标签: mso

Tektronix 4 系列 M S O 混合 信号 示波器 超大的显示屏以及屡获殊荣的用户界面 ： 4 系列 MSO 采用与屡获殊荣的 5 系列相同的触摸式用户界面技术，以及同类产品中超大的显示和超高分辨率的显示，打造了示波器全新的操作体验。 出色的细节设计和多达 6 条Flex channel的输入通道 ：任何通道都可以显示波形、频谱 ； 任何一条输入通道都可连接逻辑探头来查看八条数字通道 ； 所有通道均具备出色的细节设计和准确的测量 ； 在所有模拟和数字通道上实时采样率高达 6.25 GS/s 。 应用场景： 嵌入式串行总线分析 、电源轨测量、 电源测量和分析 、应用 汽车 ECU 设计 、 电磁干扰 (EMI) 故障排除 4 系列 M S O 混合 信号 示波器 型号： 型号 模拟带宽 模拟通道 数字通道 采样率 记录长度 MSO44 200 MHz 至 1.5 GHz 4 最多 32 条（可选） 6.25GS/s 31.25 M 至 62.5 M 点 MSO46 200 MHz 至 1.5 GHz 6 最多 48 条（可选） 6.25GS/s 31.25 M 至 62.5 M 点 其他参数： 垂直分辨率 ： 12 位 高分辨率模式下高达 16 位 信号生成 ： 任意波形、正弦波、方波、脉冲、斜坡、三角波、 DC 电平、高斯、洛伦兹、指数上升/下降、Sin(x)/x、随机噪声、半正矢、Cardiac 数字电压表 ： 4 位交流有效值电压，直流电压 直流 + 交流有效值电压 触发频率计数器 ： 8 位 公司名称：西安安泰测试设备有限公司 公司地址：西安市高新区高新四路 17号志诚商务C207 公司电话： 029-88353093 公司网址： www.agitek.com.cn

        示波器，逻辑分析仪，都是最通用的测试仪器之一，尤其是示波器，通过参看信号的电压幅度，脉冲宽度，上升时间等关键参数，来找到信号的问题，是电子工程师必备的测试工具。但是如果面对多路数字信号的调试，示波器就受制于通道数的不足，所以对于嵌入式工程师而言，在分析多路时序、软件调试时，逻辑分析仪又是必不可少的调试利器。长久以来，工程师在使用示波器和逻辑分析仪时，都是把它们作为单台仪器来使用，孰不知逻辑分析仪和示波器可以组合起来使用，而且在某些时候可以发挥1+12的效果，本文就将探讨何时需要使用逻辑分析仪和示波器进行组合调试？要实现逻辑分析仪和示波器组合调试时面临的最大困难是什么？ 我们先来看一张逻辑分析仪的测试图片：          在光标A-B 之间蓝色波形出现了异常情况，但是逻辑分析仪只能显示时间的信息，缺少对整个信号的信息评估，如果这时能加入示波器对这路信号的观测，对于工程师来说可能就会如虎添翼。   那么接下面请再看一张加入了示波器波形的测试图片：         在这张图片中的黄色波形就是示波器测试的结果。通过示波器的波形，工程师可以很清楚的看到信号幅度的变化，发现时钟的问题。会给工程师带来豁然开朗的感觉，那么在这些时候，示波器和逻辑分析仪组合就会发挥出1+12的效果。           从上面的例子我们可以看到在某些时候需要示波器和逻辑分析仪组合调试，那么示波器和逻辑分析仪组合有那些困难呢？ 成本昂贵 一般台式逻辑分析仪动辄10万到20万的价格，再加上示波器的成本，最少都要几十万的预算，所以对于大多数工程师可能是可望而不可及。      同步调试 可能在某些工程师的理解当中，要想实现示波器和逻辑分析仪的组合调试只需要有一台示波器和一台逻辑分析仪就可以了，其实不然， 示波器和逻辑分析仪有着各自的时钟，如果不同步触发，他们看到的信号将不会是一一对应的，就不能实现上面例子中的效果，那么通常情况下都需要购买一个时钟同步线的选件来同步两台仪器。 仪器必须是同一品牌 一般台式逻辑分析仪和示波器组合，还必须保证这两台仪器是同一厂家的产品，通常情况下A公司的示波器是不会支持B公司的逻辑分析仪的，反之亦然。 那么看来示波器和逻辑分析仪组合虽好，但实现起来困难重重，所以我们就此放弃，让它成为极少数人的奢侈品？当然不是，我们已经找到更加物廉价美的方案： 台湾皇晶公司 Acute 的 PC-based TL2036 TL2136及TL2236逻辑分析仪价格仅仅是台式逻辑分析仪的十分之一！不需要额外选购价格不菲的时钟同步线！支持和多家一线品牌的示波器进行组合，无需同一品牌！   Acute 逻辑分析仪与示波器的组合方式。 Acute 逻辑分析仪支持的示波器品牌：   示波器厂牌 机型 USB TCP/IP 皇晶 (Acute) DS-1000 TravelScope √   安捷伦 (Agilent) DSO5000A/DSO6000A/6000L/7000A MSO6000A/7000A DSO-X 3000A /MSO-X 3000A DSO-X 2000A/MSO-X 2000A √ √ 固纬 (GwInstek) GDS1000A/2000/3000 √   力科 ( LeCroy ) WaveRunner / WaveSurfer   √ 泰克 (Tektronix) TPS2000 TDS1000/1000B/2000/2000B/3000/3000B/3000C/5000B DPO2000/3000/4000/4000B/5000/7000 MSO2000/3000/4000/4000B/5000 MDO4000 √ √     深圳市千兆科科技有限公司 0755-23062736 www.giga-science.com

示波器，逻辑分析仪，都是最通用的测试仪器之一，尤其是示波器，通过参看信号的电压幅度，脉冲宽度，上升时间等关键参数，来找到信号的问题，是电子工程师必备的测试工具。但是如果面对多路数字信号的调试，示波器就受制于通道数的不足，所以对于嵌入式工程师而言，在分析多路时序、软件调试时，逻辑分析仪又是必不可少的调试利器。长久以来，工程师在使用示波器和逻辑分析仪时，都是把它们作为单台仪器来使用，孰不知逻辑分析仪和示波器可以组合起来使用，而且在某些时候可以发挥1+12的效果，本文就将探讨何时需要使用逻辑分析仪和示波器进行组合调试？要实现逻辑分析仪和示波器组合调试时面临的最大困难是什么？ 我们先来看一张逻辑分析仪的测试图片：          在光标A-B 之间蓝色波形出现了异常情况，但是逻辑分析仪只能显示时间的信息，缺少对整个信号的信息评估，如果这时能加入示波器对这路信号的观测，对于工程师来说可能就会如虎添翼。   那么接下面请再看一张加入了示波器波形的测试图片：         在这张图片中的黄色波形就是示波器测试的结果。通过示波器的波形，工程师可以很清楚的看到信号幅度的变化，发现时钟的问题。会给工程师带来豁然开朗的感觉，那么在这些时候，示波器和逻辑分析仪组合就会发挥出1+12的效果。           从上面的例子我们可以看到在某些时候需要示波器和逻辑分析仪组合调试，那么示波器和逻辑分析仪组合有那些困难呢？ 