XDM Series Capacitance Bench Multimeter

XDM Series Capacitance Bench Multimeter

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4 inches LCD display, more vision to check the data, support dual display. Trends and chart mode display.

FAQ

How to know whether the oscilloscope is accurate?

It’s enough for engineer when the waveform captured by oscilloscope occupy 2 divisions of the display area. They don’t think it’s necessary to zoom the waveform to a full screen size. And it’s wrong actually. Today we’ll see why we need to put the waveform at full size of the screen.

The difference between 2 division and full screen display is that the waveform would be “extended”. This cause the change of vertical scale value, which influence the accuracy of vertical measurement. The relation between 8-bits ADC and vertical measurement appears mostly important.

Take the ruler for example, if you take 1m ruler to measure 1.6cm object, it will be 2cm at result. And if you use 10cm ruler, it will come to 1.6cm. This is to say, the smaller the measure unit, the more accurate it is. 

So, how does the change of vertical scale value influence the accuracy of measurement?

1. Influence from vertical resolution

The normal digital oscilloscope in the market integrates 8-bits ADC. Every

waveforms are reunited by 256 units of “0” and “1”. We assume that 8 divisions

are the full scale at vertical side, and the quantification level at 256. While the

vertical scale is 500mV/div, the vertical precision will be (500mV x

8)/256=15.625mV. For the same signal, when the vertical scale switch to

50mV/div, that is (50mV x 8)/256=1.5625mV. The vertical precision reaches

1.5625mV.

FAQ

Popular Features of Oscilloscope

It has been around 70 years since Tektronix invented its first digital oscilloscope, and the performance and functionality of low-end digital oscilloscopes have been getting better and better. Now with Chinese oscilloscopes in the market, oscilloscopes with less than 500MHz capability have experienced different stages of development:

1. Larger and More Professional Displays

Early digital oscilloscopes were generally equipped with a 4.5-inch or 5-inch LCD screens and display contents were limited. As early as 2009, OWON first launched a large 8-inch screen oscilloscope in its SDS series of products. This allowed the waveform to display perfectly on the larger and clearer screen and it hit the requirements of engineers at the time.

2. High Sample Rate with Deep Memory and High Waveform Capture Rate

In the early days, digital oscilloscopes under 500MHz had a low storage depth, typically only a few K samples. As the sample rate and record memory are contradictory, when the sample rate is high, the waveform storage capacity reduces. In 2010 the OWON SDS Series introduced a 10M sample memory which provides a 1GS/s sample rate. This was made possible in the SDS series by using a high-performance large-scale FPGA ASIC design with embedded high-performance CPU and RAM which adopts fast segment storage technology.

3. Multi-function Oscilloscopes for Different Test Environments.

Mixed-signal oscilloscopes (MSO) were first introduced by Keysight over a decade ago and the idea was later carried forward by more and more oscilloscope vendors. These oscilloscopes are not only a time domain measurement instrument, but also have extended functions to enable multi-field measurement. By using high-performance microprocessors and ASIC’s, processing can be done on a number of nodes at the same time in the frequency domain, data domain and statistical domain for measurement and analysis. At present the functional classification of the oscilloscope has been very vague; many manufacturers have integrated a signal generator and other basic measurement modules into the oscilloscope system. Take OWON’s XDS oscilloscope for example, its functions include: an oscilloscope, arbitrary waveform signal generator, digital multimeter, data recorder and frequency meter. Module integration also improves the efficiency of data manipulation and analysis..

4. Better ADC and Touchscreen technology

Since LeCroy introduced their 12-bit HBO series oscilloscopes in 2013, many engineers began to focus on vertical accuracy provided by a higher resolution ADC. For example, a 12-bit oscilloscope measurement accuracy is 16 times greater than a normal 8-bit oscilloscope, it can be a great advantage for small voltage signals measurement and analysis of small signal components in large voltage signals.

