Keysight 4000 X-Series, Руководство по продвинутой подготовке

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120 4000 X-Series Oscilloscopes Advanced Training Guide
4
Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs
19
Tap the Bus Config softkey; then verify that Word Size is set to “8”, Receiver is set
to “8”, Alignment is set to “Standard I
2
S”, WS Low is set to “Left channel”, SCLK
Slope is set “rising edge”.
20
Use your finger to drag the data signals to match the order on the screen's help
image by dragging the digital channel identifiers on the far left of the display.
Your scope should now be decoding the left-channel and right-channel audio data
similar to Figure 80 . However, the scope is not yet triggering on these signals. The
scope should be randomly auto triggering because the default trigger condition is
to trigger on a rising edge of channel-1. But there are no signals present on the
channel-1 input. Let’s now set up the scope to trigger on I
2
S right-channel audio
data as the value of the data increases from
≤
-10 to
≥
+10 (signed decimal
format).
21
Press the
[Trigger]
front panel key; then select Serial 1 (I 2 S) using the Trigger Type
menu.
22
Tap the Audio Left softkey; then change to Right .
23
Tap the Trigger = softkey; then set it to Increasing value.
24
Press the
[Mode/Coupling]
key in the Trigger section of the front panel; then
select the Normal trigger mode.
Figure 80 Decoding I
2
S signals.