成本昂贵 一般台式逻辑分析仪动辄10万到20万的价格，再加上示波器的成本，最少都要几十万的预算，所以对于大多数工程师可能是可望而不可及。      同步调试 可能在某些工程师的理解当中，要想实现示波器和逻辑分析仪的组合调试只需要有一台示波器和一台逻辑分析仪就可以了，其实不然， 示波器和逻辑分析仪有着各自的时钟，如果不同步触发，他们看到的信号将不会是一一对应的，就不能实现上面例子中的效果，那么通常情况下都需要购买一个时钟同步线的选件来同步两台仪器。 仪器必须是同一品牌 一般台式逻辑分析仪和示波器组合，还必须保证这两台仪器是同一厂家的产品，通常情况下A公司的示波器是不会支持B公司的逻辑分析仪的，反之亦然。 那么看来示波器和逻辑分析仪组合虽好，但实现起来困难重重，所以我们就此放弃，让它成为极少数人的奢侈品？当然不是，我们已经找到更加物廉价美的方案： 台湾皇晶公司 Acute 的 PC-based 逻辑分析仪价格仅仅是台式逻辑分析仪的十分之一！不需要额外选购价格不菲的时钟同步线！支持和多家一线品牌的示波器进行组合，无需同一品牌！   Acute 逻辑分析仪与示波器的组合方式。 Acute 逻辑分析仪支持的示波器品牌：     示波器厂牌 机型 USB TCP/IP 皇晶 (Acute) DS-1000 TravelScope √   安捷伦 (Agilent) DSO5000A/DSO6000A/6000L/7000A MSO6000A/7000A DSO-X 3000A /MSO-X 3000A DSO-X 2000A/MSO-X 2000A √ √ 固纬 (GwInstek) GDS1000A/2000/3000 √   力科 ( LeCroy ) WaveRunner / WaveSurfer   √ 泰克 (Tektronix) TPS2000 TDS1000/1000B/2000/2000B/3000/3000B/3000C/5000B DPO2000/3000/4000/4000B/5000/7000 MSO2000/3000/4000/4000B/5000 MDO4000 √ √    

What is a pHz? According to Wikipedia, pHz stands for "picohertz," or 10-12Hz. fHz is "femptohertz"—three orders of magnitude smaller. A 1-fHz signal would take about 20 million years to complete a single cycle. Four cycles ago, dinosaurs roamed the Earth. When confronted with a new oscilloscope, the first thing I do is connect a probe to the calibration node and look at the resulting square wave. I tried this with the new MSO-X 3054A from Agilent Technologies and then pressed "Measure." The display showed the expected waveform, with current, mean, min, and max frequencies, all at 1.0012kHz. But it also showed the standard deviation as a few tens of fHz, and later pHz, prompting my dive into Wikipedia. The same sense of surprise dogged me for most of my evaluation of this product, which was a meta-surprise in itself. I don't expect much novelty in looking at scopes anymore. Until the advent of digital versions, the technology evolved very slowly. A World War II version wouldn't be much different, other than bandwidth, than one from the 1980s. Fifteen years ago HP startled me with their 54645D MSO—Mixed Signal Oscilloscope—which combined both a logic analyzer and a scope in one package. The brilliance of this device was its cross-triggering: it could start a sweep either on a combination of logic conditions or on a normal scope-like analog threshold crossing. Suddenly we embedded types could see how our digital circuits interacted with the analog components. A new day had dawned for debugging embedded systems. Later HP spun off their test equipment division into Agilent, a move that always puzzled me, since that group represented both the origins of the company as well as its finest engineering. But perhaps that was for the best since Agilent was spared the slings and arrows of Carly. First, let's get the boring part out the way. Agilent's new 2000X and 3000X line of digital scopes comprises, by my count, 26 models that cover the needs of most of us embedded systems engineers. At the bottom