Check out how to build a high speed oscilloscope probe that measures 125MHz signals better than commercial probes. Paulo Oliveira writes: [via]
Some years ago, I learned some valuable lessons about probing high-speed signals. Somehow, mistakes have a way to sticking in your mind and we call them “experience”. Most modern oscilloscopes come with a “high-bandwidth” 10X passive probe. Figure 1 shows the venerable Tektronix P6139, 500 MHz, 8pF probe. At first glance, a “500 MHz probe” might seem adequate to probe say, a 125 MHz clock signal right? Wrong… We will see why with a practical example showing the issues you run into when trying to probe such a signal. Later in the article, I’ll also show how a surprisingly simple and affordable DIY passive probe can outperform even the best 10X passive probes for this particular application.
Homebrew highspeed lo-Z scope probe – [Link]
Entry-level signal generation often equals limited functionality and flexibility. The new AFG2021 arbitrary/function generator from Tektronix however changes that equation with features including 20 MHz bandwidth, 14-bit resolution, 250 MS/s sample rate and an intuitive user interface. A PC software tool lets users create and import waveforms into the instrument to meet custom stimulus requirements. A 3.5 inch color TFT screen shows relevant parameters in both graphic and text formats. The generator includes 12 standard waveforms, modulation capability, and a built-in noise generator to thoroughly exercise designs.
The generator is targeted at cost-sensitive education and manufacturing applications but also offers the versatility to meet many R&D requirements. As a result educators are no longer forced to choose a signal generator that can only be used in entry level classes. The AFG2021′s performance supports development of advanced course material involving more complex concepts such as serial data streams and modulated waveforms. [via]
Arbitrary/Function Generator Creates Complex Signals at Entry-Level Price - [Link]
How do you detect the actual current from your 22,500uF, 450VDC capacitor bank when you pulse discharge it? Well Norman from Procrastinatus shows us his method. Inductive Current Sensing is done using a Rogowski coil which is wrapped around the high current output of the capacitor bank. A DSO is used to capture the data so the short event can be analyzed. Norman entered this into the Tektronix scope competition so if you like it please vote for him.
Inductive Current Sensing - [Link]
Tektronix recently launched the TDS1000C-EDU series of digital oscilloscopes, which are designed for first-time oscilloscope users and students and aim to put a digital scope in every school lab. The new models comes with an Education Resource CD to help students master oscilloscope use.
The TDS1000C-EDU series include 40-, 60- and 100-MHz models specifically designed for the unique needs of education. They provide digital real-time sampling on all channels, allowing students to accurately characterize a wide range of signal types simultaneously. Flexible triggering options such as edge trigger, pulse width trigger and line selectable triggering let students quickly capture desired waveforms. [via]
Tektronix launches educational scope series – [Link]