Take Digital Measurements - Parallax PropScope Manual

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Part III: Using the PropScope

3.2 Take Digital Measurements

To take digital measurements you'll need to connect the DAC/LSA card to the PropScope. The 5
pin header furthest away from the PropScope is used to measure digital signals. Connect your
signals and start the PropScope software.
Click on the "Logic Analyzer" tab and then turn the timescale knob to a timescale that suits your
signal.
You can choose two different trigger modes to stabilize your signal. Click on "Bit" to trigger on
the rising or falling edge of a single bit. In this mode, clicking to the left of a bit's label will select
between "rise, fall, none" trigger conditions for that bit. To set up more complex trigger conditions
(like in the graph below), switch to "Pattern" mode. Here, you can select between "rise, fall, 1, 0,
none" trigger conditions for every bit.
The PropScope can measure before and after the trigger condition, so use the top scroller or drag
the traces left/right to view the part of the signal you're interested in.
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