is a 70MHz 2-GSa/s (gigaasamples per second per channel) twin-channel model with 100k-deep storage costs just over $1,200; the top of the line MSOX3054A that startled me has seven times the bandwidth for about nine times the cost, with 4 GSa/s, four analog channels, 16 digital, and a 2 million sample deep buffer (4 million available). Options for all models abound, which can drive the cost up a bit while greatly increasing the functionality. The screen updates up to a million waveforms/second on the screen. A demo dramatically shows how a slower rate masks glitches. And in using the scopes, I consistently found them to be extremely fast, except when computing an FFT (fast Fourier transform). USB, GPIB, and Ethernet connectivity are available on the scopes, of course, but the Ethernet is LXI-compliant. LXI (LAN eXtensions for Instrumentation) is a standard aimed at the test and measurement world that specifies what kinds of capability, accessible via a standard LAN, is available in the instrument. For instance, it defines standards for triggering. If you have two instruments at opposite sides of, say, an airplane, the LXI standard ensures you can trigger both devices from the same signal. In the olden days, scopes had three basic bits of functionality: a vertical amplifier, time base, and triggering, all controlled by a sea of knobs and buttons. It took a lot of electronics to provide those features, so packages were quite large, yielding plenty of panel space for the controls. Tiny displays freed up even more space. No longer: These models occupy less than half a cubic foot and nearly half the panel is devoted to an enormous (8.5-inch (convert to mm except for displays) WVGA) screen. Like many other scopes today, soft keys are used to control many of the vast array of features, although all basic scope functionality has dedicated controls. Surprises! Agilent sent me two scopes representative of the bottom of the line (the DSO-X 2002A) and the top (MSO-X 3054A), which have identical form factors and look and feel. Both scopes came with all available options, which initially caused me some confusion and then delighted surprise. At first I couldn't find that 1kHz calibration square wave. These instruments have two scope compenzation lugs instead of the usual one, and somehow, due to excessive button pushing (who can resist all of those seductive knobs?), I'd enabled training mode. That generates one of a large variety of signals on these lugs ranging from a simple sine wave to RF bursts, runt pulses, and even streams of serial data like CAN and I2C. Training mode is targeted to the educational market and is accompanied by a quite large book that takes students from the basics of using an oscilloscope to quite advanced techniques. But at $500, I'd recommend buying the option even if you're an old pro. We've always used that 1kHz square wave to, among other things, provide a sanity check that the unit was