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A measurement taken in the software does not appear to be correct.

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This is either a bug in the measurement code in the Saleae software, or the measurement is not configured properly.

The software has four main types of measurements:

  • Instantaneous digital measurement When you move the mouse over a digital channel, this is the measurement that actively follows the mouse
  • Instantaneous analog measurement When you move the mouse over an analog channel, this is the measurement that actively follows the mouse
  • Persistent digital measurement annotation When you add a measurement from the annotations panel, or by pressing the M key, and place the measurement on a digital channel, this type of measurement is used.
  • Persistent analog measurement annotation When you add a measurement from the annotations panel, or by pressing the M key, and place the measurement on an analog channel, this type of measurement is used.

Each type of measurement has a number of possible calculations that can be enabled or disabled. Many of these calculations are shared between measurement types.

If you believe a measurement calculation is wrong, it's possible that the wrong measurement calculation is active. Some measurement calculations don't make as much sense in some cases, unfortunately, which we are working on correcting.

Please report any suspected issues to support. Include a screenshot and a copy of the saved capture so we can open it up over here in the debugger to see what's happening.

Common issues

  • Width vs Period. The definition of these calculations is different for instantaneous measurements and persistent measurements. For instantaneous measurements, the width takes the region under the mouse cursor and finds the nearest transitions on either side. That distance is the width result. The period result takes that width and adds to it the width of the next region to the right of the mouse cursor. For the persistent measurement, Width and period just become the time between the start of the measurement and the end of the measurement, and don't have much value. For persistent measurements, please take a look at the minimum, maximum and average measurements, which will analyze each cycle within the measurement instead.
  • Period vanishes sometimes for the instantaneous measurement sometimes when the pulse to the right of the pulse under the mouse is too narrow to see. In these cases, since it's not visually distinct enough for the user to notice the second pulse, the measurement shuts down all computations based on the second pulse. To get these measurements back, just zoom in until you can see the next pulse.

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