When operating in the state mode, the timing of clocks is determined by the circuit under test. Sometimes the clocking is sporadic, or store qualification is engaged, which obliterates any implied timing from a regularly paced state clock. The ability of a logic analyzer to store a time value along with the captured data can be very useful. The stored time value is called a “time stamp.” The time stamp is especially useful with an instrument split into state and timing machines. It enables the user to correlate the state and timing measurements. Modular instruments that can host multiple logic analyzers or other measurement modules, such as pattern generators or oscilloscopes, sometimes are able to time stamp and correlate events from each of the modules.
Time stamps
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In manual benchtop applications, careful consideration of the instrument’s size, form factor, and human interface is needed. Instrument displays with poor viewing angles or small digits and measurement unit labels can cause confusion for the user. Simple-to-use, clearly marked controls help the user to quickly gather measurement data. Instruments which require the user to remember the right “trick” to access a function or mode can cause wasted time and frustration especially when an instrument is shared by several users. Features such as built-in math operations can simplify repetitive measurements and reduce the chance of accidental errors. Don’t forget to consider such mundane aspects as size, weight, and availability of a handle for easy movement whenever the instrument will be shared by several users. Safety features such as maximum input ratings, isolation voltages, safety terminals, and active user warnings can be critical in applications involving power-line voltages or greater many times these features aren’t even considered before the purchase decision has been made.
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The measurements that are made can be accumulated into histogram form to examine the statistical distribution of some phenomenon. In order for this to be effective for many applications, a large number of measurements need to be accumulated. Measurement rate, maximum measurements per bin, and the number of bins are important specifications. Whether the analyzer handles the histogram through software or hardware affects some of these parameters. If the measurements are accumulated through software, the measurement rate is orders of magnitude slower than if performed via hardware.
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The oscilloscope display is traditionally subdivided by a grid of horizontal and vertical lines, called a “graticule,” to aid the operator in making measurements, voltage or time, on the signals displayed on the screen. There are 10 major divisions horizontally, the time axis. In the vertical, or voltage, direction, there are between 4 and 10 divisions. The graticule is sometimes scribed on a sheet of transparent material which is then placed over the phosphor screen, and the operator views the signal trace through the grid. This method has the disadvantage of introducing errors due to parallax, because the plane containing the graticule is not coincident with the plane containing the signal trace, and the user’s eye position while making the measurement becomes an important factor. Alternatively, the graticule can be etched on the inside surface of the glass face plate of the CRT during its manufacture. Then the phosphor material is placed in contact with the plane of the graticule, minimizing distortion from parallax in the resulting oscilloscope display. A third method is to use the electron beam of the CRT to “draw” the graticule by illuminating lines in the phosphor screen.
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