Since the Apple began using a touch screens in their mobile devices, more and more electronic products began to integrate them. With continuous functional innovations of oscilloscopes, more and more manufacturers began to use a touch screens to replace some of the complex key operations.

From 2016, many well-known international oscilloscope manufacturers have begun to promote high-precision and touch screen products, including Tektronix, RS, Keysight, etc. It is expected that these features will be standard configurations for future oscilloscopes. OWON began to trial touch screen technology on oscilloscopes as early as 2014, and in 2015 officially released their XDS series oscilloscope - the first integrated hardware 12-bit ADC and touch function oscilloscope. The XDS 200M oscilloscope launched in 2017 is equipped with a 14-bit ADC, leading measurement resolution to an even higher level..

In additional to these welcomed features, the XDS series oscilloscopes still maintain OWON’s product characteristics. An optional lithium battery module assures field measurement and the possibility of floating measurements. What’s more, OWON also deeply focuses on education and have set up a wireless educational management system based on XDS’s WiFi module. Through a WiFi connection, this system can achieve a ‘one to all’ experimental project teaching feature, improving class efficiency. OWON continue to innovate to meet the needs of the market, always aiming to stay at the front of the market, ensuring we bring more and more innovative products to a vast number of consumers.

Tips:

Current probe measurement examples and tips

The application of current probe is extensive. The basic principle is that the current flowing through the wire will generate a magnetic field around it. The current probe converts the magnetic field into a corresponding voltage signal. Through the cooperation with the oscilloscope, observe the corresponding current waveform. Widely used in switching power supply, motor driver, electronic rectifier, LED lighting, new energy and other fields. This article will describe the classification, principle, and important technical indicators of common current probes. Through examples, we will understand the differences between probes so that everyone can have a basic understanding of the probes.

1. A current probe is divided into AC current probe and AC/DC current probe.

Current probes on oscilloscopes are basically divided into two types: AC current probes and AC/DC current probes. AC current probes are usually passive probes. They have low cost but cannot handle DC components. AC/DC current probes are usually active. Probes are divided into low-frequency probes and high-frequency probes. The common bandwidth of low-frequency probes is below several hundred KHZ, and the bandwidth of high-frequency probes is generally more than a few MHZ.

2. the important indicators of current probe 

2.1 Accuracy

Accuracy: Refers to the accuracy of current-to-voltage conversion. Taking the AC/DC current embedding as an example, the accuracy of the open-loop system is generally poor, with a typical value of about 3%. The accuracy of the closed-loop system is relatively high, and the typical value is about 1%. The accuracy of our high frequency current probe is 1%.

2.2 Bandwidth

Bandwidth: All probes have bandwidth. The bandwidth of the probe is the frequency at which the probe response causes the output amplitude to drop to 70.7% (-3 DB), as shown in Figure 5. When selecting oscilloscopes and oscilloscope probes, be aware that bandwidth affects measurement accuracy in many ways. In amplitude measurements, the sine wave's amplitude becomes increasingly attenuated as the sine wave frequency approaches the bandwidth limit. At the bandwidth limit, the amplitude of the sine wave is measured as 70.7% of the actual amplitude. Therefore, to achieve maximum amplitude measurement accuracy, you must select an oscilloscope and probe with a bandwidth several times higher than the highest frequency waveform you plan to measure. The same applies to measuring the waveform rise time and fall time.

Waveform transition edges (such as pulses and square wave edges) consist of high frequency components. The bandwidth limit causes these high-frequency components to attenuate, causing the display to switch slower than the actual conversion speed. To accurately measure the rise and fall times, the measurement system used must have sufficient bandwidth to maintain the high frequency components that make up the waveform's rise and fall times. In the most common case, when using the rise time of the measurement system, the rise time of the system should generally be 4-5 times faster than the rise time to be measured. In the field of switching power supplies, a bandwidth of several tens of MHZ is generally sufficient. Our high-frequency current probes have a bandwidth of 5 MHz to 100 MHz.

Specification