set up properly. These scopes offer so much analysis capability that a similar sanity check is just as essential. Long ago, I worked with an engineer who had applied for a job at Cape Canaveral. He told me that he was given a tour of Cape Canaveral after his interview. The tour ended back at a panel of beautiful controls just crying out for some tactile interaction. A big bundle of wires trailing on the floor was cut, proving the box wasn't connected to anything, and my friend finally succumbed and twisted a knob. Klaxons suddenly blared all over the blockhouse! The panel was a test; management didn't want to hire someone who pressed buttons in a launch complex. He didn't get the job. I was pretty sure the MSO-X 3054A wasn't connected to a firing circuit, so pressed, twisted, and pushed to put the unit through its paces. Next surprise: All of the rotating knobs can be pushed in as well as twisted. Press a vertical or horizontal positioning control and the display returns to the zero position. A similar action on the trigger knob sets the trigger threshold to the signal's 50% level. For generations, vertical and horizontal controls operated in steps of 1, 2, and 5. The first position might be 1µsec/division, the next 2µsec/div, then 5, repeating at 10, 20, and 50. That's true on these scopes as well. But press the vertical or horizontal knobs and the devices switch to a "fine" mode where the detents select variable steps. For instance, at 100µsec/div this mode now clicks in 2µsec increments, letting one finely control how much of the waveform is shown on the screen. Another quick press and it returns to 1, 2, 5 steps. I got these scopes before their official introduction and presumably the instruction manual had not been complete, as none was included in the package. These are complex products and I was initially disappointed they had no manuals, but the next surprise mitigated my frustration. Hold any button in for two seconds and the screen shows pretty complete help information for that control. And this includes the soft keys. Triggering works as you'd expect, until you start pushing more buttons. It was no surprise that the unit can trigger off of a particular I2C or CAN packet; that's hardly unusual on an instrument with built-in protocol analyzer. But it's an essential feature for working with serial datastreams. The scope's ability to trigger on a variety of runt pulses, too, was expected and very welcome. But Agilent has taken the integration of analog and digital channels a step further. Sure, you can trigger on data patterns from the 16 digital inputs, but even with that entire section of the instrument turned off, the logic analyzer-like triggering features still exist. With just a few button presses one can start a sweep based on a rise/fall time being greater or less than a user-set value. Similarly, the units can trigger on specific pulse widths, programmable from 2 nsec to 10 seconds.