Pololu USB AVR User Manual

Page 48

by hovering over it with your cursor. A purple rectangle highlights the portion of the upper pane is visible in the lower
pane.

You can adjust the vertical scaling of a channel’s data by changing its volts-per-division parameter, and you can adjust
the amount of data that is shown in the lower pane by changing the SLO-scope’s milliseconds-per-division (horizontal
scale) parameter.

Triggering can be used when horizontal scaling is 20 ms/div or less. You can trigger on rising or falling edges of either
channel A or channel B, and you can adjust the trigger level by directly setting the value in millivolts or by dragging
the trigger level scrollbar on the right side of the lower pane to the desired position. When triggering is enabled, the
data in the lower pane will update whenever a trigger event occurs. Triggering can help you to better identify and
analyze periodic signals (such as motor noise, PWMs, etc.) while the SLO-scope is running.

To change the color used to draw a channel’s data, double click on the colored square in either the Channel A or
Channel B box.

To change the vertical position of the 0V level of a channel, click and drag that channel’s corresponding 0V-indicator
triangle on the left side of the lower pane.

While the SLO-scope is running, lines A and B do not function as serial handshaking lines as discussed in

Section

6.a

. Rather, the SLO-scope can control the I/O states of A and B. The SLO-scope application lets you configure these

pins as inputs (their default settings when you first enable the SLO-scope) or as digital outputs driven high or low.

Pololu USB AVR Programmer User's Guide

7. Measuring Voltages Using the SLO-scope

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