low frequency, high frequency, ultra-high frequency signals and pulse signals. With the help of amplitude calibrator and time calibrator, the measurement accuracy can reach ±5%.

③ Multi-line oscilloscope. It uses multi-beam oscilloscope tubes and can display the waveforms of more than two signals of the same frequency on the fluorescent screen at the same time, without time difference and with accurate timing relationship.

④Multi-trace oscilloscope. It has the structure of electronic switch and gate control circuit, and can display the waveforms of more than two signals of the same frequency on the fluorescent screen of a single beam oscilloscope tube at the same time. However, there is a time difference, and the timing relationship is not accurate.

⑤ Sampling oscilloscope. It uses sampling technology to convert high-frequency signals into analog low-frequency signals for display, and the effective frequency band can reach GHz level.

⑥Memory oscilloscope. Using storage oscilloscope or digital storage technology, single electrical signal transient process, non-periodic phenomenon and ultra-low frequency signal are retained on the fluorescent screen of the oscilloscope or stored in the circuit for a long time for repeated testing.

⑦ Digital oscilloscope. It has a microprocessor inside and a digital display outside. Some products can display both waveforms and characters on the oscilloscope screen. The measured signal is sent to the data storage device through the analog-to-digital converter (A/D converter). Through keyboard operation, the captured waveform parameter data can be added, subtracted, multiplied, divided, averaged, squared, and root-mean-squared, and the answer number can be displayed.