USB Type-C and Power Delivery Messaging

Figure 1: Power Delivery messaging comprises two types:
Control and Data

Continuing our review of USB Type-C and the associated Power Delivery 2.0 (PD) specification, let's now turn to PD message types. Whereas USB was originally conceived as primarily a serial-data interface with limited power-delivery capabilities, the proliferation of power-hungry mobile devices has forced a rethinking of that conception. With PD 2.0 came a much more flexible, and capable, power-delivery functionality for USB. PD messaging is a critical component in this regard.

The Evolving User Interface: Cursors, Triggers, and More

Figure 1: Need to reposition a
cursor? Touch, hold, and drag it

In our review of the evolving user interface as embodied in Teledyne LeCroy's MAUI with OneTouch gesture control, we've seen how touch, drag, swipe, pinch, and flick gestures have combined to transform the oscilloscope UI into something that enhances and encourages creativity. Here, we'll cover a few of the remaining features of OneTouch, showing how the concept permeates the MAUI UI in the recently launched WaveRunner 8000 series of instruments.

The Evolving User Interface: Add New

Figure 1: Dragging a channel, memory, math, or zoom trace
to the Add New box creates a new trace of the same type

In our ongoing exploration of the evolving user interface as embodied by Teledyne LeCroy's MAUI - Most Advanced User Interface, we've seen how the addition of OneTouch gesture control and features such as Copy Setup and Change Source have made the touchscreen UI even more powerful, flexible, and intuitive. These features let you get the most out of an oscilloscope's functionality at lightning speed without fussing with menus or dialogs.

The Evolving User Interface: Changing Sources

Figure 1: Changing the source of a trace is as simple as
a drag-and-drop of the desired source's descriptor box onto
the target descriptor box

A truly modern oscilloscope user interface should lend itself to free-form experimentation in the interest of design and debug. Impulses to "try something" are at the core of creativity; you never want your test bench to stifle them. It should stay out of your way and not force you to stop and think about how to interact with the oscilloscope to make "something" happen. That's what Teledyne LeCroy has achieved by augmenting its MAUI - Most Advanced User Interface with OneTouch gesture control, a set of drag-and-drop actions that bring even more intuitiveness and flexibility to oscilloscopes' touchscreens (we covered another feature, Copy Setup, in an earlier post).

The Evolving Oscilloscope User Interface

Figure 1: MAUI is Teledyne LeCroy's
intuitive touch-based user interface

The means of interaction with test equipment has steadily evolved and improved over the years. Concepts such as remote control, for instance, broadened the possibilities for users of oscilloscopes and other equipment. Advancing display technology brought helpful elements such as color coding of traces, while more powerful graphics processing and computing gave us multiple grids, and so on.

The Challenges of GFCI Measurements

Figure 1: An example
of a GFCI

The ubiquitous ground fault circuit interrupter (GFCI), a fast-acting circuit breaker, has saved countless individuals from serious injury or death when they've inadvertently entered the low-resistance ground path of an electrical device or outlet. It's important to measure precisely the amount of time that elapses from when the 60-Hz cycle is present to when the GFCI disables the ground path. Other tests include determining the start, stop, and duration of the GFCI's tripping time. Let's take a look at the challenges these measurements present.

Performance Considerations For Optical Modulation Analysis

Figure 1: Error-vector magnitude defined

In recent posts, we've covered the fundamentals of coherent signals and the basics of optical modulation analyzers. Let's now turn to the operational parameters of OMAs, in particular system bandwidth, and how that figure of merit in an OMA can determine how far your measurement system can take you in terms of meaningful analysis.